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Merge branch 'samsung/pinctrl' into next/drivers
[deliverable/linux.git] / drivers / gpu / drm / i915 / intel_pm.c
1 /*
2 * Copyright © 2012 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 *
23 * Authors:
24 * Eugeni Dodonov <eugeni.dodonov@intel.com>
25 *
26 */
27
28 #include <linux/cpufreq.h>
29 #include "i915_drv.h"
30 #include "intel_drv.h"
31 #include "../../../platform/x86/intel_ips.h"
32 #include <linux/module.h>
33
34 /* FBC, or Frame Buffer Compression, is a technique employed to compress the
35 * framebuffer contents in-memory, aiming at reducing the required bandwidth
36 * during in-memory transfers and, therefore, reduce the power packet.
37 *
38 * The benefits of FBC are mostly visible with solid backgrounds and
39 * variation-less patterns.
40 *
41 * FBC-related functionality can be enabled by the means of the
42 * i915.i915_enable_fbc parameter
43 */
44
45 static void i8xx_disable_fbc(struct drm_device *dev)
46 {
47 struct drm_i915_private *dev_priv = dev->dev_private;
48 u32 fbc_ctl;
49
50 /* Disable compression */
51 fbc_ctl = I915_READ(FBC_CONTROL);
52 if ((fbc_ctl & FBC_CTL_EN) == 0)
53 return;
54
55 fbc_ctl &= ~FBC_CTL_EN;
56 I915_WRITE(FBC_CONTROL, fbc_ctl);
57
58 /* Wait for compressing bit to clear */
59 if (wait_for((I915_READ(FBC_STATUS) & FBC_STAT_COMPRESSING) == 0, 10)) {
60 DRM_DEBUG_KMS("FBC idle timed out\n");
61 return;
62 }
63
64 DRM_DEBUG_KMS("disabled FBC\n");
65 }
66
67 static void i8xx_enable_fbc(struct drm_crtc *crtc, unsigned long interval)
68 {
69 struct drm_device *dev = crtc->dev;
70 struct drm_i915_private *dev_priv = dev->dev_private;
71 struct drm_framebuffer *fb = crtc->fb;
72 struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);
73 struct drm_i915_gem_object *obj = intel_fb->obj;
74 struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
75 int cfb_pitch;
76 int plane, i;
77 u32 fbc_ctl, fbc_ctl2;
78
79 cfb_pitch = dev_priv->cfb_size / FBC_LL_SIZE;
80 if (fb->pitches[0] < cfb_pitch)
81 cfb_pitch = fb->pitches[0];
82
83 /* FBC_CTL wants 64B units */
84 cfb_pitch = (cfb_pitch / 64) - 1;
85 plane = intel_crtc->plane == 0 ? FBC_CTL_PLANEA : FBC_CTL_PLANEB;
86
87 /* Clear old tags */
88 for (i = 0; i < (FBC_LL_SIZE / 32) + 1; i++)
89 I915_WRITE(FBC_TAG + (i * 4), 0);
90
91 /* Set it up... */
92 fbc_ctl2 = FBC_CTL_FENCE_DBL | FBC_CTL_IDLE_IMM | FBC_CTL_CPU_FENCE;
93 fbc_ctl2 |= plane;
94 I915_WRITE(FBC_CONTROL2, fbc_ctl2);
95 I915_WRITE(FBC_FENCE_OFF, crtc->y);
96
97 /* enable it... */
98 fbc_ctl = FBC_CTL_EN | FBC_CTL_PERIODIC;
99 if (IS_I945GM(dev))
100 fbc_ctl |= FBC_CTL_C3_IDLE; /* 945 needs special SR handling */
101 fbc_ctl |= (cfb_pitch & 0xff) << FBC_CTL_STRIDE_SHIFT;
102 fbc_ctl |= (interval & 0x2fff) << FBC_CTL_INTERVAL_SHIFT;
103 fbc_ctl |= obj->fence_reg;
104 I915_WRITE(FBC_CONTROL, fbc_ctl);
105
106 DRM_DEBUG_KMS("enabled FBC, pitch %d, yoff %d, plane %d, ",
107 cfb_pitch, crtc->y, intel_crtc->plane);
108 }
109
110 static bool i8xx_fbc_enabled(struct drm_device *dev)
111 {
112 struct drm_i915_private *dev_priv = dev->dev_private;
113
114 return I915_READ(FBC_CONTROL) & FBC_CTL_EN;
115 }
116
117 static void g4x_enable_fbc(struct drm_crtc *crtc, unsigned long interval)
118 {
119 struct drm_device *dev = crtc->dev;
120 struct drm_i915_private *dev_priv = dev->dev_private;
121 struct drm_framebuffer *fb = crtc->fb;
122 struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);
123 struct drm_i915_gem_object *obj = intel_fb->obj;
124 struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
125 int plane = intel_crtc->plane == 0 ? DPFC_CTL_PLANEA : DPFC_CTL_PLANEB;
126 unsigned long stall_watermark = 200;
127 u32 dpfc_ctl;
128
129 dpfc_ctl = plane | DPFC_SR_EN | DPFC_CTL_LIMIT_1X;
130 dpfc_ctl |= DPFC_CTL_FENCE_EN | obj->fence_reg;
131 I915_WRITE(DPFC_CHICKEN, DPFC_HT_MODIFY);
132
133 I915_WRITE(DPFC_RECOMP_CTL, DPFC_RECOMP_STALL_EN |
134 (stall_watermark << DPFC_RECOMP_STALL_WM_SHIFT) |
135 (interval << DPFC_RECOMP_TIMER_COUNT_SHIFT));
136 I915_WRITE(DPFC_FENCE_YOFF, crtc->y);
137
138 /* enable it... */
139 I915_WRITE(DPFC_CONTROL, I915_READ(DPFC_CONTROL) | DPFC_CTL_EN);
140
141 DRM_DEBUG_KMS("enabled fbc on plane %d\n", intel_crtc->plane);
142 }
143
144 static void g4x_disable_fbc(struct drm_device *dev)
145 {
146 struct drm_i915_private *dev_priv = dev->dev_private;
147 u32 dpfc_ctl;
148
149 /* Disable compression */
150 dpfc_ctl = I915_READ(DPFC_CONTROL);
151 if (dpfc_ctl & DPFC_CTL_EN) {
152 dpfc_ctl &= ~DPFC_CTL_EN;
153 I915_WRITE(DPFC_CONTROL, dpfc_ctl);
154
155 DRM_DEBUG_KMS("disabled FBC\n");
156 }
157 }
158
159 static bool g4x_fbc_enabled(struct drm_device *dev)
160 {
161 struct drm_i915_private *dev_priv = dev->dev_private;
162
163 return I915_READ(DPFC_CONTROL) & DPFC_CTL_EN;
164 }
165
166 static void sandybridge_blit_fbc_update(struct drm_device *dev)
167 {
168 struct drm_i915_private *dev_priv = dev->dev_private;
169 u32 blt_ecoskpd;
170
171 /* Make sure blitter notifies FBC of writes */
172 gen6_gt_force_wake_get(dev_priv);
173 blt_ecoskpd = I915_READ(GEN6_BLITTER_ECOSKPD);
174 blt_ecoskpd |= GEN6_BLITTER_FBC_NOTIFY <<
175 GEN6_BLITTER_LOCK_SHIFT;
176 I915_WRITE(GEN6_BLITTER_ECOSKPD, blt_ecoskpd);
177 blt_ecoskpd |= GEN6_BLITTER_FBC_NOTIFY;
178 I915_WRITE(GEN6_BLITTER_ECOSKPD, blt_ecoskpd);
179 blt_ecoskpd &= ~(GEN6_BLITTER_FBC_NOTIFY <<
180 GEN6_BLITTER_LOCK_SHIFT);
181 I915_WRITE(GEN6_BLITTER_ECOSKPD, blt_ecoskpd);
182 POSTING_READ(GEN6_BLITTER_ECOSKPD);
183 gen6_gt_force_wake_put(dev_priv);
184 }
185
186 static void ironlake_enable_fbc(struct drm_crtc *crtc, unsigned long interval)
187 {
188 struct drm_device *dev = crtc->dev;
189 struct drm_i915_private *dev_priv = dev->dev_private;
190 struct drm_framebuffer *fb = crtc->fb;
191 struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);
192 struct drm_i915_gem_object *obj = intel_fb->obj;
193 struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
194 int plane = intel_crtc->plane == 0 ? DPFC_CTL_PLANEA : DPFC_CTL_PLANEB;
195 unsigned long stall_watermark = 200;
196 u32 dpfc_ctl;
197
198 dpfc_ctl = I915_READ(ILK_DPFC_CONTROL);
199 dpfc_ctl &= DPFC_RESERVED;
200 dpfc_ctl |= (plane | DPFC_CTL_LIMIT_1X);
201 /* Set persistent mode for front-buffer rendering, ala X. */
202 dpfc_ctl |= DPFC_CTL_PERSISTENT_MODE;
203 dpfc_ctl |= (DPFC_CTL_FENCE_EN | obj->fence_reg);
204 I915_WRITE(ILK_DPFC_CHICKEN, DPFC_HT_MODIFY);
205
206 I915_WRITE(ILK_DPFC_RECOMP_CTL, DPFC_RECOMP_STALL_EN |
207 (stall_watermark << DPFC_RECOMP_STALL_WM_SHIFT) |
208 (interval << DPFC_RECOMP_TIMER_COUNT_SHIFT));
209 I915_WRITE(ILK_DPFC_FENCE_YOFF, crtc->y);
210 I915_WRITE(ILK_FBC_RT_BASE, obj->gtt_offset | ILK_FBC_RT_VALID);
211 /* enable it... */
212 I915_WRITE(ILK_DPFC_CONTROL, dpfc_ctl | DPFC_CTL_EN);
213
214 if (IS_GEN6(dev)) {
215 I915_WRITE(SNB_DPFC_CTL_SA,
216 SNB_CPU_FENCE_ENABLE | obj->fence_reg);
217 I915_WRITE(DPFC_CPU_FENCE_OFFSET, crtc->y);
218 sandybridge_blit_fbc_update(dev);
219 }
220
221 DRM_DEBUG_KMS("enabled fbc on plane %d\n", intel_crtc->plane);
222 }
223
224 static void ironlake_disable_fbc(struct drm_device *dev)
225 {
226 struct drm_i915_private *dev_priv = dev->dev_private;
227 u32 dpfc_ctl;
228
229 /* Disable compression */
230 dpfc_ctl = I915_READ(ILK_DPFC_CONTROL);
231 if (dpfc_ctl & DPFC_CTL_EN) {
232 dpfc_ctl &= ~DPFC_CTL_EN;
233 I915_WRITE(ILK_DPFC_CONTROL, dpfc_ctl);
234
235 DRM_DEBUG_KMS("disabled FBC\n");
236 }
237 }
238
239 static bool ironlake_fbc_enabled(struct drm_device *dev)
240 {
241 struct drm_i915_private *dev_priv = dev->dev_private;
242
243 return I915_READ(ILK_DPFC_CONTROL) & DPFC_CTL_EN;
244 }
245
246 bool intel_fbc_enabled(struct drm_device *dev)
247 {
248 struct drm_i915_private *dev_priv = dev->dev_private;
249
250 if (!dev_priv->display.fbc_enabled)
251 return false;
252
253 return dev_priv->display.fbc_enabled(dev);
254 }
255
256 static void intel_fbc_work_fn(struct work_struct *__work)
257 {
258 struct intel_fbc_work *work =
259 container_of(to_delayed_work(__work),
260 struct intel_fbc_work, work);
261 struct drm_device *dev = work->crtc->dev;
262 struct drm_i915_private *dev_priv = dev->dev_private;
263
264 mutex_lock(&dev->struct_mutex);
265 if (work == dev_priv->fbc_work) {
266 /* Double check that we haven't switched fb without cancelling
267 * the prior work.
268 */
269 if (work->crtc->fb == work->fb) {
270 dev_priv->display.enable_fbc(work->crtc,
271 work->interval);
272
273 dev_priv->cfb_plane = to_intel_crtc(work->crtc)->plane;
274 dev_priv->cfb_fb = work->crtc->fb->base.id;
275 dev_priv->cfb_y = work->crtc->y;
276 }
277
278 dev_priv->fbc_work = NULL;
279 }
280 mutex_unlock(&dev->struct_mutex);
281
282 kfree(work);
283 }
284
285 static void intel_cancel_fbc_work(struct drm_i915_private *dev_priv)
286 {
287 if (dev_priv->fbc_work == NULL)
288 return;
289
290 DRM_DEBUG_KMS("cancelling pending FBC enable\n");
291
292 /* Synchronisation is provided by struct_mutex and checking of
293 * dev_priv->fbc_work, so we can perform the cancellation
294 * entirely asynchronously.
295 */
296 if (cancel_delayed_work(&dev_priv->fbc_work->work))
297 /* tasklet was killed before being run, clean up */
298 kfree(dev_priv->fbc_work);
299
300 /* Mark the work as no longer wanted so that if it does
301 * wake-up (because the work was already running and waiting
302 * for our mutex), it will discover that is no longer
303 * necessary to run.
304 */
305 dev_priv->fbc_work = NULL;
306 }
307
308 void intel_enable_fbc(struct drm_crtc *crtc, unsigned long interval)
309 {
310 struct intel_fbc_work *work;
311 struct drm_device *dev = crtc->dev;
312 struct drm_i915_private *dev_priv = dev->dev_private;
313
314 if (!dev_priv->display.enable_fbc)
315 return;
316
317 intel_cancel_fbc_work(dev_priv);
318
319 work = kzalloc(sizeof *work, GFP_KERNEL);
320 if (work == NULL) {
321 dev_priv->display.enable_fbc(crtc, interval);
322 return;
323 }
324
325 work->crtc = crtc;
326 work->fb = crtc->fb;
327 work->interval = interval;
328 INIT_DELAYED_WORK(&work->work, intel_fbc_work_fn);
329
330 dev_priv->fbc_work = work;
331
332 DRM_DEBUG_KMS("scheduling delayed FBC enable\n");
333
334 /* Delay the actual enabling to let pageflipping cease and the
335 * display to settle before starting the compression. Note that
336 * this delay also serves a second purpose: it allows for a
337 * vblank to pass after disabling the FBC before we attempt
338 * to modify the control registers.
339 *
340 * A more complicated solution would involve tracking vblanks
341 * following the termination of the page-flipping sequence
342 * and indeed performing the enable as a co-routine and not
343 * waiting synchronously upon the vblank.
344 */
345 schedule_delayed_work(&work->work, msecs_to_jiffies(50));
346 }
347
348 void intel_disable_fbc(struct drm_device *dev)
349 {
350 struct drm_i915_private *dev_priv = dev->dev_private;
351
352 intel_cancel_fbc_work(dev_priv);
353
354 if (!dev_priv->display.disable_fbc)
355 return;
356
357 dev_priv->display.disable_fbc(dev);
358 dev_priv->cfb_plane = -1;
359 }
360
361 /**
362 * intel_update_fbc - enable/disable FBC as needed
363 * @dev: the drm_device
364 *
365 * Set up the framebuffer compression hardware at mode set time. We
366 * enable it if possible:
367 * - plane A only (on pre-965)
368 * - no pixel mulitply/line duplication
369 * - no alpha buffer discard
370 * - no dual wide
371 * - framebuffer <= 2048 in width, 1536 in height
372 *
373 * We can't assume that any compression will take place (worst case),
374 * so the compressed buffer has to be the same size as the uncompressed
375 * one. It also must reside (along with the line length buffer) in
376 * stolen memory.
377 *
378 * We need to enable/disable FBC on a global basis.
379 */
380 void intel_update_fbc(struct drm_device *dev)
381 {
382 struct drm_i915_private *dev_priv = dev->dev_private;
383 struct drm_crtc *crtc = NULL, *tmp_crtc;
384 struct intel_crtc *intel_crtc;
385 struct drm_framebuffer *fb;
386 struct intel_framebuffer *intel_fb;
387 struct drm_i915_gem_object *obj;
388 int enable_fbc;
389
390 if (!i915_powersave)
391 return;
392
393 if (!I915_HAS_FBC(dev))
394 return;
395
396 /*
397 * If FBC is already on, we just have to verify that we can
398 * keep it that way...
399 * Need to disable if:
400 * - more than one pipe is active
401 * - changing FBC params (stride, fence, mode)
402 * - new fb is too large to fit in compressed buffer
403 * - going to an unsupported config (interlace, pixel multiply, etc.)
404 */
405 list_for_each_entry(tmp_crtc, &dev->mode_config.crtc_list, head) {
406 if (tmp_crtc->enabled &&
407 !to_intel_crtc(tmp_crtc)->primary_disabled &&
408 tmp_crtc->fb) {
409 if (crtc) {
410 DRM_DEBUG_KMS("more than one pipe active, disabling compression\n");
411 dev_priv->no_fbc_reason = FBC_MULTIPLE_PIPES;
412 goto out_disable;
413 }
414 crtc = tmp_crtc;
415 }
416 }
417
418 if (!crtc || crtc->fb == NULL) {
419 DRM_DEBUG_KMS("no output, disabling\n");
420 dev_priv->no_fbc_reason = FBC_NO_OUTPUT;
421 goto out_disable;
422 }
423
424 intel_crtc = to_intel_crtc(crtc);
425 fb = crtc->fb;
426 intel_fb = to_intel_framebuffer(fb);
427 obj = intel_fb->obj;
428
429 enable_fbc = i915_enable_fbc;
430 if (enable_fbc < 0) {
431 DRM_DEBUG_KMS("fbc set to per-chip default\n");
432 enable_fbc = 1;
433 if (INTEL_INFO(dev)->gen <= 6)
434 enable_fbc = 0;
435 }
436 if (!enable_fbc) {
437 DRM_DEBUG_KMS("fbc disabled per module param\n");
438 dev_priv->no_fbc_reason = FBC_MODULE_PARAM;
439 goto out_disable;
440 }
441 if (intel_fb->obj->base.size > dev_priv->cfb_size) {
442 DRM_DEBUG_KMS("framebuffer too large, disabling "
443 "compression\n");
444 dev_priv->no_fbc_reason = FBC_STOLEN_TOO_SMALL;
445 goto out_disable;
446 }
447 if ((crtc->mode.flags & DRM_MODE_FLAG_INTERLACE) ||
448 (crtc->mode.flags & DRM_MODE_FLAG_DBLSCAN)) {
449 DRM_DEBUG_KMS("mode incompatible with compression, "
450 "disabling\n");
451 dev_priv->no_fbc_reason = FBC_UNSUPPORTED_MODE;
452 goto out_disable;
453 }
454 if ((crtc->mode.hdisplay > 2048) ||
455 (crtc->mode.vdisplay > 1536)) {
456 DRM_DEBUG_KMS("mode too large for compression, disabling\n");
457 dev_priv->no_fbc_reason = FBC_MODE_TOO_LARGE;
458 goto out_disable;
459 }
460 if ((IS_I915GM(dev) || IS_I945GM(dev)) && intel_crtc->plane != 0) {
461 DRM_DEBUG_KMS("plane not 0, disabling compression\n");
462 dev_priv->no_fbc_reason = FBC_BAD_PLANE;
463 goto out_disable;
464 }
465
466 /* The use of a CPU fence is mandatory in order to detect writes
467 * by the CPU to the scanout and trigger updates to the FBC.
468 */
469 if (obj->tiling_mode != I915_TILING_X ||
470 obj->fence_reg == I915_FENCE_REG_NONE) {
471 DRM_DEBUG_KMS("framebuffer not tiled or fenced, disabling compression\n");
472 dev_priv->no_fbc_reason = FBC_NOT_TILED;
473 goto out_disable;
474 }
475
476 /* If the kernel debugger is active, always disable compression */
477 if (in_dbg_master())
478 goto out_disable;
479
480 /* If the scanout has not changed, don't modify the FBC settings.
481 * Note that we make the fundamental assumption that the fb->obj
482 * cannot be unpinned (and have its GTT offset and fence revoked)
483 * without first being decoupled from the scanout and FBC disabled.
484 */
485 if (dev_priv->cfb_plane == intel_crtc->plane &&
486 dev_priv->cfb_fb == fb->base.id &&
487 dev_priv->cfb_y == crtc->y)
488 return;
489
490 if (intel_fbc_enabled(dev)) {
491 /* We update FBC along two paths, after changing fb/crtc
492 * configuration (modeswitching) and after page-flipping
493 * finishes. For the latter, we know that not only did
494 * we disable the FBC at the start of the page-flip
495 * sequence, but also more than one vblank has passed.
496 *
497 * For the former case of modeswitching, it is possible
498 * to switch between two FBC valid configurations
499 * instantaneously so we do need to disable the FBC
500 * before we can modify its control registers. We also
501 * have to wait for the next vblank for that to take
502 * effect. However, since we delay enabling FBC we can
503 * assume that a vblank has passed since disabling and
504 * that we can safely alter the registers in the deferred
505 * callback.
506 *
507 * In the scenario that we go from a valid to invalid
508 * and then back to valid FBC configuration we have
509 * no strict enforcement that a vblank occurred since
510 * disabling the FBC. However, along all current pipe
511 * disabling paths we do need to wait for a vblank at
512 * some point. And we wait before enabling FBC anyway.
513 */
514 DRM_DEBUG_KMS("disabling active FBC for update\n");
515 intel_disable_fbc(dev);
516 }
517
518 intel_enable_fbc(crtc, 500);
519 return;
520
521 out_disable:
522 /* Multiple disables should be harmless */
523 if (intel_fbc_enabled(dev)) {
524 DRM_DEBUG_KMS("unsupported config, disabling FBC\n");
525 intel_disable_fbc(dev);
526 }
527 }
528
529 static void i915_pineview_get_mem_freq(struct drm_device *dev)
530 {
531 drm_i915_private_t *dev_priv = dev->dev_private;
532 u32 tmp;
533
534 tmp = I915_READ(CLKCFG);
535
536 switch (tmp & CLKCFG_FSB_MASK) {
537 case CLKCFG_FSB_533:
538 dev_priv->fsb_freq = 533; /* 133*4 */
539 break;
540 case CLKCFG_FSB_800:
541 dev_priv->fsb_freq = 800; /* 200*4 */
542 break;
543 case CLKCFG_FSB_667:
544 dev_priv->fsb_freq = 667; /* 167*4 */
545 break;
546 case CLKCFG_FSB_400:
547 dev_priv->fsb_freq = 400; /* 100*4 */
548 break;
549 }
550
551 switch (tmp & CLKCFG_MEM_MASK) {
552 case CLKCFG_MEM_533:
553 dev_priv->mem_freq = 533;
554 break;
555 case CLKCFG_MEM_667:
556 dev_priv->mem_freq = 667;
557 break;
558 case CLKCFG_MEM_800:
559 dev_priv->mem_freq = 800;
560 break;
561 }
562
563 /* detect pineview DDR3 setting */
564 tmp = I915_READ(CSHRDDR3CTL);
565 dev_priv->is_ddr3 = (tmp & CSHRDDR3CTL_DDR3) ? 1 : 0;
566 }
567
568 static void i915_ironlake_get_mem_freq(struct drm_device *dev)
569 {
570 drm_i915_private_t *dev_priv = dev->dev_private;
571 u16 ddrpll, csipll;
572
573 ddrpll = I915_READ16(DDRMPLL1);
574 csipll = I915_READ16(CSIPLL0);
575
576 switch (ddrpll & 0xff) {
577 case 0xc:
578 dev_priv->mem_freq = 800;
579 break;
580 case 0x10:
581 dev_priv->mem_freq = 1066;
582 break;
583 case 0x14:
584 dev_priv->mem_freq = 1333;
585 break;
586 case 0x18:
587 dev_priv->mem_freq = 1600;
588 break;
589 default:
590 DRM_DEBUG_DRIVER("unknown memory frequency 0x%02x\n",
591 ddrpll & 0xff);
592 dev_priv->mem_freq = 0;
593 break;
594 }
595
596 dev_priv->r_t = dev_priv->mem_freq;
597
598 switch (csipll & 0x3ff) {
599 case 0x00c:
600 dev_priv->fsb_freq = 3200;
601 break;
602 case 0x00e:
603 dev_priv->fsb_freq = 3733;
604 break;
605 case 0x010:
606 dev_priv->fsb_freq = 4266;
607 break;
608 case 0x012:
609 dev_priv->fsb_freq = 4800;
610 break;
611 case 0x014:
612 dev_priv->fsb_freq = 5333;
613 break;
614 case 0x016:
615 dev_priv->fsb_freq = 5866;
616 break;
617 case 0x018:
618 dev_priv->fsb_freq = 6400;
619 break;
620 default:
621 DRM_DEBUG_DRIVER("unknown fsb frequency 0x%04x\n",
622 csipll & 0x3ff);
623 dev_priv->fsb_freq = 0;
624 break;
625 }
626
627 if (dev_priv->fsb_freq == 3200) {
628 dev_priv->c_m = 0;
629 } else if (dev_priv->fsb_freq > 3200 && dev_priv->fsb_freq <= 4800) {
630 dev_priv->c_m = 1;
631 } else {
632 dev_priv->c_m = 2;
633 }
634 }
635
636 static const struct cxsr_latency cxsr_latency_table[] = {
637 {1, 0, 800, 400, 3382, 33382, 3983, 33983}, /* DDR2-400 SC */
638 {1, 0, 800, 667, 3354, 33354, 3807, 33807}, /* DDR2-667 SC */
639 {1, 0, 800, 800, 3347, 33347, 3763, 33763}, /* DDR2-800 SC */
640 {1, 1, 800, 667, 6420, 36420, 6873, 36873}, /* DDR3-667 SC */
641 {1, 1, 800, 800, 5902, 35902, 6318, 36318}, /* DDR3-800 SC */
642
643 {1, 0, 667, 400, 3400, 33400, 4021, 34021}, /* DDR2-400 SC */
644 {1, 0, 667, 667, 3372, 33372, 3845, 33845}, /* DDR2-667 SC */
645 {1, 0, 667, 800, 3386, 33386, 3822, 33822}, /* DDR2-800 SC */
646 {1, 1, 667, 667, 6438, 36438, 6911, 36911}, /* DDR3-667 SC */
647 {1, 1, 667, 800, 5941, 35941, 6377, 36377}, /* DDR3-800 SC */
648
649 {1, 0, 400, 400, 3472, 33472, 4173, 34173}, /* DDR2-400 SC */
650 {1, 0, 400, 667, 3443, 33443, 3996, 33996}, /* DDR2-667 SC */
651 {1, 0, 400, 800, 3430, 33430, 3946, 33946}, /* DDR2-800 SC */
652 {1, 1, 400, 667, 6509, 36509, 7062, 37062}, /* DDR3-667 SC */
653 {1, 1, 400, 800, 5985, 35985, 6501, 36501}, /* DDR3-800 SC */
654
655 {0, 0, 800, 400, 3438, 33438, 4065, 34065}, /* DDR2-400 SC */
656 {0, 0, 800, 667, 3410, 33410, 3889, 33889}, /* DDR2-667 SC */
657 {0, 0, 800, 800, 3403, 33403, 3845, 33845}, /* DDR2-800 SC */
658 {0, 1, 800, 667, 6476, 36476, 6955, 36955}, /* DDR3-667 SC */
659 {0, 1, 800, 800, 5958, 35958, 6400, 36400}, /* DDR3-800 SC */
660
661 {0, 0, 667, 400, 3456, 33456, 4103, 34106}, /* DDR2-400 SC */
662 {0, 0, 667, 667, 3428, 33428, 3927, 33927}, /* DDR2-667 SC */
663 {0, 0, 667, 800, 3443, 33443, 3905, 33905}, /* DDR2-800 SC */
664 {0, 1, 667, 667, 6494, 36494, 6993, 36993}, /* DDR3-667 SC */
665 {0, 1, 667, 800, 5998, 35998, 6460, 36460}, /* DDR3-800 SC */
666
667 {0, 0, 400, 400, 3528, 33528, 4255, 34255}, /* DDR2-400 SC */
668 {0, 0, 400, 667, 3500, 33500, 4079, 34079}, /* DDR2-667 SC */
669 {0, 0, 400, 800, 3487, 33487, 4029, 34029}, /* DDR2-800 SC */
670 {0, 1, 400, 667, 6566, 36566, 7145, 37145}, /* DDR3-667 SC */
671 {0, 1, 400, 800, 6042, 36042, 6584, 36584}, /* DDR3-800 SC */
672 };
673
674 static const struct cxsr_latency *intel_get_cxsr_latency(int is_desktop,
675 int is_ddr3,
676 int fsb,
677 int mem)
678 {
679 const struct cxsr_latency *latency;
680 int i;
681
682 if (fsb == 0 || mem == 0)
683 return NULL;
684
685 for (i = 0; i < ARRAY_SIZE(cxsr_latency_table); i++) {
686 latency = &cxsr_latency_table[i];
687 if (is_desktop == latency->is_desktop &&
688 is_ddr3 == latency->is_ddr3 &&
689 fsb == latency->fsb_freq && mem == latency->mem_freq)
690 return latency;
691 }
692
693 DRM_DEBUG_KMS("Unknown FSB/MEM found, disable CxSR\n");
694
695 return NULL;
696 }
697
698 static void pineview_disable_cxsr(struct drm_device *dev)
699 {
700 struct drm_i915_private *dev_priv = dev->dev_private;
701
702 /* deactivate cxsr */
703 I915_WRITE(DSPFW3, I915_READ(DSPFW3) & ~PINEVIEW_SELF_REFRESH_EN);
704 }
705
706 /*
707 * Latency for FIFO fetches is dependent on several factors:
708 * - memory configuration (speed, channels)
709 * - chipset
710 * - current MCH state
711 * It can be fairly high in some situations, so here we assume a fairly
712 * pessimal value. It's a tradeoff between extra memory fetches (if we
713 * set this value too high, the FIFO will fetch frequently to stay full)
714 * and power consumption (set it too low to save power and we might see
715 * FIFO underruns and display "flicker").
716 *
717 * A value of 5us seems to be a good balance; safe for very low end
718 * platforms but not overly aggressive on lower latency configs.
719 */
720 static const int latency_ns = 5000;
721
722 static int i9xx_get_fifo_size(struct drm_device *dev, int plane)
723 {
724 struct drm_i915_private *dev_priv = dev->dev_private;
725 uint32_t dsparb = I915_READ(DSPARB);
726 int size;
727
728 size = dsparb & 0x7f;
729 if (plane)
730 size = ((dsparb >> DSPARB_CSTART_SHIFT) & 0x7f) - size;
731
732 DRM_DEBUG_KMS("FIFO size - (0x%08x) %s: %d\n", dsparb,
733 plane ? "B" : "A", size);
734
735 return size;
736 }
737
738 static int i85x_get_fifo_size(struct drm_device *dev, int plane)
739 {
740 struct drm_i915_private *dev_priv = dev->dev_private;
741 uint32_t dsparb = I915_READ(DSPARB);
742 int size;
743
744 size = dsparb & 0x1ff;
745 if (plane)
746 size = ((dsparb >> DSPARB_BEND_SHIFT) & 0x1ff) - size;
747 size >>= 1; /* Convert to cachelines */
748
749 DRM_DEBUG_KMS("FIFO size - (0x%08x) %s: %d\n", dsparb,
750 plane ? "B" : "A", size);
751
752 return size;
753 }
754
755 static int i845_get_fifo_size(struct drm_device *dev, int plane)
756 {
757 struct drm_i915_private *dev_priv = dev->dev_private;
758 uint32_t dsparb = I915_READ(DSPARB);
759 int size;
760
761 size = dsparb & 0x7f;
762 size >>= 2; /* Convert to cachelines */
763
764 DRM_DEBUG_KMS("FIFO size - (0x%08x) %s: %d\n", dsparb,
765 plane ? "B" : "A",
766 size);
767
768 return size;
769 }
770
771 static int i830_get_fifo_size(struct drm_device *dev, int plane)
772 {
773 struct drm_i915_private *dev_priv = dev->dev_private;
774 uint32_t dsparb = I915_READ(DSPARB);
775 int size;
776
777 size = dsparb & 0x7f;
778 size >>= 1; /* Convert to cachelines */
779
780 DRM_DEBUG_KMS("FIFO size - (0x%08x) %s: %d\n", dsparb,
781 plane ? "B" : "A", size);
782
783 return size;
784 }
785
786 /* Pineview has different values for various configs */
787 static const struct intel_watermark_params pineview_display_wm = {
788 PINEVIEW_DISPLAY_FIFO,
789 PINEVIEW_MAX_WM,
790 PINEVIEW_DFT_WM,
791 PINEVIEW_GUARD_WM,
792 PINEVIEW_FIFO_LINE_SIZE
793 };
794 static const struct intel_watermark_params pineview_display_hplloff_wm = {
795 PINEVIEW_DISPLAY_FIFO,
796 PINEVIEW_MAX_WM,
797 PINEVIEW_DFT_HPLLOFF_WM,
798 PINEVIEW_GUARD_WM,
799 PINEVIEW_FIFO_LINE_SIZE
800 };
801 static const struct intel_watermark_params pineview_cursor_wm = {
802 PINEVIEW_CURSOR_FIFO,
803 PINEVIEW_CURSOR_MAX_WM,
804 PINEVIEW_CURSOR_DFT_WM,
805 PINEVIEW_CURSOR_GUARD_WM,
806 PINEVIEW_FIFO_LINE_SIZE,
807 };
808 static const struct intel_watermark_params pineview_cursor_hplloff_wm = {
809 PINEVIEW_CURSOR_FIFO,
810 PINEVIEW_CURSOR_MAX_WM,
811 PINEVIEW_CURSOR_DFT_WM,
812 PINEVIEW_CURSOR_GUARD_WM,
813 PINEVIEW_FIFO_LINE_SIZE
814 };
815 static const struct intel_watermark_params g4x_wm_info = {
816 G4X_FIFO_SIZE,
817 G4X_MAX_WM,
818 G4X_MAX_WM,
819 2,
820 G4X_FIFO_LINE_SIZE,
821 };
822 static const struct intel_watermark_params g4x_cursor_wm_info = {
823 I965_CURSOR_FIFO,
824 I965_CURSOR_MAX_WM,
825 I965_CURSOR_DFT_WM,
826 2,
827 G4X_FIFO_LINE_SIZE,
828 };
829 static const struct intel_watermark_params valleyview_wm_info = {
830 VALLEYVIEW_FIFO_SIZE,
831 VALLEYVIEW_MAX_WM,
832 VALLEYVIEW_MAX_WM,
833 2,
834 G4X_FIFO_LINE_SIZE,
835 };
836 static const struct intel_watermark_params valleyview_cursor_wm_info = {
837 I965_CURSOR_FIFO,
838 VALLEYVIEW_CURSOR_MAX_WM,
839 I965_CURSOR_DFT_WM,
840 2,
841 G4X_FIFO_LINE_SIZE,
842 };
843 static const struct intel_watermark_params i965_cursor_wm_info = {
844 I965_CURSOR_FIFO,
845 I965_CURSOR_MAX_WM,
846 I965_CURSOR_DFT_WM,
847 2,
848 I915_FIFO_LINE_SIZE,
849 };
850 static const struct intel_watermark_params i945_wm_info = {
851 I945_FIFO_SIZE,
852 I915_MAX_WM,
853 1,
854 2,
855 I915_FIFO_LINE_SIZE
856 };
857 static const struct intel_watermark_params i915_wm_info = {
858 I915_FIFO_SIZE,
859 I915_MAX_WM,
860 1,
861 2,
862 I915_FIFO_LINE_SIZE
863 };
864 static const struct intel_watermark_params i855_wm_info = {
865 I855GM_FIFO_SIZE,
866 I915_MAX_WM,
867 1,
868 2,
869 I830_FIFO_LINE_SIZE
870 };
871 static const struct intel_watermark_params i830_wm_info = {
872 I830_FIFO_SIZE,
873 I915_MAX_WM,
874 1,
875 2,
876 I830_FIFO_LINE_SIZE
877 };
878
879 static const struct intel_watermark_params ironlake_display_wm_info = {
880 ILK_DISPLAY_FIFO,
881 ILK_DISPLAY_MAXWM,
882 ILK_DISPLAY_DFTWM,
883 2,
884 ILK_FIFO_LINE_SIZE
885 };
886 static const struct intel_watermark_params ironlake_cursor_wm_info = {
887 ILK_CURSOR_FIFO,
888 ILK_CURSOR_MAXWM,
889 ILK_CURSOR_DFTWM,
890 2,
891 ILK_FIFO_LINE_SIZE
892 };
893 static const struct intel_watermark_params ironlake_display_srwm_info = {
894 ILK_DISPLAY_SR_FIFO,
895 ILK_DISPLAY_MAX_SRWM,
896 ILK_DISPLAY_DFT_SRWM,
897 2,
898 ILK_FIFO_LINE_SIZE
899 };
900 static const struct intel_watermark_params ironlake_cursor_srwm_info = {
901 ILK_CURSOR_SR_FIFO,
902 ILK_CURSOR_MAX_SRWM,
903 ILK_CURSOR_DFT_SRWM,
904 2,
905 ILK_FIFO_LINE_SIZE
906 };
907
908 static const struct intel_watermark_params sandybridge_display_wm_info = {
909 SNB_DISPLAY_FIFO,
910 SNB_DISPLAY_MAXWM,
911 SNB_DISPLAY_DFTWM,
912 2,
913 SNB_FIFO_LINE_SIZE
914 };
915 static const struct intel_watermark_params sandybridge_cursor_wm_info = {
916 SNB_CURSOR_FIFO,
917 SNB_CURSOR_MAXWM,
918 SNB_CURSOR_DFTWM,
919 2,
920 SNB_FIFO_LINE_SIZE
921 };
922 static const struct intel_watermark_params sandybridge_display_srwm_info = {
923 SNB_DISPLAY_SR_FIFO,
924 SNB_DISPLAY_MAX_SRWM,
925 SNB_DISPLAY_DFT_SRWM,
926 2,
927 SNB_FIFO_LINE_SIZE
928 };
929 static const struct intel_watermark_params sandybridge_cursor_srwm_info = {
930 SNB_CURSOR_SR_FIFO,
931 SNB_CURSOR_MAX_SRWM,
932 SNB_CURSOR_DFT_SRWM,
933 2,
934 SNB_FIFO_LINE_SIZE
935 };
936
937
938 /**
939 * intel_calculate_wm - calculate watermark level
940 * @clock_in_khz: pixel clock
941 * @wm: chip FIFO params
942 * @pixel_size: display pixel size
943 * @latency_ns: memory latency for the platform
944 *
945 * Calculate the watermark level (the level at which the display plane will
946 * start fetching from memory again). Each chip has a different display
947 * FIFO size and allocation, so the caller needs to figure that out and pass
948 * in the correct intel_watermark_params structure.
949 *
950 * As the pixel clock runs, the FIFO will be drained at a rate that depends
951 * on the pixel size. When it reaches the watermark level, it'll start
952 * fetching FIFO line sized based chunks from memory until the FIFO fills
953 * past the watermark point. If the FIFO drains completely, a FIFO underrun
954 * will occur, and a display engine hang could result.
955 */
956 static unsigned long intel_calculate_wm(unsigned long clock_in_khz,
957 const struct intel_watermark_params *wm,
958 int fifo_size,
959 int pixel_size,
960 unsigned long latency_ns)
961 {
962 long entries_required, wm_size;
963
964 /*
965 * Note: we need to make sure we don't overflow for various clock &
966 * latency values.
967 * clocks go from a few thousand to several hundred thousand.
968 * latency is usually a few thousand
969 */
970 entries_required = ((clock_in_khz / 1000) * pixel_size * latency_ns) /
971 1000;
972 entries_required = DIV_ROUND_UP(entries_required, wm->cacheline_size);
973
974 DRM_DEBUG_KMS("FIFO entries required for mode: %ld\n", entries_required);
975
976 wm_size = fifo_size - (entries_required + wm->guard_size);
977
978 DRM_DEBUG_KMS("FIFO watermark level: %ld\n", wm_size);
979
980 /* Don't promote wm_size to unsigned... */
981 if (wm_size > (long)wm->max_wm)
982 wm_size = wm->max_wm;
983 if (wm_size <= 0)
984 wm_size = wm->default_wm;
985 return wm_size;
986 }
987
988 static struct drm_crtc *single_enabled_crtc(struct drm_device *dev)
989 {
990 struct drm_crtc *crtc, *enabled = NULL;
991
992 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
993 if (crtc->enabled && crtc->fb) {
994 if (enabled)
995 return NULL;
996 enabled = crtc;
997 }
998 }
999
1000 return enabled;
1001 }
1002
1003 static void pineview_update_wm(struct drm_device *dev)
1004 {
1005 struct drm_i915_private *dev_priv = dev->dev_private;
1006 struct drm_crtc *crtc;
1007 const struct cxsr_latency *latency;
1008 u32 reg;
1009 unsigned long wm;
1010
1011 latency = intel_get_cxsr_latency(IS_PINEVIEW_G(dev), dev_priv->is_ddr3,
1012 dev_priv->fsb_freq, dev_priv->mem_freq);
1013 if (!latency) {
1014 DRM_DEBUG_KMS("Unknown FSB/MEM found, disable CxSR\n");
1015 pineview_disable_cxsr(dev);
1016 return;
1017 }
1018
1019 crtc = single_enabled_crtc(dev);
1020 if (crtc) {
1021 int clock = crtc->mode.clock;
1022 int pixel_size = crtc->fb->bits_per_pixel / 8;
1023
1024 /* Display SR */
1025 wm = intel_calculate_wm(clock, &pineview_display_wm,
1026 pineview_display_wm.fifo_size,
1027 pixel_size, latency->display_sr);
1028 reg = I915_READ(DSPFW1);
1029 reg &= ~DSPFW_SR_MASK;
1030 reg |= wm << DSPFW_SR_SHIFT;
1031 I915_WRITE(DSPFW1, reg);
1032 DRM_DEBUG_KMS("DSPFW1 register is %x\n", reg);
1033
1034 /* cursor SR */
1035 wm = intel_calculate_wm(clock, &pineview_cursor_wm,
1036 pineview_display_wm.fifo_size,
1037 pixel_size, latency->cursor_sr);
1038 reg = I915_READ(DSPFW3);
1039 reg &= ~DSPFW_CURSOR_SR_MASK;
1040 reg |= (wm & 0x3f) << DSPFW_CURSOR_SR_SHIFT;
1041 I915_WRITE(DSPFW3, reg);
1042
1043 /* Display HPLL off SR */
1044 wm = intel_calculate_wm(clock, &pineview_display_hplloff_wm,
1045 pineview_display_hplloff_wm.fifo_size,
1046 pixel_size, latency->display_hpll_disable);
1047 reg = I915_READ(DSPFW3);
1048 reg &= ~DSPFW_HPLL_SR_MASK;
1049 reg |= wm & DSPFW_HPLL_SR_MASK;
1050 I915_WRITE(DSPFW3, reg);
1051
1052 /* cursor HPLL off SR */
1053 wm = intel_calculate_wm(clock, &pineview_cursor_hplloff_wm,
1054 pineview_display_hplloff_wm.fifo_size,
1055 pixel_size, latency->cursor_hpll_disable);
1056 reg = I915_READ(DSPFW3);
1057 reg &= ~DSPFW_HPLL_CURSOR_MASK;
1058 reg |= (wm & 0x3f) << DSPFW_HPLL_CURSOR_SHIFT;
1059 I915_WRITE(DSPFW3, reg);
1060 DRM_DEBUG_KMS("DSPFW3 register is %x\n", reg);
1061
1062 /* activate cxsr */
1063 I915_WRITE(DSPFW3,
1064 I915_READ(DSPFW3) | PINEVIEW_SELF_REFRESH_EN);
1065 DRM_DEBUG_KMS("Self-refresh is enabled\n");
1066 } else {
1067 pineview_disable_cxsr(dev);
1068 DRM_DEBUG_KMS("Self-refresh is disabled\n");
1069 }
1070 }
1071
1072 static bool g4x_compute_wm0(struct drm_device *dev,
1073 int plane,
1074 const struct intel_watermark_params *display,
1075 int display_latency_ns,
1076 const struct intel_watermark_params *cursor,
1077 int cursor_latency_ns,
1078 int *plane_wm,
1079 int *cursor_wm)
1080 {
1081 struct drm_crtc *crtc;
1082 int htotal, hdisplay, clock, pixel_size;
1083 int line_time_us, line_count;
1084 int entries, tlb_miss;
1085
1086 crtc = intel_get_crtc_for_plane(dev, plane);
1087 if (crtc->fb == NULL || !crtc->enabled) {
1088 *cursor_wm = cursor->guard_size;
1089 *plane_wm = display->guard_size;
1090 return false;
1091 }
1092
1093 htotal = crtc->mode.htotal;
1094 hdisplay = crtc->mode.hdisplay;
1095 clock = crtc->mode.clock;
1096 pixel_size = crtc->fb->bits_per_pixel / 8;
1097
1098 /* Use the small buffer method to calculate plane watermark */
1099 entries = ((clock * pixel_size / 1000) * display_latency_ns) / 1000;
1100 tlb_miss = display->fifo_size*display->cacheline_size - hdisplay * 8;
1101 if (tlb_miss > 0)
1102 entries += tlb_miss;
1103 entries = DIV_ROUND_UP(entries, display->cacheline_size);
1104 *plane_wm = entries + display->guard_size;
1105 if (*plane_wm > (int)display->max_wm)
1106 *plane_wm = display->max_wm;
1107
1108 /* Use the large buffer method to calculate cursor watermark */
1109 line_time_us = ((htotal * 1000) / clock);
1110 line_count = (cursor_latency_ns / line_time_us + 1000) / 1000;
1111 entries = line_count * 64 * pixel_size;
1112 tlb_miss = cursor->fifo_size*cursor->cacheline_size - hdisplay * 8;
1113 if (tlb_miss > 0)
1114 entries += tlb_miss;
1115 entries = DIV_ROUND_UP(entries, cursor->cacheline_size);
1116 *cursor_wm = entries + cursor->guard_size;
1117 if (*cursor_wm > (int)cursor->max_wm)
1118 *cursor_wm = (int)cursor->max_wm;
1119
1120 return true;
1121 }
1122
1123 /*
1124 * Check the wm result.
1125 *
1126 * If any calculated watermark values is larger than the maximum value that
1127 * can be programmed into the associated watermark register, that watermark
1128 * must be disabled.
1129 */
1130 static bool g4x_check_srwm(struct drm_device *dev,
1131 int display_wm, int cursor_wm,
1132 const struct intel_watermark_params *display,
1133 const struct intel_watermark_params *cursor)
1134 {
1135 DRM_DEBUG_KMS("SR watermark: display plane %d, cursor %d\n",
1136 display_wm, cursor_wm);
1137
1138 if (display_wm > display->max_wm) {
1139 DRM_DEBUG_KMS("display watermark is too large(%d/%ld), disabling\n",
1140 display_wm, display->max_wm);
1141 return false;
1142 }
1143
1144 if (cursor_wm > cursor->max_wm) {
1145 DRM_DEBUG_KMS("cursor watermark is too large(%d/%ld), disabling\n",
1146 cursor_wm, cursor->max_wm);
1147 return false;
1148 }
1149
1150 if (!(display_wm || cursor_wm)) {
1151 DRM_DEBUG_KMS("SR latency is 0, disabling\n");
1152 return false;
1153 }
1154
1155 return true;
1156 }
1157
1158 static bool g4x_compute_srwm(struct drm_device *dev,
1159 int plane,
1160 int latency_ns,
1161 const struct intel_watermark_params *display,
1162 const struct intel_watermark_params *cursor,
1163 int *display_wm, int *cursor_wm)
1164 {
1165 struct drm_crtc *crtc;
1166 int hdisplay, htotal, pixel_size, clock;
1167 unsigned long line_time_us;
1168 int line_count, line_size;
1169 int small, large;
1170 int entries;
1171
1172 if (!latency_ns) {
1173 *display_wm = *cursor_wm = 0;
1174 return false;
1175 }
1176
1177 crtc = intel_get_crtc_for_plane(dev, plane);
1178 hdisplay = crtc->mode.hdisplay;
1179 htotal = crtc->mode.htotal;
1180 clock = crtc->mode.clock;
1181 pixel_size = crtc->fb->bits_per_pixel / 8;
1182
1183 line_time_us = (htotal * 1000) / clock;
1184 line_count = (latency_ns / line_time_us + 1000) / 1000;
1185 line_size = hdisplay * pixel_size;
1186
1187 /* Use the minimum of the small and large buffer method for primary */
1188 small = ((clock * pixel_size / 1000) * latency_ns) / 1000;
1189 large = line_count * line_size;
1190
1191 entries = DIV_ROUND_UP(min(small, large), display->cacheline_size);
1192 *display_wm = entries + display->guard_size;
1193
1194 /* calculate the self-refresh watermark for display cursor */
1195 entries = line_count * pixel_size * 64;
1196 entries = DIV_ROUND_UP(entries, cursor->cacheline_size);
1197 *cursor_wm = entries + cursor->guard_size;
1198
1199 return g4x_check_srwm(dev,
1200 *display_wm, *cursor_wm,
1201 display, cursor);
1202 }
1203
1204 static bool vlv_compute_drain_latency(struct drm_device *dev,
1205 int plane,
1206 int *plane_prec_mult,
1207 int *plane_dl,
1208 int *cursor_prec_mult,
1209 int *cursor_dl)
1210 {
1211 struct drm_crtc *crtc;
1212 int clock, pixel_size;
1213 int entries;
1214
1215 crtc = intel_get_crtc_for_plane(dev, plane);
1216 if (crtc->fb == NULL || !crtc->enabled)
1217 return false;
1218
1219 clock = crtc->mode.clock; /* VESA DOT Clock */
1220 pixel_size = crtc->fb->bits_per_pixel / 8; /* BPP */
1221
1222 entries = (clock / 1000) * pixel_size;
1223 *plane_prec_mult = (entries > 256) ?
1224 DRAIN_LATENCY_PRECISION_32 : DRAIN_LATENCY_PRECISION_16;
1225 *plane_dl = (64 * (*plane_prec_mult) * 4) / ((clock / 1000) *
1226 pixel_size);
1227
1228 entries = (clock / 1000) * 4; /* BPP is always 4 for cursor */
1229 *cursor_prec_mult = (entries > 256) ?
1230 DRAIN_LATENCY_PRECISION_32 : DRAIN_LATENCY_PRECISION_16;
1231 *cursor_dl = (64 * (*cursor_prec_mult) * 4) / ((clock / 1000) * 4);
1232
1233 return true;
1234 }
1235
1236 /*
1237 * Update drain latency registers of memory arbiter
1238 *
1239 * Valleyview SoC has a new memory arbiter and needs drain latency registers
1240 * to be programmed. Each plane has a drain latency multiplier and a drain
1241 * latency value.
1242 */
1243
1244 static void vlv_update_drain_latency(struct drm_device *dev)
1245 {
1246 struct drm_i915_private *dev_priv = dev->dev_private;
1247 int planea_prec, planea_dl, planeb_prec, planeb_dl;
1248 int cursora_prec, cursora_dl, cursorb_prec, cursorb_dl;
1249 int plane_prec_mult, cursor_prec_mult; /* Precision multiplier is
1250 either 16 or 32 */
1251
1252 /* For plane A, Cursor A */
1253 if (vlv_compute_drain_latency(dev, 0, &plane_prec_mult, &planea_dl,
1254 &cursor_prec_mult, &cursora_dl)) {
1255 cursora_prec = (cursor_prec_mult == DRAIN_LATENCY_PRECISION_32) ?
1256 DDL_CURSORA_PRECISION_32 : DDL_CURSORA_PRECISION_16;
1257 planea_prec = (plane_prec_mult == DRAIN_LATENCY_PRECISION_32) ?
1258 DDL_PLANEA_PRECISION_32 : DDL_PLANEA_PRECISION_16;
1259
1260 I915_WRITE(VLV_DDL1, cursora_prec |
1261 (cursora_dl << DDL_CURSORA_SHIFT) |
1262 planea_prec | planea_dl);
1263 }
1264
1265 /* For plane B, Cursor B */
1266 if (vlv_compute_drain_latency(dev, 1, &plane_prec_mult, &planeb_dl,
1267 &cursor_prec_mult, &cursorb_dl)) {
1268 cursorb_prec = (cursor_prec_mult == DRAIN_LATENCY_PRECISION_32) ?
1269 DDL_CURSORB_PRECISION_32 : DDL_CURSORB_PRECISION_16;
1270 planeb_prec = (plane_prec_mult == DRAIN_LATENCY_PRECISION_32) ?
1271 DDL_PLANEB_PRECISION_32 : DDL_PLANEB_PRECISION_16;
1272
1273 I915_WRITE(VLV_DDL2, cursorb_prec |
1274 (cursorb_dl << DDL_CURSORB_SHIFT) |
1275 planeb_prec | planeb_dl);
1276 }
1277 }
1278
1279 #define single_plane_enabled(mask) is_power_of_2(mask)
1280
1281 static void valleyview_update_wm(struct drm_device *dev)
1282 {
1283 static const int sr_latency_ns = 12000;
1284 struct drm_i915_private *dev_priv = dev->dev_private;
1285 int planea_wm, planeb_wm, cursora_wm, cursorb_wm;
1286 int plane_sr, cursor_sr;
1287 unsigned int enabled = 0;
1288
1289 vlv_update_drain_latency(dev);
1290
1291 if (g4x_compute_wm0(dev, 0,
1292 &valleyview_wm_info, latency_ns,
1293 &valleyview_cursor_wm_info, latency_ns,
1294 &planea_wm, &cursora_wm))
1295 enabled |= 1;
1296
1297 if (g4x_compute_wm0(dev, 1,
1298 &valleyview_wm_info, latency_ns,
1299 &valleyview_cursor_wm_info, latency_ns,
1300 &planeb_wm, &cursorb_wm))
1301 enabled |= 2;
1302
1303 plane_sr = cursor_sr = 0;
1304 if (single_plane_enabled(enabled) &&
1305 g4x_compute_srwm(dev, ffs(enabled) - 1,
1306 sr_latency_ns,
1307 &valleyview_wm_info,
1308 &valleyview_cursor_wm_info,
1309 &plane_sr, &cursor_sr))
1310 I915_WRITE(FW_BLC_SELF_VLV, FW_CSPWRDWNEN);
1311 else
1312 I915_WRITE(FW_BLC_SELF_VLV,
1313 I915_READ(FW_BLC_SELF_VLV) & ~FW_CSPWRDWNEN);
1314
1315 DRM_DEBUG_KMS("Setting FIFO watermarks - A: plane=%d, cursor=%d, B: plane=%d, cursor=%d, SR: plane=%d, cursor=%d\n",
1316 planea_wm, cursora_wm,
1317 planeb_wm, cursorb_wm,
1318 plane_sr, cursor_sr);
1319
1320 I915_WRITE(DSPFW1,
1321 (plane_sr << DSPFW_SR_SHIFT) |
1322 (cursorb_wm << DSPFW_CURSORB_SHIFT) |
1323 (planeb_wm << DSPFW_PLANEB_SHIFT) |
1324 planea_wm);
1325 I915_WRITE(DSPFW2,
1326 (I915_READ(DSPFW2) & DSPFW_CURSORA_MASK) |
1327 (cursora_wm << DSPFW_CURSORA_SHIFT));
1328 I915_WRITE(DSPFW3,
1329 (I915_READ(DSPFW3) | (cursor_sr << DSPFW_CURSOR_SR_SHIFT)));
1330 }
1331
1332 static void g4x_update_wm(struct drm_device *dev)
1333 {
1334 static const int sr_latency_ns = 12000;
1335 struct drm_i915_private *dev_priv = dev->dev_private;
1336 int planea_wm, planeb_wm, cursora_wm, cursorb_wm;
1337 int plane_sr, cursor_sr;
1338 unsigned int enabled = 0;
1339
1340 if (g4x_compute_wm0(dev, 0,
1341 &g4x_wm_info, latency_ns,
1342 &g4x_cursor_wm_info, latency_ns,
1343 &planea_wm, &cursora_wm))
1344 enabled |= 1;
1345
1346 if (g4x_compute_wm0(dev, 1,
1347 &g4x_wm_info, latency_ns,
1348 &g4x_cursor_wm_info, latency_ns,
1349 &planeb_wm, &cursorb_wm))
1350 enabled |= 2;
1351
1352 plane_sr = cursor_sr = 0;
1353 if (single_plane_enabled(enabled) &&
1354 g4x_compute_srwm(dev, ffs(enabled) - 1,
1355 sr_latency_ns,
1356 &g4x_wm_info,
1357 &g4x_cursor_wm_info,
1358 &plane_sr, &cursor_sr))
1359 I915_WRITE(FW_BLC_SELF, FW_BLC_SELF_EN);
1360 else
1361 I915_WRITE(FW_BLC_SELF,
1362 I915_READ(FW_BLC_SELF) & ~FW_BLC_SELF_EN);
1363
1364 DRM_DEBUG_KMS("Setting FIFO watermarks - A: plane=%d, cursor=%d, B: plane=%d, cursor=%d, SR: plane=%d, cursor=%d\n",
1365 planea_wm, cursora_wm,
1366 planeb_wm, cursorb_wm,
1367 plane_sr, cursor_sr);
1368
1369 I915_WRITE(DSPFW1,
1370 (plane_sr << DSPFW_SR_SHIFT) |
1371 (cursorb_wm << DSPFW_CURSORB_SHIFT) |
1372 (planeb_wm << DSPFW_PLANEB_SHIFT) |
1373 planea_wm);
1374 I915_WRITE(DSPFW2,
1375 (I915_READ(DSPFW2) & DSPFW_CURSORA_MASK) |
1376 (cursora_wm << DSPFW_CURSORA_SHIFT));
1377 /* HPLL off in SR has some issues on G4x... disable it */
1378 I915_WRITE(DSPFW3,
1379 (I915_READ(DSPFW3) & ~DSPFW_HPLL_SR_EN) |
1380 (cursor_sr << DSPFW_CURSOR_SR_SHIFT));
1381 }
1382
1383 static void i965_update_wm(struct drm_device *dev)
1384 {
1385 struct drm_i915_private *dev_priv = dev->dev_private;
1386 struct drm_crtc *crtc;
1387 int srwm = 1;
1388 int cursor_sr = 16;
1389
1390 /* Calc sr entries for one plane configs */
1391 crtc = single_enabled_crtc(dev);
1392 if (crtc) {
1393 /* self-refresh has much higher latency */
1394 static const int sr_latency_ns = 12000;
1395 int clock = crtc->mode.clock;
1396 int htotal = crtc->mode.htotal;
1397 int hdisplay = crtc->mode.hdisplay;
1398 int pixel_size = crtc->fb->bits_per_pixel / 8;
1399 unsigned long line_time_us;
1400 int entries;
1401
1402 line_time_us = ((htotal * 1000) / clock);
1403
1404 /* Use ns/us then divide to preserve precision */
1405 entries = (((sr_latency_ns / line_time_us) + 1000) / 1000) *
1406 pixel_size * hdisplay;
1407 entries = DIV_ROUND_UP(entries, I915_FIFO_LINE_SIZE);
1408 srwm = I965_FIFO_SIZE - entries;
1409 if (srwm < 0)
1410 srwm = 1;
1411 srwm &= 0x1ff;
1412 DRM_DEBUG_KMS("self-refresh entries: %d, wm: %d\n",
1413 entries, srwm);
1414
1415 entries = (((sr_latency_ns / line_time_us) + 1000) / 1000) *
1416 pixel_size * 64;
1417 entries = DIV_ROUND_UP(entries,
1418 i965_cursor_wm_info.cacheline_size);
1419 cursor_sr = i965_cursor_wm_info.fifo_size -
1420 (entries + i965_cursor_wm_info.guard_size);
1421
1422 if (cursor_sr > i965_cursor_wm_info.max_wm)
1423 cursor_sr = i965_cursor_wm_info.max_wm;
1424
1425 DRM_DEBUG_KMS("self-refresh watermark: display plane %d "
1426 "cursor %d\n", srwm, cursor_sr);
1427
1428 if (IS_CRESTLINE(dev))
1429 I915_WRITE(FW_BLC_SELF, FW_BLC_SELF_EN);
1430 } else {
1431 /* Turn off self refresh if both pipes are enabled */
1432 if (IS_CRESTLINE(dev))
1433 I915_WRITE(FW_BLC_SELF, I915_READ(FW_BLC_SELF)
1434 & ~FW_BLC_SELF_EN);
1435 }
1436
1437 DRM_DEBUG_KMS("Setting FIFO watermarks - A: 8, B: 8, C: 8, SR %d\n",
1438 srwm);
1439
1440 /* 965 has limitations... */
1441 I915_WRITE(DSPFW1, (srwm << DSPFW_SR_SHIFT) |
1442 (8 << 16) | (8 << 8) | (8 << 0));
1443 I915_WRITE(DSPFW2, (8 << 8) | (8 << 0));
1444 /* update cursor SR watermark */
1445 I915_WRITE(DSPFW3, (cursor_sr << DSPFW_CURSOR_SR_SHIFT));
1446 }
1447
1448 static void i9xx_update_wm(struct drm_device *dev)
1449 {
1450 struct drm_i915_private *dev_priv = dev->dev_private;
1451 const struct intel_watermark_params *wm_info;
1452 uint32_t fwater_lo;
1453 uint32_t fwater_hi;
1454 int cwm, srwm = 1;
1455 int fifo_size;
1456 int planea_wm, planeb_wm;
1457 struct drm_crtc *crtc, *enabled = NULL;
1458
1459 if (IS_I945GM(dev))
1460 wm_info = &i945_wm_info;
1461 else if (!IS_GEN2(dev))
1462 wm_info = &i915_wm_info;
1463 else
1464 wm_info = &i855_wm_info;
1465
1466 fifo_size = dev_priv->display.get_fifo_size(dev, 0);
1467 crtc = intel_get_crtc_for_plane(dev, 0);
1468 if (crtc->enabled && crtc->fb) {
1469 planea_wm = intel_calculate_wm(crtc->mode.clock,
1470 wm_info, fifo_size,
1471 crtc->fb->bits_per_pixel / 8,
1472 latency_ns);
1473 enabled = crtc;
1474 } else
1475 planea_wm = fifo_size - wm_info->guard_size;
1476
1477 fifo_size = dev_priv->display.get_fifo_size(dev, 1);
1478 crtc = intel_get_crtc_for_plane(dev, 1);
1479 if (crtc->enabled && crtc->fb) {
1480 planeb_wm = intel_calculate_wm(crtc->mode.clock,
1481 wm_info, fifo_size,
1482 crtc->fb->bits_per_pixel / 8,
1483 latency_ns);
1484 if (enabled == NULL)
1485 enabled = crtc;
1486 else
1487 enabled = NULL;
1488 } else
1489 planeb_wm = fifo_size - wm_info->guard_size;
1490
1491 DRM_DEBUG_KMS("FIFO watermarks - A: %d, B: %d\n", planea_wm, planeb_wm);
1492
1493 /*
1494 * Overlay gets an aggressive default since video jitter is bad.
1495 */
1496 cwm = 2;
1497
1498 /* Play safe and disable self-refresh before adjusting watermarks. */
1499 if (IS_I945G(dev) || IS_I945GM(dev))
1500 I915_WRITE(FW_BLC_SELF, FW_BLC_SELF_EN_MASK | 0);
1501 else if (IS_I915GM(dev))
1502 I915_WRITE(INSTPM, I915_READ(INSTPM) & ~INSTPM_SELF_EN);
1503
1504 /* Calc sr entries for one plane configs */
1505 if (HAS_FW_BLC(dev) && enabled) {
1506 /* self-refresh has much higher latency */
1507 static const int sr_latency_ns = 6000;
1508 int clock = enabled->mode.clock;
1509 int htotal = enabled->mode.htotal;
1510 int hdisplay = enabled->mode.hdisplay;
1511 int pixel_size = enabled->fb->bits_per_pixel / 8;
1512 unsigned long line_time_us;
1513 int entries;
1514
1515 line_time_us = (htotal * 1000) / clock;
1516
1517 /* Use ns/us then divide to preserve precision */
1518 entries = (((sr_latency_ns / line_time_us) + 1000) / 1000) *
1519 pixel_size * hdisplay;
1520 entries = DIV_ROUND_UP(entries, wm_info->cacheline_size);
1521 DRM_DEBUG_KMS("self-refresh entries: %d\n", entries);
1522 srwm = wm_info->fifo_size - entries;
1523 if (srwm < 0)
1524 srwm = 1;
1525
1526 if (IS_I945G(dev) || IS_I945GM(dev))
1527 I915_WRITE(FW_BLC_SELF,
1528 FW_BLC_SELF_FIFO_MASK | (srwm & 0xff));
1529 else if (IS_I915GM(dev))
1530 I915_WRITE(FW_BLC_SELF, srwm & 0x3f);
1531 }
1532
1533 DRM_DEBUG_KMS("Setting FIFO watermarks - A: %d, B: %d, C: %d, SR %d\n",
1534 planea_wm, planeb_wm, cwm, srwm);
1535
1536 fwater_lo = ((planeb_wm & 0x3f) << 16) | (planea_wm & 0x3f);
1537 fwater_hi = (cwm & 0x1f);
1538
1539 /* Set request length to 8 cachelines per fetch */
1540 fwater_lo = fwater_lo | (1 << 24) | (1 << 8);
1541 fwater_hi = fwater_hi | (1 << 8);
1542
1543 I915_WRITE(FW_BLC, fwater_lo);
1544 I915_WRITE(FW_BLC2, fwater_hi);
1545
1546 if (HAS_FW_BLC(dev)) {
1547 if (enabled) {
1548 if (IS_I945G(dev) || IS_I945GM(dev))
1549 I915_WRITE(FW_BLC_SELF,
1550 FW_BLC_SELF_EN_MASK | FW_BLC_SELF_EN);
1551 else if (IS_I915GM(dev))
1552 I915_WRITE(INSTPM, I915_READ(INSTPM) | INSTPM_SELF_EN);
1553 DRM_DEBUG_KMS("memory self refresh enabled\n");
1554 } else
1555 DRM_DEBUG_KMS("memory self refresh disabled\n");
1556 }
1557 }
1558
1559 static void i830_update_wm(struct drm_device *dev)
1560 {
1561 struct drm_i915_private *dev_priv = dev->dev_private;
1562 struct drm_crtc *crtc;
1563 uint32_t fwater_lo;
1564 int planea_wm;
1565
1566 crtc = single_enabled_crtc(dev);
1567 if (crtc == NULL)
1568 return;
1569
1570 planea_wm = intel_calculate_wm(crtc->mode.clock, &i830_wm_info,
1571 dev_priv->display.get_fifo_size(dev, 0),
1572 crtc->fb->bits_per_pixel / 8,
1573 latency_ns);
1574 fwater_lo = I915_READ(FW_BLC) & ~0xfff;
1575 fwater_lo |= (3<<8) | planea_wm;
1576
1577 DRM_DEBUG_KMS("Setting FIFO watermarks - A: %d\n", planea_wm);
1578
1579 I915_WRITE(FW_BLC, fwater_lo);
1580 }
1581
1582 #define ILK_LP0_PLANE_LATENCY 700
1583 #define ILK_LP0_CURSOR_LATENCY 1300
1584
1585 /*
1586 * Check the wm result.
1587 *
1588 * If any calculated watermark values is larger than the maximum value that
1589 * can be programmed into the associated watermark register, that watermark
1590 * must be disabled.
1591 */
1592 static bool ironlake_check_srwm(struct drm_device *dev, int level,
1593 int fbc_wm, int display_wm, int cursor_wm,
1594 const struct intel_watermark_params *display,
1595 const struct intel_watermark_params *cursor)
1596 {
1597 struct drm_i915_private *dev_priv = dev->dev_private;
1598
1599 DRM_DEBUG_KMS("watermark %d: display plane %d, fbc lines %d,"
1600 " cursor %d\n", level, display_wm, fbc_wm, cursor_wm);
1601
1602 if (fbc_wm > SNB_FBC_MAX_SRWM) {
1603 DRM_DEBUG_KMS("fbc watermark(%d) is too large(%d), disabling wm%d+\n",
1604 fbc_wm, SNB_FBC_MAX_SRWM, level);
1605
1606 /* fbc has it's own way to disable FBC WM */
1607 I915_WRITE(DISP_ARB_CTL,
1608 I915_READ(DISP_ARB_CTL) | DISP_FBC_WM_DIS);
1609 return false;
1610 }
1611
1612 if (display_wm > display->max_wm) {
1613 DRM_DEBUG_KMS("display watermark(%d) is too large(%d), disabling wm%d+\n",
1614 display_wm, SNB_DISPLAY_MAX_SRWM, level);
1615 return false;
1616 }
1617
1618 if (cursor_wm > cursor->max_wm) {
1619 DRM_DEBUG_KMS("cursor watermark(%d) is too large(%d), disabling wm%d+\n",
1620 cursor_wm, SNB_CURSOR_MAX_SRWM, level);
1621 return false;
1622 }
1623
1624 if (!(fbc_wm || display_wm || cursor_wm)) {
1625 DRM_DEBUG_KMS("latency %d is 0, disabling wm%d+\n", level, level);
1626 return false;
1627 }
1628
1629 return true;
1630 }
1631
1632 /*
1633 * Compute watermark values of WM[1-3],
1634 */
1635 static bool ironlake_compute_srwm(struct drm_device *dev, int level, int plane,
1636 int latency_ns,
1637 const struct intel_watermark_params *display,
1638 const struct intel_watermark_params *cursor,
1639 int *fbc_wm, int *display_wm, int *cursor_wm)
1640 {
1641 struct drm_crtc *crtc;
1642 unsigned long line_time_us;
1643 int hdisplay, htotal, pixel_size, clock;
1644 int line_count, line_size;
1645 int small, large;
1646 int entries;
1647
1648 if (!latency_ns) {
1649 *fbc_wm = *display_wm = *cursor_wm = 0;
1650 return false;
1651 }
1652
1653 crtc = intel_get_crtc_for_plane(dev, plane);
1654 hdisplay = crtc->mode.hdisplay;
1655 htotal = crtc->mode.htotal;
1656 clock = crtc->mode.clock;
1657 pixel_size = crtc->fb->bits_per_pixel / 8;
1658
1659 line_time_us = (htotal * 1000) / clock;
1660 line_count = (latency_ns / line_time_us + 1000) / 1000;
1661 line_size = hdisplay * pixel_size;
1662
1663 /* Use the minimum of the small and large buffer method for primary */
1664 small = ((clock * pixel_size / 1000) * latency_ns) / 1000;
1665 large = line_count * line_size;
1666
1667 entries = DIV_ROUND_UP(min(small, large), display->cacheline_size);
1668 *display_wm = entries + display->guard_size;
1669
1670 /*
1671 * Spec says:
1672 * FBC WM = ((Final Primary WM * 64) / number of bytes per line) + 2
1673 */
1674 *fbc_wm = DIV_ROUND_UP(*display_wm * 64, line_size) + 2;
1675
1676 /* calculate the self-refresh watermark for display cursor */
1677 entries = line_count * pixel_size * 64;
1678 entries = DIV_ROUND_UP(entries, cursor->cacheline_size);
1679 *cursor_wm = entries + cursor->guard_size;
1680
1681 return ironlake_check_srwm(dev, level,
1682 *fbc_wm, *display_wm, *cursor_wm,
1683 display, cursor);
1684 }
1685
1686 static void ironlake_update_wm(struct drm_device *dev)
1687 {
1688 struct drm_i915_private *dev_priv = dev->dev_private;
1689 int fbc_wm, plane_wm, cursor_wm;
1690 unsigned int enabled;
1691
1692 enabled = 0;
1693 if (g4x_compute_wm0(dev, 0,
1694 &ironlake_display_wm_info,
1695 ILK_LP0_PLANE_LATENCY,
1696 &ironlake_cursor_wm_info,
1697 ILK_LP0_CURSOR_LATENCY,
1698 &plane_wm, &cursor_wm)) {
1699 I915_WRITE(WM0_PIPEA_ILK,
1700 (plane_wm << WM0_PIPE_PLANE_SHIFT) | cursor_wm);
1701 DRM_DEBUG_KMS("FIFO watermarks For pipe A -"
1702 " plane %d, " "cursor: %d\n",
1703 plane_wm, cursor_wm);
1704 enabled |= 1;
1705 }
1706
1707 if (g4x_compute_wm0(dev, 1,
1708 &ironlake_display_wm_info,
1709 ILK_LP0_PLANE_LATENCY,
1710 &ironlake_cursor_wm_info,
1711 ILK_LP0_CURSOR_LATENCY,
1712 &plane_wm, &cursor_wm)) {
1713 I915_WRITE(WM0_PIPEB_ILK,
1714 (plane_wm << WM0_PIPE_PLANE_SHIFT) | cursor_wm);
1715 DRM_DEBUG_KMS("FIFO watermarks For pipe B -"
1716 " plane %d, cursor: %d\n",
1717 plane_wm, cursor_wm);
1718 enabled |= 2;
1719 }
1720
1721 /*
1722 * Calculate and update the self-refresh watermark only when one
1723 * display plane is used.
1724 */
1725 I915_WRITE(WM3_LP_ILK, 0);
1726 I915_WRITE(WM2_LP_ILK, 0);
1727 I915_WRITE(WM1_LP_ILK, 0);
1728
1729 if (!single_plane_enabled(enabled))
1730 return;
1731 enabled = ffs(enabled) - 1;
1732
1733 /* WM1 */
1734 if (!ironlake_compute_srwm(dev, 1, enabled,
1735 ILK_READ_WM1_LATENCY() * 500,
1736 &ironlake_display_srwm_info,
1737 &ironlake_cursor_srwm_info,
1738 &fbc_wm, &plane_wm, &cursor_wm))
1739 return;
1740
1741 I915_WRITE(WM1_LP_ILK,
1742 WM1_LP_SR_EN |
1743 (ILK_READ_WM1_LATENCY() << WM1_LP_LATENCY_SHIFT) |
1744 (fbc_wm << WM1_LP_FBC_SHIFT) |
1745 (plane_wm << WM1_LP_SR_SHIFT) |
1746 cursor_wm);
1747
1748 /* WM2 */
1749 if (!ironlake_compute_srwm(dev, 2, enabled,
1750 ILK_READ_WM2_LATENCY() * 500,
1751 &ironlake_display_srwm_info,
1752 &ironlake_cursor_srwm_info,
1753 &fbc_wm, &plane_wm, &cursor_wm))
1754 return;
1755
1756 I915_WRITE(WM2_LP_ILK,
1757 WM2_LP_EN |
1758 (ILK_READ_WM2_LATENCY() << WM1_LP_LATENCY_SHIFT) |
1759 (fbc_wm << WM1_LP_FBC_SHIFT) |
1760 (plane_wm << WM1_LP_SR_SHIFT) |
1761 cursor_wm);
1762
1763 /*
1764 * WM3 is unsupported on ILK, probably because we don't have latency
1765 * data for that power state
1766 */
1767 }
1768
1769 static void sandybridge_update_wm(struct drm_device *dev)
1770 {
1771 struct drm_i915_private *dev_priv = dev->dev_private;
1772 int latency = SNB_READ_WM0_LATENCY() * 100; /* In unit 0.1us */
1773 u32 val;
1774 int fbc_wm, plane_wm, cursor_wm;
1775 unsigned int enabled;
1776
1777 enabled = 0;
1778 if (g4x_compute_wm0(dev, 0,
1779 &sandybridge_display_wm_info, latency,
1780 &sandybridge_cursor_wm_info, latency,
1781 &plane_wm, &cursor_wm)) {
1782 val = I915_READ(WM0_PIPEA_ILK);
1783 val &= ~(WM0_PIPE_PLANE_MASK | WM0_PIPE_CURSOR_MASK);
1784 I915_WRITE(WM0_PIPEA_ILK, val |
1785 ((plane_wm << WM0_PIPE_PLANE_SHIFT) | cursor_wm));
1786 DRM_DEBUG_KMS("FIFO watermarks For pipe A -"
1787 " plane %d, " "cursor: %d\n",
1788 plane_wm, cursor_wm);
1789 enabled |= 1;
1790 }
1791
1792 if (g4x_compute_wm0(dev, 1,
1793 &sandybridge_display_wm_info, latency,
1794 &sandybridge_cursor_wm_info, latency,
1795 &plane_wm, &cursor_wm)) {
1796 val = I915_READ(WM0_PIPEB_ILK);
1797 val &= ~(WM0_PIPE_PLANE_MASK | WM0_PIPE_CURSOR_MASK);
1798 I915_WRITE(WM0_PIPEB_ILK, val |
1799 ((plane_wm << WM0_PIPE_PLANE_SHIFT) | cursor_wm));
1800 DRM_DEBUG_KMS("FIFO watermarks For pipe B -"
1801 " plane %d, cursor: %d\n",
1802 plane_wm, cursor_wm);
1803 enabled |= 2;
1804 }
1805
1806 if ((dev_priv->num_pipe == 3) &&
1807 g4x_compute_wm0(dev, 2,
1808 &sandybridge_display_wm_info, latency,
1809 &sandybridge_cursor_wm_info, latency,
1810 &plane_wm, &cursor_wm)) {
1811 val = I915_READ(WM0_PIPEC_IVB);
1812 val &= ~(WM0_PIPE_PLANE_MASK | WM0_PIPE_CURSOR_MASK);
1813 I915_WRITE(WM0_PIPEC_IVB, val |
1814 ((plane_wm << WM0_PIPE_PLANE_SHIFT) | cursor_wm));
1815 DRM_DEBUG_KMS("FIFO watermarks For pipe C -"
1816 " plane %d, cursor: %d\n",
1817 plane_wm, cursor_wm);
1818 enabled |= 3;
1819 }
1820
1821 /*
1822 * Calculate and update the self-refresh watermark only when one
1823 * display plane is used.
1824 *
1825 * SNB support 3 levels of watermark.
1826 *
1827 * WM1/WM2/WM2 watermarks have to be enabled in the ascending order,
1828 * and disabled in the descending order
1829 *
1830 */
1831 I915_WRITE(WM3_LP_ILK, 0);
1832 I915_WRITE(WM2_LP_ILK, 0);
1833 I915_WRITE(WM1_LP_ILK, 0);
1834
1835 if (!single_plane_enabled(enabled) ||
1836 dev_priv->sprite_scaling_enabled)
1837 return;
1838 enabled = ffs(enabled) - 1;
1839
1840 /* WM1 */
1841 if (!ironlake_compute_srwm(dev, 1, enabled,
1842 SNB_READ_WM1_LATENCY() * 500,
1843 &sandybridge_display_srwm_info,
1844 &sandybridge_cursor_srwm_info,
1845 &fbc_wm, &plane_wm, &cursor_wm))
1846 return;
1847
1848 I915_WRITE(WM1_LP_ILK,
1849 WM1_LP_SR_EN |
1850 (SNB_READ_WM1_LATENCY() << WM1_LP_LATENCY_SHIFT) |
1851 (fbc_wm << WM1_LP_FBC_SHIFT) |
1852 (plane_wm << WM1_LP_SR_SHIFT) |
1853 cursor_wm);
1854
1855 /* WM2 */
1856 if (!ironlake_compute_srwm(dev, 2, enabled,
1857 SNB_READ_WM2_LATENCY() * 500,
1858 &sandybridge_display_srwm_info,
1859 &sandybridge_cursor_srwm_info,
1860 &fbc_wm, &plane_wm, &cursor_wm))
1861 return;
1862
1863 I915_WRITE(WM2_LP_ILK,
1864 WM2_LP_EN |
1865 (SNB_READ_WM2_LATENCY() << WM1_LP_LATENCY_SHIFT) |
1866 (fbc_wm << WM1_LP_FBC_SHIFT) |
1867 (plane_wm << WM1_LP_SR_SHIFT) |
1868 cursor_wm);
1869
1870 /* WM3 */
1871 if (!ironlake_compute_srwm(dev, 3, enabled,
1872 SNB_READ_WM3_LATENCY() * 500,
1873 &sandybridge_display_srwm_info,
1874 &sandybridge_cursor_srwm_info,
1875 &fbc_wm, &plane_wm, &cursor_wm))
1876 return;
1877
1878 I915_WRITE(WM3_LP_ILK,
1879 WM3_LP_EN |
1880 (SNB_READ_WM3_LATENCY() << WM1_LP_LATENCY_SHIFT) |
1881 (fbc_wm << WM1_LP_FBC_SHIFT) |
1882 (plane_wm << WM1_LP_SR_SHIFT) |
1883 cursor_wm);
1884 }
1885
1886 static void
1887 haswell_update_linetime_wm(struct drm_device *dev, int pipe,
1888 struct drm_display_mode *mode)
1889 {
1890 struct drm_i915_private *dev_priv = dev->dev_private;
1891 u32 temp;
1892
1893 temp = I915_READ(PIPE_WM_LINETIME(pipe));
1894 temp &= ~PIPE_WM_LINETIME_MASK;
1895
1896 /* The WM are computed with base on how long it takes to fill a single
1897 * row at the given clock rate, multiplied by 8.
1898 * */
1899 temp |= PIPE_WM_LINETIME_TIME(
1900 ((mode->crtc_hdisplay * 1000) / mode->clock) * 8);
1901
1902 /* IPS watermarks are only used by pipe A, and are ignored by
1903 * pipes B and C. They are calculated similarly to the common
1904 * linetime values, except that we are using CD clock frequency
1905 * in MHz instead of pixel rate for the division.
1906 *
1907 * This is a placeholder for the IPS watermark calculation code.
1908 */
1909
1910 I915_WRITE(PIPE_WM_LINETIME(pipe), temp);
1911 }
1912
1913 static bool
1914 sandybridge_compute_sprite_wm(struct drm_device *dev, int plane,
1915 uint32_t sprite_width, int pixel_size,
1916 const struct intel_watermark_params *display,
1917 int display_latency_ns, int *sprite_wm)
1918 {
1919 struct drm_crtc *crtc;
1920 int clock;
1921 int entries, tlb_miss;
1922
1923 crtc = intel_get_crtc_for_plane(dev, plane);
1924 if (crtc->fb == NULL || !crtc->enabled) {
1925 *sprite_wm = display->guard_size;
1926 return false;
1927 }
1928
1929 clock = crtc->mode.clock;
1930
1931 /* Use the small buffer method to calculate the sprite watermark */
1932 entries = ((clock * pixel_size / 1000) * display_latency_ns) / 1000;
1933 tlb_miss = display->fifo_size*display->cacheline_size -
1934 sprite_width * 8;
1935 if (tlb_miss > 0)
1936 entries += tlb_miss;
1937 entries = DIV_ROUND_UP(entries, display->cacheline_size);
1938 *sprite_wm = entries + display->guard_size;
1939 if (*sprite_wm > (int)display->max_wm)
1940 *sprite_wm = display->max_wm;
1941
1942 return true;
1943 }
1944
1945 static bool
1946 sandybridge_compute_sprite_srwm(struct drm_device *dev, int plane,
1947 uint32_t sprite_width, int pixel_size,
1948 const struct intel_watermark_params *display,
1949 int latency_ns, int *sprite_wm)
1950 {
1951 struct drm_crtc *crtc;
1952 unsigned long line_time_us;
1953 int clock;
1954 int line_count, line_size;
1955 int small, large;
1956 int entries;
1957
1958 if (!latency_ns) {
1959 *sprite_wm = 0;
1960 return false;
1961 }
1962
1963 crtc = intel_get_crtc_for_plane(dev, plane);
1964 clock = crtc->mode.clock;
1965 if (!clock) {
1966 *sprite_wm = 0;
1967 return false;
1968 }
1969
1970 line_time_us = (sprite_width * 1000) / clock;
1971 if (!line_time_us) {
1972 *sprite_wm = 0;
1973 return false;
1974 }
1975
1976 line_count = (latency_ns / line_time_us + 1000) / 1000;
1977 line_size = sprite_width * pixel_size;
1978
1979 /* Use the minimum of the small and large buffer method for primary */
1980 small = ((clock * pixel_size / 1000) * latency_ns) / 1000;
1981 large = line_count * line_size;
1982
1983 entries = DIV_ROUND_UP(min(small, large), display->cacheline_size);
1984 *sprite_wm = entries + display->guard_size;
1985
1986 return *sprite_wm > 0x3ff ? false : true;
1987 }
1988
1989 static void sandybridge_update_sprite_wm(struct drm_device *dev, int pipe,
1990 uint32_t sprite_width, int pixel_size)
1991 {
1992 struct drm_i915_private *dev_priv = dev->dev_private;
1993 int latency = SNB_READ_WM0_LATENCY() * 100; /* In unit 0.1us */
1994 u32 val;
1995 int sprite_wm, reg;
1996 int ret;
1997
1998 switch (pipe) {
1999 case 0:
2000 reg = WM0_PIPEA_ILK;
2001 break;
2002 case 1:
2003 reg = WM0_PIPEB_ILK;
2004 break;
2005 case 2:
2006 reg = WM0_PIPEC_IVB;
2007 break;
2008 default:
2009 return; /* bad pipe */
2010 }
2011
2012 ret = sandybridge_compute_sprite_wm(dev, pipe, sprite_width, pixel_size,
2013 &sandybridge_display_wm_info,
2014 latency, &sprite_wm);
2015 if (!ret) {
2016 DRM_DEBUG_KMS("failed to compute sprite wm for pipe %d\n",
2017 pipe);
2018 return;
2019 }
2020
2021 val = I915_READ(reg);
2022 val &= ~WM0_PIPE_SPRITE_MASK;
2023 I915_WRITE(reg, val | (sprite_wm << WM0_PIPE_SPRITE_SHIFT));
2024 DRM_DEBUG_KMS("sprite watermarks For pipe %d - %d\n", pipe, sprite_wm);
2025
2026
2027 ret = sandybridge_compute_sprite_srwm(dev, pipe, sprite_width,
2028 pixel_size,
2029 &sandybridge_display_srwm_info,
2030 SNB_READ_WM1_LATENCY() * 500,
2031 &sprite_wm);
2032 if (!ret) {
2033 DRM_DEBUG_KMS("failed to compute sprite lp1 wm on pipe %d\n",
2034 pipe);
2035 return;
2036 }
2037 I915_WRITE(WM1S_LP_ILK, sprite_wm);
2038
2039 /* Only IVB has two more LP watermarks for sprite */
2040 if (!IS_IVYBRIDGE(dev))
2041 return;
2042
2043 ret = sandybridge_compute_sprite_srwm(dev, pipe, sprite_width,
2044 pixel_size,
2045 &sandybridge_display_srwm_info,
2046 SNB_READ_WM2_LATENCY() * 500,
2047 &sprite_wm);
2048 if (!ret) {
2049 DRM_DEBUG_KMS("failed to compute sprite lp2 wm on pipe %d\n",
2050 pipe);
2051 return;
2052 }
2053 I915_WRITE(WM2S_LP_IVB, sprite_wm);
2054
2055 ret = sandybridge_compute_sprite_srwm(dev, pipe, sprite_width,
2056 pixel_size,
2057 &sandybridge_display_srwm_info,
2058 SNB_READ_WM3_LATENCY() * 500,
2059 &sprite_wm);
2060 if (!ret) {
2061 DRM_DEBUG_KMS("failed to compute sprite lp3 wm on pipe %d\n",
2062 pipe);
2063 return;
2064 }
2065 I915_WRITE(WM3S_LP_IVB, sprite_wm);
2066 }
2067
2068 /**
2069 * intel_update_watermarks - update FIFO watermark values based on current modes
2070 *
2071 * Calculate watermark values for the various WM regs based on current mode
2072 * and plane configuration.
2073 *
2074 * There are several cases to deal with here:
2075 * - normal (i.e. non-self-refresh)
2076 * - self-refresh (SR) mode
2077 * - lines are large relative to FIFO size (buffer can hold up to 2)
2078 * - lines are small relative to FIFO size (buffer can hold more than 2
2079 * lines), so need to account for TLB latency
2080 *
2081 * The normal calculation is:
2082 * watermark = dotclock * bytes per pixel * latency
2083 * where latency is platform & configuration dependent (we assume pessimal
2084 * values here).
2085 *
2086 * The SR calculation is:
2087 * watermark = (trunc(latency/line time)+1) * surface width *
2088 * bytes per pixel
2089 * where
2090 * line time = htotal / dotclock
2091 * surface width = hdisplay for normal plane and 64 for cursor
2092 * and latency is assumed to be high, as above.
2093 *
2094 * The final value programmed to the register should always be rounded up,
2095 * and include an extra 2 entries to account for clock crossings.
2096 *
2097 * We don't use the sprite, so we can ignore that. And on Crestline we have
2098 * to set the non-SR watermarks to 8.
2099 */
2100 void intel_update_watermarks(struct drm_device *dev)
2101 {
2102 struct drm_i915_private *dev_priv = dev->dev_private;
2103
2104 if (dev_priv->display.update_wm)
2105 dev_priv->display.update_wm(dev);
2106 }
2107
2108 void intel_update_linetime_watermarks(struct drm_device *dev,
2109 int pipe, struct drm_display_mode *mode)
2110 {
2111 struct drm_i915_private *dev_priv = dev->dev_private;
2112
2113 if (dev_priv->display.update_linetime_wm)
2114 dev_priv->display.update_linetime_wm(dev, pipe, mode);
2115 }
2116
2117 void intel_update_sprite_watermarks(struct drm_device *dev, int pipe,
2118 uint32_t sprite_width, int pixel_size)
2119 {
2120 struct drm_i915_private *dev_priv = dev->dev_private;
2121
2122 if (dev_priv->display.update_sprite_wm)
2123 dev_priv->display.update_sprite_wm(dev, pipe, sprite_width,
2124 pixel_size);
2125 }
2126
2127 static struct drm_i915_gem_object *
2128 intel_alloc_context_page(struct drm_device *dev)
2129 {
2130 struct drm_i915_gem_object *ctx;
2131 int ret;
2132
2133 WARN_ON(!mutex_is_locked(&dev->struct_mutex));
2134
2135 ctx = i915_gem_alloc_object(dev, 4096);
2136 if (!ctx) {
2137 DRM_DEBUG("failed to alloc power context, RC6 disabled\n");
2138 return NULL;
2139 }
2140
2141 ret = i915_gem_object_pin(ctx, 4096, true);
2142 if (ret) {
2143 DRM_ERROR("failed to pin power context: %d\n", ret);
2144 goto err_unref;
2145 }
2146
2147 ret = i915_gem_object_set_to_gtt_domain(ctx, 1);
2148 if (ret) {
2149 DRM_ERROR("failed to set-domain on power context: %d\n", ret);
2150 goto err_unpin;
2151 }
2152
2153 return ctx;
2154
2155 err_unpin:
2156 i915_gem_object_unpin(ctx);
2157 err_unref:
2158 drm_gem_object_unreference(&ctx->base);
2159 mutex_unlock(&dev->struct_mutex);
2160 return NULL;
2161 }
2162
2163 bool ironlake_set_drps(struct drm_device *dev, u8 val)
2164 {
2165 struct drm_i915_private *dev_priv = dev->dev_private;
2166 u16 rgvswctl;
2167
2168 rgvswctl = I915_READ16(MEMSWCTL);
2169 if (rgvswctl & MEMCTL_CMD_STS) {
2170 DRM_DEBUG("gpu busy, RCS change rejected\n");
2171 return false; /* still busy with another command */
2172 }
2173
2174 rgvswctl = (MEMCTL_CMD_CHFREQ << MEMCTL_CMD_SHIFT) |
2175 (val << MEMCTL_FREQ_SHIFT) | MEMCTL_SFCAVM;
2176 I915_WRITE16(MEMSWCTL, rgvswctl);
2177 POSTING_READ16(MEMSWCTL);
2178
2179 rgvswctl |= MEMCTL_CMD_STS;
2180 I915_WRITE16(MEMSWCTL, rgvswctl);
2181
2182 return true;
2183 }
2184
2185 static void ironlake_enable_drps(struct drm_device *dev)
2186 {
2187 struct drm_i915_private *dev_priv = dev->dev_private;
2188 u32 rgvmodectl = I915_READ(MEMMODECTL);
2189 u8 fmax, fmin, fstart, vstart;
2190
2191 /* Enable temp reporting */
2192 I915_WRITE16(PMMISC, I915_READ(PMMISC) | MCPPCE_EN);
2193 I915_WRITE16(TSC1, I915_READ(TSC1) | TSE);
2194
2195 /* 100ms RC evaluation intervals */
2196 I915_WRITE(RCUPEI, 100000);
2197 I915_WRITE(RCDNEI, 100000);
2198
2199 /* Set max/min thresholds to 90ms and 80ms respectively */
2200 I915_WRITE(RCBMAXAVG, 90000);
2201 I915_WRITE(RCBMINAVG, 80000);
2202
2203 I915_WRITE(MEMIHYST, 1);
2204
2205 /* Set up min, max, and cur for interrupt handling */
2206 fmax = (rgvmodectl & MEMMODE_FMAX_MASK) >> MEMMODE_FMAX_SHIFT;
2207 fmin = (rgvmodectl & MEMMODE_FMIN_MASK);
2208 fstart = (rgvmodectl & MEMMODE_FSTART_MASK) >>
2209 MEMMODE_FSTART_SHIFT;
2210
2211 vstart = (I915_READ(PXVFREQ_BASE + (fstart * 4)) & PXVFREQ_PX_MASK) >>
2212 PXVFREQ_PX_SHIFT;
2213
2214 dev_priv->fmax = fmax; /* IPS callback will increase this */
2215 dev_priv->fstart = fstart;
2216
2217 dev_priv->max_delay = fstart;
2218 dev_priv->min_delay = fmin;
2219 dev_priv->cur_delay = fstart;
2220
2221 DRM_DEBUG_DRIVER("fmax: %d, fmin: %d, fstart: %d\n",
2222 fmax, fmin, fstart);
2223
2224 I915_WRITE(MEMINTREN, MEMINT_CX_SUPR_EN | MEMINT_EVAL_CHG_EN);
2225
2226 /*
2227 * Interrupts will be enabled in ironlake_irq_postinstall
2228 */
2229
2230 I915_WRITE(VIDSTART, vstart);
2231 POSTING_READ(VIDSTART);
2232
2233 rgvmodectl |= MEMMODE_SWMODE_EN;
2234 I915_WRITE(MEMMODECTL, rgvmodectl);
2235
2236 if (wait_for((I915_READ(MEMSWCTL) & MEMCTL_CMD_STS) == 0, 10))
2237 DRM_ERROR("stuck trying to change perf mode\n");
2238 msleep(1);
2239
2240 ironlake_set_drps(dev, fstart);
2241
2242 dev_priv->last_count1 = I915_READ(0x112e4) + I915_READ(0x112e8) +
2243 I915_READ(0x112e0);
2244 dev_priv->last_time1 = jiffies_to_msecs(jiffies);
2245 dev_priv->last_count2 = I915_READ(0x112f4);
2246 getrawmonotonic(&dev_priv->last_time2);
2247 }
2248
2249 static void ironlake_disable_drps(struct drm_device *dev)
2250 {
2251 struct drm_i915_private *dev_priv = dev->dev_private;
2252 u16 rgvswctl = I915_READ16(MEMSWCTL);
2253
2254 /* Ack interrupts, disable EFC interrupt */
2255 I915_WRITE(MEMINTREN, I915_READ(MEMINTREN) & ~MEMINT_EVAL_CHG_EN);
2256 I915_WRITE(MEMINTRSTS, MEMINT_EVAL_CHG);
2257 I915_WRITE(DEIER, I915_READ(DEIER) & ~DE_PCU_EVENT);
2258 I915_WRITE(DEIIR, DE_PCU_EVENT);
2259 I915_WRITE(DEIMR, I915_READ(DEIMR) | DE_PCU_EVENT);
2260
2261 /* Go back to the starting frequency */
2262 ironlake_set_drps(dev, dev_priv->fstart);
2263 msleep(1);
2264 rgvswctl |= MEMCTL_CMD_STS;
2265 I915_WRITE(MEMSWCTL, rgvswctl);
2266 msleep(1);
2267
2268 }
2269
2270 void gen6_set_rps(struct drm_device *dev, u8 val)
2271 {
2272 struct drm_i915_private *dev_priv = dev->dev_private;
2273 u32 limits;
2274
2275 limits = 0;
2276 if (val >= dev_priv->max_delay)
2277 val = dev_priv->max_delay;
2278 else
2279 limits |= dev_priv->max_delay << 24;
2280
2281 if (val <= dev_priv->min_delay)
2282 val = dev_priv->min_delay;
2283 else
2284 limits |= dev_priv->min_delay << 16;
2285
2286 if (val == dev_priv->cur_delay)
2287 return;
2288
2289 I915_WRITE(GEN6_RPNSWREQ,
2290 GEN6_FREQUENCY(val) |
2291 GEN6_OFFSET(0) |
2292 GEN6_AGGRESSIVE_TURBO);
2293
2294 /* Make sure we continue to get interrupts
2295 * until we hit the minimum or maximum frequencies.
2296 */
2297 I915_WRITE(GEN6_RP_INTERRUPT_LIMITS, limits);
2298
2299 dev_priv->cur_delay = val;
2300 }
2301
2302 static void gen6_disable_rps(struct drm_device *dev)
2303 {
2304 struct drm_i915_private *dev_priv = dev->dev_private;
2305
2306 I915_WRITE(GEN6_RC_CONTROL, 0);
2307 I915_WRITE(GEN6_RPNSWREQ, 1 << 31);
2308 I915_WRITE(GEN6_PMINTRMSK, 0xffffffff);
2309 I915_WRITE(GEN6_PMIER, 0);
2310 /* Complete PM interrupt masking here doesn't race with the rps work
2311 * item again unmasking PM interrupts because that is using a different
2312 * register (PMIMR) to mask PM interrupts. The only risk is in leaving
2313 * stale bits in PMIIR and PMIMR which gen6_enable_rps will clean up. */
2314
2315 spin_lock_irq(&dev_priv->rps_lock);
2316 dev_priv->pm_iir = 0;
2317 spin_unlock_irq(&dev_priv->rps_lock);
2318
2319 I915_WRITE(GEN6_PMIIR, I915_READ(GEN6_PMIIR));
2320 }
2321
2322 int intel_enable_rc6(const struct drm_device *dev)
2323 {
2324 /*
2325 * Respect the kernel parameter if it is set
2326 */
2327 if (i915_enable_rc6 >= 0)
2328 return i915_enable_rc6;
2329
2330 /*
2331 * Disable RC6 on Ironlake
2332 */
2333 if (INTEL_INFO(dev)->gen == 5)
2334 return 0;
2335
2336 /* On Haswell, only RC6 is available. So let's enable it by default to
2337 * provide better testing and coverage since the beginning.
2338 */
2339 if (IS_HASWELL(dev))
2340 return INTEL_RC6_ENABLE;
2341
2342 /*
2343 * Disable rc6 on Sandybridge
2344 */
2345 if (INTEL_INFO(dev)->gen == 6) {
2346 DRM_DEBUG_DRIVER("Sandybridge: deep RC6 disabled\n");
2347 return INTEL_RC6_ENABLE;
2348 }
2349 DRM_DEBUG_DRIVER("RC6 and deep RC6 enabled\n");
2350 return (INTEL_RC6_ENABLE | INTEL_RC6p_ENABLE);
2351 }
2352
2353 static void gen6_enable_rps(struct drm_device *dev)
2354 {
2355 struct drm_i915_private *dev_priv = dev->dev_private;
2356 struct intel_ring_buffer *ring;
2357 u32 rp_state_cap;
2358 u32 gt_perf_status;
2359 u32 pcu_mbox, rc6_mask = 0;
2360 u32 gtfifodbg;
2361 int rc6_mode;
2362 int i;
2363
2364 WARN_ON(!mutex_is_locked(&dev->struct_mutex));
2365
2366 /* Here begins a magic sequence of register writes to enable
2367 * auto-downclocking.
2368 *
2369 * Perhaps there might be some value in exposing these to
2370 * userspace...
2371 */
2372 I915_WRITE(GEN6_RC_STATE, 0);
2373
2374 /* Clear the DBG now so we don't confuse earlier errors */
2375 if ((gtfifodbg = I915_READ(GTFIFODBG))) {
2376 DRM_ERROR("GT fifo had a previous error %x\n", gtfifodbg);
2377 I915_WRITE(GTFIFODBG, gtfifodbg);
2378 }
2379
2380 gen6_gt_force_wake_get(dev_priv);
2381
2382 rp_state_cap = I915_READ(GEN6_RP_STATE_CAP);
2383 gt_perf_status = I915_READ(GEN6_GT_PERF_STATUS);
2384
2385 /* In units of 100MHz */
2386 dev_priv->max_delay = rp_state_cap & 0xff;
2387 dev_priv->min_delay = (rp_state_cap & 0xff0000) >> 16;
2388 dev_priv->cur_delay = 0;
2389
2390 /* disable the counters and set deterministic thresholds */
2391 I915_WRITE(GEN6_RC_CONTROL, 0);
2392
2393 I915_WRITE(GEN6_RC1_WAKE_RATE_LIMIT, 1000 << 16);
2394 I915_WRITE(GEN6_RC6_WAKE_RATE_LIMIT, 40 << 16 | 30);
2395 I915_WRITE(GEN6_RC6pp_WAKE_RATE_LIMIT, 30);
2396 I915_WRITE(GEN6_RC_EVALUATION_INTERVAL, 125000);
2397 I915_WRITE(GEN6_RC_IDLE_HYSTERSIS, 25);
2398
2399 for_each_ring(ring, dev_priv, i)
2400 I915_WRITE(RING_MAX_IDLE(ring->mmio_base), 10);
2401
2402 I915_WRITE(GEN6_RC_SLEEP, 0);
2403 I915_WRITE(GEN6_RC1e_THRESHOLD, 1000);
2404 I915_WRITE(GEN6_RC6_THRESHOLD, 50000);
2405 I915_WRITE(GEN6_RC6p_THRESHOLD, 100000);
2406 I915_WRITE(GEN6_RC6pp_THRESHOLD, 64000); /* unused */
2407
2408 /* Check if we are enabling RC6 */
2409 rc6_mode = intel_enable_rc6(dev_priv->dev);
2410 if (rc6_mode & INTEL_RC6_ENABLE)
2411 rc6_mask |= GEN6_RC_CTL_RC6_ENABLE;
2412
2413 /* We don't use those on Haswell */
2414 if (!IS_HASWELL(dev)) {
2415 if (rc6_mode & INTEL_RC6p_ENABLE)
2416 rc6_mask |= GEN6_RC_CTL_RC6p_ENABLE;
2417
2418 if (rc6_mode & INTEL_RC6pp_ENABLE)
2419 rc6_mask |= GEN6_RC_CTL_RC6pp_ENABLE;
2420 }
2421
2422 DRM_INFO("Enabling RC6 states: RC6 %s, RC6p %s, RC6pp %s\n",
2423 (rc6_mask & GEN6_RC_CTL_RC6_ENABLE) ? "on" : "off",
2424 (rc6_mask & GEN6_RC_CTL_RC6p_ENABLE) ? "on" : "off",
2425 (rc6_mask & GEN6_RC_CTL_RC6pp_ENABLE) ? "on" : "off");
2426
2427 I915_WRITE(GEN6_RC_CONTROL,
2428 rc6_mask |
2429 GEN6_RC_CTL_EI_MODE(1) |
2430 GEN6_RC_CTL_HW_ENABLE);
2431
2432 I915_WRITE(GEN6_RPNSWREQ,
2433 GEN6_FREQUENCY(10) |
2434 GEN6_OFFSET(0) |
2435 GEN6_AGGRESSIVE_TURBO);
2436 I915_WRITE(GEN6_RC_VIDEO_FREQ,
2437 GEN6_FREQUENCY(12));
2438
2439 I915_WRITE(GEN6_RP_DOWN_TIMEOUT, 1000000);
2440 I915_WRITE(GEN6_RP_INTERRUPT_LIMITS,
2441 dev_priv->max_delay << 24 |
2442 dev_priv->min_delay << 16);
2443
2444 I915_WRITE(GEN6_RP_UP_THRESHOLD, 59400);
2445 I915_WRITE(GEN6_RP_DOWN_THRESHOLD, 245000);
2446 I915_WRITE(GEN6_RP_UP_EI, 66000);
2447 I915_WRITE(GEN6_RP_DOWN_EI, 350000);
2448
2449 I915_WRITE(GEN6_RP_IDLE_HYSTERSIS, 10);
2450 I915_WRITE(GEN6_RP_CONTROL,
2451 GEN6_RP_MEDIA_TURBO |
2452 GEN6_RP_MEDIA_HW_NORMAL_MODE |
2453 GEN6_RP_MEDIA_IS_GFX |
2454 GEN6_RP_ENABLE |
2455 GEN6_RP_UP_BUSY_AVG |
2456 (IS_HASWELL(dev) ? GEN7_RP_DOWN_IDLE_AVG : GEN6_RP_DOWN_IDLE_CONT));
2457
2458 if (wait_for((I915_READ(GEN6_PCODE_MAILBOX) & GEN6_PCODE_READY) == 0,
2459 500))
2460 DRM_ERROR("timeout waiting for pcode mailbox to become idle\n");
2461
2462 I915_WRITE(GEN6_PCODE_DATA, 0);
2463 I915_WRITE(GEN6_PCODE_MAILBOX,
2464 GEN6_PCODE_READY |
2465 GEN6_PCODE_WRITE_MIN_FREQ_TABLE);
2466 if (wait_for((I915_READ(GEN6_PCODE_MAILBOX) & GEN6_PCODE_READY) == 0,
2467 500))
2468 DRM_ERROR("timeout waiting for pcode mailbox to finish\n");
2469
2470 /* Check for overclock support */
2471 if (wait_for((I915_READ(GEN6_PCODE_MAILBOX) & GEN6_PCODE_READY) == 0,
2472 500))
2473 DRM_ERROR("timeout waiting for pcode mailbox to become idle\n");
2474 I915_WRITE(GEN6_PCODE_MAILBOX, GEN6_READ_OC_PARAMS);
2475 pcu_mbox = I915_READ(GEN6_PCODE_DATA);
2476 if (wait_for((I915_READ(GEN6_PCODE_MAILBOX) & GEN6_PCODE_READY) == 0,
2477 500))
2478 DRM_ERROR("timeout waiting for pcode mailbox to finish\n");
2479 if (pcu_mbox & (1<<31)) { /* OC supported */
2480 dev_priv->max_delay = pcu_mbox & 0xff;
2481 DRM_DEBUG_DRIVER("overclocking supported, adjusting frequency max to %dMHz\n", pcu_mbox * 50);
2482 }
2483
2484 gen6_set_rps(dev_priv->dev, (gt_perf_status & 0xff00) >> 8);
2485
2486 /* requires MSI enabled */
2487 I915_WRITE(GEN6_PMIER, GEN6_PM_DEFERRED_EVENTS);
2488 spin_lock_irq(&dev_priv->rps_lock);
2489 WARN_ON(dev_priv->pm_iir != 0);
2490 I915_WRITE(GEN6_PMIMR, 0);
2491 spin_unlock_irq(&dev_priv->rps_lock);
2492 /* enable all PM interrupts */
2493 I915_WRITE(GEN6_PMINTRMSK, 0);
2494
2495 gen6_gt_force_wake_put(dev_priv);
2496 }
2497
2498 static void gen6_update_ring_freq(struct drm_device *dev)
2499 {
2500 struct drm_i915_private *dev_priv = dev->dev_private;
2501 int min_freq = 15;
2502 int gpu_freq, ia_freq, max_ia_freq;
2503 int scaling_factor = 180;
2504
2505 WARN_ON(!mutex_is_locked(&dev->struct_mutex));
2506
2507 max_ia_freq = cpufreq_quick_get_max(0);
2508 /*
2509 * Default to measured freq if none found, PCU will ensure we don't go
2510 * over
2511 */
2512 if (!max_ia_freq)
2513 max_ia_freq = tsc_khz;
2514
2515 /* Convert from kHz to MHz */
2516 max_ia_freq /= 1000;
2517
2518 /*
2519 * For each potential GPU frequency, load a ring frequency we'd like
2520 * to use for memory access. We do this by specifying the IA frequency
2521 * the PCU should use as a reference to determine the ring frequency.
2522 */
2523 for (gpu_freq = dev_priv->max_delay; gpu_freq >= dev_priv->min_delay;
2524 gpu_freq--) {
2525 int diff = dev_priv->max_delay - gpu_freq;
2526
2527 /*
2528 * For GPU frequencies less than 750MHz, just use the lowest
2529 * ring freq.
2530 */
2531 if (gpu_freq < min_freq)
2532 ia_freq = 800;
2533 else
2534 ia_freq = max_ia_freq - ((diff * scaling_factor) / 2);
2535 ia_freq = DIV_ROUND_CLOSEST(ia_freq, 100);
2536
2537 I915_WRITE(GEN6_PCODE_DATA,
2538 (ia_freq << GEN6_PCODE_FREQ_IA_RATIO_SHIFT) |
2539 gpu_freq);
2540 I915_WRITE(GEN6_PCODE_MAILBOX, GEN6_PCODE_READY |
2541 GEN6_PCODE_WRITE_MIN_FREQ_TABLE);
2542 if (wait_for((I915_READ(GEN6_PCODE_MAILBOX) &
2543 GEN6_PCODE_READY) == 0, 10)) {
2544 DRM_ERROR("pcode write of freq table timed out\n");
2545 continue;
2546 }
2547 }
2548 }
2549
2550 void ironlake_teardown_rc6(struct drm_device *dev)
2551 {
2552 struct drm_i915_private *dev_priv = dev->dev_private;
2553
2554 if (dev_priv->renderctx) {
2555 i915_gem_object_unpin(dev_priv->renderctx);
2556 drm_gem_object_unreference(&dev_priv->renderctx->base);
2557 dev_priv->renderctx = NULL;
2558 }
2559
2560 if (dev_priv->pwrctx) {
2561 i915_gem_object_unpin(dev_priv->pwrctx);
2562 drm_gem_object_unreference(&dev_priv->pwrctx->base);
2563 dev_priv->pwrctx = NULL;
2564 }
2565 }
2566
2567 static void ironlake_disable_rc6(struct drm_device *dev)
2568 {
2569 struct drm_i915_private *dev_priv = dev->dev_private;
2570
2571 if (I915_READ(PWRCTXA)) {
2572 /* Wake the GPU, prevent RC6, then restore RSTDBYCTL */
2573 I915_WRITE(RSTDBYCTL, I915_READ(RSTDBYCTL) | RCX_SW_EXIT);
2574 wait_for(((I915_READ(RSTDBYCTL) & RSX_STATUS_MASK) == RSX_STATUS_ON),
2575 50);
2576
2577 I915_WRITE(PWRCTXA, 0);
2578 POSTING_READ(PWRCTXA);
2579
2580 I915_WRITE(RSTDBYCTL, I915_READ(RSTDBYCTL) & ~RCX_SW_EXIT);
2581 POSTING_READ(RSTDBYCTL);
2582 }
2583 }
2584
2585 static int ironlake_setup_rc6(struct drm_device *dev)
2586 {
2587 struct drm_i915_private *dev_priv = dev->dev_private;
2588
2589 if (dev_priv->renderctx == NULL)
2590 dev_priv->renderctx = intel_alloc_context_page(dev);
2591 if (!dev_priv->renderctx)
2592 return -ENOMEM;
2593
2594 if (dev_priv->pwrctx == NULL)
2595 dev_priv->pwrctx = intel_alloc_context_page(dev);
2596 if (!dev_priv->pwrctx) {
2597 ironlake_teardown_rc6(dev);
2598 return -ENOMEM;
2599 }
2600
2601 return 0;
2602 }
2603
2604 static void ironlake_enable_rc6(struct drm_device *dev)
2605 {
2606 struct drm_i915_private *dev_priv = dev->dev_private;
2607 struct intel_ring_buffer *ring = &dev_priv->ring[RCS];
2608 int ret;
2609
2610 /* rc6 disabled by default due to repeated reports of hanging during
2611 * boot and resume.
2612 */
2613 if (!intel_enable_rc6(dev))
2614 return;
2615
2616 WARN_ON(!mutex_is_locked(&dev->struct_mutex));
2617
2618 ret = ironlake_setup_rc6(dev);
2619 if (ret)
2620 return;
2621
2622 /*
2623 * GPU can automatically power down the render unit if given a page
2624 * to save state.
2625 */
2626 ret = intel_ring_begin(ring, 6);
2627 if (ret) {
2628 ironlake_teardown_rc6(dev);
2629 return;
2630 }
2631
2632 intel_ring_emit(ring, MI_SUSPEND_FLUSH | MI_SUSPEND_FLUSH_EN);
2633 intel_ring_emit(ring, MI_SET_CONTEXT);
2634 intel_ring_emit(ring, dev_priv->renderctx->gtt_offset |
2635 MI_MM_SPACE_GTT |
2636 MI_SAVE_EXT_STATE_EN |
2637 MI_RESTORE_EXT_STATE_EN |
2638 MI_RESTORE_INHIBIT);
2639 intel_ring_emit(ring, MI_SUSPEND_FLUSH);
2640 intel_ring_emit(ring, MI_NOOP);
2641 intel_ring_emit(ring, MI_FLUSH);
2642 intel_ring_advance(ring);
2643
2644 /*
2645 * Wait for the command parser to advance past MI_SET_CONTEXT. The HW
2646 * does an implicit flush, combined with MI_FLUSH above, it should be
2647 * safe to assume that renderctx is valid
2648 */
2649 ret = intel_wait_ring_idle(ring);
2650 if (ret) {
2651 DRM_ERROR("failed to enable ironlake power power savings\n");
2652 ironlake_teardown_rc6(dev);
2653 return;
2654 }
2655
2656 I915_WRITE(PWRCTXA, dev_priv->pwrctx->gtt_offset | PWRCTX_EN);
2657 I915_WRITE(RSTDBYCTL, I915_READ(RSTDBYCTL) & ~RCX_SW_EXIT);
2658 }
2659
2660 static unsigned long intel_pxfreq(u32 vidfreq)
2661 {
2662 unsigned long freq;
2663 int div = (vidfreq & 0x3f0000) >> 16;
2664 int post = (vidfreq & 0x3000) >> 12;
2665 int pre = (vidfreq & 0x7);
2666
2667 if (!pre)
2668 return 0;
2669
2670 freq = ((div * 133333) / ((1<<post) * pre));
2671
2672 return freq;
2673 }
2674
2675 static const struct cparams {
2676 u16 i;
2677 u16 t;
2678 u16 m;
2679 u16 c;
2680 } cparams[] = {
2681 { 1, 1333, 301, 28664 },
2682 { 1, 1066, 294, 24460 },
2683 { 1, 800, 294, 25192 },
2684 { 0, 1333, 276, 27605 },
2685 { 0, 1066, 276, 27605 },
2686 { 0, 800, 231, 23784 },
2687 };
2688
2689 unsigned long i915_chipset_val(struct drm_i915_private *dev_priv)
2690 {
2691 u64 total_count, diff, ret;
2692 u32 count1, count2, count3, m = 0, c = 0;
2693 unsigned long now = jiffies_to_msecs(jiffies), diff1;
2694 int i;
2695
2696 diff1 = now - dev_priv->last_time1;
2697
2698 /* Prevent division-by-zero if we are asking too fast.
2699 * Also, we don't get interesting results if we are polling
2700 * faster than once in 10ms, so just return the saved value
2701 * in such cases.
2702 */
2703 if (diff1 <= 10)
2704 return dev_priv->chipset_power;
2705
2706 count1 = I915_READ(DMIEC);
2707 count2 = I915_READ(DDREC);
2708 count3 = I915_READ(CSIEC);
2709
2710 total_count = count1 + count2 + count3;
2711
2712 /* FIXME: handle per-counter overflow */
2713 if (total_count < dev_priv->last_count1) {
2714 diff = ~0UL - dev_priv->last_count1;
2715 diff += total_count;
2716 } else {
2717 diff = total_count - dev_priv->last_count1;
2718 }
2719
2720 for (i = 0; i < ARRAY_SIZE(cparams); i++) {
2721 if (cparams[i].i == dev_priv->c_m &&
2722 cparams[i].t == dev_priv->r_t) {
2723 m = cparams[i].m;
2724 c = cparams[i].c;
2725 break;
2726 }
2727 }
2728
2729 diff = div_u64(diff, diff1);
2730 ret = ((m * diff) + c);
2731 ret = div_u64(ret, 10);
2732
2733 dev_priv->last_count1 = total_count;
2734 dev_priv->last_time1 = now;
2735
2736 dev_priv->chipset_power = ret;
2737
2738 return ret;
2739 }
2740
2741 unsigned long i915_mch_val(struct drm_i915_private *dev_priv)
2742 {
2743 unsigned long m, x, b;
2744 u32 tsfs;
2745
2746 tsfs = I915_READ(TSFS);
2747
2748 m = ((tsfs & TSFS_SLOPE_MASK) >> TSFS_SLOPE_SHIFT);
2749 x = I915_READ8(TR1);
2750
2751 b = tsfs & TSFS_INTR_MASK;
2752
2753 return ((m * x) / 127) - b;
2754 }
2755
2756 static u16 pvid_to_extvid(struct drm_i915_private *dev_priv, u8 pxvid)
2757 {
2758 static const struct v_table {
2759 u16 vd; /* in .1 mil */
2760 u16 vm; /* in .1 mil */
2761 } v_table[] = {
2762 { 0, 0, },
2763 { 375, 0, },
2764 { 500, 0, },
2765 { 625, 0, },
2766 { 750, 0, },
2767 { 875, 0, },
2768 { 1000, 0, },
2769 { 1125, 0, },
2770 { 4125, 3000, },
2771 { 4125, 3000, },
2772 { 4125, 3000, },
2773 { 4125, 3000, },
2774 { 4125, 3000, },
2775 { 4125, 3000, },
2776 { 4125, 3000, },
2777 { 4125, 3000, },
2778 { 4125, 3000, },
2779 { 4125, 3000, },
2780 { 4125, 3000, },
2781 { 4125, 3000, },
2782 { 4125, 3000, },
2783 { 4125, 3000, },
2784 { 4125, 3000, },
2785 { 4125, 3000, },
2786 { 4125, 3000, },
2787 { 4125, 3000, },
2788 { 4125, 3000, },
2789 { 4125, 3000, },
2790 { 4125, 3000, },
2791 { 4125, 3000, },
2792 { 4125, 3000, },
2793 { 4125, 3000, },
2794 { 4250, 3125, },
2795 { 4375, 3250, },
2796 { 4500, 3375, },
2797 { 4625, 3500, },
2798 { 4750, 3625, },
2799 { 4875, 3750, },
2800 { 5000, 3875, },
2801 { 5125, 4000, },
2802 { 5250, 4125, },
2803 { 5375, 4250, },
2804 { 5500, 4375, },
2805 { 5625, 4500, },
2806 { 5750, 4625, },
2807 { 5875, 4750, },
2808 { 6000, 4875, },
2809 { 6125, 5000, },
2810 { 6250, 5125, },
2811 { 6375, 5250, },
2812 { 6500, 5375, },
2813 { 6625, 5500, },
2814 { 6750, 5625, },
2815 { 6875, 5750, },
2816 { 7000, 5875, },
2817 { 7125, 6000, },
2818 { 7250, 6125, },
2819 { 7375, 6250, },
2820 { 7500, 6375, },
2821 { 7625, 6500, },
2822 { 7750, 6625, },
2823 { 7875, 6750, },
2824 { 8000, 6875, },
2825 { 8125, 7000, },
2826 { 8250, 7125, },
2827 { 8375, 7250, },
2828 { 8500, 7375, },
2829 { 8625, 7500, },
2830 { 8750, 7625, },
2831 { 8875, 7750, },
2832 { 9000, 7875, },
2833 { 9125, 8000, },
2834 { 9250, 8125, },
2835 { 9375, 8250, },
2836 { 9500, 8375, },
2837 { 9625, 8500, },
2838 { 9750, 8625, },
2839 { 9875, 8750, },
2840 { 10000, 8875, },
2841 { 10125, 9000, },
2842 { 10250, 9125, },
2843 { 10375, 9250, },
2844 { 10500, 9375, },
2845 { 10625, 9500, },
2846 { 10750, 9625, },
2847 { 10875, 9750, },
2848 { 11000, 9875, },
2849 { 11125, 10000, },
2850 { 11250, 10125, },
2851 { 11375, 10250, },
2852 { 11500, 10375, },
2853 { 11625, 10500, },
2854 { 11750, 10625, },
2855 { 11875, 10750, },
2856 { 12000, 10875, },
2857 { 12125, 11000, },
2858 { 12250, 11125, },
2859 { 12375, 11250, },
2860 { 12500, 11375, },
2861 { 12625, 11500, },
2862 { 12750, 11625, },
2863 { 12875, 11750, },
2864 { 13000, 11875, },
2865 { 13125, 12000, },
2866 { 13250, 12125, },
2867 { 13375, 12250, },
2868 { 13500, 12375, },
2869 { 13625, 12500, },
2870 { 13750, 12625, },
2871 { 13875, 12750, },
2872 { 14000, 12875, },
2873 { 14125, 13000, },
2874 { 14250, 13125, },
2875 { 14375, 13250, },
2876 { 14500, 13375, },
2877 { 14625, 13500, },
2878 { 14750, 13625, },
2879 { 14875, 13750, },
2880 { 15000, 13875, },
2881 { 15125, 14000, },
2882 { 15250, 14125, },
2883 { 15375, 14250, },
2884 { 15500, 14375, },
2885 { 15625, 14500, },
2886 { 15750, 14625, },
2887 { 15875, 14750, },
2888 { 16000, 14875, },
2889 { 16125, 15000, },
2890 };
2891 if (dev_priv->info->is_mobile)
2892 return v_table[pxvid].vm;
2893 else
2894 return v_table[pxvid].vd;
2895 }
2896
2897 void i915_update_gfx_val(struct drm_i915_private *dev_priv)
2898 {
2899 struct timespec now, diff1;
2900 u64 diff;
2901 unsigned long diffms;
2902 u32 count;
2903
2904 if (dev_priv->info->gen != 5)
2905 return;
2906
2907 getrawmonotonic(&now);
2908 diff1 = timespec_sub(now, dev_priv->last_time2);
2909
2910 /* Don't divide by 0 */
2911 diffms = diff1.tv_sec * 1000 + diff1.tv_nsec / 1000000;
2912 if (!diffms)
2913 return;
2914
2915 count = I915_READ(GFXEC);
2916
2917 if (count < dev_priv->last_count2) {
2918 diff = ~0UL - dev_priv->last_count2;
2919 diff += count;
2920 } else {
2921 diff = count - dev_priv->last_count2;
2922 }
2923
2924 dev_priv->last_count2 = count;
2925 dev_priv->last_time2 = now;
2926
2927 /* More magic constants... */
2928 diff = diff * 1181;
2929 diff = div_u64(diff, diffms * 10);
2930 dev_priv->gfx_power = diff;
2931 }
2932
2933 unsigned long i915_gfx_val(struct drm_i915_private *dev_priv)
2934 {
2935 unsigned long t, corr, state1, corr2, state2;
2936 u32 pxvid, ext_v;
2937
2938 pxvid = I915_READ(PXVFREQ_BASE + (dev_priv->cur_delay * 4));
2939 pxvid = (pxvid >> 24) & 0x7f;
2940 ext_v = pvid_to_extvid(dev_priv, pxvid);
2941
2942 state1 = ext_v;
2943
2944 t = i915_mch_val(dev_priv);
2945
2946 /* Revel in the empirically derived constants */
2947
2948 /* Correction factor in 1/100000 units */
2949 if (t > 80)
2950 corr = ((t * 2349) + 135940);
2951 else if (t >= 50)
2952 corr = ((t * 964) + 29317);
2953 else /* < 50 */
2954 corr = ((t * 301) + 1004);
2955
2956 corr = corr * ((150142 * state1) / 10000 - 78642);
2957 corr /= 100000;
2958 corr2 = (corr * dev_priv->corr);
2959
2960 state2 = (corr2 * state1) / 10000;
2961 state2 /= 100; /* convert to mW */
2962
2963 i915_update_gfx_val(dev_priv);
2964
2965 return dev_priv->gfx_power + state2;
2966 }
2967
2968 /* Global for IPS driver to get at the current i915 device */
2969 static struct drm_i915_private *i915_mch_dev;
2970 /*
2971 * Lock protecting IPS related data structures
2972 * - i915_mch_dev
2973 * - dev_priv->max_delay
2974 * - dev_priv->min_delay
2975 * - dev_priv->fmax
2976 * - dev_priv->gpu_busy
2977 */
2978 static DEFINE_SPINLOCK(mchdev_lock);
2979
2980 /**
2981 * i915_read_mch_val - return value for IPS use
2982 *
2983 * Calculate and return a value for the IPS driver to use when deciding whether
2984 * we have thermal and power headroom to increase CPU or GPU power budget.
2985 */
2986 unsigned long i915_read_mch_val(void)
2987 {
2988 struct drm_i915_private *dev_priv;
2989 unsigned long chipset_val, graphics_val, ret = 0;
2990
2991 spin_lock(&mchdev_lock);
2992 if (!i915_mch_dev)
2993 goto out_unlock;
2994 dev_priv = i915_mch_dev;
2995
2996 chipset_val = i915_chipset_val(dev_priv);
2997 graphics_val = i915_gfx_val(dev_priv);
2998
2999 ret = chipset_val + graphics_val;
3000
3001 out_unlock:
3002 spin_unlock(&mchdev_lock);
3003
3004 return ret;
3005 }
3006 EXPORT_SYMBOL_GPL(i915_read_mch_val);
3007
3008 /**
3009 * i915_gpu_raise - raise GPU frequency limit
3010 *
3011 * Raise the limit; IPS indicates we have thermal headroom.
3012 */
3013 bool i915_gpu_raise(void)
3014 {
3015 struct drm_i915_private *dev_priv;
3016 bool ret = true;
3017
3018 spin_lock(&mchdev_lock);
3019 if (!i915_mch_dev) {
3020 ret = false;
3021 goto out_unlock;
3022 }
3023 dev_priv = i915_mch_dev;
3024
3025 if (dev_priv->max_delay > dev_priv->fmax)
3026 dev_priv->max_delay--;
3027
3028 out_unlock:
3029 spin_unlock(&mchdev_lock);
3030
3031 return ret;
3032 }
3033 EXPORT_SYMBOL_GPL(i915_gpu_raise);
3034
3035 /**
3036 * i915_gpu_lower - lower GPU frequency limit
3037 *
3038 * IPS indicates we're close to a thermal limit, so throttle back the GPU
3039 * frequency maximum.
3040 */
3041 bool i915_gpu_lower(void)
3042 {
3043 struct drm_i915_private *dev_priv;
3044 bool ret = true;
3045
3046 spin_lock(&mchdev_lock);
3047 if (!i915_mch_dev) {
3048 ret = false;
3049 goto out_unlock;
3050 }
3051 dev_priv = i915_mch_dev;
3052
3053 if (dev_priv->max_delay < dev_priv->min_delay)
3054 dev_priv->max_delay++;
3055
3056 out_unlock:
3057 spin_unlock(&mchdev_lock);
3058
3059 return ret;
3060 }
3061 EXPORT_SYMBOL_GPL(i915_gpu_lower);
3062
3063 /**
3064 * i915_gpu_busy - indicate GPU business to IPS
3065 *
3066 * Tell the IPS driver whether or not the GPU is busy.
3067 */
3068 bool i915_gpu_busy(void)
3069 {
3070 struct drm_i915_private *dev_priv;
3071 bool ret = false;
3072
3073 spin_lock(&mchdev_lock);
3074 if (!i915_mch_dev)
3075 goto out_unlock;
3076 dev_priv = i915_mch_dev;
3077
3078 ret = dev_priv->busy;
3079
3080 out_unlock:
3081 spin_unlock(&mchdev_lock);
3082
3083 return ret;
3084 }
3085 EXPORT_SYMBOL_GPL(i915_gpu_busy);
3086
3087 /**
3088 * i915_gpu_turbo_disable - disable graphics turbo
3089 *
3090 * Disable graphics turbo by resetting the max frequency and setting the
3091 * current frequency to the default.
3092 */
3093 bool i915_gpu_turbo_disable(void)
3094 {
3095 struct drm_i915_private *dev_priv;
3096 bool ret = true;
3097
3098 spin_lock(&mchdev_lock);
3099 if (!i915_mch_dev) {
3100 ret = false;
3101 goto out_unlock;
3102 }
3103 dev_priv = i915_mch_dev;
3104
3105 dev_priv->max_delay = dev_priv->fstart;
3106
3107 if (!ironlake_set_drps(dev_priv->dev, dev_priv->fstart))
3108 ret = false;
3109
3110 out_unlock:
3111 spin_unlock(&mchdev_lock);
3112
3113 return ret;
3114 }
3115 EXPORT_SYMBOL_GPL(i915_gpu_turbo_disable);
3116
3117 /**
3118 * Tells the intel_ips driver that the i915 driver is now loaded, if
3119 * IPS got loaded first.
3120 *
3121 * This awkward dance is so that neither module has to depend on the
3122 * other in order for IPS to do the appropriate communication of
3123 * GPU turbo limits to i915.
3124 */
3125 static void
3126 ips_ping_for_i915_load(void)
3127 {
3128 void (*link)(void);
3129
3130 link = symbol_get(ips_link_to_i915_driver);
3131 if (link) {
3132 link();
3133 symbol_put(ips_link_to_i915_driver);
3134 }
3135 }
3136
3137 void intel_gpu_ips_init(struct drm_i915_private *dev_priv)
3138 {
3139 spin_lock(&mchdev_lock);
3140 i915_mch_dev = dev_priv;
3141 dev_priv->mchdev_lock = &mchdev_lock;
3142 spin_unlock(&mchdev_lock);
3143
3144 ips_ping_for_i915_load();
3145 }
3146
3147 void intel_gpu_ips_teardown(void)
3148 {
3149 spin_lock(&mchdev_lock);
3150 i915_mch_dev = NULL;
3151 spin_unlock(&mchdev_lock);
3152 }
3153 static void intel_init_emon(struct drm_device *dev)
3154 {
3155 struct drm_i915_private *dev_priv = dev->dev_private;
3156 u32 lcfuse;
3157 u8 pxw[16];
3158 int i;
3159
3160 /* Disable to program */
3161 I915_WRITE(ECR, 0);
3162 POSTING_READ(ECR);
3163
3164 /* Program energy weights for various events */
3165 I915_WRITE(SDEW, 0x15040d00);
3166 I915_WRITE(CSIEW0, 0x007f0000);
3167 I915_WRITE(CSIEW1, 0x1e220004);
3168 I915_WRITE(CSIEW2, 0x04000004);
3169
3170 for (i = 0; i < 5; i++)
3171 I915_WRITE(PEW + (i * 4), 0);
3172 for (i = 0; i < 3; i++)
3173 I915_WRITE(DEW + (i * 4), 0);
3174
3175 /* Program P-state weights to account for frequency power adjustment */
3176 for (i = 0; i < 16; i++) {
3177 u32 pxvidfreq = I915_READ(PXVFREQ_BASE + (i * 4));
3178 unsigned long freq = intel_pxfreq(pxvidfreq);
3179 unsigned long vid = (pxvidfreq & PXVFREQ_PX_MASK) >>
3180 PXVFREQ_PX_SHIFT;
3181 unsigned long val;
3182
3183 val = vid * vid;
3184 val *= (freq / 1000);
3185 val *= 255;
3186 val /= (127*127*900);
3187 if (val > 0xff)
3188 DRM_ERROR("bad pxval: %ld\n", val);
3189 pxw[i] = val;
3190 }
3191 /* Render standby states get 0 weight */
3192 pxw[14] = 0;
3193 pxw[15] = 0;
3194
3195 for (i = 0; i < 4; i++) {
3196 u32 val = (pxw[i*4] << 24) | (pxw[(i*4)+1] << 16) |
3197 (pxw[(i*4)+2] << 8) | (pxw[(i*4)+3]);
3198 I915_WRITE(PXW + (i * 4), val);
3199 }
3200
3201 /* Adjust magic regs to magic values (more experimental results) */
3202 I915_WRITE(OGW0, 0);
3203 I915_WRITE(OGW1, 0);
3204 I915_WRITE(EG0, 0x00007f00);
3205 I915_WRITE(EG1, 0x0000000e);
3206 I915_WRITE(EG2, 0x000e0000);
3207 I915_WRITE(EG3, 0x68000300);
3208 I915_WRITE(EG4, 0x42000000);
3209 I915_WRITE(EG5, 0x00140031);
3210 I915_WRITE(EG6, 0);
3211 I915_WRITE(EG7, 0);
3212
3213 for (i = 0; i < 8; i++)
3214 I915_WRITE(PXWL + (i * 4), 0);
3215
3216 /* Enable PMON + select events */
3217 I915_WRITE(ECR, 0x80000019);
3218
3219 lcfuse = I915_READ(LCFUSE02);
3220
3221 dev_priv->corr = (lcfuse & LCFUSE_HIV_MASK);
3222 }
3223
3224 void intel_disable_gt_powersave(struct drm_device *dev)
3225 {
3226 if (IS_IRONLAKE_M(dev)) {
3227 ironlake_disable_drps(dev);
3228 ironlake_disable_rc6(dev);
3229 } else if (INTEL_INFO(dev)->gen >= 6 && !IS_VALLEYVIEW(dev)) {
3230 gen6_disable_rps(dev);
3231 }
3232 }
3233
3234 void intel_enable_gt_powersave(struct drm_device *dev)
3235 {
3236 if (IS_IRONLAKE_M(dev)) {
3237 ironlake_enable_drps(dev);
3238 ironlake_enable_rc6(dev);
3239 intel_init_emon(dev);
3240 } else if ((IS_GEN6(dev) || IS_GEN7(dev)) && !IS_VALLEYVIEW(dev)) {
3241 gen6_enable_rps(dev);
3242 gen6_update_ring_freq(dev);
3243 }
3244 }
3245
3246 static void ironlake_init_clock_gating(struct drm_device *dev)
3247 {
3248 struct drm_i915_private *dev_priv = dev->dev_private;
3249 uint32_t dspclk_gate = VRHUNIT_CLOCK_GATE_DISABLE;
3250
3251 /* Required for FBC */
3252 dspclk_gate |= DPFCUNIT_CLOCK_GATE_DISABLE |
3253 DPFCRUNIT_CLOCK_GATE_DISABLE |
3254 DPFDUNIT_CLOCK_GATE_DISABLE;
3255 /* Required for CxSR */
3256 dspclk_gate |= DPARBUNIT_CLOCK_GATE_DISABLE;
3257
3258 I915_WRITE(PCH_3DCGDIS0,
3259 MARIUNIT_CLOCK_GATE_DISABLE |
3260 SVSMUNIT_CLOCK_GATE_DISABLE);
3261 I915_WRITE(PCH_3DCGDIS1,
3262 VFMUNIT_CLOCK_GATE_DISABLE);
3263
3264 I915_WRITE(PCH_DSPCLK_GATE_D, dspclk_gate);
3265
3266 /*
3267 * According to the spec the following bits should be set in
3268 * order to enable memory self-refresh
3269 * The bit 22/21 of 0x42004
3270 * The bit 5 of 0x42020
3271 * The bit 15 of 0x45000
3272 */
3273 I915_WRITE(ILK_DISPLAY_CHICKEN2,
3274 (I915_READ(ILK_DISPLAY_CHICKEN2) |
3275 ILK_DPARB_GATE | ILK_VSDPFD_FULL));
3276 I915_WRITE(ILK_DSPCLK_GATE,
3277 (I915_READ(ILK_DSPCLK_GATE) |
3278 ILK_DPARB_CLK_GATE));
3279 I915_WRITE(DISP_ARB_CTL,
3280 (I915_READ(DISP_ARB_CTL) |
3281 DISP_FBC_WM_DIS));
3282 I915_WRITE(WM3_LP_ILK, 0);
3283 I915_WRITE(WM2_LP_ILK, 0);
3284 I915_WRITE(WM1_LP_ILK, 0);
3285
3286 /*
3287 * Based on the document from hardware guys the following bits
3288 * should be set unconditionally in order to enable FBC.
3289 * The bit 22 of 0x42000
3290 * The bit 22 of 0x42004
3291 * The bit 7,8,9 of 0x42020.
3292 */
3293 if (IS_IRONLAKE_M(dev)) {
3294 I915_WRITE(ILK_DISPLAY_CHICKEN1,
3295 I915_READ(ILK_DISPLAY_CHICKEN1) |
3296 ILK_FBCQ_DIS);
3297 I915_WRITE(ILK_DISPLAY_CHICKEN2,
3298 I915_READ(ILK_DISPLAY_CHICKEN2) |
3299 ILK_DPARB_GATE);
3300 I915_WRITE(ILK_DSPCLK_GATE,
3301 I915_READ(ILK_DSPCLK_GATE) |
3302 ILK_DPFC_DIS1 |
3303 ILK_DPFC_DIS2 |
3304 ILK_CLK_FBC);
3305 }
3306
3307 I915_WRITE(ILK_DISPLAY_CHICKEN2,
3308 I915_READ(ILK_DISPLAY_CHICKEN2) |
3309 ILK_ELPIN_409_SELECT);
3310 I915_WRITE(_3D_CHICKEN2,
3311 _3D_CHICKEN2_WM_READ_PIPELINED << 16 |
3312 _3D_CHICKEN2_WM_READ_PIPELINED);
3313 }
3314
3315 static void gen6_init_clock_gating(struct drm_device *dev)
3316 {
3317 struct drm_i915_private *dev_priv = dev->dev_private;
3318 int pipe;
3319 uint32_t dspclk_gate = VRHUNIT_CLOCK_GATE_DISABLE;
3320
3321 I915_WRITE(PCH_DSPCLK_GATE_D, dspclk_gate);
3322
3323 I915_WRITE(ILK_DISPLAY_CHICKEN2,
3324 I915_READ(ILK_DISPLAY_CHICKEN2) |
3325 ILK_ELPIN_409_SELECT);
3326
3327 I915_WRITE(WM3_LP_ILK, 0);
3328 I915_WRITE(WM2_LP_ILK, 0);
3329 I915_WRITE(WM1_LP_ILK, 0);
3330
3331 I915_WRITE(CACHE_MODE_0,
3332 _MASKED_BIT_DISABLE(CM0_STC_EVICT_DISABLE_LRA_SNB));
3333
3334 I915_WRITE(GEN6_UCGCTL1,
3335 I915_READ(GEN6_UCGCTL1) |
3336 GEN6_BLBUNIT_CLOCK_GATE_DISABLE |
3337 GEN6_CSUNIT_CLOCK_GATE_DISABLE);
3338
3339 /* According to the BSpec vol1g, bit 12 (RCPBUNIT) clock
3340 * gating disable must be set. Failure to set it results in
3341 * flickering pixels due to Z write ordering failures after
3342 * some amount of runtime in the Mesa "fire" demo, and Unigine
3343 * Sanctuary and Tropics, and apparently anything else with
3344 * alpha test or pixel discard.
3345 *
3346 * According to the spec, bit 11 (RCCUNIT) must also be set,
3347 * but we didn't debug actual testcases to find it out.
3348 *
3349 * Also apply WaDisableVDSUnitClockGating and
3350 * WaDisableRCPBUnitClockGating.
3351 */
3352 I915_WRITE(GEN6_UCGCTL2,
3353 GEN7_VDSUNIT_CLOCK_GATE_DISABLE |
3354 GEN6_RCPBUNIT_CLOCK_GATE_DISABLE |
3355 GEN6_RCCUNIT_CLOCK_GATE_DISABLE);
3356
3357 /* Bspec says we need to always set all mask bits. */
3358 I915_WRITE(_3D_CHICKEN, (0xFFFF << 16) |
3359 _3D_CHICKEN_SF_DISABLE_FASTCLIP_CULL);
3360
3361 /*
3362 * According to the spec the following bits should be
3363 * set in order to enable memory self-refresh and fbc:
3364 * The bit21 and bit22 of 0x42000
3365 * The bit21 and bit22 of 0x42004
3366 * The bit5 and bit7 of 0x42020
3367 * The bit14 of 0x70180
3368 * The bit14 of 0x71180
3369 */
3370 I915_WRITE(ILK_DISPLAY_CHICKEN1,
3371 I915_READ(ILK_DISPLAY_CHICKEN1) |
3372 ILK_FBCQ_DIS | ILK_PABSTRETCH_DIS);
3373 I915_WRITE(ILK_DISPLAY_CHICKEN2,
3374 I915_READ(ILK_DISPLAY_CHICKEN2) |
3375 ILK_DPARB_GATE | ILK_VSDPFD_FULL);
3376 I915_WRITE(ILK_DSPCLK_GATE,
3377 I915_READ(ILK_DSPCLK_GATE) |
3378 ILK_DPARB_CLK_GATE |
3379 ILK_DPFD_CLK_GATE);
3380
3381 I915_WRITE(GEN6_MBCTL, I915_READ(GEN6_MBCTL) |
3382 GEN6_MBCTL_ENABLE_BOOT_FETCH);
3383
3384 for_each_pipe(pipe) {
3385 I915_WRITE(DSPCNTR(pipe),
3386 I915_READ(DSPCNTR(pipe)) |
3387 DISPPLANE_TRICKLE_FEED_DISABLE);
3388 intel_flush_display_plane(dev_priv, pipe);
3389 }
3390 }
3391
3392 static void gen7_setup_fixed_func_scheduler(struct drm_i915_private *dev_priv)
3393 {
3394 uint32_t reg = I915_READ(GEN7_FF_THREAD_MODE);
3395
3396 reg &= ~GEN7_FF_SCHED_MASK;
3397 reg |= GEN7_FF_TS_SCHED_HW;
3398 reg |= GEN7_FF_VS_SCHED_HW;
3399 reg |= GEN7_FF_DS_SCHED_HW;
3400
3401 I915_WRITE(GEN7_FF_THREAD_MODE, reg);
3402 }
3403
3404 static void haswell_init_clock_gating(struct drm_device *dev)
3405 {
3406 struct drm_i915_private *dev_priv = dev->dev_private;
3407 int pipe;
3408 uint32_t dspclk_gate = VRHUNIT_CLOCK_GATE_DISABLE;
3409
3410 I915_WRITE(PCH_DSPCLK_GATE_D, dspclk_gate);
3411
3412 I915_WRITE(WM3_LP_ILK, 0);
3413 I915_WRITE(WM2_LP_ILK, 0);
3414 I915_WRITE(WM1_LP_ILK, 0);
3415
3416 /* According to the spec, bit 13 (RCZUNIT) must be set on IVB.
3417 * This implements the WaDisableRCZUnitClockGating workaround.
3418 */
3419 I915_WRITE(GEN6_UCGCTL2, GEN6_RCZUNIT_CLOCK_GATE_DISABLE);
3420
3421 I915_WRITE(ILK_DSPCLK_GATE, IVB_VRHUNIT_CLK_GATE);
3422
3423 I915_WRITE(IVB_CHICKEN3,
3424 CHICKEN3_DGMG_REQ_OUT_FIX_DISABLE |
3425 CHICKEN3_DGMG_DONE_FIX_DISABLE);
3426
3427 /* Apply the WaDisableRHWOOptimizationForRenderHang workaround. */
3428 I915_WRITE(GEN7_COMMON_SLICE_CHICKEN1,
3429 GEN7_CSC1_RHWO_OPT_DISABLE_IN_RCC);
3430
3431 /* WaApplyL3ControlAndL3ChickenMode requires those two on Ivy Bridge */
3432 I915_WRITE(GEN7_L3CNTLREG1,
3433 GEN7_WA_FOR_GEN7_L3_CONTROL);
3434 I915_WRITE(GEN7_L3_CHICKEN_MODE_REGISTER,
3435 GEN7_WA_L3_CHICKEN_MODE);
3436
3437 /* This is required by WaCatErrorRejectionIssue */
3438 I915_WRITE(GEN7_SQ_CHICKEN_MBCUNIT_CONFIG,
3439 I915_READ(GEN7_SQ_CHICKEN_MBCUNIT_CONFIG) |
3440 GEN7_SQ_CHICKEN_MBCUNIT_SQINTMOB);
3441
3442 for_each_pipe(pipe) {
3443 I915_WRITE(DSPCNTR(pipe),
3444 I915_READ(DSPCNTR(pipe)) |
3445 DISPPLANE_TRICKLE_FEED_DISABLE);
3446 intel_flush_display_plane(dev_priv, pipe);
3447 }
3448
3449 gen7_setup_fixed_func_scheduler(dev_priv);
3450
3451 /* WaDisable4x2SubspanOptimization */
3452 I915_WRITE(CACHE_MODE_1,
3453 _MASKED_BIT_ENABLE(PIXEL_SUBSPAN_COLLECT_OPT_DISABLE));
3454
3455 /* XXX: This is a workaround for early silicon revisions and should be
3456 * removed later.
3457 */
3458 I915_WRITE(WM_DBG,
3459 I915_READ(WM_DBG) |
3460 WM_DBG_DISALLOW_MULTIPLE_LP |
3461 WM_DBG_DISALLOW_SPRITE |
3462 WM_DBG_DISALLOW_MAXFIFO);
3463
3464 }
3465
3466 static void ivybridge_init_clock_gating(struct drm_device *dev)
3467 {
3468 struct drm_i915_private *dev_priv = dev->dev_private;
3469 int pipe;
3470 uint32_t dspclk_gate = VRHUNIT_CLOCK_GATE_DISABLE;
3471 uint32_t snpcr;
3472
3473 I915_WRITE(PCH_DSPCLK_GATE_D, dspclk_gate);
3474
3475 I915_WRITE(WM3_LP_ILK, 0);
3476 I915_WRITE(WM2_LP_ILK, 0);
3477 I915_WRITE(WM1_LP_ILK, 0);
3478
3479 I915_WRITE(ILK_DSPCLK_GATE, IVB_VRHUNIT_CLK_GATE);
3480
3481 I915_WRITE(IVB_CHICKEN3,
3482 CHICKEN3_DGMG_REQ_OUT_FIX_DISABLE |
3483 CHICKEN3_DGMG_DONE_FIX_DISABLE);
3484
3485 /* Apply the WaDisableRHWOOptimizationForRenderHang workaround. */
3486 I915_WRITE(GEN7_COMMON_SLICE_CHICKEN1,
3487 GEN7_CSC1_RHWO_OPT_DISABLE_IN_RCC);
3488
3489 /* WaApplyL3ControlAndL3ChickenMode requires those two on Ivy Bridge */
3490 I915_WRITE(GEN7_L3CNTLREG1,
3491 GEN7_WA_FOR_GEN7_L3_CONTROL);
3492 I915_WRITE(GEN7_L3_CHICKEN_MODE_REGISTER,
3493 GEN7_WA_L3_CHICKEN_MODE);
3494
3495 /* According to the BSpec vol1g, bit 12 (RCPBUNIT) clock
3496 * gating disable must be set. Failure to set it results in
3497 * flickering pixels due to Z write ordering failures after
3498 * some amount of runtime in the Mesa "fire" demo, and Unigine
3499 * Sanctuary and Tropics, and apparently anything else with
3500 * alpha test or pixel discard.
3501 *
3502 * According to the spec, bit 11 (RCCUNIT) must also be set,
3503 * but we didn't debug actual testcases to find it out.
3504 *
3505 * According to the spec, bit 13 (RCZUNIT) must be set on IVB.
3506 * This implements the WaDisableRCZUnitClockGating workaround.
3507 */
3508 I915_WRITE(GEN6_UCGCTL2,
3509 GEN6_RCZUNIT_CLOCK_GATE_DISABLE |
3510 GEN6_RCCUNIT_CLOCK_GATE_DISABLE);
3511
3512 /* This is required by WaCatErrorRejectionIssue */
3513 I915_WRITE(GEN7_SQ_CHICKEN_MBCUNIT_CONFIG,
3514 I915_READ(GEN7_SQ_CHICKEN_MBCUNIT_CONFIG) |
3515 GEN7_SQ_CHICKEN_MBCUNIT_SQINTMOB);
3516
3517 for_each_pipe(pipe) {
3518 I915_WRITE(DSPCNTR(pipe),
3519 I915_READ(DSPCNTR(pipe)) |
3520 DISPPLANE_TRICKLE_FEED_DISABLE);
3521 intel_flush_display_plane(dev_priv, pipe);
3522 }
3523
3524 I915_WRITE(GEN6_MBCTL, I915_READ(GEN6_MBCTL) |
3525 GEN6_MBCTL_ENABLE_BOOT_FETCH);
3526
3527 gen7_setup_fixed_func_scheduler(dev_priv);
3528
3529 /* WaDisable4x2SubspanOptimization */
3530 I915_WRITE(CACHE_MODE_1,
3531 _MASKED_BIT_ENABLE(PIXEL_SUBSPAN_COLLECT_OPT_DISABLE));
3532
3533 snpcr = I915_READ(GEN6_MBCUNIT_SNPCR);
3534 snpcr &= ~GEN6_MBC_SNPCR_MASK;
3535 snpcr |= GEN6_MBC_SNPCR_MED;
3536 I915_WRITE(GEN6_MBCUNIT_SNPCR, snpcr);
3537 }
3538
3539 static void valleyview_init_clock_gating(struct drm_device *dev)
3540 {
3541 struct drm_i915_private *dev_priv = dev->dev_private;
3542 int pipe;
3543 uint32_t dspclk_gate = VRHUNIT_CLOCK_GATE_DISABLE;
3544
3545 I915_WRITE(PCH_DSPCLK_GATE_D, dspclk_gate);
3546
3547 I915_WRITE(WM3_LP_ILK, 0);
3548 I915_WRITE(WM2_LP_ILK, 0);
3549 I915_WRITE(WM1_LP_ILK, 0);
3550
3551 I915_WRITE(ILK_DSPCLK_GATE, IVB_VRHUNIT_CLK_GATE);
3552
3553 I915_WRITE(IVB_CHICKEN3,
3554 CHICKEN3_DGMG_REQ_OUT_FIX_DISABLE |
3555 CHICKEN3_DGMG_DONE_FIX_DISABLE);
3556
3557 /* Apply the WaDisableRHWOOptimizationForRenderHang workaround. */
3558 I915_WRITE(GEN7_COMMON_SLICE_CHICKEN1,
3559 GEN7_CSC1_RHWO_OPT_DISABLE_IN_RCC);
3560
3561 /* WaApplyL3ControlAndL3ChickenMode requires those two on Ivy Bridge */
3562 I915_WRITE(GEN7_L3CNTLREG1, GEN7_WA_FOR_GEN7_L3_CONTROL);
3563 I915_WRITE(GEN7_L3_CHICKEN_MODE_REGISTER, GEN7_WA_L3_CHICKEN_MODE);
3564
3565 /* This is required by WaCatErrorRejectionIssue */
3566 I915_WRITE(GEN7_SQ_CHICKEN_MBCUNIT_CONFIG,
3567 I915_READ(GEN7_SQ_CHICKEN_MBCUNIT_CONFIG) |
3568 GEN7_SQ_CHICKEN_MBCUNIT_SQINTMOB);
3569
3570 I915_WRITE(GEN6_MBCTL, I915_READ(GEN6_MBCTL) |
3571 GEN6_MBCTL_ENABLE_BOOT_FETCH);
3572
3573
3574 /* According to the BSpec vol1g, bit 12 (RCPBUNIT) clock
3575 * gating disable must be set. Failure to set it results in
3576 * flickering pixels due to Z write ordering failures after
3577 * some amount of runtime in the Mesa "fire" demo, and Unigine
3578 * Sanctuary and Tropics, and apparently anything else with
3579 * alpha test or pixel discard.
3580 *
3581 * According to the spec, bit 11 (RCCUNIT) must also be set,
3582 * but we didn't debug actual testcases to find it out.
3583 *
3584 * According to the spec, bit 13 (RCZUNIT) must be set on IVB.
3585 * This implements the WaDisableRCZUnitClockGating workaround.
3586 *
3587 * Also apply WaDisableVDSUnitClockGating and
3588 * WaDisableRCPBUnitClockGating.
3589 */
3590 I915_WRITE(GEN6_UCGCTL2,
3591 GEN7_VDSUNIT_CLOCK_GATE_DISABLE |
3592 GEN7_TDLUNIT_CLOCK_GATE_DISABLE |
3593 GEN6_RCZUNIT_CLOCK_GATE_DISABLE |
3594 GEN6_RCPBUNIT_CLOCK_GATE_DISABLE |
3595 GEN6_RCCUNIT_CLOCK_GATE_DISABLE);
3596
3597 I915_WRITE(GEN7_UCGCTL4, GEN7_L3BANK2X_CLOCK_GATE_DISABLE);
3598
3599 for_each_pipe(pipe) {
3600 I915_WRITE(DSPCNTR(pipe),
3601 I915_READ(DSPCNTR(pipe)) |
3602 DISPPLANE_TRICKLE_FEED_DISABLE);
3603 intel_flush_display_plane(dev_priv, pipe);
3604 }
3605
3606 I915_WRITE(CACHE_MODE_1,
3607 _MASKED_BIT_ENABLE(PIXEL_SUBSPAN_COLLECT_OPT_DISABLE));
3608
3609 /*
3610 * On ValleyView, the GUnit needs to signal the GT
3611 * when flip and other events complete. So enable
3612 * all the GUnit->GT interrupts here
3613 */
3614 I915_WRITE(VLV_DPFLIPSTAT, PIPEB_LINE_COMPARE_INT_EN |
3615 PIPEB_HLINE_INT_EN | PIPEB_VBLANK_INT_EN |
3616 SPRITED_FLIPDONE_INT_EN | SPRITEC_FLIPDONE_INT_EN |
3617 PLANEB_FLIPDONE_INT_EN | PIPEA_LINE_COMPARE_INT_EN |
3618 PIPEA_HLINE_INT_EN | PIPEA_VBLANK_INT_EN |
3619 SPRITEB_FLIPDONE_INT_EN | SPRITEA_FLIPDONE_INT_EN |
3620 PLANEA_FLIPDONE_INT_EN);
3621 }
3622
3623 static void g4x_init_clock_gating(struct drm_device *dev)
3624 {
3625 struct drm_i915_private *dev_priv = dev->dev_private;
3626 uint32_t dspclk_gate;
3627
3628 I915_WRITE(RENCLK_GATE_D1, 0);
3629 I915_WRITE(RENCLK_GATE_D2, VF_UNIT_CLOCK_GATE_DISABLE |
3630 GS_UNIT_CLOCK_GATE_DISABLE |
3631 CL_UNIT_CLOCK_GATE_DISABLE);
3632 I915_WRITE(RAMCLK_GATE_D, 0);
3633 dspclk_gate = VRHUNIT_CLOCK_GATE_DISABLE |
3634 OVRUNIT_CLOCK_GATE_DISABLE |
3635 OVCUNIT_CLOCK_GATE_DISABLE;
3636 if (IS_GM45(dev))
3637 dspclk_gate |= DSSUNIT_CLOCK_GATE_DISABLE;
3638 I915_WRITE(DSPCLK_GATE_D, dspclk_gate);
3639 }
3640
3641 static void crestline_init_clock_gating(struct drm_device *dev)
3642 {
3643 struct drm_i915_private *dev_priv = dev->dev_private;
3644
3645 I915_WRITE(RENCLK_GATE_D1, I965_RCC_CLOCK_GATE_DISABLE);
3646 I915_WRITE(RENCLK_GATE_D2, 0);
3647 I915_WRITE(DSPCLK_GATE_D, 0);
3648 I915_WRITE(RAMCLK_GATE_D, 0);
3649 I915_WRITE16(DEUC, 0);
3650 }
3651
3652 static void broadwater_init_clock_gating(struct drm_device *dev)
3653 {
3654 struct drm_i915_private *dev_priv = dev->dev_private;
3655
3656 I915_WRITE(RENCLK_GATE_D1, I965_RCZ_CLOCK_GATE_DISABLE |
3657 I965_RCC_CLOCK_GATE_DISABLE |
3658 I965_RCPB_CLOCK_GATE_DISABLE |
3659 I965_ISC_CLOCK_GATE_DISABLE |
3660 I965_FBC_CLOCK_GATE_DISABLE);
3661 I915_WRITE(RENCLK_GATE_D2, 0);
3662 }
3663
3664 static void gen3_init_clock_gating(struct drm_device *dev)
3665 {
3666 struct drm_i915_private *dev_priv = dev->dev_private;
3667 u32 dstate = I915_READ(D_STATE);
3668
3669 dstate |= DSTATE_PLL_D3_OFF | DSTATE_GFX_CLOCK_GATING |
3670 DSTATE_DOT_CLOCK_GATING;
3671 I915_WRITE(D_STATE, dstate);
3672
3673 if (IS_PINEVIEW(dev))
3674 I915_WRITE(ECOSKPD, _MASKED_BIT_ENABLE(ECO_GATING_CX_ONLY));
3675 }
3676
3677 static void i85x_init_clock_gating(struct drm_device *dev)
3678 {
3679 struct drm_i915_private *dev_priv = dev->dev_private;
3680
3681 I915_WRITE(RENCLK_GATE_D1, SV_CLOCK_GATE_DISABLE);
3682 }
3683
3684 static void i830_init_clock_gating(struct drm_device *dev)
3685 {
3686 struct drm_i915_private *dev_priv = dev->dev_private;
3687
3688 I915_WRITE(DSPCLK_GATE_D, OVRUNIT_CLOCK_GATE_DISABLE);
3689 }
3690
3691 static void ibx_init_clock_gating(struct drm_device *dev)
3692 {
3693 struct drm_i915_private *dev_priv = dev->dev_private;
3694
3695 /*
3696 * On Ibex Peak and Cougar Point, we need to disable clock
3697 * gating for the panel power sequencer or it will fail to
3698 * start up when no ports are active.
3699 */
3700 I915_WRITE(SOUTH_DSPCLK_GATE_D, PCH_DPLSUNIT_CLOCK_GATE_DISABLE);
3701 }
3702
3703 static void cpt_init_clock_gating(struct drm_device *dev)
3704 {
3705 struct drm_i915_private *dev_priv = dev->dev_private;
3706 int pipe;
3707
3708 /*
3709 * On Ibex Peak and Cougar Point, we need to disable clock
3710 * gating for the panel power sequencer or it will fail to
3711 * start up when no ports are active.
3712 */
3713 I915_WRITE(SOUTH_DSPCLK_GATE_D, PCH_DPLSUNIT_CLOCK_GATE_DISABLE);
3714 I915_WRITE(SOUTH_CHICKEN2, I915_READ(SOUTH_CHICKEN2) |
3715 DPLS_EDP_PPS_FIX_DIS);
3716 /* Without this, mode sets may fail silently on FDI */
3717 for_each_pipe(pipe)
3718 I915_WRITE(TRANS_CHICKEN2(pipe), TRANS_AUTOTRAIN_GEN_STALL_DIS);
3719 }
3720
3721 void intel_init_clock_gating(struct drm_device *dev)
3722 {
3723 struct drm_i915_private *dev_priv = dev->dev_private;
3724
3725 dev_priv->display.init_clock_gating(dev);
3726
3727 if (dev_priv->display.init_pch_clock_gating)
3728 dev_priv->display.init_pch_clock_gating(dev);
3729 }
3730
3731 static void gen6_sanitize_pm(struct drm_device *dev)
3732 {
3733 struct drm_i915_private *dev_priv = dev->dev_private;
3734 u32 limits, delay, old;
3735
3736 gen6_gt_force_wake_get(dev_priv);
3737
3738 old = limits = I915_READ(GEN6_RP_INTERRUPT_LIMITS);
3739 /* Make sure we continue to get interrupts
3740 * until we hit the minimum or maximum frequencies.
3741 */
3742 limits &= ~(0x3f << 16 | 0x3f << 24);
3743 delay = dev_priv->cur_delay;
3744 if (delay < dev_priv->max_delay)
3745 limits |= (dev_priv->max_delay & 0x3f) << 24;
3746 if (delay > dev_priv->min_delay)
3747 limits |= (dev_priv->min_delay & 0x3f) << 16;
3748
3749 if (old != limits) {
3750 /* Note that the known failure case is to read back 0. */
3751 DRM_DEBUG_DRIVER("Power management discrepancy: GEN6_RP_INTERRUPT_LIMITS "
3752 "expected %08x, was %08x\n", limits, old);
3753 I915_WRITE(GEN6_RP_INTERRUPT_LIMITS, limits);
3754 }
3755
3756 gen6_gt_force_wake_put(dev_priv);
3757 }
3758
3759 void intel_sanitize_pm(struct drm_device *dev)
3760 {
3761 struct drm_i915_private *dev_priv = dev->dev_private;
3762
3763 if (dev_priv->display.sanitize_pm)
3764 dev_priv->display.sanitize_pm(dev);
3765 }
3766
3767 /* Starting with Haswell, we have different power wells for
3768 * different parts of the GPU. This attempts to enable them all.
3769 */
3770 void intel_init_power_wells(struct drm_device *dev)
3771 {
3772 struct drm_i915_private *dev_priv = dev->dev_private;
3773 unsigned long power_wells[] = {
3774 HSW_PWR_WELL_CTL1,
3775 HSW_PWR_WELL_CTL2,
3776 HSW_PWR_WELL_CTL4
3777 };
3778 int i;
3779
3780 if (!IS_HASWELL(dev))
3781 return;
3782
3783 mutex_lock(&dev->struct_mutex);
3784
3785 for (i = 0; i < ARRAY_SIZE(power_wells); i++) {
3786 int well = I915_READ(power_wells[i]);
3787
3788 if ((well & HSW_PWR_WELL_STATE) == 0) {
3789 I915_WRITE(power_wells[i], well & HSW_PWR_WELL_ENABLE);
3790 if (wait_for(I915_READ(power_wells[i] & HSW_PWR_WELL_STATE), 20))
3791 DRM_ERROR("Error enabling power well %lx\n", power_wells[i]);
3792 }
3793 }
3794
3795 mutex_unlock(&dev->struct_mutex);
3796 }
3797
3798 /* Set up chip specific power management-related functions */
3799 void intel_init_pm(struct drm_device *dev)
3800 {
3801 struct drm_i915_private *dev_priv = dev->dev_private;
3802
3803 if (I915_HAS_FBC(dev)) {
3804 if (HAS_PCH_SPLIT(dev)) {
3805 dev_priv->display.fbc_enabled = ironlake_fbc_enabled;
3806 dev_priv->display.enable_fbc = ironlake_enable_fbc;
3807 dev_priv->display.disable_fbc = ironlake_disable_fbc;
3808 } else if (IS_GM45(dev)) {
3809 dev_priv->display.fbc_enabled = g4x_fbc_enabled;
3810 dev_priv->display.enable_fbc = g4x_enable_fbc;
3811 dev_priv->display.disable_fbc = g4x_disable_fbc;
3812 } else if (IS_CRESTLINE(dev)) {
3813 dev_priv->display.fbc_enabled = i8xx_fbc_enabled;
3814 dev_priv->display.enable_fbc = i8xx_enable_fbc;
3815 dev_priv->display.disable_fbc = i8xx_disable_fbc;
3816 }
3817 /* 855GM needs testing */
3818 }
3819
3820 /* For cxsr */
3821 if (IS_PINEVIEW(dev))
3822 i915_pineview_get_mem_freq(dev);
3823 else if (IS_GEN5(dev))
3824 i915_ironlake_get_mem_freq(dev);
3825
3826 /* For FIFO watermark updates */
3827 if (HAS_PCH_SPLIT(dev)) {
3828 if (HAS_PCH_IBX(dev))
3829 dev_priv->display.init_pch_clock_gating = ibx_init_clock_gating;
3830 else if (HAS_PCH_CPT(dev))
3831 dev_priv->display.init_pch_clock_gating = cpt_init_clock_gating;
3832
3833 if (IS_GEN5(dev)) {
3834 if (I915_READ(MLTR_ILK) & ILK_SRLT_MASK)
3835 dev_priv->display.update_wm = ironlake_update_wm;
3836 else {
3837 DRM_DEBUG_KMS("Failed to get proper latency. "
3838 "Disable CxSR\n");
3839 dev_priv->display.update_wm = NULL;
3840 }
3841 dev_priv->display.init_clock_gating = ironlake_init_clock_gating;
3842 } else if (IS_GEN6(dev)) {
3843 if (SNB_READ_WM0_LATENCY()) {
3844 dev_priv->display.update_wm = sandybridge_update_wm;
3845 dev_priv->display.update_sprite_wm = sandybridge_update_sprite_wm;
3846 } else {
3847 DRM_DEBUG_KMS("Failed to read display plane latency. "
3848 "Disable CxSR\n");
3849 dev_priv->display.update_wm = NULL;
3850 }
3851 dev_priv->display.init_clock_gating = gen6_init_clock_gating;
3852 dev_priv->display.sanitize_pm = gen6_sanitize_pm;
3853 } else if (IS_IVYBRIDGE(dev)) {
3854 /* FIXME: detect B0+ stepping and use auto training */
3855 if (SNB_READ_WM0_LATENCY()) {
3856 dev_priv->display.update_wm = sandybridge_update_wm;
3857 dev_priv->display.update_sprite_wm = sandybridge_update_sprite_wm;
3858 } else {
3859 DRM_DEBUG_KMS("Failed to read display plane latency. "
3860 "Disable CxSR\n");
3861 dev_priv->display.update_wm = NULL;
3862 }
3863 dev_priv->display.init_clock_gating = ivybridge_init_clock_gating;
3864 dev_priv->display.sanitize_pm = gen6_sanitize_pm;
3865 } else if (IS_HASWELL(dev)) {
3866 if (SNB_READ_WM0_LATENCY()) {
3867 dev_priv->display.update_wm = sandybridge_update_wm;
3868 dev_priv->display.update_sprite_wm = sandybridge_update_sprite_wm;
3869 dev_priv->display.update_linetime_wm = haswell_update_linetime_wm;
3870 } else {
3871 DRM_DEBUG_KMS("Failed to read display plane latency. "
3872 "Disable CxSR\n");
3873 dev_priv->display.update_wm = NULL;
3874 }
3875 dev_priv->display.init_clock_gating = haswell_init_clock_gating;
3876 dev_priv->display.sanitize_pm = gen6_sanitize_pm;
3877 } else
3878 dev_priv->display.update_wm = NULL;
3879 } else if (IS_VALLEYVIEW(dev)) {
3880 dev_priv->display.update_wm = valleyview_update_wm;
3881 dev_priv->display.init_clock_gating =
3882 valleyview_init_clock_gating;
3883 } else if (IS_PINEVIEW(dev)) {
3884 if (!intel_get_cxsr_latency(IS_PINEVIEW_G(dev),
3885 dev_priv->is_ddr3,
3886 dev_priv->fsb_freq,
3887 dev_priv->mem_freq)) {
3888 DRM_INFO("failed to find known CxSR latency "
3889 "(found ddr%s fsb freq %d, mem freq %d), "
3890 "disabling CxSR\n",
3891 (dev_priv->is_ddr3 == 1) ? "3" : "2",
3892 dev_priv->fsb_freq, dev_priv->mem_freq);
3893 /* Disable CxSR and never update its watermark again */
3894 pineview_disable_cxsr(dev);
3895 dev_priv->display.update_wm = NULL;
3896 } else
3897 dev_priv->display.update_wm = pineview_update_wm;
3898 dev_priv->display.init_clock_gating = gen3_init_clock_gating;
3899 } else if (IS_G4X(dev)) {
3900 dev_priv->display.update_wm = g4x_update_wm;
3901 dev_priv->display.init_clock_gating = g4x_init_clock_gating;
3902 } else if (IS_GEN4(dev)) {
3903 dev_priv->display.update_wm = i965_update_wm;
3904 if (IS_CRESTLINE(dev))
3905 dev_priv->display.init_clock_gating = crestline_init_clock_gating;
3906 else if (IS_BROADWATER(dev))
3907 dev_priv->display.init_clock_gating = broadwater_init_clock_gating;
3908 } else if (IS_GEN3(dev)) {
3909 dev_priv->display.update_wm = i9xx_update_wm;
3910 dev_priv->display.get_fifo_size = i9xx_get_fifo_size;
3911 dev_priv->display.init_clock_gating = gen3_init_clock_gating;
3912 } else if (IS_I865G(dev)) {
3913 dev_priv->display.update_wm = i830_update_wm;
3914 dev_priv->display.init_clock_gating = i85x_init_clock_gating;
3915 dev_priv->display.get_fifo_size = i830_get_fifo_size;
3916 } else if (IS_I85X(dev)) {
3917 dev_priv->display.update_wm = i9xx_update_wm;
3918 dev_priv->display.get_fifo_size = i85x_get_fifo_size;
3919 dev_priv->display.init_clock_gating = i85x_init_clock_gating;
3920 } else {
3921 dev_priv->display.update_wm = i830_update_wm;
3922 dev_priv->display.init_clock_gating = i830_init_clock_gating;
3923 if (IS_845G(dev))
3924 dev_priv->display.get_fifo_size = i845_get_fifo_size;
3925 else
3926 dev_priv->display.get_fifo_size = i830_get_fifo_size;
3927 }
3928 }
3929
3930 static void __gen6_gt_wait_for_thread_c0(struct drm_i915_private *dev_priv)
3931 {
3932 u32 gt_thread_status_mask;
3933
3934 if (IS_HASWELL(dev_priv->dev))
3935 gt_thread_status_mask = GEN6_GT_THREAD_STATUS_CORE_MASK_HSW;
3936 else
3937 gt_thread_status_mask = GEN6_GT_THREAD_STATUS_CORE_MASK;
3938
3939 /* w/a for a sporadic read returning 0 by waiting for the GT
3940 * thread to wake up.
3941 */
3942 if (wait_for_atomic_us((I915_READ_NOTRACE(GEN6_GT_THREAD_STATUS_REG) & gt_thread_status_mask) == 0, 500))
3943 DRM_ERROR("GT thread status wait timed out\n");
3944 }
3945
3946 static void __gen6_gt_force_wake_get(struct drm_i915_private *dev_priv)
3947 {
3948 u32 forcewake_ack;
3949
3950 if (IS_HASWELL(dev_priv->dev))
3951 forcewake_ack = FORCEWAKE_ACK_HSW;
3952 else
3953 forcewake_ack = FORCEWAKE_ACK;
3954
3955 if (wait_for_atomic_us((I915_READ_NOTRACE(forcewake_ack) & 1) == 0, 500))
3956 DRM_ERROR("Force wake wait timed out\n");
3957
3958 I915_WRITE_NOTRACE(FORCEWAKE, 1);
3959 POSTING_READ(FORCEWAKE);
3960
3961 if (wait_for_atomic_us((I915_READ_NOTRACE(forcewake_ack) & 1), 500))
3962 DRM_ERROR("Force wake wait timed out\n");
3963
3964 __gen6_gt_wait_for_thread_c0(dev_priv);
3965 }
3966
3967 static void __gen6_gt_force_wake_mt_get(struct drm_i915_private *dev_priv)
3968 {
3969 u32 forcewake_ack;
3970
3971 if (IS_HASWELL(dev_priv->dev))
3972 forcewake_ack = FORCEWAKE_ACK_HSW;
3973 else
3974 forcewake_ack = FORCEWAKE_MT_ACK;
3975
3976 if (wait_for_atomic_us((I915_READ_NOTRACE(forcewake_ack) & 1) == 0, 500))
3977 DRM_ERROR("Force wake wait timed out\n");
3978
3979 I915_WRITE_NOTRACE(FORCEWAKE_MT, _MASKED_BIT_ENABLE(1));
3980 POSTING_READ(FORCEWAKE_MT);
3981
3982 if (wait_for_atomic_us((I915_READ_NOTRACE(forcewake_ack) & 1), 500))
3983 DRM_ERROR("Force wake wait timed out\n");
3984
3985 __gen6_gt_wait_for_thread_c0(dev_priv);
3986 }
3987
3988 /*
3989 * Generally this is called implicitly by the register read function. However,
3990 * if some sequence requires the GT to not power down then this function should
3991 * be called at the beginning of the sequence followed by a call to
3992 * gen6_gt_force_wake_put() at the end of the sequence.
3993 */
3994 void gen6_gt_force_wake_get(struct drm_i915_private *dev_priv)
3995 {
3996 unsigned long irqflags;
3997
3998 spin_lock_irqsave(&dev_priv->gt_lock, irqflags);
3999 if (dev_priv->forcewake_count++ == 0)
4000 dev_priv->gt.force_wake_get(dev_priv);
4001 spin_unlock_irqrestore(&dev_priv->gt_lock, irqflags);
4002 }
4003
4004 void gen6_gt_check_fifodbg(struct drm_i915_private *dev_priv)
4005 {
4006 u32 gtfifodbg;
4007 gtfifodbg = I915_READ_NOTRACE(GTFIFODBG);
4008 if (WARN(gtfifodbg & GT_FIFO_CPU_ERROR_MASK,
4009 "MMIO read or write has been dropped %x\n", gtfifodbg))
4010 I915_WRITE_NOTRACE(GTFIFODBG, GT_FIFO_CPU_ERROR_MASK);
4011 }
4012
4013 static void __gen6_gt_force_wake_put(struct drm_i915_private *dev_priv)
4014 {
4015 I915_WRITE_NOTRACE(FORCEWAKE, 0);
4016 POSTING_READ(FORCEWAKE);
4017 gen6_gt_check_fifodbg(dev_priv);
4018 }
4019
4020 static void __gen6_gt_force_wake_mt_put(struct drm_i915_private *dev_priv)
4021 {
4022 I915_WRITE_NOTRACE(FORCEWAKE_MT, _MASKED_BIT_DISABLE(1));
4023 POSTING_READ(FORCEWAKE_MT);
4024 gen6_gt_check_fifodbg(dev_priv);
4025 }
4026
4027 /*
4028 * see gen6_gt_force_wake_get()
4029 */
4030 void gen6_gt_force_wake_put(struct drm_i915_private *dev_priv)
4031 {
4032 unsigned long irqflags;
4033
4034 spin_lock_irqsave(&dev_priv->gt_lock, irqflags);
4035 if (--dev_priv->forcewake_count == 0)
4036 dev_priv->gt.force_wake_put(dev_priv);
4037 spin_unlock_irqrestore(&dev_priv->gt_lock, irqflags);
4038 }
4039
4040 int __gen6_gt_wait_for_fifo(struct drm_i915_private *dev_priv)
4041 {
4042 int ret = 0;
4043
4044 if (dev_priv->gt_fifo_count < GT_FIFO_NUM_RESERVED_ENTRIES) {
4045 int loop = 500;
4046 u32 fifo = I915_READ_NOTRACE(GT_FIFO_FREE_ENTRIES);
4047 while (fifo <= GT_FIFO_NUM_RESERVED_ENTRIES && loop--) {
4048 udelay(10);
4049 fifo = I915_READ_NOTRACE(GT_FIFO_FREE_ENTRIES);
4050 }
4051 if (WARN_ON(loop < 0 && fifo <= GT_FIFO_NUM_RESERVED_ENTRIES))
4052 ++ret;
4053 dev_priv->gt_fifo_count = fifo;
4054 }
4055 dev_priv->gt_fifo_count--;
4056
4057 return ret;
4058 }
4059
4060 static void vlv_force_wake_get(struct drm_i915_private *dev_priv)
4061 {
4062 /* Already awake? */
4063 if ((I915_READ(0x130094) & 0xa1) == 0xa1)
4064 return;
4065
4066 I915_WRITE_NOTRACE(FORCEWAKE_VLV, 0xffffffff);
4067 POSTING_READ(FORCEWAKE_VLV);
4068
4069 if (wait_for_atomic_us((I915_READ_NOTRACE(FORCEWAKE_ACK_VLV) & 1), 500))
4070 DRM_ERROR("Force wake wait timed out\n");
4071
4072 __gen6_gt_wait_for_thread_c0(dev_priv);
4073 }
4074
4075 static void vlv_force_wake_put(struct drm_i915_private *dev_priv)
4076 {
4077 I915_WRITE_NOTRACE(FORCEWAKE_VLV, 0xffff0000);
4078 /* FIXME: confirm VLV behavior with Punit folks */
4079 POSTING_READ(FORCEWAKE_VLV);
4080 }
4081
4082 void intel_gt_init(struct drm_device *dev)
4083 {
4084 struct drm_i915_private *dev_priv = dev->dev_private;
4085
4086 spin_lock_init(&dev_priv->gt_lock);
4087
4088 if (IS_VALLEYVIEW(dev)) {
4089 dev_priv->gt.force_wake_get = vlv_force_wake_get;
4090 dev_priv->gt.force_wake_put = vlv_force_wake_put;
4091 } else if (INTEL_INFO(dev)->gen >= 6) {
4092 dev_priv->gt.force_wake_get = __gen6_gt_force_wake_get;
4093 dev_priv->gt.force_wake_put = __gen6_gt_force_wake_put;
4094
4095 /* IVB configs may use multi-threaded forcewake */
4096 if (IS_IVYBRIDGE(dev) || IS_HASWELL(dev)) {
4097 u32 ecobus;
4098
4099 /* A small trick here - if the bios hasn't configured
4100 * MT forcewake, and if the device is in RC6, then
4101 * force_wake_mt_get will not wake the device and the
4102 * ECOBUS read will return zero. Which will be
4103 * (correctly) interpreted by the test below as MT
4104 * forcewake being disabled.
4105 */
4106 mutex_lock(&dev->struct_mutex);
4107 __gen6_gt_force_wake_mt_get(dev_priv);
4108 ecobus = I915_READ_NOTRACE(ECOBUS);
4109 __gen6_gt_force_wake_mt_put(dev_priv);
4110 mutex_unlock(&dev->struct_mutex);
4111
4112 if (ecobus & FORCEWAKE_MT_ENABLE) {
4113 DRM_DEBUG_KMS("Using MT version of forcewake\n");
4114 dev_priv->gt.force_wake_get =
4115 __gen6_gt_force_wake_mt_get;
4116 dev_priv->gt.force_wake_put =
4117 __gen6_gt_force_wake_mt_put;
4118 }
4119 }
4120 }
4121 }
4122
Linux kernel - Deliverables
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