2 * Copyright © 2006-2010 Intel Corporation
3 * Copyright (c) 2006 Dave Airlie <airlied@linux.ie>
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
12 * The above copyright notice and this permission notice (including the next
13 * paragraph) shall be included in all copies or substantial portions of the
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22 * DEALINGS IN THE SOFTWARE.
25 * Eric Anholt <eric@anholt.net>
26 * Dave Airlie <airlied@linux.ie>
27 * Jesse Barnes <jesse.barnes@intel.com>
28 * Chris Wilson <chris@chris-wilson.co.uk>
31 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
33 #include <linux/kernel.h>
34 #include <linux/moduleparam.h>
35 #include <linux/pwm.h>
36 #include "intel_drv.h"
38 #define CRC_PMIC_PWM_PERIOD_NS 21333
41 intel_fixed_panel_mode(const struct drm_display_mode
*fixed_mode
,
42 struct drm_display_mode
*adjusted_mode
)
44 drm_mode_copy(adjusted_mode
, fixed_mode
);
46 drm_mode_set_crtcinfo(adjusted_mode
, 0);
50 * intel_find_panel_downclock - find the reduced downclock for LVDS in EDID
52 * @fixed_mode : panel native mode
53 * @connector: LVDS/eDP connector
55 * Return downclock_avail
56 * Find the reduced downclock for LVDS/eDP in EDID.
58 struct drm_display_mode
*
59 intel_find_panel_downclock(struct drm_device
*dev
,
60 struct drm_display_mode
*fixed_mode
,
61 struct drm_connector
*connector
)
63 struct drm_display_mode
*scan
, *tmp_mode
;
66 temp_downclock
= fixed_mode
->clock
;
69 list_for_each_entry(scan
, &connector
->probed_modes
, head
) {
71 * If one mode has the same resolution with the fixed_panel
72 * mode while they have the different refresh rate, it means
73 * that the reduced downclock is found. In such
74 * case we can set the different FPx0/1 to dynamically select
75 * between low and high frequency.
77 if (scan
->hdisplay
== fixed_mode
->hdisplay
&&
78 scan
->hsync_start
== fixed_mode
->hsync_start
&&
79 scan
->hsync_end
== fixed_mode
->hsync_end
&&
80 scan
->htotal
== fixed_mode
->htotal
&&
81 scan
->vdisplay
== fixed_mode
->vdisplay
&&
82 scan
->vsync_start
== fixed_mode
->vsync_start
&&
83 scan
->vsync_end
== fixed_mode
->vsync_end
&&
84 scan
->vtotal
== fixed_mode
->vtotal
) {
85 if (scan
->clock
< temp_downclock
) {
87 * The downclock is already found. But we
88 * expect to find the lower downclock.
90 temp_downclock
= scan
->clock
;
96 if (temp_downclock
< fixed_mode
->clock
)
97 return drm_mode_duplicate(dev
, tmp_mode
);
102 /* adjusted_mode has been preset to be the panel's fixed mode */
104 intel_pch_panel_fitting(struct intel_crtc
*intel_crtc
,
105 struct intel_crtc_state
*pipe_config
,
108 struct drm_display_mode
*adjusted_mode
;
109 int x
, y
, width
, height
;
111 adjusted_mode
= &pipe_config
->base
.adjusted_mode
;
113 x
= y
= width
= height
= 0;
115 /* Native modes don't need fitting */
116 if (adjusted_mode
->crtc_hdisplay
== pipe_config
->pipe_src_w
&&
117 adjusted_mode
->crtc_vdisplay
== pipe_config
->pipe_src_h
)
120 switch (fitting_mode
) {
121 case DRM_MODE_SCALE_CENTER
:
122 width
= pipe_config
->pipe_src_w
;
123 height
= pipe_config
->pipe_src_h
;
124 x
= (adjusted_mode
->crtc_hdisplay
- width
+ 1)/2;
125 y
= (adjusted_mode
->crtc_vdisplay
- height
+ 1)/2;
128 case DRM_MODE_SCALE_ASPECT
:
129 /* Scale but preserve the aspect ratio */
131 u32 scaled_width
= adjusted_mode
->crtc_hdisplay
132 * pipe_config
->pipe_src_h
;
133 u32 scaled_height
= pipe_config
->pipe_src_w
134 * adjusted_mode
->crtc_vdisplay
;
135 if (scaled_width
> scaled_height
) { /* pillar */
136 width
= scaled_height
/ pipe_config
->pipe_src_h
;
139 x
= (adjusted_mode
->crtc_hdisplay
- width
+ 1) / 2;
141 height
= adjusted_mode
->crtc_vdisplay
;
142 } else if (scaled_width
< scaled_height
) { /* letter */
143 height
= scaled_width
/ pipe_config
->pipe_src_w
;
146 y
= (adjusted_mode
->crtc_vdisplay
- height
+ 1) / 2;
148 width
= adjusted_mode
->crtc_hdisplay
;
151 width
= adjusted_mode
->crtc_hdisplay
;
152 height
= adjusted_mode
->crtc_vdisplay
;
157 case DRM_MODE_SCALE_FULLSCREEN
:
159 width
= adjusted_mode
->crtc_hdisplay
;
160 height
= adjusted_mode
->crtc_vdisplay
;
164 WARN(1, "bad panel fit mode: %d\n", fitting_mode
);
169 pipe_config
->pch_pfit
.pos
= (x
<< 16) | y
;
170 pipe_config
->pch_pfit
.size
= (width
<< 16) | height
;
171 pipe_config
->pch_pfit
.enabled
= pipe_config
->pch_pfit
.size
!= 0;
175 centre_horizontally(struct drm_display_mode
*adjusted_mode
,
178 u32 border
, sync_pos
, blank_width
, sync_width
;
180 /* keep the hsync and hblank widths constant */
181 sync_width
= adjusted_mode
->crtc_hsync_end
- adjusted_mode
->crtc_hsync_start
;
182 blank_width
= adjusted_mode
->crtc_hblank_end
- adjusted_mode
->crtc_hblank_start
;
183 sync_pos
= (blank_width
- sync_width
+ 1) / 2;
185 border
= (adjusted_mode
->crtc_hdisplay
- width
+ 1) / 2;
186 border
+= border
& 1; /* make the border even */
188 adjusted_mode
->crtc_hdisplay
= width
;
189 adjusted_mode
->crtc_hblank_start
= width
+ border
;
190 adjusted_mode
->crtc_hblank_end
= adjusted_mode
->crtc_hblank_start
+ blank_width
;
192 adjusted_mode
->crtc_hsync_start
= adjusted_mode
->crtc_hblank_start
+ sync_pos
;
193 adjusted_mode
->crtc_hsync_end
= adjusted_mode
->crtc_hsync_start
+ sync_width
;
197 centre_vertically(struct drm_display_mode
*adjusted_mode
,
200 u32 border
, sync_pos
, blank_width
, sync_width
;
202 /* keep the vsync and vblank widths constant */
203 sync_width
= adjusted_mode
->crtc_vsync_end
- adjusted_mode
->crtc_vsync_start
;
204 blank_width
= adjusted_mode
->crtc_vblank_end
- adjusted_mode
->crtc_vblank_start
;
205 sync_pos
= (blank_width
- sync_width
+ 1) / 2;
207 border
= (adjusted_mode
->crtc_vdisplay
- height
+ 1) / 2;
209 adjusted_mode
->crtc_vdisplay
= height
;
210 adjusted_mode
->crtc_vblank_start
= height
+ border
;
211 adjusted_mode
->crtc_vblank_end
= adjusted_mode
->crtc_vblank_start
+ blank_width
;
213 adjusted_mode
->crtc_vsync_start
= adjusted_mode
->crtc_vblank_start
+ sync_pos
;
214 adjusted_mode
->crtc_vsync_end
= adjusted_mode
->crtc_vsync_start
+ sync_width
;
217 static inline u32
panel_fitter_scaling(u32 source
, u32 target
)
220 * Floating point operation is not supported. So the FACTOR
221 * is defined, which can avoid the floating point computation
222 * when calculating the panel ratio.
225 #define FACTOR (1 << ACCURACY)
226 u32 ratio
= source
* FACTOR
/ target
;
227 return (FACTOR
* ratio
+ FACTOR
/2) / FACTOR
;
230 static void i965_scale_aspect(struct intel_crtc_state
*pipe_config
,
233 struct drm_display_mode
*adjusted_mode
= &pipe_config
->base
.adjusted_mode
;
234 u32 scaled_width
= adjusted_mode
->crtc_hdisplay
*
235 pipe_config
->pipe_src_h
;
236 u32 scaled_height
= pipe_config
->pipe_src_w
*
237 adjusted_mode
->crtc_vdisplay
;
239 /* 965+ is easy, it does everything in hw */
240 if (scaled_width
> scaled_height
)
241 *pfit_control
|= PFIT_ENABLE
|
243 else if (scaled_width
< scaled_height
)
244 *pfit_control
|= PFIT_ENABLE
|
246 else if (adjusted_mode
->crtc_hdisplay
!= pipe_config
->pipe_src_w
)
247 *pfit_control
|= PFIT_ENABLE
| PFIT_SCALING_AUTO
;
250 static void i9xx_scale_aspect(struct intel_crtc_state
*pipe_config
,
251 u32
*pfit_control
, u32
*pfit_pgm_ratios
,
254 struct drm_display_mode
*adjusted_mode
= &pipe_config
->base
.adjusted_mode
;
255 u32 scaled_width
= adjusted_mode
->crtc_hdisplay
*
256 pipe_config
->pipe_src_h
;
257 u32 scaled_height
= pipe_config
->pipe_src_w
*
258 adjusted_mode
->crtc_vdisplay
;
262 * For earlier chips we have to calculate the scaling
263 * ratio by hand and program it into the
264 * PFIT_PGM_RATIO register
266 if (scaled_width
> scaled_height
) { /* pillar */
267 centre_horizontally(adjusted_mode
,
269 pipe_config
->pipe_src_h
);
271 *border
= LVDS_BORDER_ENABLE
;
272 if (pipe_config
->pipe_src_h
!= adjusted_mode
->crtc_vdisplay
) {
273 bits
= panel_fitter_scaling(pipe_config
->pipe_src_h
,
274 adjusted_mode
->crtc_vdisplay
);
276 *pfit_pgm_ratios
|= (bits
<< PFIT_HORIZ_SCALE_SHIFT
|
277 bits
<< PFIT_VERT_SCALE_SHIFT
);
278 *pfit_control
|= (PFIT_ENABLE
|
279 VERT_INTERP_BILINEAR
|
280 HORIZ_INTERP_BILINEAR
);
282 } else if (scaled_width
< scaled_height
) { /* letter */
283 centre_vertically(adjusted_mode
,
285 pipe_config
->pipe_src_w
);
287 *border
= LVDS_BORDER_ENABLE
;
288 if (pipe_config
->pipe_src_w
!= adjusted_mode
->crtc_hdisplay
) {
289 bits
= panel_fitter_scaling(pipe_config
->pipe_src_w
,
290 adjusted_mode
->crtc_hdisplay
);
292 *pfit_pgm_ratios
|= (bits
<< PFIT_HORIZ_SCALE_SHIFT
|
293 bits
<< PFIT_VERT_SCALE_SHIFT
);
294 *pfit_control
|= (PFIT_ENABLE
|
295 VERT_INTERP_BILINEAR
|
296 HORIZ_INTERP_BILINEAR
);
299 /* Aspects match, Let hw scale both directions */
300 *pfit_control
|= (PFIT_ENABLE
|
301 VERT_AUTO_SCALE
| HORIZ_AUTO_SCALE
|
302 VERT_INTERP_BILINEAR
|
303 HORIZ_INTERP_BILINEAR
);
307 void intel_gmch_panel_fitting(struct intel_crtc
*intel_crtc
,
308 struct intel_crtc_state
*pipe_config
,
311 struct drm_device
*dev
= intel_crtc
->base
.dev
;
312 u32 pfit_control
= 0, pfit_pgm_ratios
= 0, border
= 0;
313 struct drm_display_mode
*adjusted_mode
;
315 adjusted_mode
= &pipe_config
->base
.adjusted_mode
;
317 /* Native modes don't need fitting */
318 if (adjusted_mode
->crtc_hdisplay
== pipe_config
->pipe_src_w
&&
319 adjusted_mode
->crtc_vdisplay
== pipe_config
->pipe_src_h
)
322 switch (fitting_mode
) {
323 case DRM_MODE_SCALE_CENTER
:
325 * For centered modes, we have to calculate border widths &
326 * heights and modify the values programmed into the CRTC.
328 centre_horizontally(adjusted_mode
, pipe_config
->pipe_src_w
);
329 centre_vertically(adjusted_mode
, pipe_config
->pipe_src_h
);
330 border
= LVDS_BORDER_ENABLE
;
332 case DRM_MODE_SCALE_ASPECT
:
333 /* Scale but preserve the aspect ratio */
334 if (INTEL_INFO(dev
)->gen
>= 4)
335 i965_scale_aspect(pipe_config
, &pfit_control
);
337 i9xx_scale_aspect(pipe_config
, &pfit_control
,
338 &pfit_pgm_ratios
, &border
);
340 case DRM_MODE_SCALE_FULLSCREEN
:
342 * Full scaling, even if it changes the aspect ratio.
343 * Fortunately this is all done for us in hw.
345 if (pipe_config
->pipe_src_h
!= adjusted_mode
->crtc_vdisplay
||
346 pipe_config
->pipe_src_w
!= adjusted_mode
->crtc_hdisplay
) {
347 pfit_control
|= PFIT_ENABLE
;
348 if (INTEL_INFO(dev
)->gen
>= 4)
349 pfit_control
|= PFIT_SCALING_AUTO
;
351 pfit_control
|= (VERT_AUTO_SCALE
|
352 VERT_INTERP_BILINEAR
|
354 HORIZ_INTERP_BILINEAR
);
358 WARN(1, "bad panel fit mode: %d\n", fitting_mode
);
362 /* 965+ wants fuzzy fitting */
363 /* FIXME: handle multiple panels by failing gracefully */
364 if (INTEL_INFO(dev
)->gen
>= 4)
365 pfit_control
|= ((intel_crtc
->pipe
<< PFIT_PIPE_SHIFT
) |
369 if ((pfit_control
& PFIT_ENABLE
) == 0) {
374 /* Make sure pre-965 set dither correctly for 18bpp panels. */
375 if (INTEL_INFO(dev
)->gen
< 4 && pipe_config
->pipe_bpp
== 18)
376 pfit_control
|= PANEL_8TO6_DITHER_ENABLE
;
378 pipe_config
->gmch_pfit
.control
= pfit_control
;
379 pipe_config
->gmch_pfit
.pgm_ratios
= pfit_pgm_ratios
;
380 pipe_config
->gmch_pfit
.lvds_border_bits
= border
;
383 enum drm_connector_status
384 intel_panel_detect(struct drm_device
*dev
)
386 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
388 /* Assume that the BIOS does not lie through the OpRegion... */
389 if (!i915
.panel_ignore_lid
&& dev_priv
->opregion
.lid_state
) {
390 return ioread32(dev_priv
->opregion
.lid_state
) & 0x1 ?
391 connector_status_connected
:
392 connector_status_disconnected
;
395 switch (i915
.panel_ignore_lid
) {
397 return connector_status_connected
;
399 return connector_status_disconnected
;
401 return connector_status_unknown
;
406 * scale - scale values from one range to another
408 * @source_val: value in range [@source_min..@source_max]
410 * Return @source_val in range [@source_min..@source_max] scaled to range
411 * [@target_min..@target_max].
413 static uint32_t scale(uint32_t source_val
,
414 uint32_t source_min
, uint32_t source_max
,
415 uint32_t target_min
, uint32_t target_max
)
419 WARN_ON(source_min
> source_max
);
420 WARN_ON(target_min
> target_max
);
423 source_val
= clamp(source_val
, source_min
, source_max
);
425 /* avoid overflows */
426 target_val
= DIV_ROUND_CLOSEST_ULL((uint64_t)(source_val
- source_min
) *
427 (target_max
- target_min
), source_max
- source_min
);
428 target_val
+= target_min
;
433 /* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */
434 static inline u32
scale_user_to_hw(struct intel_connector
*connector
,
435 u32 user_level
, u32 user_max
)
437 struct intel_panel
*panel
= &connector
->panel
;
439 return scale(user_level
, 0, user_max
,
440 panel
->backlight
.min
, panel
->backlight
.max
);
443 /* Scale user_level in range [0..user_max] to [0..hw_max], clamping the result
444 * to [hw_min..hw_max]. */
445 static inline u32
clamp_user_to_hw(struct intel_connector
*connector
,
446 u32 user_level
, u32 user_max
)
448 struct intel_panel
*panel
= &connector
->panel
;
451 hw_level
= scale(user_level
, 0, user_max
, 0, panel
->backlight
.max
);
452 hw_level
= clamp(hw_level
, panel
->backlight
.min
, panel
->backlight
.max
);
457 /* Scale hw_level in range [hw_min..hw_max] to [0..user_max]. */
458 static inline u32
scale_hw_to_user(struct intel_connector
*connector
,
459 u32 hw_level
, u32 user_max
)
461 struct intel_panel
*panel
= &connector
->panel
;
463 return scale(hw_level
, panel
->backlight
.min
, panel
->backlight
.max
,
467 static u32
intel_panel_compute_brightness(struct intel_connector
*connector
,
470 struct drm_device
*dev
= connector
->base
.dev
;
471 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
472 struct intel_panel
*panel
= &connector
->panel
;
474 WARN_ON(panel
->backlight
.max
== 0);
476 if (i915
.invert_brightness
< 0)
479 if (i915
.invert_brightness
> 0 ||
480 dev_priv
->quirks
& QUIRK_INVERT_BRIGHTNESS
) {
481 return panel
->backlight
.max
- val
;
487 static u32
lpt_get_backlight(struct intel_connector
*connector
)
489 struct drm_device
*dev
= connector
->base
.dev
;
490 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
492 return I915_READ(BLC_PWM_PCH_CTL2
) & BACKLIGHT_DUTY_CYCLE_MASK
;
495 static u32
pch_get_backlight(struct intel_connector
*connector
)
497 struct drm_device
*dev
= connector
->base
.dev
;
498 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
500 return I915_READ(BLC_PWM_CPU_CTL
) & BACKLIGHT_DUTY_CYCLE_MASK
;
503 static u32
i9xx_get_backlight(struct intel_connector
*connector
)
505 struct drm_device
*dev
= connector
->base
.dev
;
506 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
507 struct intel_panel
*panel
= &connector
->panel
;
510 val
= I915_READ(BLC_PWM_CTL
) & BACKLIGHT_DUTY_CYCLE_MASK
;
511 if (INTEL_INFO(dev
)->gen
< 4)
514 if (panel
->backlight
.combination_mode
) {
517 pci_read_config_byte(dev
->pdev
, PCI_LBPC
, &lbpc
);
524 static u32
_vlv_get_backlight(struct drm_device
*dev
, enum pipe pipe
)
526 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
528 if (WARN_ON(pipe
!= PIPE_A
&& pipe
!= PIPE_B
))
531 return I915_READ(VLV_BLC_PWM_CTL(pipe
)) & BACKLIGHT_DUTY_CYCLE_MASK
;
534 static u32
vlv_get_backlight(struct intel_connector
*connector
)
536 struct drm_device
*dev
= connector
->base
.dev
;
537 enum pipe pipe
= intel_get_pipe_from_connector(connector
);
539 return _vlv_get_backlight(dev
, pipe
);
542 static u32
bxt_get_backlight(struct intel_connector
*connector
)
544 struct drm_device
*dev
= connector
->base
.dev
;
545 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
547 return I915_READ(BXT_BLC_PWM_DUTY1
);
550 static u32
pwm_get_backlight(struct intel_connector
*connector
)
552 struct intel_panel
*panel
= &connector
->panel
;
555 duty_ns
= pwm_get_duty_cycle(panel
->backlight
.pwm
);
556 return DIV_ROUND_UP(duty_ns
* 100, CRC_PMIC_PWM_PERIOD_NS
);
559 static u32
intel_panel_get_backlight(struct intel_connector
*connector
)
561 struct drm_device
*dev
= connector
->base
.dev
;
562 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
563 struct intel_panel
*panel
= &connector
->panel
;
566 mutex_lock(&dev_priv
->backlight_lock
);
568 if (panel
->backlight
.enabled
) {
569 val
= dev_priv
->display
.get_backlight(connector
);
570 val
= intel_panel_compute_brightness(connector
, val
);
573 mutex_unlock(&dev_priv
->backlight_lock
);
575 DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val
);
579 static void lpt_set_backlight(struct intel_connector
*connector
, u32 level
)
581 struct drm_device
*dev
= connector
->base
.dev
;
582 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
583 u32 val
= I915_READ(BLC_PWM_PCH_CTL2
) & ~BACKLIGHT_DUTY_CYCLE_MASK
;
584 I915_WRITE(BLC_PWM_PCH_CTL2
, val
| level
);
587 static void pch_set_backlight(struct intel_connector
*connector
, u32 level
)
589 struct drm_device
*dev
= connector
->base
.dev
;
590 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
593 tmp
= I915_READ(BLC_PWM_CPU_CTL
) & ~BACKLIGHT_DUTY_CYCLE_MASK
;
594 I915_WRITE(BLC_PWM_CPU_CTL
, tmp
| level
);
597 static void i9xx_set_backlight(struct intel_connector
*connector
, u32 level
)
599 struct drm_device
*dev
= connector
->base
.dev
;
600 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
601 struct intel_panel
*panel
= &connector
->panel
;
604 WARN_ON(panel
->backlight
.max
== 0);
606 if (panel
->backlight
.combination_mode
) {
609 lbpc
= level
* 0xfe / panel
->backlight
.max
+ 1;
611 pci_write_config_byte(dev
->pdev
, PCI_LBPC
, lbpc
);
615 mask
= BACKLIGHT_DUTY_CYCLE_MASK
;
618 mask
= BACKLIGHT_DUTY_CYCLE_MASK_PNV
;
621 tmp
= I915_READ(BLC_PWM_CTL
) & ~mask
;
622 I915_WRITE(BLC_PWM_CTL
, tmp
| level
);
625 static void vlv_set_backlight(struct intel_connector
*connector
, u32 level
)
627 struct drm_device
*dev
= connector
->base
.dev
;
628 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
629 enum pipe pipe
= intel_get_pipe_from_connector(connector
);
632 if (WARN_ON(pipe
!= PIPE_A
&& pipe
!= PIPE_B
))
635 tmp
= I915_READ(VLV_BLC_PWM_CTL(pipe
)) & ~BACKLIGHT_DUTY_CYCLE_MASK
;
636 I915_WRITE(VLV_BLC_PWM_CTL(pipe
), tmp
| level
);
639 static void bxt_set_backlight(struct intel_connector
*connector
, u32 level
)
641 struct drm_device
*dev
= connector
->base
.dev
;
642 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
644 I915_WRITE(BXT_BLC_PWM_DUTY1
, level
);
647 static void pwm_set_backlight(struct intel_connector
*connector
, u32 level
)
649 struct intel_panel
*panel
= &connector
->panel
;
650 int duty_ns
= DIV_ROUND_UP(level
* CRC_PMIC_PWM_PERIOD_NS
, 100);
652 pwm_config(panel
->backlight
.pwm
, duty_ns
, CRC_PMIC_PWM_PERIOD_NS
);
656 intel_panel_actually_set_backlight(struct intel_connector
*connector
, u32 level
)
658 struct drm_device
*dev
= connector
->base
.dev
;
659 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
661 DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level
);
663 level
= intel_panel_compute_brightness(connector
, level
);
664 dev_priv
->display
.set_backlight(connector
, level
);
667 /* set backlight brightness to level in range [0..max], scaling wrt hw min */
668 static void intel_panel_set_backlight(struct intel_connector
*connector
,
669 u32 user_level
, u32 user_max
)
671 struct drm_device
*dev
= connector
->base
.dev
;
672 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
673 struct intel_panel
*panel
= &connector
->panel
;
676 if (!panel
->backlight
.present
)
679 mutex_lock(&dev_priv
->backlight_lock
);
681 WARN_ON(panel
->backlight
.max
== 0);
683 hw_level
= scale_user_to_hw(connector
, user_level
, user_max
);
684 panel
->backlight
.level
= hw_level
;
686 if (panel
->backlight
.enabled
)
687 intel_panel_actually_set_backlight(connector
, hw_level
);
689 mutex_unlock(&dev_priv
->backlight_lock
);
692 /* set backlight brightness to level in range [0..max], assuming hw min is
695 void intel_panel_set_backlight_acpi(struct intel_connector
*connector
,
696 u32 user_level
, u32 user_max
)
698 struct drm_device
*dev
= connector
->base
.dev
;
699 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
700 struct intel_panel
*panel
= &connector
->panel
;
701 enum pipe pipe
= intel_get_pipe_from_connector(connector
);
705 * INVALID_PIPE may occur during driver init because
706 * connection_mutex isn't held across the entire backlight
707 * setup + modeset readout, and the BIOS can issue the
708 * requests at any time.
710 if (!panel
->backlight
.present
|| pipe
== INVALID_PIPE
)
713 mutex_lock(&dev_priv
->backlight_lock
);
715 WARN_ON(panel
->backlight
.max
== 0);
717 hw_level
= clamp_user_to_hw(connector
, user_level
, user_max
);
718 panel
->backlight
.level
= hw_level
;
720 if (panel
->backlight
.device
)
721 panel
->backlight
.device
->props
.brightness
=
722 scale_hw_to_user(connector
,
723 panel
->backlight
.level
,
724 panel
->backlight
.device
->props
.max_brightness
);
726 if (panel
->backlight
.enabled
)
727 intel_panel_actually_set_backlight(connector
, hw_level
);
729 mutex_unlock(&dev_priv
->backlight_lock
);
732 static void lpt_disable_backlight(struct intel_connector
*connector
)
734 struct drm_device
*dev
= connector
->base
.dev
;
735 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
738 intel_panel_actually_set_backlight(connector
, 0);
740 tmp
= I915_READ(BLC_PWM_PCH_CTL1
);
741 I915_WRITE(BLC_PWM_PCH_CTL1
, tmp
& ~BLM_PCH_PWM_ENABLE
);
744 static void pch_disable_backlight(struct intel_connector
*connector
)
746 struct drm_device
*dev
= connector
->base
.dev
;
747 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
750 intel_panel_actually_set_backlight(connector
, 0);
752 tmp
= I915_READ(BLC_PWM_CPU_CTL2
);
753 I915_WRITE(BLC_PWM_CPU_CTL2
, tmp
& ~BLM_PWM_ENABLE
);
755 tmp
= I915_READ(BLC_PWM_PCH_CTL1
);
756 I915_WRITE(BLC_PWM_PCH_CTL1
, tmp
& ~BLM_PCH_PWM_ENABLE
);
759 static void i9xx_disable_backlight(struct intel_connector
*connector
)
761 intel_panel_actually_set_backlight(connector
, 0);
764 static void i965_disable_backlight(struct intel_connector
*connector
)
766 struct drm_device
*dev
= connector
->base
.dev
;
767 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
770 intel_panel_actually_set_backlight(connector
, 0);
772 tmp
= I915_READ(BLC_PWM_CTL2
);
773 I915_WRITE(BLC_PWM_CTL2
, tmp
& ~BLM_PWM_ENABLE
);
776 static void vlv_disable_backlight(struct intel_connector
*connector
)
778 struct drm_device
*dev
= connector
->base
.dev
;
779 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
780 enum pipe pipe
= intel_get_pipe_from_connector(connector
);
783 if (WARN_ON(pipe
!= PIPE_A
&& pipe
!= PIPE_B
))
786 intel_panel_actually_set_backlight(connector
, 0);
788 tmp
= I915_READ(VLV_BLC_PWM_CTL2(pipe
));
789 I915_WRITE(VLV_BLC_PWM_CTL2(pipe
), tmp
& ~BLM_PWM_ENABLE
);
792 static void bxt_disable_backlight(struct intel_connector
*connector
)
794 struct drm_device
*dev
= connector
->base
.dev
;
795 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
798 intel_panel_actually_set_backlight(connector
, 0);
800 tmp
= I915_READ(BXT_BLC_PWM_CTL1
);
801 I915_WRITE(BXT_BLC_PWM_CTL1
, tmp
& ~BXT_BLC_PWM_ENABLE
);
804 static void pwm_disable_backlight(struct intel_connector
*connector
)
806 struct intel_panel
*panel
= &connector
->panel
;
808 /* Disable the backlight */
809 pwm_config(panel
->backlight
.pwm
, 0, CRC_PMIC_PWM_PERIOD_NS
);
810 usleep_range(2000, 3000);
811 pwm_disable(panel
->backlight
.pwm
);
814 void intel_panel_disable_backlight(struct intel_connector
*connector
)
816 struct drm_device
*dev
= connector
->base
.dev
;
817 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
818 struct intel_panel
*panel
= &connector
->panel
;
820 if (!panel
->backlight
.present
)
824 * Do not disable backlight on the vga_switcheroo path. When switching
825 * away from i915, the other client may depend on i915 to handle the
826 * backlight. This will leave the backlight on unnecessarily when
827 * another client is not activated.
829 if (dev
->switch_power_state
== DRM_SWITCH_POWER_CHANGING
) {
830 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");
834 mutex_lock(&dev_priv
->backlight_lock
);
836 if (panel
->backlight
.device
)
837 panel
->backlight
.device
->props
.power
= FB_BLANK_POWERDOWN
;
838 panel
->backlight
.enabled
= false;
839 dev_priv
->display
.disable_backlight(connector
);
841 mutex_unlock(&dev_priv
->backlight_lock
);
844 static void lpt_enable_backlight(struct intel_connector
*connector
)
846 struct drm_device
*dev
= connector
->base
.dev
;
847 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
848 struct intel_panel
*panel
= &connector
->panel
;
849 u32 pch_ctl1
, pch_ctl2
;
851 pch_ctl1
= I915_READ(BLC_PWM_PCH_CTL1
);
852 if (pch_ctl1
& BLM_PCH_PWM_ENABLE
) {
853 DRM_DEBUG_KMS("pch backlight already enabled\n");
854 pch_ctl1
&= ~BLM_PCH_PWM_ENABLE
;
855 I915_WRITE(BLC_PWM_PCH_CTL1
, pch_ctl1
);
858 pch_ctl2
= panel
->backlight
.max
<< 16;
859 I915_WRITE(BLC_PWM_PCH_CTL2
, pch_ctl2
);
862 if (panel
->backlight
.active_low_pwm
)
863 pch_ctl1
|= BLM_PCH_POLARITY
;
865 /* After LPT, override is the default. */
866 if (HAS_PCH_LPT(dev_priv
))
867 pch_ctl1
|= BLM_PCH_OVERRIDE_ENABLE
;
869 I915_WRITE(BLC_PWM_PCH_CTL1
, pch_ctl1
);
870 POSTING_READ(BLC_PWM_PCH_CTL1
);
871 I915_WRITE(BLC_PWM_PCH_CTL1
, pch_ctl1
| BLM_PCH_PWM_ENABLE
);
873 /* This won't stick until the above enable. */
874 intel_panel_actually_set_backlight(connector
, panel
->backlight
.level
);
877 static void pch_enable_backlight(struct intel_connector
*connector
)
879 struct drm_device
*dev
= connector
->base
.dev
;
880 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
881 struct intel_panel
*panel
= &connector
->panel
;
882 enum pipe pipe
= intel_get_pipe_from_connector(connector
);
883 enum transcoder cpu_transcoder
=
884 intel_pipe_to_cpu_transcoder(dev_priv
, pipe
);
885 u32 cpu_ctl2
, pch_ctl1
, pch_ctl2
;
887 cpu_ctl2
= I915_READ(BLC_PWM_CPU_CTL2
);
888 if (cpu_ctl2
& BLM_PWM_ENABLE
) {
889 DRM_DEBUG_KMS("cpu backlight already enabled\n");
890 cpu_ctl2
&= ~BLM_PWM_ENABLE
;
891 I915_WRITE(BLC_PWM_CPU_CTL2
, cpu_ctl2
);
894 pch_ctl1
= I915_READ(BLC_PWM_PCH_CTL1
);
895 if (pch_ctl1
& BLM_PCH_PWM_ENABLE
) {
896 DRM_DEBUG_KMS("pch backlight already enabled\n");
897 pch_ctl1
&= ~BLM_PCH_PWM_ENABLE
;
898 I915_WRITE(BLC_PWM_PCH_CTL1
, pch_ctl1
);
901 if (cpu_transcoder
== TRANSCODER_EDP
)
902 cpu_ctl2
= BLM_TRANSCODER_EDP
;
904 cpu_ctl2
= BLM_PIPE(cpu_transcoder
);
905 I915_WRITE(BLC_PWM_CPU_CTL2
, cpu_ctl2
);
906 POSTING_READ(BLC_PWM_CPU_CTL2
);
907 I915_WRITE(BLC_PWM_CPU_CTL2
, cpu_ctl2
| BLM_PWM_ENABLE
);
909 /* This won't stick until the above enable. */
910 intel_panel_actually_set_backlight(connector
, panel
->backlight
.level
);
912 pch_ctl2
= panel
->backlight
.max
<< 16;
913 I915_WRITE(BLC_PWM_PCH_CTL2
, pch_ctl2
);
916 if (panel
->backlight
.active_low_pwm
)
917 pch_ctl1
|= BLM_PCH_POLARITY
;
919 I915_WRITE(BLC_PWM_PCH_CTL1
, pch_ctl1
);
920 POSTING_READ(BLC_PWM_PCH_CTL1
);
921 I915_WRITE(BLC_PWM_PCH_CTL1
, pch_ctl1
| BLM_PCH_PWM_ENABLE
);
924 static void i9xx_enable_backlight(struct intel_connector
*connector
)
926 struct drm_device
*dev
= connector
->base
.dev
;
927 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
928 struct intel_panel
*panel
= &connector
->panel
;
931 ctl
= I915_READ(BLC_PWM_CTL
);
932 if (ctl
& BACKLIGHT_DUTY_CYCLE_MASK_PNV
) {
933 DRM_DEBUG_KMS("backlight already enabled\n");
934 I915_WRITE(BLC_PWM_CTL
, 0);
937 freq
= panel
->backlight
.max
;
938 if (panel
->backlight
.combination_mode
)
942 if (panel
->backlight
.combination_mode
)
943 ctl
|= BLM_LEGACY_MODE
;
944 if (IS_PINEVIEW(dev
) && panel
->backlight
.active_low_pwm
)
945 ctl
|= BLM_POLARITY_PNV
;
947 I915_WRITE(BLC_PWM_CTL
, ctl
);
948 POSTING_READ(BLC_PWM_CTL
);
950 /* XXX: combine this into above write? */
951 intel_panel_actually_set_backlight(connector
, panel
->backlight
.level
);
954 * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is
955 * 855gm only, but checking for gen2 is safe, as 855gm is the only gen2
956 * that has backlight.
959 I915_WRITE(BLC_HIST_CTL
, BLM_HISTOGRAM_ENABLE
);
962 static void i965_enable_backlight(struct intel_connector
*connector
)
964 struct drm_device
*dev
= connector
->base
.dev
;
965 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
966 struct intel_panel
*panel
= &connector
->panel
;
967 enum pipe pipe
= intel_get_pipe_from_connector(connector
);
970 ctl2
= I915_READ(BLC_PWM_CTL2
);
971 if (ctl2
& BLM_PWM_ENABLE
) {
972 DRM_DEBUG_KMS("backlight already enabled\n");
973 ctl2
&= ~BLM_PWM_ENABLE
;
974 I915_WRITE(BLC_PWM_CTL2
, ctl2
);
977 freq
= panel
->backlight
.max
;
978 if (panel
->backlight
.combination_mode
)
982 I915_WRITE(BLC_PWM_CTL
, ctl
);
984 ctl2
= BLM_PIPE(pipe
);
985 if (panel
->backlight
.combination_mode
)
986 ctl2
|= BLM_COMBINATION_MODE
;
987 if (panel
->backlight
.active_low_pwm
)
988 ctl2
|= BLM_POLARITY_I965
;
989 I915_WRITE(BLC_PWM_CTL2
, ctl2
);
990 POSTING_READ(BLC_PWM_CTL2
);
991 I915_WRITE(BLC_PWM_CTL2
, ctl2
| BLM_PWM_ENABLE
);
993 intel_panel_actually_set_backlight(connector
, panel
->backlight
.level
);
996 static void vlv_enable_backlight(struct intel_connector
*connector
)
998 struct drm_device
*dev
= connector
->base
.dev
;
999 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
1000 struct intel_panel
*panel
= &connector
->panel
;
1001 enum pipe pipe
= intel_get_pipe_from_connector(connector
);
1004 if (WARN_ON(pipe
!= PIPE_A
&& pipe
!= PIPE_B
))
1007 ctl2
= I915_READ(VLV_BLC_PWM_CTL2(pipe
));
1008 if (ctl2
& BLM_PWM_ENABLE
) {
1009 DRM_DEBUG_KMS("backlight already enabled\n");
1010 ctl2
&= ~BLM_PWM_ENABLE
;
1011 I915_WRITE(VLV_BLC_PWM_CTL2(pipe
), ctl2
);
1014 ctl
= panel
->backlight
.max
<< 16;
1015 I915_WRITE(VLV_BLC_PWM_CTL(pipe
), ctl
);
1017 /* XXX: combine this into above write? */
1018 intel_panel_actually_set_backlight(connector
, panel
->backlight
.level
);
1021 if (panel
->backlight
.active_low_pwm
)
1022 ctl2
|= BLM_POLARITY_I965
;
1023 I915_WRITE(VLV_BLC_PWM_CTL2(pipe
), ctl2
);
1024 POSTING_READ(VLV_BLC_PWM_CTL2(pipe
));
1025 I915_WRITE(VLV_BLC_PWM_CTL2(pipe
), ctl2
| BLM_PWM_ENABLE
);
1028 static void bxt_enable_backlight(struct intel_connector
*connector
)
1030 struct drm_device
*dev
= connector
->base
.dev
;
1031 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
1032 struct intel_panel
*panel
= &connector
->panel
;
1035 pwm_ctl
= I915_READ(BXT_BLC_PWM_CTL1
);
1036 if (pwm_ctl
& BXT_BLC_PWM_ENABLE
) {
1037 DRM_DEBUG_KMS("backlight already enabled\n");
1038 pwm_ctl
&= ~BXT_BLC_PWM_ENABLE
;
1039 I915_WRITE(BXT_BLC_PWM_CTL1
, pwm_ctl
);
1042 I915_WRITE(BXT_BLC_PWM_FREQ1
, panel
->backlight
.max
);
1044 intel_panel_actually_set_backlight(connector
, panel
->backlight
.level
);
1047 if (panel
->backlight
.active_low_pwm
)
1048 pwm_ctl
|= BXT_BLC_PWM_POLARITY
;
1050 I915_WRITE(BXT_BLC_PWM_CTL1
, pwm_ctl
);
1051 POSTING_READ(BXT_BLC_PWM_CTL1
);
1052 I915_WRITE(BXT_BLC_PWM_CTL1
, pwm_ctl
| BXT_BLC_PWM_ENABLE
);
1055 static void pwm_enable_backlight(struct intel_connector
*connector
)
1057 struct intel_panel
*panel
= &connector
->panel
;
1059 pwm_enable(panel
->backlight
.pwm
);
1060 intel_panel_actually_set_backlight(connector
, panel
->backlight
.level
);
1063 void intel_panel_enable_backlight(struct intel_connector
*connector
)
1065 struct drm_device
*dev
= connector
->base
.dev
;
1066 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
1067 struct intel_panel
*panel
= &connector
->panel
;
1068 enum pipe pipe
= intel_get_pipe_from_connector(connector
);
1070 if (!panel
->backlight
.present
)
1073 DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe
));
1075 mutex_lock(&dev_priv
->backlight_lock
);
1077 WARN_ON(panel
->backlight
.max
== 0);
1079 if (panel
->backlight
.level
<= panel
->backlight
.min
) {
1080 panel
->backlight
.level
= panel
->backlight
.max
;
1081 if (panel
->backlight
.device
)
1082 panel
->backlight
.device
->props
.brightness
=
1083 scale_hw_to_user(connector
,
1084 panel
->backlight
.level
,
1085 panel
->backlight
.device
->props
.max_brightness
);
1088 dev_priv
->display
.enable_backlight(connector
);
1089 panel
->backlight
.enabled
= true;
1090 if (panel
->backlight
.device
)
1091 panel
->backlight
.device
->props
.power
= FB_BLANK_UNBLANK
;
1093 mutex_unlock(&dev_priv
->backlight_lock
);
1096 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
1097 static int intel_backlight_device_update_status(struct backlight_device
*bd
)
1099 struct intel_connector
*connector
= bl_get_data(bd
);
1100 struct intel_panel
*panel
= &connector
->panel
;
1101 struct drm_device
*dev
= connector
->base
.dev
;
1103 drm_modeset_lock(&dev
->mode_config
.connection_mutex
, NULL
);
1104 DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
1105 bd
->props
.brightness
, bd
->props
.max_brightness
);
1106 intel_panel_set_backlight(connector
, bd
->props
.brightness
,
1107 bd
->props
.max_brightness
);
1110 * Allow flipping bl_power as a sub-state of enabled. Sadly the
1111 * backlight class device does not make it easy to to differentiate
1112 * between callbacks for brightness and bl_power, so our backlight_power
1113 * callback needs to take this into account.
1115 if (panel
->backlight
.enabled
) {
1116 if (panel
->backlight_power
) {
1117 bool enable
= bd
->props
.power
== FB_BLANK_UNBLANK
&&
1118 bd
->props
.brightness
!= 0;
1119 panel
->backlight_power(connector
, enable
);
1122 bd
->props
.power
= FB_BLANK_POWERDOWN
;
1125 drm_modeset_unlock(&dev
->mode_config
.connection_mutex
);
1129 static int intel_backlight_device_get_brightness(struct backlight_device
*bd
)
1131 struct intel_connector
*connector
= bl_get_data(bd
);
1132 struct drm_device
*dev
= connector
->base
.dev
;
1133 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
1137 intel_runtime_pm_get(dev_priv
);
1138 drm_modeset_lock(&dev
->mode_config
.connection_mutex
, NULL
);
1140 hw_level
= intel_panel_get_backlight(connector
);
1141 ret
= scale_hw_to_user(connector
, hw_level
, bd
->props
.max_brightness
);
1143 drm_modeset_unlock(&dev
->mode_config
.connection_mutex
);
1144 intel_runtime_pm_put(dev_priv
);
1149 static const struct backlight_ops intel_backlight_device_ops
= {
1150 .update_status
= intel_backlight_device_update_status
,
1151 .get_brightness
= intel_backlight_device_get_brightness
,
1154 static int intel_backlight_device_register(struct intel_connector
*connector
)
1156 struct intel_panel
*panel
= &connector
->panel
;
1157 struct backlight_properties props
;
1159 if (WARN_ON(panel
->backlight
.device
))
1162 if (!panel
->backlight
.present
)
1165 WARN_ON(panel
->backlight
.max
== 0);
1167 memset(&props
, 0, sizeof(props
));
1168 props
.type
= BACKLIGHT_RAW
;
1171 * Note: Everything should work even if the backlight device max
1172 * presented to the userspace is arbitrarily chosen.
1174 props
.max_brightness
= panel
->backlight
.max
;
1175 props
.brightness
= scale_hw_to_user(connector
,
1176 panel
->backlight
.level
,
1177 props
.max_brightness
);
1179 if (panel
->backlight
.enabled
)
1180 props
.power
= FB_BLANK_UNBLANK
;
1182 props
.power
= FB_BLANK_POWERDOWN
;
1185 * Note: using the same name independent of the connector prevents
1186 * registration of multiple backlight devices in the driver.
1188 panel
->backlight
.device
=
1189 backlight_device_register("intel_backlight",
1190 connector
->base
.kdev
,
1192 &intel_backlight_device_ops
, &props
);
1194 if (IS_ERR(panel
->backlight
.device
)) {
1195 DRM_ERROR("Failed to register backlight: %ld\n",
1196 PTR_ERR(panel
->backlight
.device
));
1197 panel
->backlight
.device
= NULL
;
1201 DRM_DEBUG_KMS("Connector %s backlight sysfs interface registered\n",
1202 connector
->base
.name
);
1207 static void intel_backlight_device_unregister(struct intel_connector
*connector
)
1209 struct intel_panel
*panel
= &connector
->panel
;
1211 if (panel
->backlight
.device
) {
1212 backlight_device_unregister(panel
->backlight
.device
);
1213 panel
->backlight
.device
= NULL
;
1216 #else /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1217 static int intel_backlight_device_register(struct intel_connector
*connector
)
1221 static void intel_backlight_device_unregister(struct intel_connector
*connector
)
1224 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1227 * SPT: This value represents the period of the PWM stream in clock periods
1228 * multiplied by 16 (default increment) or 128 (alternate increment selected in
1229 * SCHICKEN_1 bit 0). PWM clock is 24 MHz.
1231 static u32
spt_hz_to_pwm(struct intel_connector
*connector
, u32 pwm_freq_hz
)
1233 struct drm_device
*dev
= connector
->base
.dev
;
1234 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
1237 if (I915_READ(SOUTH_CHICKEN1
) & SPT_PWM_GRANULARITY
)
1244 return clock
/ (pwm_freq_hz
* mul
);
1248 * LPT: This value represents the period of the PWM stream in clock periods
1249 * multiplied by 128 (default increment) or 16 (alternate increment, selected in
1250 * LPT SOUTH_CHICKEN2 register bit 5).
1252 static u32
lpt_hz_to_pwm(struct intel_connector
*connector
, u32 pwm_freq_hz
)
1254 struct drm_device
*dev
= connector
->base
.dev
;
1255 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
1258 if (I915_READ(SOUTH_CHICKEN2
) & LPT_PWM_GRANULARITY
)
1263 if (dev_priv
->pch_id
== INTEL_PCH_LPT_DEVICE_ID_TYPE
)
1264 clock
= MHz(135); /* LPT:H */
1266 clock
= MHz(24); /* LPT:LP */
1268 return clock
/ (pwm_freq_hz
* mul
);
1272 * ILK/SNB/IVB: This value represents the period of the PWM stream in PCH
1273 * display raw clocks multiplied by 128.
1275 static u32
pch_hz_to_pwm(struct intel_connector
*connector
, u32 pwm_freq_hz
)
1277 struct drm_device
*dev
= connector
->base
.dev
;
1278 int clock
= MHz(intel_pch_rawclk(dev
));
1280 return clock
/ (pwm_freq_hz
* 128);
1284 * Gen2: This field determines the number of time base events (display core
1285 * clock frequency/32) in total for a complete cycle of modulated backlight
1288 * Gen3: A time base event equals the display core clock ([DevPNV] HRAW clock)
1291 static u32
i9xx_hz_to_pwm(struct intel_connector
*connector
, u32 pwm_freq_hz
)
1293 struct drm_device
*dev
= connector
->base
.dev
;
1294 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
1297 if (IS_PINEVIEW(dev
))
1298 clock
= intel_hrawclk(dev
);
1300 clock
= 1000 * dev_priv
->display
.get_display_clock_speed(dev
);
1302 return clock
/ (pwm_freq_hz
* 32);
1306 * Gen4: This value represents the period of the PWM stream in display core
1307 * clocks multiplied by 128.
1309 static u32
i965_hz_to_pwm(struct intel_connector
*connector
, u32 pwm_freq_hz
)
1311 struct drm_device
*dev
= connector
->base
.dev
;
1312 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
1313 int clock
= 1000 * dev_priv
->display
.get_display_clock_speed(dev
);
1315 return clock
/ (pwm_freq_hz
* 128);
1319 * VLV: This value represents the period of the PWM stream in display core
1320 * clocks ([DevCTG] 200MHz HRAW clocks) multiplied by 128 or 25MHz S0IX clocks
1321 * multiplied by 16. CHV uses a 19.2MHz S0IX clock.
1323 static u32
vlv_hz_to_pwm(struct intel_connector
*connector
, u32 pwm_freq_hz
)
1325 struct drm_device
*dev
= connector
->base
.dev
;
1326 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
1329 if ((I915_READ(CBR1_VLV
) & CBR_PWM_CLOCK_MUX_SELECT
) == 0) {
1330 if (IS_CHERRYVIEW(dev
))
1331 return KHz(19200) / (pwm_freq_hz
* 16);
1333 return MHz(25) / (pwm_freq_hz
* 16);
1335 clock
= intel_hrawclk(dev
);
1336 return MHz(clock
) / (pwm_freq_hz
* 128);
1340 static u32
get_backlight_max_vbt(struct intel_connector
*connector
)
1342 struct drm_device
*dev
= connector
->base
.dev
;
1343 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
1344 u16 pwm_freq_hz
= dev_priv
->vbt
.backlight
.pwm_freq_hz
;
1348 DRM_DEBUG_KMS("backlight frequency not specified in VBT\n");
1352 if (!dev_priv
->display
.backlight_hz_to_pwm
) {
1353 DRM_DEBUG_KMS("backlight frequency setting from VBT currently not supported on this platform\n");
1357 pwm
= dev_priv
->display
.backlight_hz_to_pwm(connector
, pwm_freq_hz
);
1359 DRM_DEBUG_KMS("backlight frequency conversion failed\n");
1363 DRM_DEBUG_KMS("backlight frequency %u Hz from VBT\n", pwm_freq_hz
);
1369 * Note: The setup hooks can't assume pipe is set!
1371 static u32
get_backlight_min_vbt(struct intel_connector
*connector
)
1373 struct drm_device
*dev
= connector
->base
.dev
;
1374 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
1375 struct intel_panel
*panel
= &connector
->panel
;
1378 WARN_ON(panel
->backlight
.max
== 0);
1381 * XXX: If the vbt value is 255, it makes min equal to max, which leads
1382 * to problems. There are such machines out there. Either our
1383 * interpretation is wrong or the vbt has bogus data. Or both. Safeguard
1384 * against this by letting the minimum be at most (arbitrarily chosen)
1387 min
= clamp_t(int, dev_priv
->vbt
.backlight
.min_brightness
, 0, 64);
1388 if (min
!= dev_priv
->vbt
.backlight
.min_brightness
) {
1389 DRM_DEBUG_KMS("clamping VBT min backlight %d/255 to %d/255\n",
1390 dev_priv
->vbt
.backlight
.min_brightness
, min
);
1393 /* vbt value is a coefficient in range [0..255] */
1394 return scale(min
, 0, 255, 0, panel
->backlight
.max
);
1397 static int lpt_setup_backlight(struct intel_connector
*connector
, enum pipe unused
)
1399 struct drm_device
*dev
= connector
->base
.dev
;
1400 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
1401 struct intel_panel
*panel
= &connector
->panel
;
1402 u32 pch_ctl1
, pch_ctl2
, val
;
1404 pch_ctl1
= I915_READ(BLC_PWM_PCH_CTL1
);
1405 panel
->backlight
.active_low_pwm
= pch_ctl1
& BLM_PCH_POLARITY
;
1407 pch_ctl2
= I915_READ(BLC_PWM_PCH_CTL2
);
1408 panel
->backlight
.max
= pch_ctl2
>> 16;
1410 if (!panel
->backlight
.max
)
1411 panel
->backlight
.max
= get_backlight_max_vbt(connector
);
1413 if (!panel
->backlight
.max
)
1416 panel
->backlight
.min
= get_backlight_min_vbt(connector
);
1418 val
= lpt_get_backlight(connector
);
1419 panel
->backlight
.level
= intel_panel_compute_brightness(connector
, val
);
1421 panel
->backlight
.enabled
= (pch_ctl1
& BLM_PCH_PWM_ENABLE
) &&
1422 panel
->backlight
.level
!= 0;
1427 static int pch_setup_backlight(struct intel_connector
*connector
, enum pipe unused
)
1429 struct drm_device
*dev
= connector
->base
.dev
;
1430 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
1431 struct intel_panel
*panel
= &connector
->panel
;
1432 u32 cpu_ctl2
, pch_ctl1
, pch_ctl2
, val
;
1434 pch_ctl1
= I915_READ(BLC_PWM_PCH_CTL1
);
1435 panel
->backlight
.active_low_pwm
= pch_ctl1
& BLM_PCH_POLARITY
;
1437 pch_ctl2
= I915_READ(BLC_PWM_PCH_CTL2
);
1438 panel
->backlight
.max
= pch_ctl2
>> 16;
1440 if (!panel
->backlight
.max
)
1441 panel
->backlight
.max
= get_backlight_max_vbt(connector
);
1443 if (!panel
->backlight
.max
)
1446 panel
->backlight
.min
= get_backlight_min_vbt(connector
);
1448 val
= pch_get_backlight(connector
);
1449 panel
->backlight
.level
= intel_panel_compute_brightness(connector
, val
);
1451 cpu_ctl2
= I915_READ(BLC_PWM_CPU_CTL2
);
1452 panel
->backlight
.enabled
= (cpu_ctl2
& BLM_PWM_ENABLE
) &&
1453 (pch_ctl1
& BLM_PCH_PWM_ENABLE
) && panel
->backlight
.level
!= 0;
1458 static int i9xx_setup_backlight(struct intel_connector
*connector
, enum pipe unused
)
1460 struct drm_device
*dev
= connector
->base
.dev
;
1461 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
1462 struct intel_panel
*panel
= &connector
->panel
;
1465 ctl
= I915_READ(BLC_PWM_CTL
);
1467 if (IS_GEN2(dev
) || IS_I915GM(dev
) || IS_I945GM(dev
))
1468 panel
->backlight
.combination_mode
= ctl
& BLM_LEGACY_MODE
;
1470 if (IS_PINEVIEW(dev
))
1471 panel
->backlight
.active_low_pwm
= ctl
& BLM_POLARITY_PNV
;
1473 panel
->backlight
.max
= ctl
>> 17;
1475 if (!panel
->backlight
.max
) {
1476 panel
->backlight
.max
= get_backlight_max_vbt(connector
);
1477 panel
->backlight
.max
>>= 1;
1480 if (!panel
->backlight
.max
)
1483 if (panel
->backlight
.combination_mode
)
1484 panel
->backlight
.max
*= 0xff;
1486 panel
->backlight
.min
= get_backlight_min_vbt(connector
);
1488 val
= i9xx_get_backlight(connector
);
1489 panel
->backlight
.level
= intel_panel_compute_brightness(connector
, val
);
1491 panel
->backlight
.enabled
= panel
->backlight
.level
!= 0;
1496 static int i965_setup_backlight(struct intel_connector
*connector
, enum pipe unused
)
1498 struct drm_device
*dev
= connector
->base
.dev
;
1499 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
1500 struct intel_panel
*panel
= &connector
->panel
;
1503 ctl2
= I915_READ(BLC_PWM_CTL2
);
1504 panel
->backlight
.combination_mode
= ctl2
& BLM_COMBINATION_MODE
;
1505 panel
->backlight
.active_low_pwm
= ctl2
& BLM_POLARITY_I965
;
1507 ctl
= I915_READ(BLC_PWM_CTL
);
1508 panel
->backlight
.max
= ctl
>> 16;
1510 if (!panel
->backlight
.max
)
1511 panel
->backlight
.max
= get_backlight_max_vbt(connector
);
1513 if (!panel
->backlight
.max
)
1516 if (panel
->backlight
.combination_mode
)
1517 panel
->backlight
.max
*= 0xff;
1519 panel
->backlight
.min
= get_backlight_min_vbt(connector
);
1521 val
= i9xx_get_backlight(connector
);
1522 panel
->backlight
.level
= intel_panel_compute_brightness(connector
, val
);
1524 panel
->backlight
.enabled
= (ctl2
& BLM_PWM_ENABLE
) &&
1525 panel
->backlight
.level
!= 0;
1530 static int vlv_setup_backlight(struct intel_connector
*connector
, enum pipe pipe
)
1532 struct drm_device
*dev
= connector
->base
.dev
;
1533 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
1534 struct intel_panel
*panel
= &connector
->panel
;
1537 if (WARN_ON(pipe
!= PIPE_A
&& pipe
!= PIPE_B
))
1540 ctl2
= I915_READ(VLV_BLC_PWM_CTL2(pipe
));
1541 panel
->backlight
.active_low_pwm
= ctl2
& BLM_POLARITY_I965
;
1543 ctl
= I915_READ(VLV_BLC_PWM_CTL(pipe
));
1544 panel
->backlight
.max
= ctl
>> 16;
1546 if (!panel
->backlight
.max
)
1547 panel
->backlight
.max
= get_backlight_max_vbt(connector
);
1549 if (!panel
->backlight
.max
)
1552 panel
->backlight
.min
= get_backlight_min_vbt(connector
);
1554 val
= _vlv_get_backlight(dev
, pipe
);
1555 panel
->backlight
.level
= intel_panel_compute_brightness(connector
, val
);
1557 panel
->backlight
.enabled
= (ctl2
& BLM_PWM_ENABLE
) &&
1558 panel
->backlight
.level
!= 0;
1564 bxt_setup_backlight(struct intel_connector
*connector
, enum pipe unused
)
1566 struct drm_device
*dev
= connector
->base
.dev
;
1567 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
1568 struct intel_panel
*panel
= &connector
->panel
;
1571 pwm_ctl
= I915_READ(BXT_BLC_PWM_CTL1
);
1572 panel
->backlight
.active_low_pwm
= pwm_ctl
& BXT_BLC_PWM_POLARITY
;
1574 panel
->backlight
.max
= I915_READ(BXT_BLC_PWM_FREQ1
);
1576 if (!panel
->backlight
.max
)
1577 panel
->backlight
.max
= get_backlight_max_vbt(connector
);
1579 if (!panel
->backlight
.max
)
1582 val
= bxt_get_backlight(connector
);
1583 panel
->backlight
.level
= intel_panel_compute_brightness(connector
, val
);
1585 panel
->backlight
.enabled
= (pwm_ctl
& BXT_BLC_PWM_ENABLE
) &&
1586 panel
->backlight
.level
!= 0;
1591 static int pwm_setup_backlight(struct intel_connector
*connector
,
1594 struct drm_device
*dev
= connector
->base
.dev
;
1595 struct intel_panel
*panel
= &connector
->panel
;
1598 /* Get the PWM chip for backlight control */
1599 panel
->backlight
.pwm
= pwm_get(dev
->dev
, "pwm_backlight");
1600 if (IS_ERR(panel
->backlight
.pwm
)) {
1601 DRM_ERROR("Failed to own the pwm chip\n");
1602 panel
->backlight
.pwm
= NULL
;
1606 retval
= pwm_config(panel
->backlight
.pwm
, CRC_PMIC_PWM_PERIOD_NS
,
1607 CRC_PMIC_PWM_PERIOD_NS
);
1609 DRM_ERROR("Failed to configure the pwm chip\n");
1610 pwm_put(panel
->backlight
.pwm
);
1611 panel
->backlight
.pwm
= NULL
;
1615 panel
->backlight
.min
= 0; /* 0% */
1616 panel
->backlight
.max
= 100; /* 100% */
1617 panel
->backlight
.level
= DIV_ROUND_UP(
1618 pwm_get_duty_cycle(panel
->backlight
.pwm
) * 100,
1619 CRC_PMIC_PWM_PERIOD_NS
);
1620 panel
->backlight
.enabled
= panel
->backlight
.level
!= 0;
1625 int intel_panel_setup_backlight(struct drm_connector
*connector
, enum pipe pipe
)
1627 struct drm_device
*dev
= connector
->dev
;
1628 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
1629 struct intel_connector
*intel_connector
= to_intel_connector(connector
);
1630 struct intel_panel
*panel
= &intel_connector
->panel
;
1633 if (!dev_priv
->vbt
.backlight
.present
) {
1634 if (dev_priv
->quirks
& QUIRK_BACKLIGHT_PRESENT
) {
1635 DRM_DEBUG_KMS("no backlight present per VBT, but present per quirk\n");
1637 DRM_DEBUG_KMS("no backlight present per VBT\n");
1642 /* set level and max in panel struct */
1643 mutex_lock(&dev_priv
->backlight_lock
);
1644 ret
= dev_priv
->display
.setup_backlight(intel_connector
, pipe
);
1645 mutex_unlock(&dev_priv
->backlight_lock
);
1648 DRM_DEBUG_KMS("failed to setup backlight for connector %s\n",
1653 panel
->backlight
.present
= true;
1655 DRM_DEBUG_KMS("Connector %s backlight initialized, %s, brightness %u/%u\n",
1657 panel
->backlight
.enabled
? "enabled" : "disabled",
1658 panel
->backlight
.level
, panel
->backlight
.max
);
1663 void intel_panel_destroy_backlight(struct drm_connector
*connector
)
1665 struct intel_connector
*intel_connector
= to_intel_connector(connector
);
1666 struct intel_panel
*panel
= &intel_connector
->panel
;
1668 /* dispose of the pwm */
1669 if (panel
->backlight
.pwm
)
1670 pwm_put(panel
->backlight
.pwm
);
1672 panel
->backlight
.present
= false;
1675 /* Set up chip specific backlight functions */
1676 void intel_panel_init_backlight_funcs(struct drm_device
*dev
)
1678 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
1680 if (IS_BROXTON(dev
)) {
1681 dev_priv
->display
.setup_backlight
= bxt_setup_backlight
;
1682 dev_priv
->display
.enable_backlight
= bxt_enable_backlight
;
1683 dev_priv
->display
.disable_backlight
= bxt_disable_backlight
;
1684 dev_priv
->display
.set_backlight
= bxt_set_backlight
;
1685 dev_priv
->display
.get_backlight
= bxt_get_backlight
;
1686 } else if (HAS_PCH_LPT(dev
) || HAS_PCH_SPT(dev
)) {
1687 dev_priv
->display
.setup_backlight
= lpt_setup_backlight
;
1688 dev_priv
->display
.enable_backlight
= lpt_enable_backlight
;
1689 dev_priv
->display
.disable_backlight
= lpt_disable_backlight
;
1690 dev_priv
->display
.set_backlight
= lpt_set_backlight
;
1691 dev_priv
->display
.get_backlight
= lpt_get_backlight
;
1692 if (HAS_PCH_LPT(dev
))
1693 dev_priv
->display
.backlight_hz_to_pwm
= lpt_hz_to_pwm
;
1695 dev_priv
->display
.backlight_hz_to_pwm
= spt_hz_to_pwm
;
1696 } else if (HAS_PCH_SPLIT(dev
)) {
1697 dev_priv
->display
.setup_backlight
= pch_setup_backlight
;
1698 dev_priv
->display
.enable_backlight
= pch_enable_backlight
;
1699 dev_priv
->display
.disable_backlight
= pch_disable_backlight
;
1700 dev_priv
->display
.set_backlight
= pch_set_backlight
;
1701 dev_priv
->display
.get_backlight
= pch_get_backlight
;
1702 dev_priv
->display
.backlight_hz_to_pwm
= pch_hz_to_pwm
;
1703 } else if (IS_VALLEYVIEW(dev
)) {
1704 if (dev_priv
->vbt
.has_mipi
) {
1705 dev_priv
->display
.setup_backlight
= pwm_setup_backlight
;
1706 dev_priv
->display
.enable_backlight
= pwm_enable_backlight
;
1707 dev_priv
->display
.disable_backlight
= pwm_disable_backlight
;
1708 dev_priv
->display
.set_backlight
= pwm_set_backlight
;
1709 dev_priv
->display
.get_backlight
= pwm_get_backlight
;
1711 dev_priv
->display
.setup_backlight
= vlv_setup_backlight
;
1712 dev_priv
->display
.enable_backlight
= vlv_enable_backlight
;
1713 dev_priv
->display
.disable_backlight
= vlv_disable_backlight
;
1714 dev_priv
->display
.set_backlight
= vlv_set_backlight
;
1715 dev_priv
->display
.get_backlight
= vlv_get_backlight
;
1716 dev_priv
->display
.backlight_hz_to_pwm
= vlv_hz_to_pwm
;
1718 } else if (IS_GEN4(dev
)) {
1719 dev_priv
->display
.setup_backlight
= i965_setup_backlight
;
1720 dev_priv
->display
.enable_backlight
= i965_enable_backlight
;
1721 dev_priv
->display
.disable_backlight
= i965_disable_backlight
;
1722 dev_priv
->display
.set_backlight
= i9xx_set_backlight
;
1723 dev_priv
->display
.get_backlight
= i9xx_get_backlight
;
1724 dev_priv
->display
.backlight_hz_to_pwm
= i965_hz_to_pwm
;
1726 dev_priv
->display
.setup_backlight
= i9xx_setup_backlight
;
1727 dev_priv
->display
.enable_backlight
= i9xx_enable_backlight
;
1728 dev_priv
->display
.disable_backlight
= i9xx_disable_backlight
;
1729 dev_priv
->display
.set_backlight
= i9xx_set_backlight
;
1730 dev_priv
->display
.get_backlight
= i9xx_get_backlight
;
1731 dev_priv
->display
.backlight_hz_to_pwm
= i9xx_hz_to_pwm
;
1735 int intel_panel_init(struct intel_panel
*panel
,
1736 struct drm_display_mode
*fixed_mode
,
1737 struct drm_display_mode
*downclock_mode
)
1739 panel
->fixed_mode
= fixed_mode
;
1740 panel
->downclock_mode
= downclock_mode
;
1745 void intel_panel_fini(struct intel_panel
*panel
)
1747 struct intel_connector
*intel_connector
=
1748 container_of(panel
, struct intel_connector
, panel
);
1750 if (panel
->fixed_mode
)
1751 drm_mode_destroy(intel_connector
->base
.dev
, panel
->fixed_mode
);
1753 if (panel
->downclock_mode
)
1754 drm_mode_destroy(intel_connector
->base
.dev
,
1755 panel
->downclock_mode
);
1758 void intel_backlight_register(struct drm_device
*dev
)
1760 struct intel_connector
*connector
;
1762 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, base
.head
)
1763 intel_backlight_device_register(connector
);
1766 void intel_backlight_unregister(struct drm_device
*dev
)
1768 struct intel_connector
*connector
;
1770 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, base
.head
)
1771 intel_backlight_device_unregister(connector
);