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drm: move drm_mode related functions into drm_modes.c
[deliverable/linux.git] / drivers / gpu / drm / drm_modes.c
1 /*
2 * Copyright © 1997-2003 by The XFree86 Project, Inc.
3 * Copyright © 2007 Dave Airlie
4 * Copyright © 2007-2008 Intel Corporation
5 * Jesse Barnes <jesse.barnes@intel.com>
6 * Copyright 2005-2006 Luc Verhaegen
7 * Copyright (c) 2001, Andy Ritger aritger@nvidia.com
8 *
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 * and/or sell copies of the Software, and to permit persons to whom the
14 * Software is furnished to do so, subject to the following conditions:
15 *
16 * The above copyright notice and this permission notice shall be included in
17 * all copies or substantial portions of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
23 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
24 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
25 * OTHER DEALINGS IN THE SOFTWARE.
26 *
27 * Except as contained in this notice, the name of the copyright holder(s)
28 * and author(s) shall not be used in advertising or otherwise to promote
29 * the sale, use or other dealings in this Software without prior written
30 * authorization from the copyright holder(s) and author(s).
31 */
32
33 #include <linux/list.h>
34 #include <linux/list_sort.h>
35 #include <linux/export.h>
36 #include <drm/drmP.h>
37 #include <drm/drm_crtc.h>
38 #include <video/of_videomode.h>
39 #include <video/videomode.h>
40
41 #include "drm_crtc_internal.h"
42
43 /**
44 * drm_mode_debug_printmodeline - print a mode to dmesg
45 * @mode: mode to print
46 *
47 * Describe @mode using DRM_DEBUG.
48 */
49 void drm_mode_debug_printmodeline(const struct drm_display_mode *mode)
50 {
51 DRM_DEBUG_KMS("Modeline %d:\"%s\" %d %d %d %d %d %d %d %d %d %d "
52 "0x%x 0x%x\n",
53 mode->base.id, mode->name, mode->vrefresh, mode->clock,
54 mode->hdisplay, mode->hsync_start,
55 mode->hsync_end, mode->htotal,
56 mode->vdisplay, mode->vsync_start,
57 mode->vsync_end, mode->vtotal, mode->type, mode->flags);
58 }
59 EXPORT_SYMBOL(drm_mode_debug_printmodeline);
60
61 /**
62 * drm_mode_create - create a new display mode
63 * @dev: DRM device
64 *
65 * Create a new drm_display_mode, give it an ID, and return it.
66 *
67 * RETURNS:
68 * Pointer to new mode on success, NULL on error.
69 */
70 struct drm_display_mode *drm_mode_create(struct drm_device *dev)
71 {
72 struct drm_display_mode *nmode;
73
74 nmode = kzalloc(sizeof(struct drm_display_mode), GFP_KERNEL);
75 if (!nmode)
76 return NULL;
77
78 if (drm_mode_object_get(dev, &nmode->base, DRM_MODE_OBJECT_MODE)) {
79 kfree(nmode);
80 return NULL;
81 }
82
83 return nmode;
84 }
85 EXPORT_SYMBOL(drm_mode_create);
86
87 /**
88 * drm_mode_destroy - remove a mode
89 * @dev: DRM device
90 * @mode: mode to remove
91 *
92 * Free @mode's unique identifier, then free it.
93 */
94 void drm_mode_destroy(struct drm_device *dev, struct drm_display_mode *mode)
95 {
96 if (!mode)
97 return;
98
99 drm_mode_object_put(dev, &mode->base);
100
101 kfree(mode);
102 }
103 EXPORT_SYMBOL(drm_mode_destroy);
104
105 /**
106 * drm_mode_probed_add - add a mode to a connector's probed mode list
107 * @connector: connector the new mode
108 * @mode: mode data
109 *
110 * Add @mode to @connector's mode list for later use.
111 */
112 void drm_mode_probed_add(struct drm_connector *connector,
113 struct drm_display_mode *mode)
114 {
115 WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
116
117 list_add_tail(&mode->head, &connector->probed_modes);
118 }
119 EXPORT_SYMBOL(drm_mode_probed_add);
120
121 /**
122 * drm_cvt_mode -create a modeline based on CVT algorithm
123 * @dev: DRM device
124 * @hdisplay: hdisplay size
125 * @vdisplay: vdisplay size
126 * @vrefresh : vrefresh rate
127 * @reduced : Whether the GTF calculation is simplified
128 * @interlaced:Whether the interlace is supported
129 * @margins: whether to add margins or not
130 *
131 * return the modeline based on CVT algorithm
132 *
133 * This function is called to generate the modeline based on CVT algorithm
134 * according to the hdisplay, vdisplay, vrefresh.
135 * It is based from the VESA(TM) Coordinated Video Timing Generator by
136 * Graham Loveridge April 9, 2003 available at
137 * http://www.elo.utfsm.cl/~elo212/docs/CVTd6r1.xls
138 *
139 * And it is copied from xf86CVTmode in xserver/hw/xfree86/modes/xf86cvt.c.
140 * What I have done is to translate it by using integer calculation.
141 */
142 struct drm_display_mode *drm_cvt_mode(struct drm_device *dev, int hdisplay,
143 int vdisplay, int vrefresh,
144 bool reduced, bool interlaced, bool margins)
145 {
146 #define HV_FACTOR 1000
147 /* 1) top/bottom margin size (% of height) - default: 1.8, */
148 #define CVT_MARGIN_PERCENTAGE 18
149 /* 2) character cell horizontal granularity (pixels) - default 8 */
150 #define CVT_H_GRANULARITY 8
151 /* 3) Minimum vertical porch (lines) - default 3 */
152 #define CVT_MIN_V_PORCH 3
153 /* 4) Minimum number of vertical back porch lines - default 6 */
154 #define CVT_MIN_V_BPORCH 6
155 /* Pixel Clock step (kHz) */
156 #define CVT_CLOCK_STEP 250
157 struct drm_display_mode *drm_mode;
158 unsigned int vfieldrate, hperiod;
159 int hdisplay_rnd, hmargin, vdisplay_rnd, vmargin, vsync;
160 int interlace;
161
162 /* allocate the drm_display_mode structure. If failure, we will
163 * return directly
164 */
165 drm_mode = drm_mode_create(dev);
166 if (!drm_mode)
167 return NULL;
168
169 /* the CVT default refresh rate is 60Hz */
170 if (!vrefresh)
171 vrefresh = 60;
172
173 /* the required field fresh rate */
174 if (interlaced)
175 vfieldrate = vrefresh * 2;
176 else
177 vfieldrate = vrefresh;
178
179 /* horizontal pixels */
180 hdisplay_rnd = hdisplay - (hdisplay % CVT_H_GRANULARITY);
181
182 /* determine the left&right borders */
183 hmargin = 0;
184 if (margins) {
185 hmargin = hdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
186 hmargin -= hmargin % CVT_H_GRANULARITY;
187 }
188 /* find the total active pixels */
189 drm_mode->hdisplay = hdisplay_rnd + 2 * hmargin;
190
191 /* find the number of lines per field */
192 if (interlaced)
193 vdisplay_rnd = vdisplay / 2;
194 else
195 vdisplay_rnd = vdisplay;
196
197 /* find the top & bottom borders */
198 vmargin = 0;
199 if (margins)
200 vmargin = vdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
201
202 drm_mode->vdisplay = vdisplay + 2 * vmargin;
203
204 /* Interlaced */
205 if (interlaced)
206 interlace = 1;
207 else
208 interlace = 0;
209
210 /* Determine VSync Width from aspect ratio */
211 if (!(vdisplay % 3) && ((vdisplay * 4 / 3) == hdisplay))
212 vsync = 4;
213 else if (!(vdisplay % 9) && ((vdisplay * 16 / 9) == hdisplay))
214 vsync = 5;
215 else if (!(vdisplay % 10) && ((vdisplay * 16 / 10) == hdisplay))
216 vsync = 6;
217 else if (!(vdisplay % 4) && ((vdisplay * 5 / 4) == hdisplay))
218 vsync = 7;
219 else if (!(vdisplay % 9) && ((vdisplay * 15 / 9) == hdisplay))
220 vsync = 7;
221 else /* custom */
222 vsync = 10;
223
224 if (!reduced) {
225 /* simplify the GTF calculation */
226 /* 4) Minimum time of vertical sync + back porch interval (µs)
227 * default 550.0
228 */
229 int tmp1, tmp2;
230 #define CVT_MIN_VSYNC_BP 550
231 /* 3) Nominal HSync width (% of line period) - default 8 */
232 #define CVT_HSYNC_PERCENTAGE 8
233 unsigned int hblank_percentage;
234 int vsyncandback_porch, vback_porch, hblank;
235
236 /* estimated the horizontal period */
237 tmp1 = HV_FACTOR * 1000000 -
238 CVT_MIN_VSYNC_BP * HV_FACTOR * vfieldrate;
239 tmp2 = (vdisplay_rnd + 2 * vmargin + CVT_MIN_V_PORCH) * 2 +
240 interlace;
241 hperiod = tmp1 * 2 / (tmp2 * vfieldrate);
242
243 tmp1 = CVT_MIN_VSYNC_BP * HV_FACTOR / hperiod + 1;
244 /* 9. Find number of lines in sync + backporch */
245 if (tmp1 < (vsync + CVT_MIN_V_PORCH))
246 vsyncandback_porch = vsync + CVT_MIN_V_PORCH;
247 else
248 vsyncandback_porch = tmp1;
249 /* 10. Find number of lines in back porch */
250 vback_porch = vsyncandback_porch - vsync;
251 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin +
252 vsyncandback_porch + CVT_MIN_V_PORCH;
253 /* 5) Definition of Horizontal blanking time limitation */
254 /* Gradient (%/kHz) - default 600 */
255 #define CVT_M_FACTOR 600
256 /* Offset (%) - default 40 */
257 #define CVT_C_FACTOR 40
258 /* Blanking time scaling factor - default 128 */
259 #define CVT_K_FACTOR 128
260 /* Scaling factor weighting - default 20 */
261 #define CVT_J_FACTOR 20
262 #define CVT_M_PRIME (CVT_M_FACTOR * CVT_K_FACTOR / 256)
263 #define CVT_C_PRIME ((CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + \
264 CVT_J_FACTOR)
265 /* 12. Find ideal blanking duty cycle from formula */
266 hblank_percentage = CVT_C_PRIME * HV_FACTOR - CVT_M_PRIME *
267 hperiod / 1000;
268 /* 13. Blanking time */
269 if (hblank_percentage < 20 * HV_FACTOR)
270 hblank_percentage = 20 * HV_FACTOR;
271 hblank = drm_mode->hdisplay * hblank_percentage /
272 (100 * HV_FACTOR - hblank_percentage);
273 hblank -= hblank % (2 * CVT_H_GRANULARITY);
274 /* 14. find the total pixes per line */
275 drm_mode->htotal = drm_mode->hdisplay + hblank;
276 drm_mode->hsync_end = drm_mode->hdisplay + hblank / 2;
277 drm_mode->hsync_start = drm_mode->hsync_end -
278 (drm_mode->htotal * CVT_HSYNC_PERCENTAGE) / 100;
279 drm_mode->hsync_start += CVT_H_GRANULARITY -
280 drm_mode->hsync_start % CVT_H_GRANULARITY;
281 /* fill the Vsync values */
282 drm_mode->vsync_start = drm_mode->vdisplay + CVT_MIN_V_PORCH;
283 drm_mode->vsync_end = drm_mode->vsync_start + vsync;
284 } else {
285 /* Reduced blanking */
286 /* Minimum vertical blanking interval time (µs)- default 460 */
287 #define CVT_RB_MIN_VBLANK 460
288 /* Fixed number of clocks for horizontal sync */
289 #define CVT_RB_H_SYNC 32
290 /* Fixed number of clocks for horizontal blanking */
291 #define CVT_RB_H_BLANK 160
292 /* Fixed number of lines for vertical front porch - default 3*/
293 #define CVT_RB_VFPORCH 3
294 int vbilines;
295 int tmp1, tmp2;
296 /* 8. Estimate Horizontal period. */
297 tmp1 = HV_FACTOR * 1000000 -
298 CVT_RB_MIN_VBLANK * HV_FACTOR * vfieldrate;
299 tmp2 = vdisplay_rnd + 2 * vmargin;
300 hperiod = tmp1 / (tmp2 * vfieldrate);
301 /* 9. Find number of lines in vertical blanking */
302 vbilines = CVT_RB_MIN_VBLANK * HV_FACTOR / hperiod + 1;
303 /* 10. Check if vertical blanking is sufficient */
304 if (vbilines < (CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH))
305 vbilines = CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH;
306 /* 11. Find total number of lines in vertical field */
307 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin + vbilines;
308 /* 12. Find total number of pixels in a line */
309 drm_mode->htotal = drm_mode->hdisplay + CVT_RB_H_BLANK;
310 /* Fill in HSync values */
311 drm_mode->hsync_end = drm_mode->hdisplay + CVT_RB_H_BLANK / 2;
312 drm_mode->hsync_start = drm_mode->hsync_end - CVT_RB_H_SYNC;
313 /* Fill in VSync values */
314 drm_mode->vsync_start = drm_mode->vdisplay + CVT_RB_VFPORCH;
315 drm_mode->vsync_end = drm_mode->vsync_start + vsync;
316 }
317 /* 15/13. Find pixel clock frequency (kHz for xf86) */
318 drm_mode->clock = drm_mode->htotal * HV_FACTOR * 1000 / hperiod;
319 drm_mode->clock -= drm_mode->clock % CVT_CLOCK_STEP;
320 /* 18/16. Find actual vertical frame frequency */
321 /* ignore - just set the mode flag for interlaced */
322 if (interlaced) {
323 drm_mode->vtotal *= 2;
324 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
325 }
326 /* Fill the mode line name */
327 drm_mode_set_name(drm_mode);
328 if (reduced)
329 drm_mode->flags |= (DRM_MODE_FLAG_PHSYNC |
330 DRM_MODE_FLAG_NVSYNC);
331 else
332 drm_mode->flags |= (DRM_MODE_FLAG_PVSYNC |
333 DRM_MODE_FLAG_NHSYNC);
334
335 return drm_mode;
336 }
337 EXPORT_SYMBOL(drm_cvt_mode);
338
339 /**
340 * drm_gtf_mode_complex - create the modeline based on full GTF algorithm
341 *
342 * @dev :drm device
343 * @hdisplay :hdisplay size
344 * @vdisplay :vdisplay size
345 * @vrefresh :vrefresh rate.
346 * @interlaced :whether the interlace is supported
347 * @margins :desired margin size
348 * @GTF_M: extended GTF formula parameters
349 * @GTF_2C: extended GTF formula parameters
350 * @GTF_K: extended GTF formula parameters
351 * @GTF_2J: extended GTF formula parameters
352 *
353 * return the modeline based on full GTF algorithm.
354 *
355 * GTF feature blocks specify C and J in multiples of 0.5, so we pass them
356 * in here multiplied by two. For a C of 40, pass in 80.
357 */
358 struct drm_display_mode *
359 drm_gtf_mode_complex(struct drm_device *dev, int hdisplay, int vdisplay,
360 int vrefresh, bool interlaced, int margins,
361 int GTF_M, int GTF_2C, int GTF_K, int GTF_2J)
362 { /* 1) top/bottom margin size (% of height) - default: 1.8, */
363 #define GTF_MARGIN_PERCENTAGE 18
364 /* 2) character cell horizontal granularity (pixels) - default 8 */
365 #define GTF_CELL_GRAN 8
366 /* 3) Minimum vertical porch (lines) - default 3 */
367 #define GTF_MIN_V_PORCH 1
368 /* width of vsync in lines */
369 #define V_SYNC_RQD 3
370 /* width of hsync as % of total line */
371 #define H_SYNC_PERCENT 8
372 /* min time of vsync + back porch (microsec) */
373 #define MIN_VSYNC_PLUS_BP 550
374 /* C' and M' are part of the Blanking Duty Cycle computation */
375 #define GTF_C_PRIME ((((GTF_2C - GTF_2J) * GTF_K / 256) + GTF_2J) / 2)
376 #define GTF_M_PRIME (GTF_K * GTF_M / 256)
377 struct drm_display_mode *drm_mode;
378 unsigned int hdisplay_rnd, vdisplay_rnd, vfieldrate_rqd;
379 int top_margin, bottom_margin;
380 int interlace;
381 unsigned int hfreq_est;
382 int vsync_plus_bp, vback_porch;
383 unsigned int vtotal_lines, vfieldrate_est, hperiod;
384 unsigned int vfield_rate, vframe_rate;
385 int left_margin, right_margin;
386 unsigned int total_active_pixels, ideal_duty_cycle;
387 unsigned int hblank, total_pixels, pixel_freq;
388 int hsync, hfront_porch, vodd_front_porch_lines;
389 unsigned int tmp1, tmp2;
390
391 drm_mode = drm_mode_create(dev);
392 if (!drm_mode)
393 return NULL;
394
395 /* 1. In order to give correct results, the number of horizontal
396 * pixels requested is first processed to ensure that it is divisible
397 * by the character size, by rounding it to the nearest character
398 * cell boundary:
399 */
400 hdisplay_rnd = (hdisplay + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
401 hdisplay_rnd = hdisplay_rnd * GTF_CELL_GRAN;
402
403 /* 2. If interlace is requested, the number of vertical lines assumed
404 * by the calculation must be halved, as the computation calculates
405 * the number of vertical lines per field.
406 */
407 if (interlaced)
408 vdisplay_rnd = vdisplay / 2;
409 else
410 vdisplay_rnd = vdisplay;
411
412 /* 3. Find the frame rate required: */
413 if (interlaced)
414 vfieldrate_rqd = vrefresh * 2;
415 else
416 vfieldrate_rqd = vrefresh;
417
418 /* 4. Find number of lines in Top margin: */
419 top_margin = 0;
420 if (margins)
421 top_margin = (vdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
422 1000;
423 /* 5. Find number of lines in bottom margin: */
424 bottom_margin = top_margin;
425
426 /* 6. If interlace is required, then set variable interlace: */
427 if (interlaced)
428 interlace = 1;
429 else
430 interlace = 0;
431
432 /* 7. Estimate the Horizontal frequency */
433 {
434 tmp1 = (1000000 - MIN_VSYNC_PLUS_BP * vfieldrate_rqd) / 500;
435 tmp2 = (vdisplay_rnd + 2 * top_margin + GTF_MIN_V_PORCH) *
436 2 + interlace;
437 hfreq_est = (tmp2 * 1000 * vfieldrate_rqd) / tmp1;
438 }
439
440 /* 8. Find the number of lines in V sync + back porch */
441 /* [V SYNC+BP] = RINT(([MIN VSYNC+BP] * hfreq_est / 1000000)) */
442 vsync_plus_bp = MIN_VSYNC_PLUS_BP * hfreq_est / 1000;
443 vsync_plus_bp = (vsync_plus_bp + 500) / 1000;
444 /* 9. Find the number of lines in V back porch alone: */
445 vback_porch = vsync_plus_bp - V_SYNC_RQD;
446 /* 10. Find the total number of lines in Vertical field period: */
447 vtotal_lines = vdisplay_rnd + top_margin + bottom_margin +
448 vsync_plus_bp + GTF_MIN_V_PORCH;
449 /* 11. Estimate the Vertical field frequency: */
450 vfieldrate_est = hfreq_est / vtotal_lines;
451 /* 12. Find the actual horizontal period: */
452 hperiod = 1000000 / (vfieldrate_rqd * vtotal_lines);
453
454 /* 13. Find the actual Vertical field frequency: */
455 vfield_rate = hfreq_est / vtotal_lines;
456 /* 14. Find the Vertical frame frequency: */
457 if (interlaced)
458 vframe_rate = vfield_rate / 2;
459 else
460 vframe_rate = vfield_rate;
461 /* 15. Find number of pixels in left margin: */
462 if (margins)
463 left_margin = (hdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
464 1000;
465 else
466 left_margin = 0;
467
468 /* 16.Find number of pixels in right margin: */
469 right_margin = left_margin;
470 /* 17.Find total number of active pixels in image and left and right */
471 total_active_pixels = hdisplay_rnd + left_margin + right_margin;
472 /* 18.Find the ideal blanking duty cycle from blanking duty cycle */
473 ideal_duty_cycle = GTF_C_PRIME * 1000 -
474 (GTF_M_PRIME * 1000000 / hfreq_est);
475 /* 19.Find the number of pixels in the blanking time to the nearest
476 * double character cell: */
477 hblank = total_active_pixels * ideal_duty_cycle /
478 (100000 - ideal_duty_cycle);
479 hblank = (hblank + GTF_CELL_GRAN) / (2 * GTF_CELL_GRAN);
480 hblank = hblank * 2 * GTF_CELL_GRAN;
481 /* 20.Find total number of pixels: */
482 total_pixels = total_active_pixels + hblank;
483 /* 21.Find pixel clock frequency: */
484 pixel_freq = total_pixels * hfreq_est / 1000;
485 /* Stage 1 computations are now complete; I should really pass
486 * the results to another function and do the Stage 2 computations,
487 * but I only need a few more values so I'll just append the
488 * computations here for now */
489 /* 17. Find the number of pixels in the horizontal sync period: */
490 hsync = H_SYNC_PERCENT * total_pixels / 100;
491 hsync = (hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
492 hsync = hsync * GTF_CELL_GRAN;
493 /* 18. Find the number of pixels in horizontal front porch period */
494 hfront_porch = hblank / 2 - hsync;
495 /* 36. Find the number of lines in the odd front porch period: */
496 vodd_front_porch_lines = GTF_MIN_V_PORCH ;
497
498 /* finally, pack the results in the mode struct */
499 drm_mode->hdisplay = hdisplay_rnd;
500 drm_mode->hsync_start = hdisplay_rnd + hfront_porch;
501 drm_mode->hsync_end = drm_mode->hsync_start + hsync;
502 drm_mode->htotal = total_pixels;
503 drm_mode->vdisplay = vdisplay_rnd;
504 drm_mode->vsync_start = vdisplay_rnd + vodd_front_porch_lines;
505 drm_mode->vsync_end = drm_mode->vsync_start + V_SYNC_RQD;
506 drm_mode->vtotal = vtotal_lines;
507
508 drm_mode->clock = pixel_freq;
509
510 if (interlaced) {
511 drm_mode->vtotal *= 2;
512 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
513 }
514
515 drm_mode_set_name(drm_mode);
516 if (GTF_M == 600 && GTF_2C == 80 && GTF_K == 128 && GTF_2J == 40)
517 drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;
518 else
519 drm_mode->flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC;
520
521 return drm_mode;
522 }
523 EXPORT_SYMBOL(drm_gtf_mode_complex);
524
525 /**
526 * drm_gtf_mode - create the modeline based on GTF algorithm
527 *
528 * @dev :drm device
529 * @hdisplay :hdisplay size
530 * @vdisplay :vdisplay size
531 * @vrefresh :vrefresh rate.
532 * @interlaced :whether the interlace is supported
533 * @margins :whether the margin is supported
534 *
535 * return the modeline based on GTF algorithm
536 *
537 * This function is to create the modeline based on the GTF algorithm.
538 * Generalized Timing Formula is derived from:
539 * GTF Spreadsheet by Andy Morrish (1/5/97)
540 * available at http://www.vesa.org
541 *
542 * And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf.c.
543 * What I have done is to translate it by using integer calculation.
544 * I also refer to the function of fb_get_mode in the file of
545 * drivers/video/fbmon.c
546 *
547 * Standard GTF parameters:
548 * M = 600
549 * C = 40
550 * K = 128
551 * J = 20
552 */
553 struct drm_display_mode *
554 drm_gtf_mode(struct drm_device *dev, int hdisplay, int vdisplay, int vrefresh,
555 bool interlaced, int margins)
556 {
557 return drm_gtf_mode_complex(dev, hdisplay, vdisplay, vrefresh,
558 interlaced, margins,
559 600, 40 * 2, 128, 20 * 2);
560 }
561 EXPORT_SYMBOL(drm_gtf_mode);
562
563 #ifdef CONFIG_VIDEOMODE_HELPERS
564 int drm_display_mode_from_videomode(const struct videomode *vm,
565 struct drm_display_mode *dmode)
566 {
567 dmode->hdisplay = vm->hactive;
568 dmode->hsync_start = dmode->hdisplay + vm->hfront_porch;
569 dmode->hsync_end = dmode->hsync_start + vm->hsync_len;
570 dmode->htotal = dmode->hsync_end + vm->hback_porch;
571
572 dmode->vdisplay = vm->vactive;
573 dmode->vsync_start = dmode->vdisplay + vm->vfront_porch;
574 dmode->vsync_end = dmode->vsync_start + vm->vsync_len;
575 dmode->vtotal = dmode->vsync_end + vm->vback_porch;
576
577 dmode->clock = vm->pixelclock / 1000;
578
579 dmode->flags = 0;
580 if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH)
581 dmode->flags |= DRM_MODE_FLAG_PHSYNC;
582 else if (vm->flags & DISPLAY_FLAGS_HSYNC_LOW)
583 dmode->flags |= DRM_MODE_FLAG_NHSYNC;
584 if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH)
585 dmode->flags |= DRM_MODE_FLAG_PVSYNC;
586 else if (vm->flags & DISPLAY_FLAGS_VSYNC_LOW)
587 dmode->flags |= DRM_MODE_FLAG_NVSYNC;
588 if (vm->flags & DISPLAY_FLAGS_INTERLACED)
589 dmode->flags |= DRM_MODE_FLAG_INTERLACE;
590 if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN)
591 dmode->flags |= DRM_MODE_FLAG_DBLSCAN;
592 if (vm->flags & DISPLAY_FLAGS_DOUBLECLK)
593 dmode->flags |= DRM_MODE_FLAG_DBLCLK;
594 drm_mode_set_name(dmode);
595
596 return 0;
597 }
598 EXPORT_SYMBOL_GPL(drm_display_mode_from_videomode);
599
600 #ifdef CONFIG_OF
601 /**
602 * of_get_drm_display_mode - get a drm_display_mode from devicetree
603 * @np: device_node with the timing specification
604 * @dmode: will be set to the return value
605 * @index: index into the list of display timings in devicetree
606 *
607 * This function is expensive and should only be used, if only one mode is to be
608 * read from DT. To get multiple modes start with of_get_display_timings and
609 * work with that instead.
610 */
611 int of_get_drm_display_mode(struct device_node *np,
612 struct drm_display_mode *dmode, int index)
613 {
614 struct videomode vm;
615 int ret;
616
617 ret = of_get_videomode(np, &vm, index);
618 if (ret)
619 return ret;
620
621 drm_display_mode_from_videomode(&vm, dmode);
622
623 pr_debug("%s: got %dx%d display mode from %s\n",
624 of_node_full_name(np), vm.hactive, vm.vactive, np->name);
625 drm_mode_debug_printmodeline(dmode);
626
627 return 0;
628 }
629 EXPORT_SYMBOL_GPL(of_get_drm_display_mode);
630 #endif /* CONFIG_OF */
631 #endif /* CONFIG_VIDEOMODE_HELPERS */
632
633 /**
634 * drm_mode_set_name - set the name on a mode
635 * @mode: name will be set in this mode
636 *
637 * Set the name of @mode to a standard format.
638 */
639 void drm_mode_set_name(struct drm_display_mode *mode)
640 {
641 bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
642
643 snprintf(mode->name, DRM_DISPLAY_MODE_LEN, "%dx%d%s",
644 mode->hdisplay, mode->vdisplay,
645 interlaced ? "i" : "");
646 }
647 EXPORT_SYMBOL(drm_mode_set_name);
648
649 /**
650 * drm_mode_width - get the width of a mode
651 * @mode: mode
652 *
653 * Return @mode's width (hdisplay) value.
654 *
655 * FIXME: is this needed?
656 *
657 * RETURNS:
658 * @mode->hdisplay
659 */
660 int drm_mode_width(const struct drm_display_mode *mode)
661 {
662 return mode->hdisplay;
663
664 }
665 EXPORT_SYMBOL(drm_mode_width);
666
667 /**
668 * drm_mode_height - get the height of a mode
669 * @mode: mode
670 *
671 * Return @mode's height (vdisplay) value.
672 *
673 * FIXME: is this needed?
674 *
675 * RETURNS:
676 * @mode->vdisplay
677 */
678 int drm_mode_height(const struct drm_display_mode *mode)
679 {
680 return mode->vdisplay;
681 }
682 EXPORT_SYMBOL(drm_mode_height);
683
684 /** drm_mode_hsync - get the hsync of a mode
685 * @mode: mode
686 *
687 * Return @modes's hsync rate in kHz, rounded to the nearest int.
688 */
689 int drm_mode_hsync(const struct drm_display_mode *mode)
690 {
691 unsigned int calc_val;
692
693 if (mode->hsync)
694 return mode->hsync;
695
696 if (mode->htotal < 0)
697 return 0;
698
699 calc_val = (mode->clock * 1000) / mode->htotal; /* hsync in Hz */
700 calc_val += 500; /* round to 1000Hz */
701 calc_val /= 1000; /* truncate to kHz */
702
703 return calc_val;
704 }
705 EXPORT_SYMBOL(drm_mode_hsync);
706
707 /**
708 * drm_mode_vrefresh - get the vrefresh of a mode
709 * @mode: mode
710 *
711 * Return @mode's vrefresh rate in Hz or calculate it if necessary.
712 *
713 * FIXME: why is this needed? shouldn't vrefresh be set already?
714 *
715 * RETURNS:
716 * Vertical refresh rate. It will be the result of actual value plus 0.5.
717 * If it is 70.288, it will return 70Hz.
718 * If it is 59.6, it will return 60Hz.
719 */
720 int drm_mode_vrefresh(const struct drm_display_mode *mode)
721 {
722 int refresh = 0;
723 unsigned int calc_val;
724
725 if (mode->vrefresh > 0)
726 refresh = mode->vrefresh;
727 else if (mode->htotal > 0 && mode->vtotal > 0) {
728 int vtotal;
729 vtotal = mode->vtotal;
730 /* work out vrefresh the value will be x1000 */
731 calc_val = (mode->clock * 1000);
732 calc_val /= mode->htotal;
733 refresh = (calc_val + vtotal / 2) / vtotal;
734
735 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
736 refresh *= 2;
737 if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
738 refresh /= 2;
739 if (mode->vscan > 1)
740 refresh /= mode->vscan;
741 }
742 return refresh;
743 }
744 EXPORT_SYMBOL(drm_mode_vrefresh);
745
746 /**
747 * drm_mode_set_crtcinfo - set CRTC modesetting parameters
748 * @p: mode
749 * @adjust_flags: a combination of adjustment flags
750 *
751 * Setup the CRTC modesetting parameters for @p, adjusting if necessary.
752 *
753 * - The CRTC_INTERLACE_HALVE_V flag can be used to halve vertical timings of
754 * interlaced modes.
755 * - The CRTC_STEREO_DOUBLE flag can be used to compute the timings for
756 * buffers containing two eyes (only adjust the timings when needed, eg. for
757 * "frame packing" or "side by side full").
758 */
759 void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
760 {
761 if ((p == NULL) || ((p->type & DRM_MODE_TYPE_CRTC_C) == DRM_MODE_TYPE_BUILTIN))
762 return;
763
764 p->crtc_clock = p->clock;
765 p->crtc_hdisplay = p->hdisplay;
766 p->crtc_hsync_start = p->hsync_start;
767 p->crtc_hsync_end = p->hsync_end;
768 p->crtc_htotal = p->htotal;
769 p->crtc_hskew = p->hskew;
770 p->crtc_vdisplay = p->vdisplay;
771 p->crtc_vsync_start = p->vsync_start;
772 p->crtc_vsync_end = p->vsync_end;
773 p->crtc_vtotal = p->vtotal;
774
775 if (p->flags & DRM_MODE_FLAG_INTERLACE) {
776 if (adjust_flags & CRTC_INTERLACE_HALVE_V) {
777 p->crtc_vdisplay /= 2;
778 p->crtc_vsync_start /= 2;
779 p->crtc_vsync_end /= 2;
780 p->crtc_vtotal /= 2;
781 }
782 }
783
784 if (p->flags & DRM_MODE_FLAG_DBLSCAN) {
785 p->crtc_vdisplay *= 2;
786 p->crtc_vsync_start *= 2;
787 p->crtc_vsync_end *= 2;
788 p->crtc_vtotal *= 2;
789 }
790
791 if (p->vscan > 1) {
792 p->crtc_vdisplay *= p->vscan;
793 p->crtc_vsync_start *= p->vscan;
794 p->crtc_vsync_end *= p->vscan;
795 p->crtc_vtotal *= p->vscan;
796 }
797
798 if (adjust_flags & CRTC_STEREO_DOUBLE) {
799 unsigned int layout = p->flags & DRM_MODE_FLAG_3D_MASK;
800
801 switch (layout) {
802 case DRM_MODE_FLAG_3D_FRAME_PACKING:
803 p->crtc_clock *= 2;
804 p->crtc_vdisplay += p->crtc_vtotal;
805 p->crtc_vsync_start += p->crtc_vtotal;
806 p->crtc_vsync_end += p->crtc_vtotal;
807 p->crtc_vtotal += p->crtc_vtotal;
808 break;
809 }
810 }
811
812 p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
813 p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
814 p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);
815 p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);
816 }
817 EXPORT_SYMBOL(drm_mode_set_crtcinfo);
818
819
820 /**
821 * drm_mode_copy - copy the mode
822 * @dst: mode to overwrite
823 * @src: mode to copy
824 *
825 * Copy an existing mode into another mode, preserving the object id and
826 * list head of the destination mode.
827 */
828 void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode *src)
829 {
830 int id = dst->base.id;
831 struct list_head head = dst->head;
832
833 *dst = *src;
834 dst->base.id = id;
835 dst->head = head;
836 }
837 EXPORT_SYMBOL(drm_mode_copy);
838
839 /**
840 * drm_mode_duplicate - allocate and duplicate an existing mode
841 * @dev: drm_device to allocate the duplicated mode for
842 * @mode: mode to duplicate
843 *
844 * Just allocate a new mode, copy the existing mode into it, and return
845 * a pointer to it. Used to create new instances of established modes.
846 */
847 struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
848 const struct drm_display_mode *mode)
849 {
850 struct drm_display_mode *nmode;
851
852 nmode = drm_mode_create(dev);
853 if (!nmode)
854 return NULL;
855
856 drm_mode_copy(nmode, mode);
857
858 return nmode;
859 }
860 EXPORT_SYMBOL(drm_mode_duplicate);
861
862 /**
863 * drm_mode_equal - test modes for equality
864 * @mode1: first mode
865 * @mode2: second mode
866 *
867 * Check to see if @mode1 and @mode2 are equivalent.
868 *
869 * RETURNS:
870 * True if the modes are equal, false otherwise.
871 */
872 bool drm_mode_equal(const struct drm_display_mode *mode1, const struct drm_display_mode *mode2)
873 {
874 /* do clock check convert to PICOS so fb modes get matched
875 * the same */
876 if (mode1->clock && mode2->clock) {
877 if (KHZ2PICOS(mode1->clock) != KHZ2PICOS(mode2->clock))
878 return false;
879 } else if (mode1->clock != mode2->clock)
880 return false;
881
882 if ((mode1->flags & DRM_MODE_FLAG_3D_MASK) !=
883 (mode2->flags & DRM_MODE_FLAG_3D_MASK))
884 return false;
885
886 return drm_mode_equal_no_clocks_no_stereo(mode1, mode2);
887 }
888 EXPORT_SYMBOL(drm_mode_equal);
889
890 /**
891 * drm_mode_equal_no_clocks_no_stereo - test modes for equality
892 * @mode1: first mode
893 * @mode2: second mode
894 *
895 * Check to see if @mode1 and @mode2 are equivalent, but
896 * don't check the pixel clocks nor the stereo layout.
897 *
898 * RETURNS:
899 * True if the modes are equal, false otherwise.
900 */
901 bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1,
902 const struct drm_display_mode *mode2)
903 {
904 if (mode1->hdisplay == mode2->hdisplay &&
905 mode1->hsync_start == mode2->hsync_start &&
906 mode1->hsync_end == mode2->hsync_end &&
907 mode1->htotal == mode2->htotal &&
908 mode1->hskew == mode2->hskew &&
909 mode1->vdisplay == mode2->vdisplay &&
910 mode1->vsync_start == mode2->vsync_start &&
911 mode1->vsync_end == mode2->vsync_end &&
912 mode1->vtotal == mode2->vtotal &&
913 mode1->vscan == mode2->vscan &&
914 (mode1->flags & ~DRM_MODE_FLAG_3D_MASK) ==
915 (mode2->flags & ~DRM_MODE_FLAG_3D_MASK))
916 return true;
917
918 return false;
919 }
920 EXPORT_SYMBOL(drm_mode_equal_no_clocks_no_stereo);
921
922 /**
923 * drm_mode_validate_size - make sure modes adhere to size constraints
924 * @dev: DRM device
925 * @mode_list: list of modes to check
926 * @maxX: maximum width
927 * @maxY: maximum height
928 * @maxPitch: max pitch
929 *
930 * The DRM device (@dev) has size and pitch limits. Here we validate the
931 * modes we probed for @dev against those limits and set their status as
932 * necessary.
933 */
934 void drm_mode_validate_size(struct drm_device *dev,
935 struct list_head *mode_list,
936 int maxX, int maxY, int maxPitch)
937 {
938 struct drm_display_mode *mode;
939
940 list_for_each_entry(mode, mode_list, head) {
941 if (maxPitch > 0 && mode->hdisplay > maxPitch)
942 mode->status = MODE_BAD_WIDTH;
943
944 if (maxX > 0 && mode->hdisplay > maxX)
945 mode->status = MODE_VIRTUAL_X;
946
947 if (maxY > 0 && mode->vdisplay > maxY)
948 mode->status = MODE_VIRTUAL_Y;
949 }
950 }
951 EXPORT_SYMBOL(drm_mode_validate_size);
952
953 /**
954 * drm_mode_prune_invalid - remove invalid modes from mode list
955 * @dev: DRM device
956 * @mode_list: list of modes to check
957 * @verbose: be verbose about it
958 *
959 * Once mode list generation is complete, a caller can use this routine to
960 * remove invalid modes from a mode list. If any of the modes have a
961 * status other than %MODE_OK, they are removed from @mode_list and freed.
962 */
963 void drm_mode_prune_invalid(struct drm_device *dev,
964 struct list_head *mode_list, bool verbose)
965 {
966 struct drm_display_mode *mode, *t;
967
968 list_for_each_entry_safe(mode, t, mode_list, head) {
969 if (mode->status != MODE_OK) {
970 list_del(&mode->head);
971 if (verbose) {
972 drm_mode_debug_printmodeline(mode);
973 DRM_DEBUG_KMS("Not using %s mode %d\n",
974 mode->name, mode->status);
975 }
976 drm_mode_destroy(dev, mode);
977 }
978 }
979 }
980 EXPORT_SYMBOL(drm_mode_prune_invalid);
981
982 /**
983 * drm_mode_compare - compare modes for favorability
984 * @priv: unused
985 * @lh_a: list_head for first mode
986 * @lh_b: list_head for second mode
987 *
988 * Compare two modes, given by @lh_a and @lh_b, returning a value indicating
989 * which is better.
990 *
991 * RETURNS:
992 * Negative if @lh_a is better than @lh_b, zero if they're equivalent, or
993 * positive if @lh_b is better than @lh_a.
994 */
995 static int drm_mode_compare(void *priv, struct list_head *lh_a, struct list_head *lh_b)
996 {
997 struct drm_display_mode *a = list_entry(lh_a, struct drm_display_mode, head);
998 struct drm_display_mode *b = list_entry(lh_b, struct drm_display_mode, head);
999 int diff;
1000
1001 diff = ((b->type & DRM_MODE_TYPE_PREFERRED) != 0) -
1002 ((a->type & DRM_MODE_TYPE_PREFERRED) != 0);
1003 if (diff)
1004 return diff;
1005 diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay;
1006 if (diff)
1007 return diff;
1008
1009 diff = b->vrefresh - a->vrefresh;
1010 if (diff)
1011 return diff;
1012
1013 diff = b->clock - a->clock;
1014 return diff;
1015 }
1016
1017 /**
1018 * drm_mode_sort - sort mode list
1019 * @mode_list: list to sort
1020 *
1021 * Sort @mode_list by favorability, putting good modes first.
1022 */
1023 void drm_mode_sort(struct list_head *mode_list)
1024 {
1025 list_sort(NULL, mode_list, drm_mode_compare);
1026 }
1027 EXPORT_SYMBOL(drm_mode_sort);
1028
1029 /**
1030 * drm_mode_connector_list_update - update the mode list for the connector
1031 * @connector: the connector to update
1032 *
1033 * This moves the modes from the @connector probed_modes list
1034 * to the actual mode list. It compares the probed mode against the current
1035 * list and only adds different modes. All modes unverified after this point
1036 * will be removed by the prune invalid modes.
1037 */
1038 void drm_mode_connector_list_update(struct drm_connector *connector)
1039 {
1040 struct drm_display_mode *mode;
1041 struct drm_display_mode *pmode, *pt;
1042 int found_it;
1043
1044 WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
1045
1046 list_for_each_entry_safe(pmode, pt, &connector->probed_modes,
1047 head) {
1048 found_it = 0;
1049 /* go through current modes checking for the new probed mode */
1050 list_for_each_entry(mode, &connector->modes, head) {
1051 if (drm_mode_equal(pmode, mode)) {
1052 found_it = 1;
1053 /* if equal delete the probed mode */
1054 mode->status = pmode->status;
1055 /* Merge type bits together */
1056 mode->type |= pmode->type;
1057 list_del(&pmode->head);
1058 drm_mode_destroy(connector->dev, pmode);
1059 break;
1060 }
1061 }
1062
1063 if (!found_it) {
1064 list_move_tail(&pmode->head, &connector->modes);
1065 }
1066 }
1067 }
1068 EXPORT_SYMBOL(drm_mode_connector_list_update);
1069
1070 /**
1071 * drm_mode_parse_command_line_for_connector - parse command line for connector
1072 * @mode_option: per connector mode option
1073 * @connector: connector to parse line for
1074 * @mode: preallocated mode structure to fill out
1075 *
1076 * This parses the connector specific then generic command lines for
1077 * modes and options to configure the connector.
1078 *
1079 * This uses the same parameters as the fb modedb.c, except for extra
1080 * <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
1081 *
1082 * enable/enable Digital/disable bit at the end
1083 */
1084 bool drm_mode_parse_command_line_for_connector(const char *mode_option,
1085 struct drm_connector *connector,
1086 struct drm_cmdline_mode *mode)
1087 {
1088 const char *name;
1089 unsigned int namelen;
1090 bool res_specified = false, bpp_specified = false, refresh_specified = false;
1091 unsigned int xres = 0, yres = 0, bpp = 32, refresh = 0;
1092 bool yres_specified = false, cvt = false, rb = false;
1093 bool interlace = false, margins = false, was_digit = false;
1094 int i;
1095 enum drm_connector_force force = DRM_FORCE_UNSPECIFIED;
1096
1097 #ifdef CONFIG_FB
1098 if (!mode_option)
1099 mode_option = fb_mode_option;
1100 #endif
1101
1102 if (!mode_option) {
1103 mode->specified = false;
1104 return false;
1105 }
1106
1107 name = mode_option;
1108 namelen = strlen(name);
1109 for (i = namelen-1; i >= 0; i--) {
1110 switch (name[i]) {
1111 case '@':
1112 if (!refresh_specified && !bpp_specified &&
1113 !yres_specified && !cvt && !rb && was_digit) {
1114 refresh = simple_strtol(&name[i+1], NULL, 10);
1115 refresh_specified = true;
1116 was_digit = false;
1117 } else
1118 goto done;
1119 break;
1120 case '-':
1121 if (!bpp_specified && !yres_specified && !cvt &&
1122 !rb && was_digit) {
1123 bpp = simple_strtol(&name[i+1], NULL, 10);
1124 bpp_specified = true;
1125 was_digit = false;
1126 } else
1127 goto done;
1128 break;
1129 case 'x':
1130 if (!yres_specified && was_digit) {
1131 yres = simple_strtol(&name[i+1], NULL, 10);
1132 yres_specified = true;
1133 was_digit = false;
1134 } else
1135 goto done;
1136 break;
1137 case '0' ... '9':
1138 was_digit = true;
1139 break;
1140 case 'M':
1141 if (yres_specified || cvt || was_digit)
1142 goto done;
1143 cvt = true;
1144 break;
1145 case 'R':
1146 if (yres_specified || cvt || rb || was_digit)
1147 goto done;
1148 rb = true;
1149 break;
1150 case 'm':
1151 if (cvt || yres_specified || was_digit)
1152 goto done;
1153 margins = true;
1154 break;
1155 case 'i':
1156 if (cvt || yres_specified || was_digit)
1157 goto done;
1158 interlace = true;
1159 break;
1160 case 'e':
1161 if (yres_specified || bpp_specified || refresh_specified ||
1162 was_digit || (force != DRM_FORCE_UNSPECIFIED))
1163 goto done;
1164
1165 force = DRM_FORCE_ON;
1166 break;
1167 case 'D':
1168 if (yres_specified || bpp_specified || refresh_specified ||
1169 was_digit || (force != DRM_FORCE_UNSPECIFIED))
1170 goto done;
1171
1172 if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
1173 (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
1174 force = DRM_FORCE_ON;
1175 else
1176 force = DRM_FORCE_ON_DIGITAL;
1177 break;
1178 case 'd':
1179 if (yres_specified || bpp_specified || refresh_specified ||
1180 was_digit || (force != DRM_FORCE_UNSPECIFIED))
1181 goto done;
1182
1183 force = DRM_FORCE_OFF;
1184 break;
1185 default:
1186 goto done;
1187 }
1188 }
1189
1190 if (i < 0 && yres_specified) {
1191 char *ch;
1192 xres = simple_strtol(name, &ch, 10);
1193 if ((ch != NULL) && (*ch == 'x'))
1194 res_specified = true;
1195 else
1196 i = ch - name;
1197 } else if (!yres_specified && was_digit) {
1198 /* catch mode that begins with digits but has no 'x' */
1199 i = 0;
1200 }
1201 done:
1202 if (i >= 0) {
1203 printk(KERN_WARNING
1204 "parse error at position %i in video mode '%s'\n",
1205 i, name);
1206 mode->specified = false;
1207 return false;
1208 }
1209
1210 if (res_specified) {
1211 mode->specified = true;
1212 mode->xres = xres;
1213 mode->yres = yres;
1214 }
1215
1216 if (refresh_specified) {
1217 mode->refresh_specified = true;
1218 mode->refresh = refresh;
1219 }
1220
1221 if (bpp_specified) {
1222 mode->bpp_specified = true;
1223 mode->bpp = bpp;
1224 }
1225 mode->rb = rb;
1226 mode->cvt = cvt;
1227 mode->interlace = interlace;
1228 mode->margins = margins;
1229 mode->force = force;
1230
1231 return true;
1232 }
1233 EXPORT_SYMBOL(drm_mode_parse_command_line_for_connector);
1234
1235 struct drm_display_mode *
1236 drm_mode_create_from_cmdline_mode(struct drm_device *dev,
1237 struct drm_cmdline_mode *cmd)
1238 {
1239 struct drm_display_mode *mode;
1240
1241 if (cmd->cvt)
1242 mode = drm_cvt_mode(dev,
1243 cmd->xres, cmd->yres,
1244 cmd->refresh_specified ? cmd->refresh : 60,
1245 cmd->rb, cmd->interlace,
1246 cmd->margins);
1247 else
1248 mode = drm_gtf_mode(dev,
1249 cmd->xres, cmd->yres,
1250 cmd->refresh_specified ? cmd->refresh : 60,
1251 cmd->interlace,
1252 cmd->margins);
1253 if (!mode)
1254 return NULL;
1255
1256 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
1257 return mode;
1258 }
1259 EXPORT_SYMBOL(drm_mode_create_from_cmdline_mode);
Linux kernel - Deliverables
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