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 #include <drm/drm_modes.h>
41
42 #include "drm_crtc_internal.h"
43
44 /**
45 * drm_mode_debug_printmodeline - print a mode to dmesg
46 * @mode: mode to print
47 *
48 * Describe @mode using DRM_DEBUG.
49 */
drm_mode_debug_printmodeline(const struct drm_display_mode * mode)50 void drm_mode_debug_printmodeline(const struct drm_display_mode *mode)
51 {
52 DRM_DEBUG_KMS("Modeline " DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
53 }
54 EXPORT_SYMBOL(drm_mode_debug_printmodeline);
55
56 /**
57 * drm_mode_create - create a new display mode
58 * @dev: DRM device
59 *
60 * Create a new, cleared drm_display_mode with kzalloc, allocate an ID for it
61 * and return it.
62 *
63 * Returns:
64 * Pointer to new mode on success, NULL on error.
65 */
drm_mode_create(struct drm_device * dev)66 struct drm_display_mode *drm_mode_create(struct drm_device *dev)
67 {
68 struct drm_display_mode *nmode;
69
70 nmode = kzalloc(sizeof(struct drm_display_mode), GFP_KERNEL);
71 if (!nmode)
72 return NULL;
73
74 if (drm_mode_object_add(dev, &nmode->base, DRM_MODE_OBJECT_MODE)) {
75 kfree(nmode);
76 return NULL;
77 }
78
79 return nmode;
80 }
81 EXPORT_SYMBOL(drm_mode_create);
82
83 /**
84 * drm_mode_destroy - remove a mode
85 * @dev: DRM device
86 * @mode: mode to remove
87 *
88 * Release @mode's unique ID, then free it @mode structure itself using kfree.
89 */
drm_mode_destroy(struct drm_device * dev,struct drm_display_mode * mode)90 void drm_mode_destroy(struct drm_device *dev, struct drm_display_mode *mode)
91 {
92 if (!mode)
93 return;
94
95 drm_mode_object_unregister(dev, &mode->base);
96
97 kfree(mode);
98 }
99 EXPORT_SYMBOL(drm_mode_destroy);
100
101 /**
102 * drm_mode_probed_add - add a mode to a connector's probed_mode list
103 * @connector: connector the new mode
104 * @mode: mode data
105 *
106 * Add @mode to @connector's probed_mode list for later use. This list should
107 * then in a second step get filtered and all the modes actually supported by
108 * the hardware moved to the @connector's modes list.
109 */
drm_mode_probed_add(struct drm_connector * connector,struct drm_display_mode * mode)110 void drm_mode_probed_add(struct drm_connector *connector,
111 struct drm_display_mode *mode)
112 {
113 WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
114
115 list_add_tail(&mode->head, &connector->probed_modes);
116 }
117 EXPORT_SYMBOL(drm_mode_probed_add);
118
119 /**
120 * drm_cvt_mode -create a modeline based on the CVT algorithm
121 * @dev: drm device
122 * @hdisplay: hdisplay size
123 * @vdisplay: vdisplay size
124 * @vrefresh: vrefresh rate
125 * @reduced: whether to use reduced blanking
126 * @interlaced: whether to compute an interlaced mode
127 * @margins: whether to add margins (borders)
128 *
129 * This function is called to generate the modeline based on CVT algorithm
130 * according to the hdisplay, vdisplay, vrefresh.
131 * It is based from the VESA(TM) Coordinated Video Timing Generator by
132 * Graham Loveridge April 9, 2003 available at
133 * http://www.elo.utfsm.cl/~elo212/docs/CVTd6r1.xls
134 *
135 * And it is copied from xf86CVTmode in xserver/hw/xfree86/modes/xf86cvt.c.
136 * What I have done is to translate it by using integer calculation.
137 *
138 * Returns:
139 * The modeline based on the CVT algorithm stored in a drm_display_mode object.
140 * The display mode object is allocated with drm_mode_create(). Returns NULL
141 * when no mode could be allocated.
142 */
drm_cvt_mode(struct drm_device * dev,int hdisplay,int vdisplay,int vrefresh,bool reduced,bool interlaced,bool margins)143 struct drm_display_mode *drm_cvt_mode(struct drm_device *dev, int hdisplay,
144 int vdisplay, int vrefresh,
145 bool reduced, bool interlaced, bool margins)
146 {
147 #define HV_FACTOR 1000
148 /* 1) top/bottom margin size (% of height) - default: 1.8, */
149 #define CVT_MARGIN_PERCENTAGE 18
150 /* 2) character cell horizontal granularity (pixels) - default 8 */
151 #define CVT_H_GRANULARITY 8
152 /* 3) Minimum vertical porch (lines) - default 3 */
153 #define CVT_MIN_V_PORCH 3
154 /* 4) Minimum number of vertical back porch lines - default 6 */
155 #define CVT_MIN_V_BPORCH 6
156 /* Pixel Clock step (kHz) */
157 #define CVT_CLOCK_STEP 250
158 struct drm_display_mode *drm_mode;
159 unsigned int vfieldrate, hperiod;
160 int hdisplay_rnd, hmargin, vdisplay_rnd, vmargin, vsync;
161 int interlace;
162 u64 tmp;
163
164 /* allocate the drm_display_mode structure. If failure, we will
165 * return directly
166 */
167 drm_mode = drm_mode_create(dev);
168 if (!drm_mode)
169 return NULL;
170
171 /* the CVT default refresh rate is 60Hz */
172 if (!vrefresh)
173 vrefresh = 60;
174
175 /* the required field fresh rate */
176 if (interlaced)
177 vfieldrate = vrefresh * 2;
178 else
179 vfieldrate = vrefresh;
180
181 /* horizontal pixels */
182 hdisplay_rnd = hdisplay - (hdisplay % CVT_H_GRANULARITY);
183
184 /* determine the left&right borders */
185 hmargin = 0;
186 if (margins) {
187 hmargin = hdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
188 hmargin -= hmargin % CVT_H_GRANULARITY;
189 }
190 /* find the total active pixels */
191 drm_mode->hdisplay = hdisplay_rnd + 2 * hmargin;
192
193 /* find the number of lines per field */
194 if (interlaced)
195 vdisplay_rnd = vdisplay / 2;
196 else
197 vdisplay_rnd = vdisplay;
198
199 /* find the top & bottom borders */
200 vmargin = 0;
201 if (margins)
202 vmargin = vdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
203
204 drm_mode->vdisplay = vdisplay + 2 * vmargin;
205
206 /* Interlaced */
207 if (interlaced)
208 interlace = 1;
209 else
210 interlace = 0;
211
212 /* Determine VSync Width from aspect ratio */
213 if (!(vdisplay % 3) && ((vdisplay * 4 / 3) == hdisplay))
214 vsync = 4;
215 else if (!(vdisplay % 9) && ((vdisplay * 16 / 9) == hdisplay))
216 vsync = 5;
217 else if (!(vdisplay % 10) && ((vdisplay * 16 / 10) == hdisplay))
218 vsync = 6;
219 else if (!(vdisplay % 4) && ((vdisplay * 5 / 4) == hdisplay))
220 vsync = 7;
221 else if (!(vdisplay % 9) && ((vdisplay * 15 / 9) == hdisplay))
222 vsync = 7;
223 else /* custom */
224 vsync = 10;
225
226 if (!reduced) {
227 /* simplify the GTF calculation */
228 /* 4) Minimum time of vertical sync + back porch interval (µs)
229 * default 550.0
230 */
231 int tmp1, tmp2;
232 #define CVT_MIN_VSYNC_BP 550
233 /* 3) Nominal HSync width (% of line period) - default 8 */
234 #define CVT_HSYNC_PERCENTAGE 8
235 unsigned int hblank_percentage;
236 int vsyncandback_porch, vback_porch, hblank;
237
238 /* estimated the horizontal period */
239 tmp1 = HV_FACTOR * 1000000 -
240 CVT_MIN_VSYNC_BP * HV_FACTOR * vfieldrate;
241 tmp2 = (vdisplay_rnd + 2 * vmargin + CVT_MIN_V_PORCH) * 2 +
242 interlace;
243 hperiod = tmp1 * 2 / (tmp2 * vfieldrate);
244
245 tmp1 = CVT_MIN_VSYNC_BP * HV_FACTOR / hperiod + 1;
246 /* 9. Find number of lines in sync + backporch */
247 if (tmp1 < (vsync + CVT_MIN_V_PORCH))
248 vsyncandback_porch = vsync + CVT_MIN_V_PORCH;
249 else
250 vsyncandback_porch = tmp1;
251 /* 10. Find number of lines in back porch */
252 vback_porch = vsyncandback_porch - vsync;
253 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin +
254 vsyncandback_porch + CVT_MIN_V_PORCH;
255 /* 5) Definition of Horizontal blanking time limitation */
256 /* Gradient (%/kHz) - default 600 */
257 #define CVT_M_FACTOR 600
258 /* Offset (%) - default 40 */
259 #define CVT_C_FACTOR 40
260 /* Blanking time scaling factor - default 128 */
261 #define CVT_K_FACTOR 128
262 /* Scaling factor weighting - default 20 */
263 #define CVT_J_FACTOR 20
264 #define CVT_M_PRIME (CVT_M_FACTOR * CVT_K_FACTOR / 256)
265 #define CVT_C_PRIME ((CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + \
266 CVT_J_FACTOR)
267 /* 12. Find ideal blanking duty cycle from formula */
268 hblank_percentage = CVT_C_PRIME * HV_FACTOR - CVT_M_PRIME *
269 hperiod / 1000;
270 /* 13. Blanking time */
271 if (hblank_percentage < 20 * HV_FACTOR)
272 hblank_percentage = 20 * HV_FACTOR;
273 hblank = drm_mode->hdisplay * hblank_percentage /
274 (100 * HV_FACTOR - hblank_percentage);
275 hblank -= hblank % (2 * CVT_H_GRANULARITY);
276 /* 14. find the total pixels per line */
277 drm_mode->htotal = drm_mode->hdisplay + hblank;
278 drm_mode->hsync_end = drm_mode->hdisplay + hblank / 2;
279 drm_mode->hsync_start = drm_mode->hsync_end -
280 (drm_mode->htotal * CVT_HSYNC_PERCENTAGE) / 100;
281 drm_mode->hsync_start += CVT_H_GRANULARITY -
282 drm_mode->hsync_start % CVT_H_GRANULARITY;
283 /* fill the Vsync values */
284 drm_mode->vsync_start = drm_mode->vdisplay + CVT_MIN_V_PORCH;
285 drm_mode->vsync_end = drm_mode->vsync_start + vsync;
286 } else {
287 /* Reduced blanking */
288 /* Minimum vertical blanking interval time (µs)- default 460 */
289 #define CVT_RB_MIN_VBLANK 460
290 /* Fixed number of clocks for horizontal sync */
291 #define CVT_RB_H_SYNC 32
292 /* Fixed number of clocks for horizontal blanking */
293 #define CVT_RB_H_BLANK 160
294 /* Fixed number of lines for vertical front porch - default 3*/
295 #define CVT_RB_VFPORCH 3
296 int vbilines;
297 int tmp1, tmp2;
298 /* 8. Estimate Horizontal period. */
299 tmp1 = HV_FACTOR * 1000000 -
300 CVT_RB_MIN_VBLANK * HV_FACTOR * vfieldrate;
301 tmp2 = vdisplay_rnd + 2 * vmargin;
302 hperiod = tmp1 / (tmp2 * vfieldrate);
303 /* 9. Find number of lines in vertical blanking */
304 vbilines = CVT_RB_MIN_VBLANK * HV_FACTOR / hperiod + 1;
305 /* 10. Check if vertical blanking is sufficient */
306 if (vbilines < (CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH))
307 vbilines = CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH;
308 /* 11. Find total number of lines in vertical field */
309 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin + vbilines;
310 /* 12. Find total number of pixels in a line */
311 drm_mode->htotal = drm_mode->hdisplay + CVT_RB_H_BLANK;
312 /* Fill in HSync values */
313 drm_mode->hsync_end = drm_mode->hdisplay + CVT_RB_H_BLANK / 2;
314 drm_mode->hsync_start = drm_mode->hsync_end - CVT_RB_H_SYNC;
315 /* Fill in VSync values */
316 drm_mode->vsync_start = drm_mode->vdisplay + CVT_RB_VFPORCH;
317 drm_mode->vsync_end = drm_mode->vsync_start + vsync;
318 }
319 /* 15/13. Find pixel clock frequency (kHz for xf86) */
320 tmp = drm_mode->htotal; /* perform intermediate calcs in u64 */
321 tmp *= HV_FACTOR * 1000;
322 do_div(tmp, hperiod);
323 tmp -= drm_mode->clock % CVT_CLOCK_STEP;
324 drm_mode->clock = tmp;
325 /* 18/16. Find actual vertical frame frequency */
326 /* ignore - just set the mode flag for interlaced */
327 if (interlaced) {
328 drm_mode->vtotal *= 2;
329 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
330 }
331 /* Fill the mode line name */
332 drm_mode_set_name(drm_mode);
333 if (reduced)
334 drm_mode->flags |= (DRM_MODE_FLAG_PHSYNC |
335 DRM_MODE_FLAG_NVSYNC);
336 else
337 drm_mode->flags |= (DRM_MODE_FLAG_PVSYNC |
338 DRM_MODE_FLAG_NHSYNC);
339
340 return drm_mode;
341 }
342 EXPORT_SYMBOL(drm_cvt_mode);
343
344 /**
345 * drm_gtf_mode_complex - create the modeline based on the full GTF algorithm
346 * @dev: drm device
347 * @hdisplay: hdisplay size
348 * @vdisplay: vdisplay size
349 * @vrefresh: vrefresh rate.
350 * @interlaced: whether to compute an interlaced mode
351 * @margins: desired margin (borders) size
352 * @GTF_M: extended GTF formula parameters
353 * @GTF_2C: extended GTF formula parameters
354 * @GTF_K: extended GTF formula parameters
355 * @GTF_2J: extended GTF formula parameters
356 *
357 * GTF feature blocks specify C and J in multiples of 0.5, so we pass them
358 * in here multiplied by two. For a C of 40, pass in 80.
359 *
360 * Returns:
361 * The modeline based on the full GTF algorithm stored in a drm_display_mode object.
362 * The display mode object is allocated with drm_mode_create(). Returns NULL
363 * when no mode could be allocated.
364 */
365 struct drm_display_mode *
drm_gtf_mode_complex(struct drm_device * dev,int hdisplay,int vdisplay,int vrefresh,bool interlaced,int margins,int GTF_M,int GTF_2C,int GTF_K,int GTF_2J)366 drm_gtf_mode_complex(struct drm_device *dev, int hdisplay, int vdisplay,
367 int vrefresh, bool interlaced, int margins,
368 int GTF_M, int GTF_2C, int GTF_K, int GTF_2J)
369 { /* 1) top/bottom margin size (% of height) - default: 1.8, */
370 #define GTF_MARGIN_PERCENTAGE 18
371 /* 2) character cell horizontal granularity (pixels) - default 8 */
372 #define GTF_CELL_GRAN 8
373 /* 3) Minimum vertical porch (lines) - default 3 */
374 #define GTF_MIN_V_PORCH 1
375 /* width of vsync in lines */
376 #define V_SYNC_RQD 3
377 /* width of hsync as % of total line */
378 #define H_SYNC_PERCENT 8
379 /* min time of vsync + back porch (microsec) */
380 #define MIN_VSYNC_PLUS_BP 550
381 /* C' and M' are part of the Blanking Duty Cycle computation */
382 #define GTF_C_PRIME ((((GTF_2C - GTF_2J) * GTF_K / 256) + GTF_2J) / 2)
383 #define GTF_M_PRIME (GTF_K * GTF_M / 256)
384 struct drm_display_mode *drm_mode;
385 unsigned int hdisplay_rnd, vdisplay_rnd, vfieldrate_rqd;
386 int top_margin, bottom_margin;
387 int interlace;
388 unsigned int hfreq_est;
389 int vsync_plus_bp, vback_porch;
390 unsigned int vtotal_lines, vfieldrate_est, hperiod;
391 unsigned int vfield_rate, vframe_rate;
392 int left_margin, right_margin;
393 unsigned int total_active_pixels, ideal_duty_cycle;
394 unsigned int hblank, total_pixels, pixel_freq;
395 int hsync, hfront_porch, vodd_front_porch_lines;
396 unsigned int tmp1, tmp2;
397
398 drm_mode = drm_mode_create(dev);
399 if (!drm_mode)
400 return NULL;
401
402 /* 1. In order to give correct results, the number of horizontal
403 * pixels requested is first processed to ensure that it is divisible
404 * by the character size, by rounding it to the nearest character
405 * cell boundary:
406 */
407 hdisplay_rnd = (hdisplay + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
408 hdisplay_rnd = hdisplay_rnd * GTF_CELL_GRAN;
409
410 /* 2. If interlace is requested, the number of vertical lines assumed
411 * by the calculation must be halved, as the computation calculates
412 * the number of vertical lines per field.
413 */
414 if (interlaced)
415 vdisplay_rnd = vdisplay / 2;
416 else
417 vdisplay_rnd = vdisplay;
418
419 /* 3. Find the frame rate required: */
420 if (interlaced)
421 vfieldrate_rqd = vrefresh * 2;
422 else
423 vfieldrate_rqd = vrefresh;
424
425 /* 4. Find number of lines in Top margin: */
426 top_margin = 0;
427 if (margins)
428 top_margin = (vdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
429 1000;
430 /* 5. Find number of lines in bottom margin: */
431 bottom_margin = top_margin;
432
433 /* 6. If interlace is required, then set variable interlace: */
434 if (interlaced)
435 interlace = 1;
436 else
437 interlace = 0;
438
439 /* 7. Estimate the Horizontal frequency */
440 {
441 tmp1 = (1000000 - MIN_VSYNC_PLUS_BP * vfieldrate_rqd) / 500;
442 tmp2 = (vdisplay_rnd + 2 * top_margin + GTF_MIN_V_PORCH) *
443 2 + interlace;
444 hfreq_est = (tmp2 * 1000 * vfieldrate_rqd) / tmp1;
445 }
446
447 /* 8. Find the number of lines in V sync + back porch */
448 /* [V SYNC+BP] = RINT(([MIN VSYNC+BP] * hfreq_est / 1000000)) */
449 vsync_plus_bp = MIN_VSYNC_PLUS_BP * hfreq_est / 1000;
450 vsync_plus_bp = (vsync_plus_bp + 500) / 1000;
451 /* 9. Find the number of lines in V back porch alone: */
452 vback_porch = vsync_plus_bp - V_SYNC_RQD;
453 /* 10. Find the total number of lines in Vertical field period: */
454 vtotal_lines = vdisplay_rnd + top_margin + bottom_margin +
455 vsync_plus_bp + GTF_MIN_V_PORCH;
456 /* 11. Estimate the Vertical field frequency: */
457 vfieldrate_est = hfreq_est / vtotal_lines;
458 /* 12. Find the actual horizontal period: */
459 hperiod = 1000000 / (vfieldrate_rqd * vtotal_lines);
460
461 /* 13. Find the actual Vertical field frequency: */
462 vfield_rate = hfreq_est / vtotal_lines;
463 /* 14. Find the Vertical frame frequency: */
464 if (interlaced)
465 vframe_rate = vfield_rate / 2;
466 else
467 vframe_rate = vfield_rate;
468 /* 15. Find number of pixels in left margin: */
469 if (margins)
470 left_margin = (hdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
471 1000;
472 else
473 left_margin = 0;
474
475 /* 16.Find number of pixels in right margin: */
476 right_margin = left_margin;
477 /* 17.Find total number of active pixels in image and left and right */
478 total_active_pixels = hdisplay_rnd + left_margin + right_margin;
479 /* 18.Find the ideal blanking duty cycle from blanking duty cycle */
480 ideal_duty_cycle = GTF_C_PRIME * 1000 -
481 (GTF_M_PRIME * 1000000 / hfreq_est);
482 /* 19.Find the number of pixels in the blanking time to the nearest
483 * double character cell: */
484 hblank = total_active_pixels * ideal_duty_cycle /
485 (100000 - ideal_duty_cycle);
486 hblank = (hblank + GTF_CELL_GRAN) / (2 * GTF_CELL_GRAN);
487 hblank = hblank * 2 * GTF_CELL_GRAN;
488 /* 20.Find total number of pixels: */
489 total_pixels = total_active_pixels + hblank;
490 /* 21.Find pixel clock frequency: */
491 pixel_freq = total_pixels * hfreq_est / 1000;
492 /* Stage 1 computations are now complete; I should really pass
493 * the results to another function and do the Stage 2 computations,
494 * but I only need a few more values so I'll just append the
495 * computations here for now */
496 /* 17. Find the number of pixels in the horizontal sync period: */
497 hsync = H_SYNC_PERCENT * total_pixels / 100;
498 hsync = (hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
499 hsync = hsync * GTF_CELL_GRAN;
500 /* 18. Find the number of pixels in horizontal front porch period */
501 hfront_porch = hblank / 2 - hsync;
502 /* 36. Find the number of lines in the odd front porch period: */
503 vodd_front_porch_lines = GTF_MIN_V_PORCH ;
504
505 /* finally, pack the results in the mode struct */
506 drm_mode->hdisplay = hdisplay_rnd;
507 drm_mode->hsync_start = hdisplay_rnd + hfront_porch;
508 drm_mode->hsync_end = drm_mode->hsync_start + hsync;
509 drm_mode->htotal = total_pixels;
510 drm_mode->vdisplay = vdisplay_rnd;
511 drm_mode->vsync_start = vdisplay_rnd + vodd_front_porch_lines;
512 drm_mode->vsync_end = drm_mode->vsync_start + V_SYNC_RQD;
513 drm_mode->vtotal = vtotal_lines;
514
515 drm_mode->clock = pixel_freq;
516
517 if (interlaced) {
518 drm_mode->vtotal *= 2;
519 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
520 }
521
522 drm_mode_set_name(drm_mode);
523 if (GTF_M == 600 && GTF_2C == 80 && GTF_K == 128 && GTF_2J == 40)
524 drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;
525 else
526 drm_mode->flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC;
527
528 return drm_mode;
529 }
530 EXPORT_SYMBOL(drm_gtf_mode_complex);
531
532 /**
533 * drm_gtf_mode - create the modeline based on the GTF algorithm
534 * @dev: drm device
535 * @hdisplay: hdisplay size
536 * @vdisplay: vdisplay size
537 * @vrefresh: vrefresh rate.
538 * @interlaced: whether to compute an interlaced mode
539 * @margins: desired margin (borders) size
540 *
541 * return the modeline based on GTF algorithm
542 *
543 * This function is to create the modeline based on the GTF algorithm.
544 * Generalized Timing Formula is derived from:
545 *
546 * GTF Spreadsheet by Andy Morrish (1/5/97)
547 * available at http://www.vesa.org
548 *
549 * And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf.c.
550 * What I have done is to translate it by using integer calculation.
551 * I also refer to the function of fb_get_mode in the file of
552 * drivers/video/fbmon.c
553 *
554 * Standard GTF parameters::
555 *
556 * M = 600
557 * C = 40
558 * K = 128
559 * J = 20
560 *
561 * Returns:
562 * The modeline based on the GTF algorithm stored in a drm_display_mode object.
563 * The display mode object is allocated with drm_mode_create(). Returns NULL
564 * when no mode could be allocated.
565 */
566 struct drm_display_mode *
drm_gtf_mode(struct drm_device * dev,int hdisplay,int vdisplay,int vrefresh,bool interlaced,int margins)567 drm_gtf_mode(struct drm_device *dev, int hdisplay, int vdisplay, int vrefresh,
568 bool interlaced, int margins)
569 {
570 return drm_gtf_mode_complex(dev, hdisplay, vdisplay, vrefresh,
571 interlaced, margins,
572 600, 40 * 2, 128, 20 * 2);
573 }
574 EXPORT_SYMBOL(drm_gtf_mode);
575
576 #ifdef CONFIG_VIDEOMODE_HELPERS
577 /**
578 * drm_display_mode_from_videomode - fill in @dmode using @vm,
579 * @vm: videomode structure to use as source
580 * @dmode: drm_display_mode structure to use as destination
581 *
582 * Fills out @dmode using the display mode specified in @vm.
583 */
drm_display_mode_from_videomode(const struct videomode * vm,struct drm_display_mode * dmode)584 void drm_display_mode_from_videomode(const struct videomode *vm,
585 struct drm_display_mode *dmode)
586 {
587 dmode->hdisplay = vm->hactive;
588 dmode->hsync_start = dmode->hdisplay + vm->hfront_porch;
589 dmode->hsync_end = dmode->hsync_start + vm->hsync_len;
590 dmode->htotal = dmode->hsync_end + vm->hback_porch;
591
592 dmode->vdisplay = vm->vactive;
593 dmode->vsync_start = dmode->vdisplay + vm->vfront_porch;
594 dmode->vsync_end = dmode->vsync_start + vm->vsync_len;
595 dmode->vtotal = dmode->vsync_end + vm->vback_porch;
596
597 dmode->clock = vm->pixelclock / 1000;
598
599 dmode->flags = 0;
600 if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH)
601 dmode->flags |= DRM_MODE_FLAG_PHSYNC;
602 else if (vm->flags & DISPLAY_FLAGS_HSYNC_LOW)
603 dmode->flags |= DRM_MODE_FLAG_NHSYNC;
604 if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH)
605 dmode->flags |= DRM_MODE_FLAG_PVSYNC;
606 else if (vm->flags & DISPLAY_FLAGS_VSYNC_LOW)
607 dmode->flags |= DRM_MODE_FLAG_NVSYNC;
608 if (vm->flags & DISPLAY_FLAGS_INTERLACED)
609 dmode->flags |= DRM_MODE_FLAG_INTERLACE;
610 if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN)
611 dmode->flags |= DRM_MODE_FLAG_DBLSCAN;
612 if (vm->flags & DISPLAY_FLAGS_DOUBLECLK)
613 dmode->flags |= DRM_MODE_FLAG_DBLCLK;
614 drm_mode_set_name(dmode);
615 }
616 EXPORT_SYMBOL_GPL(drm_display_mode_from_videomode);
617
618 /**
619 * drm_display_mode_to_videomode - fill in @vm using @dmode,
620 * @dmode: drm_display_mode structure to use as source
621 * @vm: videomode structure to use as destination
622 *
623 * Fills out @vm using the display mode specified in @dmode.
624 */
drm_display_mode_to_videomode(const struct drm_display_mode * dmode,struct videomode * vm)625 void drm_display_mode_to_videomode(const struct drm_display_mode *dmode,
626 struct videomode *vm)
627 {
628 vm->hactive = dmode->hdisplay;
629 vm->hfront_porch = dmode->hsync_start - dmode->hdisplay;
630 vm->hsync_len = dmode->hsync_end - dmode->hsync_start;
631 vm->hback_porch = dmode->htotal - dmode->hsync_end;
632
633 vm->vactive = dmode->vdisplay;
634 vm->vfront_porch = dmode->vsync_start - dmode->vdisplay;
635 vm->vsync_len = dmode->vsync_end - dmode->vsync_start;
636 vm->vback_porch = dmode->vtotal - dmode->vsync_end;
637
638 vm->pixelclock = dmode->clock * 1000;
639
640 vm->flags = 0;
641 if (dmode->flags & DRM_MODE_FLAG_PHSYNC)
642 vm->flags |= DISPLAY_FLAGS_HSYNC_HIGH;
643 else if (dmode->flags & DRM_MODE_FLAG_NHSYNC)
644 vm->flags |= DISPLAY_FLAGS_HSYNC_LOW;
645 if (dmode->flags & DRM_MODE_FLAG_PVSYNC)
646 vm->flags |= DISPLAY_FLAGS_VSYNC_HIGH;
647 else if (dmode->flags & DRM_MODE_FLAG_NVSYNC)
648 vm->flags |= DISPLAY_FLAGS_VSYNC_LOW;
649 if (dmode->flags & DRM_MODE_FLAG_INTERLACE)
650 vm->flags |= DISPLAY_FLAGS_INTERLACED;
651 if (dmode->flags & DRM_MODE_FLAG_DBLSCAN)
652 vm->flags |= DISPLAY_FLAGS_DOUBLESCAN;
653 if (dmode->flags & DRM_MODE_FLAG_DBLCLK)
654 vm->flags |= DISPLAY_FLAGS_DOUBLECLK;
655 }
656 EXPORT_SYMBOL_GPL(drm_display_mode_to_videomode);
657
658 /**
659 * drm_bus_flags_from_videomode - extract information about pixelclk and
660 * DE polarity from videomode and store it in a separate variable
661 * @vm: videomode structure to use
662 * @bus_flags: information about pixelclk, sync and DE polarity will be stored
663 * here
664 *
665 * Sets DRM_BUS_FLAG_DE_(LOW|HIGH), DRM_BUS_FLAG_PIXDATA_(POS|NEG)EDGE and
666 * DISPLAY_FLAGS_SYNC_(POS|NEG)EDGE in @bus_flags according to DISPLAY_FLAGS
667 * found in @vm
668 */
drm_bus_flags_from_videomode(const struct videomode * vm,u32 * bus_flags)669 void drm_bus_flags_from_videomode(const struct videomode *vm, u32 *bus_flags)
670 {
671 *bus_flags = 0;
672 if (vm->flags & DISPLAY_FLAGS_PIXDATA_POSEDGE)
673 *bus_flags |= DRM_BUS_FLAG_PIXDATA_POSEDGE;
674 if (vm->flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
675 *bus_flags |= DRM_BUS_FLAG_PIXDATA_NEGEDGE;
676
677 if (vm->flags & DISPLAY_FLAGS_SYNC_POSEDGE)
678 *bus_flags |= DRM_BUS_FLAG_SYNC_POSEDGE;
679 if (vm->flags & DISPLAY_FLAGS_SYNC_NEGEDGE)
680 *bus_flags |= DRM_BUS_FLAG_SYNC_NEGEDGE;
681
682 if (vm->flags & DISPLAY_FLAGS_DE_LOW)
683 *bus_flags |= DRM_BUS_FLAG_DE_LOW;
684 if (vm->flags & DISPLAY_FLAGS_DE_HIGH)
685 *bus_flags |= DRM_BUS_FLAG_DE_HIGH;
686 }
687 EXPORT_SYMBOL_GPL(drm_bus_flags_from_videomode);
688
689 #ifdef CONFIG_OF
690 /**
691 * of_get_drm_display_mode - get a drm_display_mode from devicetree
692 * @np: device_node with the timing specification
693 * @dmode: will be set to the return value
694 * @bus_flags: information about pixelclk, sync and DE polarity
695 * @index: index into the list of display timings in devicetree
696 *
697 * This function is expensive and should only be used, if only one mode is to be
698 * read from DT. To get multiple modes start with of_get_display_timings and
699 * work with that instead.
700 *
701 * Returns:
702 * 0 on success, a negative errno code when no of videomode node was found.
703 */
of_get_drm_display_mode(struct device_node * np,struct drm_display_mode * dmode,u32 * bus_flags,int index)704 int of_get_drm_display_mode(struct device_node *np,
705 struct drm_display_mode *dmode, u32 *bus_flags,
706 int index)
707 {
708 struct videomode vm;
709 int ret;
710
711 ret = of_get_videomode(np, &vm, index);
712 if (ret)
713 return ret;
714
715 drm_display_mode_from_videomode(&vm, dmode);
716 if (bus_flags)
717 drm_bus_flags_from_videomode(&vm, bus_flags);
718
719 pr_debug("%pOF: got %dx%d display mode from %s\n",
720 np, vm.hactive, vm.vactive, np->name);
721 drm_mode_debug_printmodeline(dmode);
722
723 return 0;
724 }
725 EXPORT_SYMBOL_GPL(of_get_drm_display_mode);
726 #endif /* CONFIG_OF */
727 #endif /* CONFIG_VIDEOMODE_HELPERS */
728
729 /**
730 * drm_mode_set_name - set the name on a mode
731 * @mode: name will be set in this mode
732 *
733 * Set the name of @mode to a standard format which is <hdisplay>x<vdisplay>
734 * with an optional 'i' suffix for interlaced modes.
735 */
drm_mode_set_name(struct drm_display_mode * mode)736 void drm_mode_set_name(struct drm_display_mode *mode)
737 {
738 bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
739
740 snprintf(mode->name, DRM_DISPLAY_MODE_LEN, "%dx%d%s",
741 mode->hdisplay, mode->vdisplay,
742 interlaced ? "i" : "");
743 }
744 EXPORT_SYMBOL(drm_mode_set_name);
745
746 /**
747 * drm_mode_hsync - get the hsync of a mode
748 * @mode: mode
749 *
750 * Returns:
751 * @modes's hsync rate in kHz, rounded to the nearest integer. Calculates the
752 * value first if it is not yet set.
753 */
drm_mode_hsync(const struct drm_display_mode * mode)754 int drm_mode_hsync(const struct drm_display_mode *mode)
755 {
756 unsigned int calc_val;
757
758 if (mode->hsync)
759 return mode->hsync;
760
761 if (mode->htotal < 0)
762 return 0;
763
764 calc_val = (mode->clock * 1000) / mode->htotal; /* hsync in Hz */
765 calc_val += 500; /* round to 1000Hz */
766 calc_val /= 1000; /* truncate to kHz */
767
768 return calc_val;
769 }
770 EXPORT_SYMBOL(drm_mode_hsync);
771
772 /**
773 * drm_mode_vrefresh - get the vrefresh of a mode
774 * @mode: mode
775 *
776 * Returns:
777 * @modes's vrefresh rate in Hz, rounded to the nearest integer. Calculates the
778 * value first if it is not yet set.
779 */
drm_mode_vrefresh(const struct drm_display_mode * mode)780 int drm_mode_vrefresh(const struct drm_display_mode *mode)
781 {
782 int refresh = 0;
783
784 if (mode->vrefresh > 0)
785 refresh = mode->vrefresh;
786 else if (mode->htotal > 0 && mode->vtotal > 0) {
787 unsigned int num, den;
788
789 num = mode->clock * 1000;
790 den = mode->htotal * mode->vtotal;
791
792 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
793 num *= 2;
794 if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
795 den *= 2;
796 if (mode->vscan > 1)
797 den *= mode->vscan;
798
799 refresh = DIV_ROUND_CLOSEST(num, den);
800 }
801 return refresh;
802 }
803 EXPORT_SYMBOL(drm_mode_vrefresh);
804
805 /**
806 * drm_mode_get_hv_timing - Fetches hdisplay/vdisplay for given mode
807 * @mode: mode to query
808 * @hdisplay: hdisplay value to fill in
809 * @vdisplay: vdisplay value to fill in
810 *
811 * The vdisplay value will be doubled if the specified mode is a stereo mode of
812 * the appropriate layout.
813 */
drm_mode_get_hv_timing(const struct drm_display_mode * mode,int * hdisplay,int * vdisplay)814 void drm_mode_get_hv_timing(const struct drm_display_mode *mode,
815 int *hdisplay, int *vdisplay)
816 {
817 struct drm_display_mode adjusted = *mode;
818
819 drm_mode_set_crtcinfo(&adjusted, CRTC_STEREO_DOUBLE_ONLY);
820 *hdisplay = adjusted.crtc_hdisplay;
821 *vdisplay = adjusted.crtc_vdisplay;
822 }
823 EXPORT_SYMBOL(drm_mode_get_hv_timing);
824
825 /**
826 * drm_mode_set_crtcinfo - set CRTC modesetting timing parameters
827 * @p: mode
828 * @adjust_flags: a combination of adjustment flags
829 *
830 * Setup the CRTC modesetting timing parameters for @p, adjusting if necessary.
831 *
832 * - The CRTC_INTERLACE_HALVE_V flag can be used to halve vertical timings of
833 * interlaced modes.
834 * - The CRTC_STEREO_DOUBLE flag can be used to compute the timings for
835 * buffers containing two eyes (only adjust the timings when needed, eg. for
836 * "frame packing" or "side by side full").
837 * - The CRTC_NO_DBLSCAN and CRTC_NO_VSCAN flags request that adjustment *not*
838 * be performed for doublescan and vscan > 1 modes respectively.
839 */
drm_mode_set_crtcinfo(struct drm_display_mode * p,int adjust_flags)840 void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
841 {
842 if (!p)
843 return;
844
845 p->crtc_clock = p->clock;
846 p->crtc_hdisplay = p->hdisplay;
847 p->crtc_hsync_start = p->hsync_start;
848 p->crtc_hsync_end = p->hsync_end;
849 p->crtc_htotal = p->htotal;
850 p->crtc_hskew = p->hskew;
851 p->crtc_vdisplay = p->vdisplay;
852 p->crtc_vsync_start = p->vsync_start;
853 p->crtc_vsync_end = p->vsync_end;
854 p->crtc_vtotal = p->vtotal;
855
856 if (p->flags & DRM_MODE_FLAG_INTERLACE) {
857 if (adjust_flags & CRTC_INTERLACE_HALVE_V) {
858 p->crtc_vdisplay /= 2;
859 p->crtc_vsync_start /= 2;
860 p->crtc_vsync_end /= 2;
861 p->crtc_vtotal /= 2;
862 }
863 }
864
865 if (!(adjust_flags & CRTC_NO_DBLSCAN)) {
866 if (p->flags & DRM_MODE_FLAG_DBLSCAN) {
867 p->crtc_vdisplay *= 2;
868 p->crtc_vsync_start *= 2;
869 p->crtc_vsync_end *= 2;
870 p->crtc_vtotal *= 2;
871 }
872 }
873
874 if (!(adjust_flags & CRTC_NO_VSCAN)) {
875 if (p->vscan > 1) {
876 p->crtc_vdisplay *= p->vscan;
877 p->crtc_vsync_start *= p->vscan;
878 p->crtc_vsync_end *= p->vscan;
879 p->crtc_vtotal *= p->vscan;
880 }
881 }
882
883 if (adjust_flags & CRTC_STEREO_DOUBLE) {
884 unsigned int layout = p->flags & DRM_MODE_FLAG_3D_MASK;
885
886 switch (layout) {
887 case DRM_MODE_FLAG_3D_FRAME_PACKING:
888 p->crtc_clock *= 2;
889 p->crtc_vdisplay += p->crtc_vtotal;
890 p->crtc_vsync_start += p->crtc_vtotal;
891 p->crtc_vsync_end += p->crtc_vtotal;
892 p->crtc_vtotal += p->crtc_vtotal;
893 break;
894 }
895 }
896
897 p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
898 p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
899 p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);
900 p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);
901 }
902 EXPORT_SYMBOL(drm_mode_set_crtcinfo);
903
904 /**
905 * drm_mode_copy - copy the mode
906 * @dst: mode to overwrite
907 * @src: mode to copy
908 *
909 * Copy an existing mode into another mode, preserving the object id and
910 * list head of the destination mode.
911 */
drm_mode_copy(struct drm_display_mode * dst,const struct drm_display_mode * src)912 void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode *src)
913 {
914 int id = dst->base.id;
915 struct list_head head = dst->head;
916
917 *dst = *src;
918 dst->base.id = id;
919 dst->head = head;
920 }
921 EXPORT_SYMBOL(drm_mode_copy);
922
923 /**
924 * drm_mode_duplicate - allocate and duplicate an existing mode
925 * @dev: drm_device to allocate the duplicated mode for
926 * @mode: mode to duplicate
927 *
928 * Just allocate a new mode, copy the existing mode into it, and return
929 * a pointer to it. Used to create new instances of established modes.
930 *
931 * Returns:
932 * Pointer to duplicated mode on success, NULL on error.
933 */
drm_mode_duplicate(struct drm_device * dev,const struct drm_display_mode * mode)934 struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
935 const struct drm_display_mode *mode)
936 {
937 struct drm_display_mode *nmode;
938
939 nmode = drm_mode_create(dev);
940 if (!nmode)
941 return NULL;
942
943 drm_mode_copy(nmode, mode);
944
945 return nmode;
946 }
947 EXPORT_SYMBOL(drm_mode_duplicate);
948
drm_mode_match_timings(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)949 static bool drm_mode_match_timings(const struct drm_display_mode *mode1,
950 const struct drm_display_mode *mode2)
951 {
952 return mode1->hdisplay == mode2->hdisplay &&
953 mode1->hsync_start == mode2->hsync_start &&
954 mode1->hsync_end == mode2->hsync_end &&
955 mode1->htotal == mode2->htotal &&
956 mode1->hskew == mode2->hskew &&
957 mode1->vdisplay == mode2->vdisplay &&
958 mode1->vsync_start == mode2->vsync_start &&
959 mode1->vsync_end == mode2->vsync_end &&
960 mode1->vtotal == mode2->vtotal &&
961 mode1->vscan == mode2->vscan;
962 }
963
drm_mode_match_clock(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)964 static bool drm_mode_match_clock(const struct drm_display_mode *mode1,
965 const struct drm_display_mode *mode2)
966 {
967 /*
968 * do clock check convert to PICOS
969 * so fb modes get matched the same
970 */
971 if (mode1->clock && mode2->clock)
972 return KHZ2PICOS(mode1->clock) == KHZ2PICOS(mode2->clock);
973 else
974 return mode1->clock == mode2->clock;
975 }
976
drm_mode_match_flags(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)977 static bool drm_mode_match_flags(const struct drm_display_mode *mode1,
978 const struct drm_display_mode *mode2)
979 {
980 return (mode1->flags & ~DRM_MODE_FLAG_3D_MASK) ==
981 (mode2->flags & ~DRM_MODE_FLAG_3D_MASK);
982 }
983
drm_mode_match_3d_flags(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)984 static bool drm_mode_match_3d_flags(const struct drm_display_mode *mode1,
985 const struct drm_display_mode *mode2)
986 {
987 return (mode1->flags & DRM_MODE_FLAG_3D_MASK) ==
988 (mode2->flags & DRM_MODE_FLAG_3D_MASK);
989 }
990
drm_mode_match_aspect_ratio(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)991 static bool drm_mode_match_aspect_ratio(const struct drm_display_mode *mode1,
992 const struct drm_display_mode *mode2)
993 {
994 return mode1->picture_aspect_ratio == mode2->picture_aspect_ratio;
995 }
996
997 /**
998 * drm_mode_match - test modes for (partial) equality
999 * @mode1: first mode
1000 * @mode2: second mode
1001 * @match_flags: which parts need to match (DRM_MODE_MATCH_*)
1002 *
1003 * Check to see if @mode1 and @mode2 are equivalent.
1004 *
1005 * Returns:
1006 * True if the modes are (partially) equal, false otherwise.
1007 */
drm_mode_match(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2,unsigned int match_flags)1008 bool drm_mode_match(const struct drm_display_mode *mode1,
1009 const struct drm_display_mode *mode2,
1010 unsigned int match_flags)
1011 {
1012 if (!mode1 && !mode2)
1013 return true;
1014
1015 if (!mode1 || !mode2)
1016 return false;
1017
1018 if (match_flags & DRM_MODE_MATCH_TIMINGS &&
1019 !drm_mode_match_timings(mode1, mode2))
1020 return false;
1021
1022 if (match_flags & DRM_MODE_MATCH_CLOCK &&
1023 !drm_mode_match_clock(mode1, mode2))
1024 return false;
1025
1026 if (match_flags & DRM_MODE_MATCH_FLAGS &&
1027 !drm_mode_match_flags(mode1, mode2))
1028 return false;
1029
1030 if (match_flags & DRM_MODE_MATCH_3D_FLAGS &&
1031 !drm_mode_match_3d_flags(mode1, mode2))
1032 return false;
1033
1034 if (match_flags & DRM_MODE_MATCH_ASPECT_RATIO &&
1035 !drm_mode_match_aspect_ratio(mode1, mode2))
1036 return false;
1037
1038 return true;
1039 }
1040 EXPORT_SYMBOL(drm_mode_match);
1041
1042 /**
1043 * drm_mode_equal - test modes for equality
1044 * @mode1: first mode
1045 * @mode2: second mode
1046 *
1047 * Check to see if @mode1 and @mode2 are equivalent.
1048 *
1049 * Returns:
1050 * True if the modes are equal, false otherwise.
1051 */
drm_mode_equal(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1052 bool drm_mode_equal(const struct drm_display_mode *mode1,
1053 const struct drm_display_mode *mode2)
1054 {
1055 return drm_mode_match(mode1, mode2,
1056 DRM_MODE_MATCH_TIMINGS |
1057 DRM_MODE_MATCH_CLOCK |
1058 DRM_MODE_MATCH_FLAGS |
1059 DRM_MODE_MATCH_3D_FLAGS|
1060 DRM_MODE_MATCH_ASPECT_RATIO);
1061 }
1062 EXPORT_SYMBOL(drm_mode_equal);
1063
1064 /**
1065 * drm_mode_equal_no_clocks - test modes for equality
1066 * @mode1: first mode
1067 * @mode2: second mode
1068 *
1069 * Check to see if @mode1 and @mode2 are equivalent, but
1070 * don't check the pixel clocks.
1071 *
1072 * Returns:
1073 * True if the modes are equal, false otherwise.
1074 */
drm_mode_equal_no_clocks(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1075 bool drm_mode_equal_no_clocks(const struct drm_display_mode *mode1,
1076 const struct drm_display_mode *mode2)
1077 {
1078 return drm_mode_match(mode1, mode2,
1079 DRM_MODE_MATCH_TIMINGS |
1080 DRM_MODE_MATCH_FLAGS |
1081 DRM_MODE_MATCH_3D_FLAGS);
1082 }
1083 EXPORT_SYMBOL(drm_mode_equal_no_clocks);
1084
1085 /**
1086 * drm_mode_equal_no_clocks_no_stereo - test modes for equality
1087 * @mode1: first mode
1088 * @mode2: second mode
1089 *
1090 * Check to see if @mode1 and @mode2 are equivalent, but
1091 * don't check the pixel clocks nor the stereo layout.
1092 *
1093 * Returns:
1094 * True if the modes are equal, false otherwise.
1095 */
drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1096 bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1,
1097 const struct drm_display_mode *mode2)
1098 {
1099 return drm_mode_match(mode1, mode2,
1100 DRM_MODE_MATCH_TIMINGS |
1101 DRM_MODE_MATCH_FLAGS);
1102 }
1103 EXPORT_SYMBOL(drm_mode_equal_no_clocks_no_stereo);
1104
1105 static enum drm_mode_status
drm_mode_validate_basic(const struct drm_display_mode * mode)1106 drm_mode_validate_basic(const struct drm_display_mode *mode)
1107 {
1108 if (mode->type & ~DRM_MODE_TYPE_ALL)
1109 return MODE_BAD;
1110
1111 if (mode->flags & ~DRM_MODE_FLAG_ALL)
1112 return MODE_BAD;
1113
1114 if ((mode->flags & DRM_MODE_FLAG_3D_MASK) > DRM_MODE_FLAG_3D_MAX)
1115 return MODE_BAD;
1116
1117 if (mode->clock == 0)
1118 return MODE_CLOCK_LOW;
1119
1120 if (mode->hdisplay == 0 ||
1121 mode->hsync_start < mode->hdisplay ||
1122 mode->hsync_end < mode->hsync_start ||
1123 mode->htotal < mode->hsync_end)
1124 return MODE_H_ILLEGAL;
1125
1126 if (mode->vdisplay == 0 ||
1127 mode->vsync_start < mode->vdisplay ||
1128 mode->vsync_end < mode->vsync_start ||
1129 mode->vtotal < mode->vsync_end)
1130 return MODE_V_ILLEGAL;
1131
1132 return MODE_OK;
1133 }
1134
1135 /**
1136 * drm_mode_validate_driver - make sure the mode is somewhat sane
1137 * @dev: drm device
1138 * @mode: mode to check
1139 *
1140 * First do basic validation on the mode, and then allow the driver
1141 * to check for device/driver specific limitations via the optional
1142 * &drm_mode_config_helper_funcs.mode_valid hook.
1143 *
1144 * Returns:
1145 * The mode status
1146 */
1147 enum drm_mode_status
drm_mode_validate_driver(struct drm_device * dev,const struct drm_display_mode * mode)1148 drm_mode_validate_driver(struct drm_device *dev,
1149 const struct drm_display_mode *mode)
1150 {
1151 enum drm_mode_status status;
1152
1153 status = drm_mode_validate_basic(mode);
1154 if (status != MODE_OK)
1155 return status;
1156
1157 if (dev->mode_config.funcs->mode_valid)
1158 return dev->mode_config.funcs->mode_valid(dev, mode);
1159 else
1160 return MODE_OK;
1161 }
1162 EXPORT_SYMBOL(drm_mode_validate_driver);
1163
1164 /**
1165 * drm_mode_validate_size - make sure modes adhere to size constraints
1166 * @mode: mode to check
1167 * @maxX: maximum width
1168 * @maxY: maximum height
1169 *
1170 * This function is a helper which can be used to validate modes against size
1171 * limitations of the DRM device/connector. If a mode is too big its status
1172 * member is updated with the appropriate validation failure code. The list
1173 * itself is not changed.
1174 *
1175 * Returns:
1176 * The mode status
1177 */
1178 enum drm_mode_status
drm_mode_validate_size(const struct drm_display_mode * mode,int maxX,int maxY)1179 drm_mode_validate_size(const struct drm_display_mode *mode,
1180 int maxX, int maxY)
1181 {
1182 if (maxX > 0 && mode->hdisplay > maxX)
1183 return MODE_VIRTUAL_X;
1184
1185 if (maxY > 0 && mode->vdisplay > maxY)
1186 return MODE_VIRTUAL_Y;
1187
1188 return MODE_OK;
1189 }
1190 EXPORT_SYMBOL(drm_mode_validate_size);
1191
1192 /**
1193 * drm_mode_validate_ycbcr420 - add 'ycbcr420-only' modes only when allowed
1194 * @mode: mode to check
1195 * @connector: drm connector under action
1196 *
1197 * This function is a helper which can be used to filter out any YCBCR420
1198 * only mode, when the source doesn't support it.
1199 *
1200 * Returns:
1201 * The mode status
1202 */
1203 enum drm_mode_status
drm_mode_validate_ycbcr420(const struct drm_display_mode * mode,struct drm_connector * connector)1204 drm_mode_validate_ycbcr420(const struct drm_display_mode *mode,
1205 struct drm_connector *connector)
1206 {
1207 u8 vic = drm_match_cea_mode(mode);
1208 enum drm_mode_status status = MODE_OK;
1209 struct drm_hdmi_info *hdmi = &connector->display_info.hdmi;
1210
1211 if (test_bit(vic, hdmi->y420_vdb_modes)) {
1212 if (!connector->ycbcr_420_allowed)
1213 status = MODE_NO_420;
1214 }
1215
1216 return status;
1217 }
1218 EXPORT_SYMBOL(drm_mode_validate_ycbcr420);
1219
1220 #define MODE_STATUS(status) [MODE_ ## status + 3] = #status
1221
1222 static const char * const drm_mode_status_names[] = {
1223 MODE_STATUS(OK),
1224 MODE_STATUS(HSYNC),
1225 MODE_STATUS(VSYNC),
1226 MODE_STATUS(H_ILLEGAL),
1227 MODE_STATUS(V_ILLEGAL),
1228 MODE_STATUS(BAD_WIDTH),
1229 MODE_STATUS(NOMODE),
1230 MODE_STATUS(NO_INTERLACE),
1231 MODE_STATUS(NO_DBLESCAN),
1232 MODE_STATUS(NO_VSCAN),
1233 MODE_STATUS(MEM),
1234 MODE_STATUS(VIRTUAL_X),
1235 MODE_STATUS(VIRTUAL_Y),
1236 MODE_STATUS(MEM_VIRT),
1237 MODE_STATUS(NOCLOCK),
1238 MODE_STATUS(CLOCK_HIGH),
1239 MODE_STATUS(CLOCK_LOW),
1240 MODE_STATUS(CLOCK_RANGE),
1241 MODE_STATUS(BAD_HVALUE),
1242 MODE_STATUS(BAD_VVALUE),
1243 MODE_STATUS(BAD_VSCAN),
1244 MODE_STATUS(HSYNC_NARROW),
1245 MODE_STATUS(HSYNC_WIDE),
1246 MODE_STATUS(HBLANK_NARROW),
1247 MODE_STATUS(HBLANK_WIDE),
1248 MODE_STATUS(VSYNC_NARROW),
1249 MODE_STATUS(VSYNC_WIDE),
1250 MODE_STATUS(VBLANK_NARROW),
1251 MODE_STATUS(VBLANK_WIDE),
1252 MODE_STATUS(PANEL),
1253 MODE_STATUS(INTERLACE_WIDTH),
1254 MODE_STATUS(ONE_WIDTH),
1255 MODE_STATUS(ONE_HEIGHT),
1256 MODE_STATUS(ONE_SIZE),
1257 MODE_STATUS(NO_REDUCED),
1258 MODE_STATUS(NO_STEREO),
1259 MODE_STATUS(NO_420),
1260 MODE_STATUS(STALE),
1261 MODE_STATUS(BAD),
1262 MODE_STATUS(ERROR),
1263 };
1264
1265 #undef MODE_STATUS
1266
drm_get_mode_status_name(enum drm_mode_status status)1267 const char *drm_get_mode_status_name(enum drm_mode_status status)
1268 {
1269 int index = status + 3;
1270
1271 if (WARN_ON(index < 0 || index >= ARRAY_SIZE(drm_mode_status_names)))
1272 return "";
1273
1274 return drm_mode_status_names[index];
1275 }
1276
1277 /**
1278 * drm_mode_prune_invalid - remove invalid modes from mode list
1279 * @dev: DRM device
1280 * @mode_list: list of modes to check
1281 * @verbose: be verbose about it
1282 *
1283 * This helper function can be used to prune a display mode list after
1284 * validation has been completed. All modes who's status is not MODE_OK will be
1285 * removed from the list, and if @verbose the status code and mode name is also
1286 * printed to dmesg.
1287 */
drm_mode_prune_invalid(struct drm_device * dev,struct list_head * mode_list,bool verbose)1288 void drm_mode_prune_invalid(struct drm_device *dev,
1289 struct list_head *mode_list, bool verbose)
1290 {
1291 struct drm_display_mode *mode, *t;
1292
1293 list_for_each_entry_safe(mode, t, mode_list, head) {
1294 if (mode->status != MODE_OK) {
1295 list_del(&mode->head);
1296 if (verbose) {
1297 drm_mode_debug_printmodeline(mode);
1298 DRM_DEBUG_KMS("Not using %s mode: %s\n",
1299 mode->name,
1300 drm_get_mode_status_name(mode->status));
1301 }
1302 drm_mode_destroy(dev, mode);
1303 }
1304 }
1305 }
1306 EXPORT_SYMBOL(drm_mode_prune_invalid);
1307
1308 /**
1309 * drm_mode_compare - compare modes for favorability
1310 * @priv: unused
1311 * @lh_a: list_head for first mode
1312 * @lh_b: list_head for second mode
1313 *
1314 * Compare two modes, given by @lh_a and @lh_b, returning a value indicating
1315 * which is better.
1316 *
1317 * Returns:
1318 * Negative if @lh_a is better than @lh_b, zero if they're equivalent, or
1319 * positive if @lh_b is better than @lh_a.
1320 */
drm_mode_compare(void * priv,struct list_head * lh_a,struct list_head * lh_b)1321 static int drm_mode_compare(void *priv, struct list_head *lh_a, struct list_head *lh_b)
1322 {
1323 struct drm_display_mode *a = list_entry(lh_a, struct drm_display_mode, head);
1324 struct drm_display_mode *b = list_entry(lh_b, struct drm_display_mode, head);
1325 int diff;
1326
1327 diff = ((b->type & DRM_MODE_TYPE_PREFERRED) != 0) -
1328 ((a->type & DRM_MODE_TYPE_PREFERRED) != 0);
1329 if (diff)
1330 return diff;
1331 diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay;
1332 if (diff)
1333 return diff;
1334
1335 diff = b->vrefresh - a->vrefresh;
1336 if (diff)
1337 return diff;
1338
1339 diff = b->clock - a->clock;
1340 return diff;
1341 }
1342
1343 /**
1344 * drm_mode_sort - sort mode list
1345 * @mode_list: list of drm_display_mode structures to sort
1346 *
1347 * Sort @mode_list by favorability, moving good modes to the head of the list.
1348 */
drm_mode_sort(struct list_head * mode_list)1349 void drm_mode_sort(struct list_head *mode_list)
1350 {
1351 list_sort(NULL, mode_list, drm_mode_compare);
1352 }
1353 EXPORT_SYMBOL(drm_mode_sort);
1354
1355 /**
1356 * drm_connector_list_update - update the mode list for the connector
1357 * @connector: the connector to update
1358 *
1359 * This moves the modes from the @connector probed_modes list
1360 * to the actual mode list. It compares the probed mode against the current
1361 * list and only adds different/new modes.
1362 *
1363 * This is just a helper functions doesn't validate any modes itself and also
1364 * doesn't prune any invalid modes. Callers need to do that themselves.
1365 */
drm_connector_list_update(struct drm_connector * connector)1366 void drm_connector_list_update(struct drm_connector *connector)
1367 {
1368 struct drm_display_mode *pmode, *pt;
1369
1370 WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
1371
1372 list_for_each_entry_safe(pmode, pt, &connector->probed_modes, head) {
1373 struct drm_display_mode *mode;
1374 bool found_it = false;
1375
1376 /* go through current modes checking for the new probed mode */
1377 list_for_each_entry(mode, &connector->modes, head) {
1378 if (!drm_mode_equal(pmode, mode))
1379 continue;
1380
1381 found_it = true;
1382
1383 /*
1384 * If the old matching mode is stale (ie. left over
1385 * from a previous probe) just replace it outright.
1386 * Otherwise just merge the type bits between all
1387 * equal probed modes.
1388 *
1389 * If two probed modes are considered equal, pick the
1390 * actual timings from the one that's marked as
1391 * preferred (in case the match isn't 100%). If
1392 * multiple or zero preferred modes are present, favor
1393 * the mode added to the probed_modes list first.
1394 */
1395 if (mode->status == MODE_STALE) {
1396 drm_mode_copy(mode, pmode);
1397 } else if ((mode->type & DRM_MODE_TYPE_PREFERRED) == 0 &&
1398 (pmode->type & DRM_MODE_TYPE_PREFERRED) != 0) {
1399 pmode->type |= mode->type;
1400 drm_mode_copy(mode, pmode);
1401 } else {
1402 mode->type |= pmode->type;
1403 }
1404
1405 list_del(&pmode->head);
1406 drm_mode_destroy(connector->dev, pmode);
1407 break;
1408 }
1409
1410 if (!found_it) {
1411 list_move_tail(&pmode->head, &connector->modes);
1412 }
1413 }
1414 }
1415 EXPORT_SYMBOL(drm_connector_list_update);
1416
1417 /**
1418 * drm_mode_parse_command_line_for_connector - parse command line modeline for connector
1419 * @mode_option: optional per connector mode option
1420 * @connector: connector to parse modeline for
1421 * @mode: preallocated drm_cmdline_mode structure to fill out
1422 *
1423 * This parses @mode_option command line modeline for modes and options to
1424 * configure the connector. If @mode_option is NULL the default command line
1425 * modeline in fb_mode_option will be parsed instead.
1426 *
1427 * This uses the same parameters as the fb modedb.c, except for an extra
1428 * force-enable, force-enable-digital and force-disable bit at the end::
1429 *
1430 * <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
1431 *
1432 * The intermediate drm_cmdline_mode structure is required to store additional
1433 * options from the command line modline like the force-enable/disable flag.
1434 *
1435 * Returns:
1436 * True if a valid modeline has been parsed, false otherwise.
1437 */
drm_mode_parse_command_line_for_connector(const char * mode_option,struct drm_connector * connector,struct drm_cmdline_mode * mode)1438 bool drm_mode_parse_command_line_for_connector(const char *mode_option,
1439 struct drm_connector *connector,
1440 struct drm_cmdline_mode *mode)
1441 {
1442 const char *name;
1443 unsigned int namelen;
1444 bool res_specified = false, bpp_specified = false, refresh_specified = false;
1445 unsigned int xres = 0, yres = 0, bpp = 32, refresh = 0;
1446 bool yres_specified = false, cvt = false, rb = false;
1447 bool interlace = false, margins = false, was_digit = false;
1448 int i;
1449 enum drm_connector_force force = DRM_FORCE_UNSPECIFIED;
1450
1451 #ifdef CONFIG_FB
1452 if (!mode_option)
1453 mode_option = fb_mode_option;
1454 #endif
1455
1456 if (!mode_option) {
1457 mode->specified = false;
1458 return false;
1459 }
1460
1461 name = mode_option;
1462 namelen = strlen(name);
1463 for (i = namelen-1; i >= 0; i--) {
1464 switch (name[i]) {
1465 case '@':
1466 if (!refresh_specified && !bpp_specified &&
1467 !yres_specified && !cvt && !rb && was_digit) {
1468 refresh = simple_strtol(&name[i+1], NULL, 10);
1469 refresh_specified = true;
1470 was_digit = false;
1471 } else
1472 goto done;
1473 break;
1474 case '-':
1475 if (!bpp_specified && !yres_specified && !cvt &&
1476 !rb && was_digit) {
1477 bpp = simple_strtol(&name[i+1], NULL, 10);
1478 bpp_specified = true;
1479 was_digit = false;
1480 } else
1481 goto done;
1482 break;
1483 case 'x':
1484 if (!yres_specified && was_digit) {
1485 yres = simple_strtol(&name[i+1], NULL, 10);
1486 yres_specified = true;
1487 was_digit = false;
1488 } else
1489 goto done;
1490 break;
1491 case '0' ... '9':
1492 was_digit = true;
1493 break;
1494 case 'M':
1495 if (yres_specified || cvt || was_digit)
1496 goto done;
1497 cvt = true;
1498 break;
1499 case 'R':
1500 if (yres_specified || cvt || rb || was_digit)
1501 goto done;
1502 rb = true;
1503 break;
1504 case 'm':
1505 if (cvt || yres_specified || was_digit)
1506 goto done;
1507 margins = true;
1508 break;
1509 case 'i':
1510 if (cvt || yres_specified || was_digit)
1511 goto done;
1512 interlace = true;
1513 break;
1514 case 'e':
1515 if (yres_specified || bpp_specified || refresh_specified ||
1516 was_digit || (force != DRM_FORCE_UNSPECIFIED))
1517 goto done;
1518
1519 force = DRM_FORCE_ON;
1520 break;
1521 case 'D':
1522 if (yres_specified || bpp_specified || refresh_specified ||
1523 was_digit || (force != DRM_FORCE_UNSPECIFIED))
1524 goto done;
1525
1526 if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
1527 (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
1528 force = DRM_FORCE_ON;
1529 else
1530 force = DRM_FORCE_ON_DIGITAL;
1531 break;
1532 case 'd':
1533 if (yres_specified || bpp_specified || refresh_specified ||
1534 was_digit || (force != DRM_FORCE_UNSPECIFIED))
1535 goto done;
1536
1537 force = DRM_FORCE_OFF;
1538 break;
1539 default:
1540 goto done;
1541 }
1542 }
1543
1544 if (i < 0 && yres_specified) {
1545 char *ch;
1546 xres = simple_strtol(name, &ch, 10);
1547 if ((ch != NULL) && (*ch == 'x'))
1548 res_specified = true;
1549 else
1550 i = ch - name;
1551 } else if (!yres_specified && was_digit) {
1552 /* catch mode that begins with digits but has no 'x' */
1553 i = 0;
1554 }
1555 done:
1556 if (i >= 0) {
1557 pr_warn("[drm] parse error at position %i in video mode '%s'\n",
1558 i, name);
1559 mode->specified = false;
1560 return false;
1561 }
1562
1563 if (res_specified) {
1564 mode->specified = true;
1565 mode->xres = xres;
1566 mode->yres = yres;
1567 }
1568
1569 if (refresh_specified) {
1570 mode->refresh_specified = true;
1571 mode->refresh = refresh;
1572 }
1573
1574 if (bpp_specified) {
1575 mode->bpp_specified = true;
1576 mode->bpp = bpp;
1577 }
1578 mode->rb = rb;
1579 mode->cvt = cvt;
1580 mode->interlace = interlace;
1581 mode->margins = margins;
1582 mode->force = force;
1583
1584 return true;
1585 }
1586 EXPORT_SYMBOL(drm_mode_parse_command_line_for_connector);
1587
1588 /**
1589 * drm_mode_create_from_cmdline_mode - convert a command line modeline into a DRM display mode
1590 * @dev: DRM device to create the new mode for
1591 * @cmd: input command line modeline
1592 *
1593 * Returns:
1594 * Pointer to converted mode on success, NULL on error.
1595 */
1596 struct drm_display_mode *
drm_mode_create_from_cmdline_mode(struct drm_device * dev,struct drm_cmdline_mode * cmd)1597 drm_mode_create_from_cmdline_mode(struct drm_device *dev,
1598 struct drm_cmdline_mode *cmd)
1599 {
1600 struct drm_display_mode *mode;
1601
1602 if (cmd->cvt)
1603 mode = drm_cvt_mode(dev,
1604 cmd->xres, cmd->yres,
1605 cmd->refresh_specified ? cmd->refresh : 60,
1606 cmd->rb, cmd->interlace,
1607 cmd->margins);
1608 else
1609 mode = drm_gtf_mode(dev,
1610 cmd->xres, cmd->yres,
1611 cmd->refresh_specified ? cmd->refresh : 60,
1612 cmd->interlace,
1613 cmd->margins);
1614 if (!mode)
1615 return NULL;
1616
1617 mode->type |= DRM_MODE_TYPE_USERDEF;
1618 /* fix up 1368x768: GFT/CVT can't express 1366 width due to alignment */
1619 if (cmd->xres == 1366)
1620 drm_mode_fixup_1366x768(mode);
1621 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
1622 return mode;
1623 }
1624 EXPORT_SYMBOL(drm_mode_create_from_cmdline_mode);
1625
1626 /**
1627 * drm_crtc_convert_to_umode - convert a drm_display_mode into a modeinfo
1628 * @out: drm_mode_modeinfo struct to return to the user
1629 * @in: drm_display_mode to use
1630 *
1631 * Convert a drm_display_mode into a drm_mode_modeinfo structure to return to
1632 * the user.
1633 */
drm_mode_convert_to_umode(struct drm_mode_modeinfo * out,const struct drm_display_mode * in)1634 void drm_mode_convert_to_umode(struct drm_mode_modeinfo *out,
1635 const struct drm_display_mode *in)
1636 {
1637 WARN(in->hdisplay > USHRT_MAX || in->hsync_start > USHRT_MAX ||
1638 in->hsync_end > USHRT_MAX || in->htotal > USHRT_MAX ||
1639 in->hskew > USHRT_MAX || in->vdisplay > USHRT_MAX ||
1640 in->vsync_start > USHRT_MAX || in->vsync_end > USHRT_MAX ||
1641 in->vtotal > USHRT_MAX || in->vscan > USHRT_MAX,
1642 "timing values too large for mode info\n");
1643
1644 out->clock = in->clock;
1645 out->hdisplay = in->hdisplay;
1646 out->hsync_start = in->hsync_start;
1647 out->hsync_end = in->hsync_end;
1648 out->htotal = in->htotal;
1649 out->hskew = in->hskew;
1650 out->vdisplay = in->vdisplay;
1651 out->vsync_start = in->vsync_start;
1652 out->vsync_end = in->vsync_end;
1653 out->vtotal = in->vtotal;
1654 out->vscan = in->vscan;
1655 out->vrefresh = in->vrefresh;
1656 out->flags = in->flags;
1657 out->type = in->type;
1658
1659 switch (in->picture_aspect_ratio) {
1660 case HDMI_PICTURE_ASPECT_4_3:
1661 out->flags |= DRM_MODE_FLAG_PIC_AR_4_3;
1662 break;
1663 case HDMI_PICTURE_ASPECT_16_9:
1664 out->flags |= DRM_MODE_FLAG_PIC_AR_16_9;
1665 break;
1666 case HDMI_PICTURE_ASPECT_64_27:
1667 out->flags |= DRM_MODE_FLAG_PIC_AR_64_27;
1668 break;
1669 case HDMI_PICTURE_ASPECT_256_135:
1670 out->flags |= DRM_MODE_FLAG_PIC_AR_256_135;
1671 break;
1672 case HDMI_PICTURE_ASPECT_RESERVED:
1673 default:
1674 out->flags |= DRM_MODE_FLAG_PIC_AR_NONE;
1675 break;
1676 }
1677
1678 strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
1679 out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
1680 }
1681
1682 /**
1683 * drm_crtc_convert_umode - convert a modeinfo into a drm_display_mode
1684 * @dev: drm device
1685 * @out: drm_display_mode to return to the user
1686 * @in: drm_mode_modeinfo to use
1687 *
1688 * Convert a drm_mode_modeinfo into a drm_display_mode structure to return to
1689 * the caller.
1690 *
1691 * Returns:
1692 * Zero on success, negative errno on failure.
1693 */
drm_mode_convert_umode(struct drm_device * dev,struct drm_display_mode * out,const struct drm_mode_modeinfo * in)1694 int drm_mode_convert_umode(struct drm_device *dev,
1695 struct drm_display_mode *out,
1696 const struct drm_mode_modeinfo *in)
1697 {
1698 if (in->clock > INT_MAX || in->vrefresh > INT_MAX)
1699 return -ERANGE;
1700
1701 out->clock = in->clock;
1702 out->hdisplay = in->hdisplay;
1703 out->hsync_start = in->hsync_start;
1704 out->hsync_end = in->hsync_end;
1705 out->htotal = in->htotal;
1706 out->hskew = in->hskew;
1707 out->vdisplay = in->vdisplay;
1708 out->vsync_start = in->vsync_start;
1709 out->vsync_end = in->vsync_end;
1710 out->vtotal = in->vtotal;
1711 out->vscan = in->vscan;
1712 out->vrefresh = in->vrefresh;
1713 out->flags = in->flags;
1714 /*
1715 * Old xf86-video-vmware (possibly others too) used to
1716 * leave 'type' unititialized. Just ignore any bits we
1717 * don't like. It's a just hint after all, and more
1718 * useful for the kernel->userspace direction anyway.
1719 */
1720 out->type = in->type & DRM_MODE_TYPE_ALL;
1721 strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
1722 out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
1723
1724 /* Clearing picture aspect ratio bits from out flags,
1725 * as the aspect-ratio information is not stored in
1726 * flags for kernel-mode, but in picture_aspect_ratio.
1727 */
1728 out->flags &= ~DRM_MODE_FLAG_PIC_AR_MASK;
1729
1730 switch (in->flags & DRM_MODE_FLAG_PIC_AR_MASK) {
1731 case DRM_MODE_FLAG_PIC_AR_4_3:
1732 out->picture_aspect_ratio |= HDMI_PICTURE_ASPECT_4_3;
1733 break;
1734 case DRM_MODE_FLAG_PIC_AR_16_9:
1735 out->picture_aspect_ratio |= HDMI_PICTURE_ASPECT_16_9;
1736 break;
1737 case DRM_MODE_FLAG_PIC_AR_64_27:
1738 out->picture_aspect_ratio |= HDMI_PICTURE_ASPECT_64_27;
1739 break;
1740 case DRM_MODE_FLAG_PIC_AR_256_135:
1741 out->picture_aspect_ratio |= HDMI_PICTURE_ASPECT_256_135;
1742 break;
1743 default:
1744 out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_NONE;
1745 break;
1746 }
1747
1748 out->status = drm_mode_validate_driver(dev, out);
1749 if (out->status != MODE_OK)
1750 return -EINVAL;
1751
1752 drm_mode_set_crtcinfo(out, CRTC_INTERLACE_HALVE_V);
1753
1754 return 0;
1755 }
1756
1757 /**
1758 * drm_mode_is_420_only - if a given videomode can be only supported in YCBCR420
1759 * output format
1760 *
1761 * @display: display under action
1762 * @mode: video mode to be tested.
1763 *
1764 * Returns:
1765 * true if the mode can be supported in YCBCR420 format
1766 * false if not.
1767 */
drm_mode_is_420_only(const struct drm_display_info * display,const struct drm_display_mode * mode)1768 bool drm_mode_is_420_only(const struct drm_display_info *display,
1769 const struct drm_display_mode *mode)
1770 {
1771 u8 vic = drm_match_cea_mode(mode);
1772
1773 return test_bit(vic, display->hdmi.y420_vdb_modes);
1774 }
1775 EXPORT_SYMBOL(drm_mode_is_420_only);
1776
1777 /**
1778 * drm_mode_is_420_also - if a given videomode can be supported in YCBCR420
1779 * output format also (along with RGB/YCBCR444/422)
1780 *
1781 * @display: display under action.
1782 * @mode: video mode to be tested.
1783 *
1784 * Returns:
1785 * true if the mode can be support YCBCR420 format
1786 * false if not.
1787 */
drm_mode_is_420_also(const struct drm_display_info * display,const struct drm_display_mode * mode)1788 bool drm_mode_is_420_also(const struct drm_display_info *display,
1789 const struct drm_display_mode *mode)
1790 {
1791 u8 vic = drm_match_cea_mode(mode);
1792
1793 return test_bit(vic, display->hdmi.y420_cmdb_modes);
1794 }
1795 EXPORT_SYMBOL(drm_mode_is_420_also);
1796 /**
1797 * drm_mode_is_420 - if a given videomode can be supported in YCBCR420
1798 * output format
1799 *
1800 * @display: display under action.
1801 * @mode: video mode to be tested.
1802 *
1803 * Returns:
1804 * true if the mode can be supported in YCBCR420 format
1805 * false if not.
1806 */
drm_mode_is_420(const struct drm_display_info * display,const struct drm_display_mode * mode)1807 bool drm_mode_is_420(const struct drm_display_info *display,
1808 const struct drm_display_mode *mode)
1809 {
1810 return drm_mode_is_420_only(display, mode) ||
1811 drm_mode_is_420_also(display, mode);
1812 }
1813 EXPORT_SYMBOL(drm_mode_is_420);
1814