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/ctype.h>
34 #include <linux/list.h>
35 #include <linux/list_sort.h>
36 #include <linux/export.h>
37
38 #include <video/of_videomode.h>
39 #include <video/videomode.h>
40
41 #include <drm/drm_crtc.h>
42 #include <drm/drm_device.h>
43 #include <drm/drm_modes.h>
44 #include <drm/drm_print.h>
45
46 #include "drm_crtc_internal.h"
47
48 /**
49 * drm_mode_debug_printmodeline - print a mode to dmesg
50 * @mode: mode to print
51 *
52 * Describe @mode using DRM_DEBUG.
53 */
drm_mode_debug_printmodeline(const struct drm_display_mode * mode)54 void drm_mode_debug_printmodeline(const struct drm_display_mode *mode)
55 {
56 DRM_DEBUG_KMS("Modeline " DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
57 }
58 EXPORT_SYMBOL(drm_mode_debug_printmodeline);
59
60 /**
61 * drm_mode_create - create a new display mode
62 * @dev: DRM device
63 *
64 * Create a new, cleared drm_display_mode with kzalloc, allocate an ID for it
65 * and return it.
66 *
67 * Returns:
68 * Pointer to new mode on success, NULL on error.
69 */
drm_mode_create(struct drm_device * dev)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 return nmode;
79 }
80 EXPORT_SYMBOL(drm_mode_create);
81
82 /**
83 * drm_mode_destroy - remove a mode
84 * @dev: DRM device
85 * @mode: mode to remove
86 *
87 * Release @mode's unique ID, then free it @mode structure itself using kfree.
88 */
drm_mode_destroy(struct drm_device * dev,struct drm_display_mode * mode)89 void drm_mode_destroy(struct drm_device *dev, struct drm_display_mode *mode)
90 {
91 if (!mode)
92 return;
93
94 kfree(mode);
95 }
96 EXPORT_SYMBOL(drm_mode_destroy);
97
98 /**
99 * drm_mode_probed_add - add a mode to a connector's probed_mode list
100 * @connector: connector the new mode
101 * @mode: mode data
102 *
103 * Add @mode to @connector's probed_mode list for later use. This list should
104 * then in a second step get filtered and all the modes actually supported by
105 * the hardware moved to the @connector's modes list.
106 */
drm_mode_probed_add(struct drm_connector * connector,struct drm_display_mode * mode)107 void drm_mode_probed_add(struct drm_connector *connector,
108 struct drm_display_mode *mode)
109 {
110 WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
111
112 list_add_tail(&mode->head, &connector->probed_modes);
113 }
114 EXPORT_SYMBOL(drm_mode_probed_add);
115
116 /**
117 * drm_cvt_mode -create a modeline based on the CVT algorithm
118 * @dev: drm device
119 * @hdisplay: hdisplay size
120 * @vdisplay: vdisplay size
121 * @vrefresh: vrefresh rate
122 * @reduced: whether to use reduced blanking
123 * @interlaced: whether to compute an interlaced mode
124 * @margins: whether to add margins (borders)
125 *
126 * This function is called to generate the modeline based on CVT algorithm
127 * according to the hdisplay, vdisplay, vrefresh.
128 * It is based from the VESA(TM) Coordinated Video Timing Generator by
129 * Graham Loveridge April 9, 2003 available at
130 * http://www.elo.utfsm.cl/~elo212/docs/CVTd6r1.xls
131 *
132 * And it is copied from xf86CVTmode in xserver/hw/xfree86/modes/xf86cvt.c.
133 * What I have done is to translate it by using integer calculation.
134 *
135 * Returns:
136 * The modeline based on the CVT algorithm stored in a drm_display_mode object.
137 * The display mode object is allocated with drm_mode_create(). Returns NULL
138 * when no mode could be allocated.
139 */
drm_cvt_mode(struct drm_device * dev,int hdisplay,int vdisplay,int vrefresh,bool reduced,bool interlaced,bool margins)140 struct drm_display_mode *drm_cvt_mode(struct drm_device *dev, int hdisplay,
141 int vdisplay, int vrefresh,
142 bool reduced, bool interlaced, bool margins)
143 {
144 #define HV_FACTOR 1000
145 /* 1) top/bottom margin size (% of height) - default: 1.8, */
146 #define CVT_MARGIN_PERCENTAGE 18
147 /* 2) character cell horizontal granularity (pixels) - default 8 */
148 #define CVT_H_GRANULARITY 8
149 /* 3) Minimum vertical porch (lines) - default 3 */
150 #define CVT_MIN_V_PORCH 3
151 /* 4) Minimum number of vertical back porch lines - default 6 */
152 #define CVT_MIN_V_BPORCH 6
153 /* Pixel Clock step (kHz) */
154 #define CVT_CLOCK_STEP 250
155 struct drm_display_mode *drm_mode;
156 unsigned int vfieldrate, hperiod;
157 int hdisplay_rnd, hmargin, vdisplay_rnd, vmargin, vsync;
158 int interlace;
159 u64 tmp;
160
161 if (!hdisplay || !vdisplay)
162 return NULL;
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, __maybe_unused 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, __maybe_unused vback_porch;
390 unsigned int vtotal_lines, __maybe_unused vfieldrate_est;
391 unsigned int __maybe_unused hperiod;
392 unsigned int vfield_rate, __maybe_unused vframe_rate;
393 int left_margin, right_margin;
394 unsigned int total_active_pixels, ideal_duty_cycle;
395 unsigned int hblank, total_pixels, pixel_freq;
396 int hsync, hfront_porch, vodd_front_porch_lines;
397 unsigned int tmp1, tmp2;
398
399 if (!hdisplay || !vdisplay)
400 return NULL;
401
402 drm_mode = drm_mode_create(dev);
403 if (!drm_mode)
404 return NULL;
405
406 /* 1. In order to give correct results, the number of horizontal
407 * pixels requested is first processed to ensure that it is divisible
408 * by the character size, by rounding it to the nearest character
409 * cell boundary:
410 */
411 hdisplay_rnd = (hdisplay + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
412 hdisplay_rnd = hdisplay_rnd * GTF_CELL_GRAN;
413
414 /* 2. If interlace is requested, the number of vertical lines assumed
415 * by the calculation must be halved, as the computation calculates
416 * the number of vertical lines per field.
417 */
418 if (interlaced)
419 vdisplay_rnd = vdisplay / 2;
420 else
421 vdisplay_rnd = vdisplay;
422
423 /* 3. Find the frame rate required: */
424 if (interlaced)
425 vfieldrate_rqd = vrefresh * 2;
426 else
427 vfieldrate_rqd = vrefresh;
428
429 /* 4. Find number of lines in Top margin: */
430 top_margin = 0;
431 if (margins)
432 top_margin = (vdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
433 1000;
434 /* 5. Find number of lines in bottom margin: */
435 bottom_margin = top_margin;
436
437 /* 6. If interlace is required, then set variable interlace: */
438 if (interlaced)
439 interlace = 1;
440 else
441 interlace = 0;
442
443 /* 7. Estimate the Horizontal frequency */
444 {
445 tmp1 = (1000000 - MIN_VSYNC_PLUS_BP * vfieldrate_rqd) / 500;
446 tmp2 = (vdisplay_rnd + 2 * top_margin + GTF_MIN_V_PORCH) *
447 2 + interlace;
448 hfreq_est = (tmp2 * 1000 * vfieldrate_rqd) / tmp1;
449 }
450
451 /* 8. Find the number of lines in V sync + back porch */
452 /* [V SYNC+BP] = RINT(([MIN VSYNC+BP] * hfreq_est / 1000000)) */
453 vsync_plus_bp = MIN_VSYNC_PLUS_BP * hfreq_est / 1000;
454 vsync_plus_bp = (vsync_plus_bp + 500) / 1000;
455 /* 9. Find the number of lines in V back porch alone: */
456 vback_porch = vsync_plus_bp - V_SYNC_RQD;
457 /* 10. Find the total number of lines in Vertical field period: */
458 vtotal_lines = vdisplay_rnd + top_margin + bottom_margin +
459 vsync_plus_bp + GTF_MIN_V_PORCH;
460 /* 11. Estimate the Vertical field frequency: */
461 vfieldrate_est = hfreq_est / vtotal_lines;
462 /* 12. Find the actual horizontal period: */
463 hperiod = 1000000 / (vfieldrate_rqd * vtotal_lines);
464
465 /* 13. Find the actual Vertical field frequency: */
466 vfield_rate = hfreq_est / vtotal_lines;
467 /* 14. Find the Vertical frame frequency: */
468 if (interlaced)
469 vframe_rate = vfield_rate / 2;
470 else
471 vframe_rate = vfield_rate;
472 /* 15. Find number of pixels in left margin: */
473 if (margins)
474 left_margin = (hdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
475 1000;
476 else
477 left_margin = 0;
478
479 /* 16.Find number of pixels in right margin: */
480 right_margin = left_margin;
481 /* 17.Find total number of active pixels in image and left and right */
482 total_active_pixels = hdisplay_rnd + left_margin + right_margin;
483 /* 18.Find the ideal blanking duty cycle from blanking duty cycle */
484 ideal_duty_cycle = GTF_C_PRIME * 1000 -
485 (GTF_M_PRIME * 1000000 / hfreq_est);
486 /* 19.Find the number of pixels in the blanking time to the nearest
487 * double character cell: */
488 hblank = total_active_pixels * ideal_duty_cycle /
489 (100000 - ideal_duty_cycle);
490 hblank = (hblank + GTF_CELL_GRAN) / (2 * GTF_CELL_GRAN);
491 hblank = hblank * 2 * GTF_CELL_GRAN;
492 /* 20.Find total number of pixels: */
493 total_pixels = total_active_pixels + hblank;
494 /* 21.Find pixel clock frequency: */
495 pixel_freq = total_pixels * hfreq_est / 1000;
496 /* Stage 1 computations are now complete; I should really pass
497 * the results to another function and do the Stage 2 computations,
498 * but I only need a few more values so I'll just append the
499 * computations here for now */
500 /* 17. Find the number of pixels in the horizontal sync period: */
501 hsync = H_SYNC_PERCENT * total_pixels / 100;
502 hsync = (hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
503 hsync = hsync * GTF_CELL_GRAN;
504 /* 18. Find the number of pixels in horizontal front porch period */
505 hfront_porch = hblank / 2 - hsync;
506 /* 36. Find the number of lines in the odd front porch period: */
507 vodd_front_porch_lines = GTF_MIN_V_PORCH ;
508
509 /* finally, pack the results in the mode struct */
510 drm_mode->hdisplay = hdisplay_rnd;
511 drm_mode->hsync_start = hdisplay_rnd + hfront_porch;
512 drm_mode->hsync_end = drm_mode->hsync_start + hsync;
513 drm_mode->htotal = total_pixels;
514 drm_mode->vdisplay = vdisplay_rnd;
515 drm_mode->vsync_start = vdisplay_rnd + vodd_front_porch_lines;
516 drm_mode->vsync_end = drm_mode->vsync_start + V_SYNC_RQD;
517 drm_mode->vtotal = vtotal_lines;
518
519 drm_mode->clock = pixel_freq;
520
521 if (interlaced) {
522 drm_mode->vtotal *= 2;
523 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
524 }
525
526 drm_mode_set_name(drm_mode);
527 if (GTF_M == 600 && GTF_2C == 80 && GTF_K == 128 && GTF_2J == 40)
528 drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;
529 else
530 drm_mode->flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC;
531
532 return drm_mode;
533 }
534 EXPORT_SYMBOL(drm_gtf_mode_complex);
535
536 /**
537 * drm_gtf_mode - create the modeline based on the GTF algorithm
538 * @dev: drm device
539 * @hdisplay: hdisplay size
540 * @vdisplay: vdisplay size
541 * @vrefresh: vrefresh rate.
542 * @interlaced: whether to compute an interlaced mode
543 * @margins: desired margin (borders) size
544 *
545 * return the modeline based on GTF algorithm
546 *
547 * This function is to create the modeline based on the GTF algorithm.
548 * Generalized Timing Formula is derived from:
549 *
550 * GTF Spreadsheet by Andy Morrish (1/5/97)
551 * available at https://www.vesa.org
552 *
553 * And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf.c.
554 * What I have done is to translate it by using integer calculation.
555 * I also refer to the function of fb_get_mode in the file of
556 * drivers/video/fbmon.c
557 *
558 * Standard GTF parameters::
559 *
560 * M = 600
561 * C = 40
562 * K = 128
563 * J = 20
564 *
565 * Returns:
566 * The modeline based on the GTF algorithm stored in a drm_display_mode object.
567 * The display mode object is allocated with drm_mode_create(). Returns NULL
568 * when no mode could be allocated.
569 */
570 struct drm_display_mode *
drm_gtf_mode(struct drm_device * dev,int hdisplay,int vdisplay,int vrefresh,bool interlaced,int margins)571 drm_gtf_mode(struct drm_device *dev, int hdisplay, int vdisplay, int vrefresh,
572 bool interlaced, int margins)
573 {
574 return drm_gtf_mode_complex(dev, hdisplay, vdisplay, vrefresh,
575 interlaced, margins,
576 600, 40 * 2, 128, 20 * 2);
577 }
578 EXPORT_SYMBOL(drm_gtf_mode);
579
580 #ifdef CONFIG_VIDEOMODE_HELPERS
581 /**
582 * drm_display_mode_from_videomode - fill in @dmode using @vm,
583 * @vm: videomode structure to use as source
584 * @dmode: drm_display_mode structure to use as destination
585 *
586 * Fills out @dmode using the display mode specified in @vm.
587 */
drm_display_mode_from_videomode(const struct videomode * vm,struct drm_display_mode * dmode)588 void drm_display_mode_from_videomode(const struct videomode *vm,
589 struct drm_display_mode *dmode)
590 {
591 dmode->hdisplay = vm->hactive;
592 dmode->hsync_start = dmode->hdisplay + vm->hfront_porch;
593 dmode->hsync_end = dmode->hsync_start + vm->hsync_len;
594 dmode->htotal = dmode->hsync_end + vm->hback_porch;
595
596 dmode->vdisplay = vm->vactive;
597 dmode->vsync_start = dmode->vdisplay + vm->vfront_porch;
598 dmode->vsync_end = dmode->vsync_start + vm->vsync_len;
599 dmode->vtotal = dmode->vsync_end + vm->vback_porch;
600
601 dmode->clock = vm->pixelclock / 1000;
602
603 dmode->flags = 0;
604 if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH)
605 dmode->flags |= DRM_MODE_FLAG_PHSYNC;
606 else if (vm->flags & DISPLAY_FLAGS_HSYNC_LOW)
607 dmode->flags |= DRM_MODE_FLAG_NHSYNC;
608 if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH)
609 dmode->flags |= DRM_MODE_FLAG_PVSYNC;
610 else if (vm->flags & DISPLAY_FLAGS_VSYNC_LOW)
611 dmode->flags |= DRM_MODE_FLAG_NVSYNC;
612 if (vm->flags & DISPLAY_FLAGS_INTERLACED)
613 dmode->flags |= DRM_MODE_FLAG_INTERLACE;
614 if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN)
615 dmode->flags |= DRM_MODE_FLAG_DBLSCAN;
616 if (vm->flags & DISPLAY_FLAGS_DOUBLECLK)
617 dmode->flags |= DRM_MODE_FLAG_DBLCLK;
618 drm_mode_set_name(dmode);
619 }
620 EXPORT_SYMBOL_GPL(drm_display_mode_from_videomode);
621
622 /**
623 * drm_display_mode_to_videomode - fill in @vm using @dmode,
624 * @dmode: drm_display_mode structure to use as source
625 * @vm: videomode structure to use as destination
626 *
627 * Fills out @vm using the display mode specified in @dmode.
628 */
drm_display_mode_to_videomode(const struct drm_display_mode * dmode,struct videomode * vm)629 void drm_display_mode_to_videomode(const struct drm_display_mode *dmode,
630 struct videomode *vm)
631 {
632 vm->hactive = dmode->hdisplay;
633 vm->hfront_porch = dmode->hsync_start - dmode->hdisplay;
634 vm->hsync_len = dmode->hsync_end - dmode->hsync_start;
635 vm->hback_porch = dmode->htotal - dmode->hsync_end;
636
637 vm->vactive = dmode->vdisplay;
638 vm->vfront_porch = dmode->vsync_start - dmode->vdisplay;
639 vm->vsync_len = dmode->vsync_end - dmode->vsync_start;
640 vm->vback_porch = dmode->vtotal - dmode->vsync_end;
641
642 vm->pixelclock = dmode->clock * 1000;
643
644 vm->flags = 0;
645 if (dmode->flags & DRM_MODE_FLAG_PHSYNC)
646 vm->flags |= DISPLAY_FLAGS_HSYNC_HIGH;
647 else if (dmode->flags & DRM_MODE_FLAG_NHSYNC)
648 vm->flags |= DISPLAY_FLAGS_HSYNC_LOW;
649 if (dmode->flags & DRM_MODE_FLAG_PVSYNC)
650 vm->flags |= DISPLAY_FLAGS_VSYNC_HIGH;
651 else if (dmode->flags & DRM_MODE_FLAG_NVSYNC)
652 vm->flags |= DISPLAY_FLAGS_VSYNC_LOW;
653 if (dmode->flags & DRM_MODE_FLAG_INTERLACE)
654 vm->flags |= DISPLAY_FLAGS_INTERLACED;
655 if (dmode->flags & DRM_MODE_FLAG_DBLSCAN)
656 vm->flags |= DISPLAY_FLAGS_DOUBLESCAN;
657 if (dmode->flags & DRM_MODE_FLAG_DBLCLK)
658 vm->flags |= DISPLAY_FLAGS_DOUBLECLK;
659 }
660 EXPORT_SYMBOL_GPL(drm_display_mode_to_videomode);
661
662 /**
663 * drm_bus_flags_from_videomode - extract information about pixelclk and
664 * DE polarity from videomode and store it in a separate variable
665 * @vm: videomode structure to use
666 * @bus_flags: information about pixelclk, sync and DE polarity will be stored
667 * here
668 *
669 * Sets DRM_BUS_FLAG_DE_(LOW|HIGH), DRM_BUS_FLAG_PIXDATA_DRIVE_(POS|NEG)EDGE
670 * and DISPLAY_FLAGS_SYNC_(POS|NEG)EDGE in @bus_flags according to DISPLAY_FLAGS
671 * found in @vm
672 */
drm_bus_flags_from_videomode(const struct videomode * vm,u32 * bus_flags)673 void drm_bus_flags_from_videomode(const struct videomode *vm, u32 *bus_flags)
674 {
675 *bus_flags = 0;
676 if (vm->flags & DISPLAY_FLAGS_PIXDATA_POSEDGE)
677 *bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE;
678 if (vm->flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
679 *bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE;
680
681 if (vm->flags & DISPLAY_FLAGS_SYNC_POSEDGE)
682 *bus_flags |= DRM_BUS_FLAG_SYNC_DRIVE_POSEDGE;
683 if (vm->flags & DISPLAY_FLAGS_SYNC_NEGEDGE)
684 *bus_flags |= DRM_BUS_FLAG_SYNC_DRIVE_NEGEDGE;
685
686 if (vm->flags & DISPLAY_FLAGS_DE_LOW)
687 *bus_flags |= DRM_BUS_FLAG_DE_LOW;
688 if (vm->flags & DISPLAY_FLAGS_DE_HIGH)
689 *bus_flags |= DRM_BUS_FLAG_DE_HIGH;
690 }
691 EXPORT_SYMBOL_GPL(drm_bus_flags_from_videomode);
692
693 #ifdef CONFIG_OF
694 /**
695 * of_get_drm_display_mode - get a drm_display_mode from devicetree
696 * @np: device_node with the timing specification
697 * @dmode: will be set to the return value
698 * @bus_flags: information about pixelclk, sync and DE polarity
699 * @index: index into the list of display timings in devicetree
700 *
701 * This function is expensive and should only be used, if only one mode is to be
702 * read from DT. To get multiple modes start with of_get_display_timings and
703 * work with that instead.
704 *
705 * Returns:
706 * 0 on success, a negative errno code when no of videomode node was found.
707 */
of_get_drm_display_mode(struct device_node * np,struct drm_display_mode * dmode,u32 * bus_flags,int index)708 int of_get_drm_display_mode(struct device_node *np,
709 struct drm_display_mode *dmode, u32 *bus_flags,
710 int index)
711 {
712 struct videomode vm;
713 int ret;
714
715 ret = of_get_videomode(np, &vm, index);
716 if (ret)
717 return ret;
718
719 drm_display_mode_from_videomode(&vm, dmode);
720 if (bus_flags)
721 drm_bus_flags_from_videomode(&vm, bus_flags);
722
723 pr_debug("%pOF: got %dx%d display mode\n",
724 np, vm.hactive, vm.vactive);
725 drm_mode_debug_printmodeline(dmode);
726
727 return 0;
728 }
729 EXPORT_SYMBOL_GPL(of_get_drm_display_mode);
730 #endif /* CONFIG_OF */
731 #endif /* CONFIG_VIDEOMODE_HELPERS */
732
733 /**
734 * drm_mode_set_name - set the name on a mode
735 * @mode: name will be set in this mode
736 *
737 * Set the name of @mode to a standard format which is <hdisplay>x<vdisplay>
738 * with an optional 'i' suffix for interlaced modes.
739 */
drm_mode_set_name(struct drm_display_mode * mode)740 void drm_mode_set_name(struct drm_display_mode *mode)
741 {
742 bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
743
744 snprintf(mode->name, DRM_DISPLAY_MODE_LEN, "%dx%d%s",
745 mode->hdisplay, mode->vdisplay,
746 interlaced ? "i" : "");
747 }
748 EXPORT_SYMBOL(drm_mode_set_name);
749
750 /**
751 * drm_mode_vrefresh - get the vrefresh of a mode
752 * @mode: mode
753 *
754 * Returns:
755 * @modes's vrefresh rate in Hz, rounded to the nearest integer. Calculates the
756 * value first if it is not yet set.
757 */
drm_mode_vrefresh(const struct drm_display_mode * mode)758 int drm_mode_vrefresh(const struct drm_display_mode *mode)
759 {
760 unsigned int num, den;
761
762 if (mode->htotal == 0 || mode->vtotal == 0)
763 return 0;
764
765 num = mode->clock;
766 den = mode->htotal * mode->vtotal;
767
768 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
769 num *= 2;
770 if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
771 den *= 2;
772 if (mode->vscan > 1)
773 den *= mode->vscan;
774
775 return DIV_ROUND_CLOSEST_ULL(mul_u32_u32(num, 1000), den);
776 }
777 EXPORT_SYMBOL(drm_mode_vrefresh);
778
779 /**
780 * drm_mode_get_hv_timing - Fetches hdisplay/vdisplay for given mode
781 * @mode: mode to query
782 * @hdisplay: hdisplay value to fill in
783 * @vdisplay: vdisplay value to fill in
784 *
785 * The vdisplay value will be doubled if the specified mode is a stereo mode of
786 * the appropriate layout.
787 */
drm_mode_get_hv_timing(const struct drm_display_mode * mode,int * hdisplay,int * vdisplay)788 void drm_mode_get_hv_timing(const struct drm_display_mode *mode,
789 int *hdisplay, int *vdisplay)
790 {
791 struct drm_display_mode adjusted = *mode;
792
793 drm_mode_set_crtcinfo(&adjusted, CRTC_STEREO_DOUBLE_ONLY);
794 *hdisplay = adjusted.crtc_hdisplay;
795 *vdisplay = adjusted.crtc_vdisplay;
796 }
797 EXPORT_SYMBOL(drm_mode_get_hv_timing);
798
799 /**
800 * drm_mode_set_crtcinfo - set CRTC modesetting timing parameters
801 * @p: mode
802 * @adjust_flags: a combination of adjustment flags
803 *
804 * Setup the CRTC modesetting timing parameters for @p, adjusting if necessary.
805 *
806 * - The CRTC_INTERLACE_HALVE_V flag can be used to halve vertical timings of
807 * interlaced modes.
808 * - The CRTC_STEREO_DOUBLE flag can be used to compute the timings for
809 * buffers containing two eyes (only adjust the timings when needed, eg. for
810 * "frame packing" or "side by side full").
811 * - The CRTC_NO_DBLSCAN and CRTC_NO_VSCAN flags request that adjustment *not*
812 * be performed for doublescan and vscan > 1 modes respectively.
813 */
drm_mode_set_crtcinfo(struct drm_display_mode * p,int adjust_flags)814 void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
815 {
816 if (!p)
817 return;
818
819 p->crtc_clock = p->clock;
820 p->crtc_hdisplay = p->hdisplay;
821 p->crtc_hsync_start = p->hsync_start;
822 p->crtc_hsync_end = p->hsync_end;
823 p->crtc_htotal = p->htotal;
824 p->crtc_hskew = p->hskew;
825 p->crtc_vdisplay = p->vdisplay;
826 p->crtc_vsync_start = p->vsync_start;
827 p->crtc_vsync_end = p->vsync_end;
828 p->crtc_vtotal = p->vtotal;
829
830 if (p->flags & DRM_MODE_FLAG_INTERLACE) {
831 if (adjust_flags & CRTC_INTERLACE_HALVE_V) {
832 p->crtc_vdisplay /= 2;
833 p->crtc_vsync_start /= 2;
834 p->crtc_vsync_end /= 2;
835 p->crtc_vtotal /= 2;
836 }
837 }
838
839 if (!(adjust_flags & CRTC_NO_DBLSCAN)) {
840 if (p->flags & DRM_MODE_FLAG_DBLSCAN) {
841 p->crtc_vdisplay *= 2;
842 p->crtc_vsync_start *= 2;
843 p->crtc_vsync_end *= 2;
844 p->crtc_vtotal *= 2;
845 }
846 }
847
848 if (!(adjust_flags & CRTC_NO_VSCAN)) {
849 if (p->vscan > 1) {
850 p->crtc_vdisplay *= p->vscan;
851 p->crtc_vsync_start *= p->vscan;
852 p->crtc_vsync_end *= p->vscan;
853 p->crtc_vtotal *= p->vscan;
854 }
855 }
856
857 if (adjust_flags & CRTC_STEREO_DOUBLE) {
858 unsigned int layout = p->flags & DRM_MODE_FLAG_3D_MASK;
859
860 switch (layout) {
861 case DRM_MODE_FLAG_3D_FRAME_PACKING:
862 p->crtc_clock *= 2;
863 p->crtc_vdisplay += p->crtc_vtotal;
864 p->crtc_vsync_start += p->crtc_vtotal;
865 p->crtc_vsync_end += p->crtc_vtotal;
866 p->crtc_vtotal += p->crtc_vtotal;
867 break;
868 }
869 }
870
871 p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
872 p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
873 p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);
874 p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);
875 }
876 EXPORT_SYMBOL(drm_mode_set_crtcinfo);
877
878 /**
879 * drm_mode_copy - copy the mode
880 * @dst: mode to overwrite
881 * @src: mode to copy
882 *
883 * Copy an existing mode into another mode, preserving the object id and
884 * list head of the destination mode.
885 */
drm_mode_copy(struct drm_display_mode * dst,const struct drm_display_mode * src)886 void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode *src)
887 {
888 struct list_head head = dst->head;
889
890 *dst = *src;
891 dst->head = head;
892 }
893 EXPORT_SYMBOL(drm_mode_copy);
894
895 /**
896 * drm_mode_duplicate - allocate and duplicate an existing mode
897 * @dev: drm_device to allocate the duplicated mode for
898 * @mode: mode to duplicate
899 *
900 * Just allocate a new mode, copy the existing mode into it, and return
901 * a pointer to it. Used to create new instances of established modes.
902 *
903 * Returns:
904 * Pointer to duplicated mode on success, NULL on error.
905 */
drm_mode_duplicate(struct drm_device * dev,const struct drm_display_mode * mode)906 struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
907 const struct drm_display_mode *mode)
908 {
909 struct drm_display_mode *nmode;
910
911 nmode = drm_mode_create(dev);
912 if (!nmode)
913 return NULL;
914
915 drm_mode_copy(nmode, mode);
916
917 return nmode;
918 }
919 EXPORT_SYMBOL(drm_mode_duplicate);
920
drm_mode_match_timings(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)921 static bool drm_mode_match_timings(const struct drm_display_mode *mode1,
922 const struct drm_display_mode *mode2)
923 {
924 return mode1->hdisplay == mode2->hdisplay &&
925 mode1->hsync_start == mode2->hsync_start &&
926 mode1->hsync_end == mode2->hsync_end &&
927 mode1->htotal == mode2->htotal &&
928 mode1->hskew == mode2->hskew &&
929 mode1->vdisplay == mode2->vdisplay &&
930 mode1->vsync_start == mode2->vsync_start &&
931 mode1->vsync_end == mode2->vsync_end &&
932 mode1->vtotal == mode2->vtotal &&
933 mode1->vscan == mode2->vscan;
934 }
935
drm_mode_match_clock(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)936 static bool drm_mode_match_clock(const struct drm_display_mode *mode1,
937 const struct drm_display_mode *mode2)
938 {
939 /*
940 * do clock check convert to PICOS
941 * so fb modes get matched the same
942 */
943 if (mode1->clock && mode2->clock)
944 return KHZ2PICOS(mode1->clock) == KHZ2PICOS(mode2->clock);
945 else
946 return mode1->clock == mode2->clock;
947 }
948
drm_mode_match_flags(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)949 static bool drm_mode_match_flags(const struct drm_display_mode *mode1,
950 const struct drm_display_mode *mode2)
951 {
952 return (mode1->flags & ~DRM_MODE_FLAG_3D_MASK) ==
953 (mode2->flags & ~DRM_MODE_FLAG_3D_MASK);
954 }
955
drm_mode_match_3d_flags(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)956 static bool drm_mode_match_3d_flags(const struct drm_display_mode *mode1,
957 const struct drm_display_mode *mode2)
958 {
959 return (mode1->flags & DRM_MODE_FLAG_3D_MASK) ==
960 (mode2->flags & DRM_MODE_FLAG_3D_MASK);
961 }
962
drm_mode_match_aspect_ratio(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)963 static bool drm_mode_match_aspect_ratio(const struct drm_display_mode *mode1,
964 const struct drm_display_mode *mode2)
965 {
966 return mode1->picture_aspect_ratio == mode2->picture_aspect_ratio;
967 }
968
969 /**
970 * drm_mode_match - test modes for (partial) equality
971 * @mode1: first mode
972 * @mode2: second mode
973 * @match_flags: which parts need to match (DRM_MODE_MATCH_*)
974 *
975 * Check to see if @mode1 and @mode2 are equivalent.
976 *
977 * Returns:
978 * True if the modes are (partially) equal, false otherwise.
979 */
drm_mode_match(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2,unsigned int match_flags)980 bool drm_mode_match(const struct drm_display_mode *mode1,
981 const struct drm_display_mode *mode2,
982 unsigned int match_flags)
983 {
984 if (!mode1 && !mode2)
985 return true;
986
987 if (!mode1 || !mode2)
988 return false;
989
990 if (match_flags & DRM_MODE_MATCH_TIMINGS &&
991 !drm_mode_match_timings(mode1, mode2))
992 return false;
993
994 if (match_flags & DRM_MODE_MATCH_CLOCK &&
995 !drm_mode_match_clock(mode1, mode2))
996 return false;
997
998 if (match_flags & DRM_MODE_MATCH_FLAGS &&
999 !drm_mode_match_flags(mode1, mode2))
1000 return false;
1001
1002 if (match_flags & DRM_MODE_MATCH_3D_FLAGS &&
1003 !drm_mode_match_3d_flags(mode1, mode2))
1004 return false;
1005
1006 if (match_flags & DRM_MODE_MATCH_ASPECT_RATIO &&
1007 !drm_mode_match_aspect_ratio(mode1, mode2))
1008 return false;
1009
1010 return true;
1011 }
1012 EXPORT_SYMBOL(drm_mode_match);
1013
1014 /**
1015 * drm_mode_equal - test modes for equality
1016 * @mode1: first mode
1017 * @mode2: second mode
1018 *
1019 * Check to see if @mode1 and @mode2 are equivalent.
1020 *
1021 * Returns:
1022 * True if the modes are equal, false otherwise.
1023 */
drm_mode_equal(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1024 bool drm_mode_equal(const struct drm_display_mode *mode1,
1025 const struct drm_display_mode *mode2)
1026 {
1027 return drm_mode_match(mode1, mode2,
1028 DRM_MODE_MATCH_TIMINGS |
1029 DRM_MODE_MATCH_CLOCK |
1030 DRM_MODE_MATCH_FLAGS |
1031 DRM_MODE_MATCH_3D_FLAGS|
1032 DRM_MODE_MATCH_ASPECT_RATIO);
1033 }
1034 EXPORT_SYMBOL(drm_mode_equal);
1035
1036 /**
1037 * drm_mode_equal_no_clocks - test modes for equality
1038 * @mode1: first mode
1039 * @mode2: second mode
1040 *
1041 * Check to see if @mode1 and @mode2 are equivalent, but
1042 * don't check the pixel clocks.
1043 *
1044 * Returns:
1045 * True if the modes are equal, false otherwise.
1046 */
drm_mode_equal_no_clocks(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1047 bool drm_mode_equal_no_clocks(const struct drm_display_mode *mode1,
1048 const struct drm_display_mode *mode2)
1049 {
1050 return drm_mode_match(mode1, mode2,
1051 DRM_MODE_MATCH_TIMINGS |
1052 DRM_MODE_MATCH_FLAGS |
1053 DRM_MODE_MATCH_3D_FLAGS);
1054 }
1055 EXPORT_SYMBOL(drm_mode_equal_no_clocks);
1056
1057 /**
1058 * drm_mode_equal_no_clocks_no_stereo - test modes for equality
1059 * @mode1: first mode
1060 * @mode2: second mode
1061 *
1062 * Check to see if @mode1 and @mode2 are equivalent, but
1063 * don't check the pixel clocks nor the stereo layout.
1064 *
1065 * Returns:
1066 * True if the modes are equal, false otherwise.
1067 */
drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1068 bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1,
1069 const struct drm_display_mode *mode2)
1070 {
1071 return drm_mode_match(mode1, mode2,
1072 DRM_MODE_MATCH_TIMINGS |
1073 DRM_MODE_MATCH_FLAGS);
1074 }
1075 EXPORT_SYMBOL(drm_mode_equal_no_clocks_no_stereo);
1076
1077 static enum drm_mode_status
drm_mode_validate_basic(const struct drm_display_mode * mode)1078 drm_mode_validate_basic(const struct drm_display_mode *mode)
1079 {
1080 if (mode->type & ~DRM_MODE_TYPE_ALL)
1081 return MODE_BAD;
1082
1083 if (mode->flags & ~DRM_MODE_FLAG_ALL)
1084 return MODE_BAD;
1085
1086 if ((mode->flags & DRM_MODE_FLAG_3D_MASK) > DRM_MODE_FLAG_3D_MAX)
1087 return MODE_BAD;
1088
1089 if (mode->clock == 0)
1090 return MODE_CLOCK_LOW;
1091
1092 if (mode->hdisplay == 0 ||
1093 mode->hsync_start < mode->hdisplay ||
1094 mode->hsync_end < mode->hsync_start ||
1095 mode->htotal < mode->hsync_end)
1096 return MODE_H_ILLEGAL;
1097
1098 if (mode->vdisplay == 0 ||
1099 mode->vsync_start < mode->vdisplay ||
1100 mode->vsync_end < mode->vsync_start ||
1101 mode->vtotal < mode->vsync_end)
1102 return MODE_V_ILLEGAL;
1103
1104 return MODE_OK;
1105 }
1106
1107 /**
1108 * drm_mode_validate_driver - make sure the mode is somewhat sane
1109 * @dev: drm device
1110 * @mode: mode to check
1111 *
1112 * First do basic validation on the mode, and then allow the driver
1113 * to check for device/driver specific limitations via the optional
1114 * &drm_mode_config_helper_funcs.mode_valid hook.
1115 *
1116 * Returns:
1117 * The mode status
1118 */
1119 enum drm_mode_status
drm_mode_validate_driver(struct drm_device * dev,const struct drm_display_mode * mode)1120 drm_mode_validate_driver(struct drm_device *dev,
1121 const struct drm_display_mode *mode)
1122 {
1123 enum drm_mode_status status;
1124
1125 status = drm_mode_validate_basic(mode);
1126 if (status != MODE_OK)
1127 return status;
1128
1129 if (dev->mode_config.funcs->mode_valid)
1130 return dev->mode_config.funcs->mode_valid(dev, mode);
1131 else
1132 return MODE_OK;
1133 }
1134 EXPORT_SYMBOL(drm_mode_validate_driver);
1135
1136 /**
1137 * drm_mode_validate_size - make sure modes adhere to size constraints
1138 * @mode: mode to check
1139 * @maxX: maximum width
1140 * @maxY: maximum height
1141 *
1142 * This function is a helper which can be used to validate modes against size
1143 * limitations of the DRM device/connector. If a mode is too big its status
1144 * member is updated with the appropriate validation failure code. The list
1145 * itself is not changed.
1146 *
1147 * Returns:
1148 * The mode status
1149 */
1150 enum drm_mode_status
drm_mode_validate_size(const struct drm_display_mode * mode,int maxX,int maxY)1151 drm_mode_validate_size(const struct drm_display_mode *mode,
1152 int maxX, int maxY)
1153 {
1154 if (maxX > 0 && mode->hdisplay > maxX)
1155 return MODE_VIRTUAL_X;
1156
1157 if (maxY > 0 && mode->vdisplay > maxY)
1158 return MODE_VIRTUAL_Y;
1159
1160 return MODE_OK;
1161 }
1162 EXPORT_SYMBOL(drm_mode_validate_size);
1163
1164 /**
1165 * drm_mode_validate_ycbcr420 - add 'ycbcr420-only' modes only when allowed
1166 * @mode: mode to check
1167 * @connector: drm connector under action
1168 *
1169 * This function is a helper which can be used to filter out any YCBCR420
1170 * only mode, when the source doesn't support it.
1171 *
1172 * Returns:
1173 * The mode status
1174 */
1175 enum drm_mode_status
drm_mode_validate_ycbcr420(const struct drm_display_mode * mode,struct drm_connector * connector)1176 drm_mode_validate_ycbcr420(const struct drm_display_mode *mode,
1177 struct drm_connector *connector)
1178 {
1179 u8 vic = drm_match_cea_mode(mode);
1180 enum drm_mode_status status = MODE_OK;
1181 struct drm_hdmi_info *hdmi = &connector->display_info.hdmi;
1182
1183 if (test_bit(vic, hdmi->y420_vdb_modes)) {
1184 if (!connector->ycbcr_420_allowed)
1185 status = MODE_NO_420;
1186 }
1187
1188 return status;
1189 }
1190 EXPORT_SYMBOL(drm_mode_validate_ycbcr420);
1191
1192 #define MODE_STATUS(status) [MODE_ ## status + 3] = #status
1193
1194 static const char * const drm_mode_status_names[] = {
1195 MODE_STATUS(OK),
1196 MODE_STATUS(HSYNC),
1197 MODE_STATUS(VSYNC),
1198 MODE_STATUS(H_ILLEGAL),
1199 MODE_STATUS(V_ILLEGAL),
1200 MODE_STATUS(BAD_WIDTH),
1201 MODE_STATUS(NOMODE),
1202 MODE_STATUS(NO_INTERLACE),
1203 MODE_STATUS(NO_DBLESCAN),
1204 MODE_STATUS(NO_VSCAN),
1205 MODE_STATUS(MEM),
1206 MODE_STATUS(VIRTUAL_X),
1207 MODE_STATUS(VIRTUAL_Y),
1208 MODE_STATUS(MEM_VIRT),
1209 MODE_STATUS(NOCLOCK),
1210 MODE_STATUS(CLOCK_HIGH),
1211 MODE_STATUS(CLOCK_LOW),
1212 MODE_STATUS(CLOCK_RANGE),
1213 MODE_STATUS(BAD_HVALUE),
1214 MODE_STATUS(BAD_VVALUE),
1215 MODE_STATUS(BAD_VSCAN),
1216 MODE_STATUS(HSYNC_NARROW),
1217 MODE_STATUS(HSYNC_WIDE),
1218 MODE_STATUS(HBLANK_NARROW),
1219 MODE_STATUS(HBLANK_WIDE),
1220 MODE_STATUS(VSYNC_NARROW),
1221 MODE_STATUS(VSYNC_WIDE),
1222 MODE_STATUS(VBLANK_NARROW),
1223 MODE_STATUS(VBLANK_WIDE),
1224 MODE_STATUS(PANEL),
1225 MODE_STATUS(INTERLACE_WIDTH),
1226 MODE_STATUS(ONE_WIDTH),
1227 MODE_STATUS(ONE_HEIGHT),
1228 MODE_STATUS(ONE_SIZE),
1229 MODE_STATUS(NO_REDUCED),
1230 MODE_STATUS(NO_STEREO),
1231 MODE_STATUS(NO_420),
1232 MODE_STATUS(STALE),
1233 MODE_STATUS(BAD),
1234 MODE_STATUS(ERROR),
1235 };
1236
1237 #undef MODE_STATUS
1238
drm_get_mode_status_name(enum drm_mode_status status)1239 const char *drm_get_mode_status_name(enum drm_mode_status status)
1240 {
1241 int index = status + 3;
1242
1243 if (WARN_ON(index < 0 || index >= ARRAY_SIZE(drm_mode_status_names)))
1244 return "";
1245
1246 return drm_mode_status_names[index];
1247 }
1248
1249 /**
1250 * drm_mode_prune_invalid - remove invalid modes from mode list
1251 * @dev: DRM device
1252 * @mode_list: list of modes to check
1253 * @verbose: be verbose about it
1254 *
1255 * This helper function can be used to prune a display mode list after
1256 * validation has been completed. All modes whose status is not MODE_OK will be
1257 * removed from the list, and if @verbose the status code and mode name is also
1258 * printed to dmesg.
1259 */
drm_mode_prune_invalid(struct drm_device * dev,struct list_head * mode_list,bool verbose)1260 void drm_mode_prune_invalid(struct drm_device *dev,
1261 struct list_head *mode_list, bool verbose)
1262 {
1263 struct drm_display_mode *mode, *t;
1264
1265 list_for_each_entry_safe(mode, t, mode_list, head) {
1266 if (mode->status != MODE_OK) {
1267 list_del(&mode->head);
1268 if (verbose) {
1269 drm_mode_debug_printmodeline(mode);
1270 DRM_DEBUG_KMS("Not using %s mode: %s\n",
1271 mode->name,
1272 drm_get_mode_status_name(mode->status));
1273 }
1274 drm_mode_destroy(dev, mode);
1275 }
1276 }
1277 }
1278 EXPORT_SYMBOL(drm_mode_prune_invalid);
1279
1280 /**
1281 * drm_mode_compare - compare modes for favorability
1282 * @priv: unused
1283 * @lh_a: list_head for first mode
1284 * @lh_b: list_head for second mode
1285 *
1286 * Compare two modes, given by @lh_a and @lh_b, returning a value indicating
1287 * which is better.
1288 *
1289 * Returns:
1290 * Negative if @lh_a is better than @lh_b, zero if they're equivalent, or
1291 * positive if @lh_b is better than @lh_a.
1292 */
drm_mode_compare(void * priv,const struct list_head * lh_a,const struct list_head * lh_b)1293 static int drm_mode_compare(void *priv, const struct list_head *lh_a,
1294 const struct list_head *lh_b)
1295 {
1296 struct drm_display_mode *a = list_entry(lh_a, struct drm_display_mode, head);
1297 struct drm_display_mode *b = list_entry(lh_b, struct drm_display_mode, head);
1298 int diff;
1299
1300 diff = ((b->type & DRM_MODE_TYPE_PREFERRED) != 0) -
1301 ((a->type & DRM_MODE_TYPE_PREFERRED) != 0);
1302 if (diff)
1303 return diff;
1304 diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay;
1305 if (diff)
1306 return diff;
1307
1308 diff = drm_mode_vrefresh(b) - drm_mode_vrefresh(a);
1309 if (diff)
1310 return diff;
1311
1312 diff = b->clock - a->clock;
1313 return diff;
1314 }
1315
1316 /**
1317 * drm_mode_sort - sort mode list
1318 * @mode_list: list of drm_display_mode structures to sort
1319 *
1320 * Sort @mode_list by favorability, moving good modes to the head of the list.
1321 */
drm_mode_sort(struct list_head * mode_list)1322 void drm_mode_sort(struct list_head *mode_list)
1323 {
1324 list_sort(NULL, mode_list, drm_mode_compare);
1325 }
1326 EXPORT_SYMBOL(drm_mode_sort);
1327
1328 /**
1329 * drm_connector_list_update - update the mode list for the connector
1330 * @connector: the connector to update
1331 *
1332 * This moves the modes from the @connector probed_modes list
1333 * to the actual mode list. It compares the probed mode against the current
1334 * list and only adds different/new modes.
1335 *
1336 * This is just a helper functions doesn't validate any modes itself and also
1337 * doesn't prune any invalid modes. Callers need to do that themselves.
1338 */
drm_connector_list_update(struct drm_connector * connector)1339 void drm_connector_list_update(struct drm_connector *connector)
1340 {
1341 struct drm_display_mode *pmode, *pt;
1342
1343 WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
1344
1345 list_for_each_entry_safe(pmode, pt, &connector->probed_modes, head) {
1346 struct drm_display_mode *mode;
1347 bool found_it = false;
1348
1349 /* go through current modes checking for the new probed mode */
1350 list_for_each_entry(mode, &connector->modes, head) {
1351 if (!drm_mode_equal(pmode, mode))
1352 continue;
1353
1354 found_it = true;
1355
1356 /*
1357 * If the old matching mode is stale (ie. left over
1358 * from a previous probe) just replace it outright.
1359 * Otherwise just merge the type bits between all
1360 * equal probed modes.
1361 *
1362 * If two probed modes are considered equal, pick the
1363 * actual timings from the one that's marked as
1364 * preferred (in case the match isn't 100%). If
1365 * multiple or zero preferred modes are present, favor
1366 * the mode added to the probed_modes list first.
1367 */
1368 if (mode->status == MODE_STALE) {
1369 drm_mode_copy(mode, pmode);
1370 } else if ((mode->type & DRM_MODE_TYPE_PREFERRED) == 0 &&
1371 (pmode->type & DRM_MODE_TYPE_PREFERRED) != 0) {
1372 pmode->type |= mode->type;
1373 drm_mode_copy(mode, pmode);
1374 } else {
1375 mode->type |= pmode->type;
1376 }
1377
1378 list_del(&pmode->head);
1379 drm_mode_destroy(connector->dev, pmode);
1380 break;
1381 }
1382
1383 if (!found_it) {
1384 list_move_tail(&pmode->head, &connector->modes);
1385 }
1386 }
1387 }
1388 EXPORT_SYMBOL(drm_connector_list_update);
1389
drm_mode_parse_cmdline_bpp(const char * str,char ** end_ptr,struct drm_cmdline_mode * mode)1390 static int drm_mode_parse_cmdline_bpp(const char *str, char **end_ptr,
1391 struct drm_cmdline_mode *mode)
1392 {
1393 unsigned int bpp;
1394
1395 if (str[0] != '-')
1396 return -EINVAL;
1397
1398 str++;
1399 bpp = simple_strtol(str, end_ptr, 10);
1400 if (*end_ptr == str)
1401 return -EINVAL;
1402
1403 mode->bpp = bpp;
1404 mode->bpp_specified = true;
1405
1406 return 0;
1407 }
1408
drm_mode_parse_cmdline_refresh(const char * str,char ** end_ptr,struct drm_cmdline_mode * mode)1409 static int drm_mode_parse_cmdline_refresh(const char *str, char **end_ptr,
1410 struct drm_cmdline_mode *mode)
1411 {
1412 unsigned int refresh;
1413
1414 if (str[0] != '@')
1415 return -EINVAL;
1416
1417 str++;
1418 refresh = simple_strtol(str, end_ptr, 10);
1419 if (*end_ptr == str)
1420 return -EINVAL;
1421
1422 mode->refresh = refresh;
1423 mode->refresh_specified = true;
1424
1425 return 0;
1426 }
1427
drm_mode_parse_cmdline_extra(const char * str,int length,bool freestanding,const struct drm_connector * connector,struct drm_cmdline_mode * mode)1428 static int drm_mode_parse_cmdline_extra(const char *str, int length,
1429 bool freestanding,
1430 const struct drm_connector *connector,
1431 struct drm_cmdline_mode *mode)
1432 {
1433 int i;
1434
1435 for (i = 0; i < length; i++) {
1436 switch (str[i]) {
1437 case 'i':
1438 if (freestanding)
1439 return -EINVAL;
1440
1441 mode->interlace = true;
1442 break;
1443 case 'm':
1444 if (freestanding)
1445 return -EINVAL;
1446
1447 mode->margins = true;
1448 break;
1449 case 'D':
1450 if (mode->force != DRM_FORCE_UNSPECIFIED)
1451 return -EINVAL;
1452
1453 if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
1454 (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
1455 mode->force = DRM_FORCE_ON;
1456 else
1457 mode->force = DRM_FORCE_ON_DIGITAL;
1458 break;
1459 case 'd':
1460 if (mode->force != DRM_FORCE_UNSPECIFIED)
1461 return -EINVAL;
1462
1463 mode->force = DRM_FORCE_OFF;
1464 break;
1465 case 'e':
1466 if (mode->force != DRM_FORCE_UNSPECIFIED)
1467 return -EINVAL;
1468
1469 mode->force = DRM_FORCE_ON;
1470 break;
1471 default:
1472 return -EINVAL;
1473 }
1474 }
1475
1476 return 0;
1477 }
1478
drm_mode_parse_cmdline_res_mode(const char * str,unsigned int length,bool extras,const struct drm_connector * connector,struct drm_cmdline_mode * mode)1479 static int drm_mode_parse_cmdline_res_mode(const char *str, unsigned int length,
1480 bool extras,
1481 const struct drm_connector *connector,
1482 struct drm_cmdline_mode *mode)
1483 {
1484 const char *str_start = str;
1485 bool rb = false, cvt = false;
1486 int xres = 0, yres = 0;
1487 int remaining, i;
1488 char *end_ptr;
1489
1490 xres = simple_strtol(str, &end_ptr, 10);
1491 if (end_ptr == str)
1492 return -EINVAL;
1493
1494 if (end_ptr[0] != 'x')
1495 return -EINVAL;
1496 end_ptr++;
1497
1498 str = end_ptr;
1499 yres = simple_strtol(str, &end_ptr, 10);
1500 if (end_ptr == str)
1501 return -EINVAL;
1502
1503 remaining = length - (end_ptr - str_start);
1504 if (remaining < 0)
1505 return -EINVAL;
1506
1507 for (i = 0; i < remaining; i++) {
1508 switch (end_ptr[i]) {
1509 case 'M':
1510 cvt = true;
1511 break;
1512 case 'R':
1513 rb = true;
1514 break;
1515 default:
1516 /*
1517 * Try to pass that to our extras parsing
1518 * function to handle the case where the
1519 * extras are directly after the resolution
1520 */
1521 if (extras) {
1522 int ret = drm_mode_parse_cmdline_extra(end_ptr + i,
1523 1,
1524 false,
1525 connector,
1526 mode);
1527 if (ret)
1528 return ret;
1529 } else {
1530 return -EINVAL;
1531 }
1532 }
1533 }
1534
1535 mode->xres = xres;
1536 mode->yres = yres;
1537 mode->cvt = cvt;
1538 mode->rb = rb;
1539
1540 return 0;
1541 }
1542
drm_mode_parse_cmdline_int(const char * delim,unsigned int * int_ret)1543 static int drm_mode_parse_cmdline_int(const char *delim, unsigned int *int_ret)
1544 {
1545 const char *value;
1546 char *endp;
1547
1548 /*
1549 * delim must point to the '=', otherwise it is a syntax error and
1550 * if delim points to the terminating zero, then delim + 1 wil point
1551 * past the end of the string.
1552 */
1553 if (*delim != '=')
1554 return -EINVAL;
1555
1556 value = delim + 1;
1557 *int_ret = simple_strtol(value, &endp, 10);
1558
1559 /* Make sure we have parsed something */
1560 if (endp == value)
1561 return -EINVAL;
1562
1563 return 0;
1564 }
1565
drm_mode_parse_panel_orientation(const char * delim,struct drm_cmdline_mode * mode)1566 static int drm_mode_parse_panel_orientation(const char *delim,
1567 struct drm_cmdline_mode *mode)
1568 {
1569 const char *value;
1570
1571 if (*delim != '=')
1572 return -EINVAL;
1573
1574 value = delim + 1;
1575 delim = strchr(value, ',');
1576 if (!delim)
1577 delim = value + strlen(value);
1578
1579 if (!strncmp(value, "normal", delim - value))
1580 mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_NORMAL;
1581 else if (!strncmp(value, "upside_down", delim - value))
1582 mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP;
1583 else if (!strncmp(value, "left_side_up", delim - value))
1584 mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_LEFT_UP;
1585 else if (!strncmp(value, "right_side_up", delim - value))
1586 mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_RIGHT_UP;
1587 else
1588 return -EINVAL;
1589
1590 return 0;
1591 }
1592
drm_mode_parse_cmdline_options(const char * str,bool freestanding,const struct drm_connector * connector,struct drm_cmdline_mode * mode)1593 static int drm_mode_parse_cmdline_options(const char *str,
1594 bool freestanding,
1595 const struct drm_connector *connector,
1596 struct drm_cmdline_mode *mode)
1597 {
1598 unsigned int deg, margin, rotation = 0;
1599 const char *delim, *option, *sep;
1600
1601 option = str;
1602 do {
1603 delim = strchr(option, '=');
1604 if (!delim) {
1605 delim = strchr(option, ',');
1606
1607 if (!delim)
1608 delim = option + strlen(option);
1609 }
1610
1611 if (!strncmp(option, "rotate", delim - option)) {
1612 if (drm_mode_parse_cmdline_int(delim, °))
1613 return -EINVAL;
1614
1615 switch (deg) {
1616 case 0:
1617 rotation |= DRM_MODE_ROTATE_0;
1618 break;
1619
1620 case 90:
1621 rotation |= DRM_MODE_ROTATE_90;
1622 break;
1623
1624 case 180:
1625 rotation |= DRM_MODE_ROTATE_180;
1626 break;
1627
1628 case 270:
1629 rotation |= DRM_MODE_ROTATE_270;
1630 break;
1631
1632 default:
1633 return -EINVAL;
1634 }
1635 } else if (!strncmp(option, "reflect_x", delim - option)) {
1636 rotation |= DRM_MODE_REFLECT_X;
1637 } else if (!strncmp(option, "reflect_y", delim - option)) {
1638 rotation |= DRM_MODE_REFLECT_Y;
1639 } else if (!strncmp(option, "margin_right", delim - option)) {
1640 if (drm_mode_parse_cmdline_int(delim, &margin))
1641 return -EINVAL;
1642
1643 mode->tv_margins.right = margin;
1644 } else if (!strncmp(option, "margin_left", delim - option)) {
1645 if (drm_mode_parse_cmdline_int(delim, &margin))
1646 return -EINVAL;
1647
1648 mode->tv_margins.left = margin;
1649 } else if (!strncmp(option, "margin_top", delim - option)) {
1650 if (drm_mode_parse_cmdline_int(delim, &margin))
1651 return -EINVAL;
1652
1653 mode->tv_margins.top = margin;
1654 } else if (!strncmp(option, "margin_bottom", delim - option)) {
1655 if (drm_mode_parse_cmdline_int(delim, &margin))
1656 return -EINVAL;
1657
1658 mode->tv_margins.bottom = margin;
1659 } else if (!strncmp(option, "panel_orientation", delim - option)) {
1660 if (drm_mode_parse_panel_orientation(delim, mode))
1661 return -EINVAL;
1662 } else {
1663 return -EINVAL;
1664 }
1665 sep = strchr(delim, ',');
1666 option = sep + 1;
1667 } while (sep);
1668
1669 if (rotation && freestanding)
1670 return -EINVAL;
1671
1672 if (!(rotation & DRM_MODE_ROTATE_MASK))
1673 rotation |= DRM_MODE_ROTATE_0;
1674
1675 /* Make sure there is exactly one rotation defined */
1676 if (!is_power_of_2(rotation & DRM_MODE_ROTATE_MASK))
1677 return -EINVAL;
1678
1679 mode->rotation_reflection = rotation;
1680
1681 return 0;
1682 }
1683
1684 static const char * const drm_named_modes_whitelist[] = {
1685 "NTSC",
1686 "PAL",
1687 };
1688
1689 /**
1690 * drm_mode_parse_command_line_for_connector - parse command line modeline for connector
1691 * @mode_option: optional per connector mode option
1692 * @connector: connector to parse modeline for
1693 * @mode: preallocated drm_cmdline_mode structure to fill out
1694 *
1695 * This parses @mode_option command line modeline for modes and options to
1696 * configure the connector. If @mode_option is NULL the default command line
1697 * modeline in fb_mode_option will be parsed instead.
1698 *
1699 * This uses the same parameters as the fb modedb.c, except for an extra
1700 * force-enable, force-enable-digital and force-disable bit at the end::
1701 *
1702 * <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
1703 *
1704 * Additionals options can be provided following the mode, using a comma to
1705 * separate each option. Valid options can be found in
1706 * Documentation/fb/modedb.rst.
1707 *
1708 * The intermediate drm_cmdline_mode structure is required to store additional
1709 * options from the command line modline like the force-enable/disable flag.
1710 *
1711 * Returns:
1712 * True if a valid modeline has been parsed, false otherwise.
1713 */
drm_mode_parse_command_line_for_connector(const char * mode_option,const struct drm_connector * connector,struct drm_cmdline_mode * mode)1714 bool drm_mode_parse_command_line_for_connector(const char *mode_option,
1715 const struct drm_connector *connector,
1716 struct drm_cmdline_mode *mode)
1717 {
1718 const char *name;
1719 bool freestanding = false, parse_extras = false;
1720 unsigned int bpp_off = 0, refresh_off = 0, options_off = 0;
1721 unsigned int mode_end = 0;
1722 const char *bpp_ptr = NULL, *refresh_ptr = NULL, *extra_ptr = NULL;
1723 const char *options_ptr = NULL;
1724 char *bpp_end_ptr = NULL, *refresh_end_ptr = NULL;
1725 int i, len, ret;
1726
1727 memset(mode, 0, sizeof(*mode));
1728 mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
1729
1730 if (!mode_option)
1731 return false;
1732
1733 name = mode_option;
1734
1735 /* Try to locate the bpp and refresh specifiers, if any */
1736 bpp_ptr = strchr(name, '-');
1737 if (bpp_ptr)
1738 bpp_off = bpp_ptr - name;
1739
1740 refresh_ptr = strchr(name, '@');
1741 if (refresh_ptr)
1742 refresh_off = refresh_ptr - name;
1743
1744 /* Locate the start of named options */
1745 options_ptr = strchr(name, ',');
1746 if (options_ptr)
1747 options_off = options_ptr - name;
1748
1749 /* Locate the end of the name / resolution, and parse it */
1750 if (bpp_ptr) {
1751 mode_end = bpp_off;
1752 } else if (refresh_ptr) {
1753 mode_end = refresh_off;
1754 } else if (options_ptr) {
1755 mode_end = options_off;
1756 parse_extras = true;
1757 } else {
1758 mode_end = strlen(name);
1759 parse_extras = true;
1760 }
1761
1762 /* First check for a named mode */
1763 for (i = 0; i < ARRAY_SIZE(drm_named_modes_whitelist); i++) {
1764 ret = str_has_prefix(name, drm_named_modes_whitelist[i]);
1765 if (ret == mode_end) {
1766 if (refresh_ptr)
1767 return false; /* named + refresh is invalid */
1768
1769 strcpy(mode->name, drm_named_modes_whitelist[i]);
1770 mode->specified = true;
1771 break;
1772 }
1773 }
1774
1775 /* No named mode? Check for a normal mode argument, e.g. 1024x768 */
1776 if (!mode->specified && isdigit(name[0])) {
1777 ret = drm_mode_parse_cmdline_res_mode(name, mode_end,
1778 parse_extras,
1779 connector,
1780 mode);
1781 if (ret)
1782 return false;
1783
1784 mode->specified = true;
1785 }
1786
1787 /* No mode? Check for freestanding extras and/or options */
1788 if (!mode->specified) {
1789 unsigned int len = strlen(mode_option);
1790
1791 if (bpp_ptr || refresh_ptr)
1792 return false; /* syntax error */
1793
1794 if (len == 1 || (len >= 2 && mode_option[1] == ','))
1795 extra_ptr = mode_option;
1796 else
1797 options_ptr = mode_option - 1;
1798
1799 freestanding = true;
1800 }
1801
1802 if (bpp_ptr) {
1803 ret = drm_mode_parse_cmdline_bpp(bpp_ptr, &bpp_end_ptr, mode);
1804 if (ret)
1805 return false;
1806
1807 mode->bpp_specified = true;
1808 }
1809
1810 if (refresh_ptr) {
1811 ret = drm_mode_parse_cmdline_refresh(refresh_ptr,
1812 &refresh_end_ptr, mode);
1813 if (ret)
1814 return false;
1815
1816 mode->refresh_specified = true;
1817 }
1818
1819 /*
1820 * Locate the end of the bpp / refresh, and parse the extras
1821 * if relevant
1822 */
1823 if (bpp_ptr && refresh_ptr)
1824 extra_ptr = max(bpp_end_ptr, refresh_end_ptr);
1825 else if (bpp_ptr)
1826 extra_ptr = bpp_end_ptr;
1827 else if (refresh_ptr)
1828 extra_ptr = refresh_end_ptr;
1829
1830 if (extra_ptr) {
1831 if (options_ptr)
1832 len = options_ptr - extra_ptr;
1833 else
1834 len = strlen(extra_ptr);
1835
1836 ret = drm_mode_parse_cmdline_extra(extra_ptr, len, freestanding,
1837 connector, mode);
1838 if (ret)
1839 return false;
1840 }
1841
1842 if (options_ptr) {
1843 ret = drm_mode_parse_cmdline_options(options_ptr + 1,
1844 freestanding,
1845 connector, mode);
1846 if (ret)
1847 return false;
1848 }
1849
1850 return true;
1851 }
1852 EXPORT_SYMBOL(drm_mode_parse_command_line_for_connector);
1853
1854 /**
1855 * drm_mode_create_from_cmdline_mode - convert a command line modeline into a DRM display mode
1856 * @dev: DRM device to create the new mode for
1857 * @cmd: input command line modeline
1858 *
1859 * Returns:
1860 * Pointer to converted mode on success, NULL on error.
1861 */
1862 struct drm_display_mode *
drm_mode_create_from_cmdline_mode(struct drm_device * dev,struct drm_cmdline_mode * cmd)1863 drm_mode_create_from_cmdline_mode(struct drm_device *dev,
1864 struct drm_cmdline_mode *cmd)
1865 {
1866 struct drm_display_mode *mode;
1867
1868 if (cmd->cvt)
1869 mode = drm_cvt_mode(dev,
1870 cmd->xres, cmd->yres,
1871 cmd->refresh_specified ? cmd->refresh : 60,
1872 cmd->rb, cmd->interlace,
1873 cmd->margins);
1874 else
1875 mode = drm_gtf_mode(dev,
1876 cmd->xres, cmd->yres,
1877 cmd->refresh_specified ? cmd->refresh : 60,
1878 cmd->interlace,
1879 cmd->margins);
1880 if (!mode)
1881 return NULL;
1882
1883 mode->type |= DRM_MODE_TYPE_USERDEF;
1884 /* fix up 1368x768: GFT/CVT can't express 1366 width due to alignment */
1885 if (cmd->xres == 1366)
1886 drm_mode_fixup_1366x768(mode);
1887 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
1888 return mode;
1889 }
1890 EXPORT_SYMBOL(drm_mode_create_from_cmdline_mode);
1891
1892 /**
1893 * drm_crtc_convert_to_umode - convert a drm_display_mode into a modeinfo
1894 * @out: drm_mode_modeinfo struct to return to the user
1895 * @in: drm_display_mode to use
1896 *
1897 * Convert a drm_display_mode into a drm_mode_modeinfo structure to return to
1898 * the user.
1899 */
drm_mode_convert_to_umode(struct drm_mode_modeinfo * out,const struct drm_display_mode * in)1900 void drm_mode_convert_to_umode(struct drm_mode_modeinfo *out,
1901 const struct drm_display_mode *in)
1902 {
1903 out->clock = in->clock;
1904 out->hdisplay = in->hdisplay;
1905 out->hsync_start = in->hsync_start;
1906 out->hsync_end = in->hsync_end;
1907 out->htotal = in->htotal;
1908 out->hskew = in->hskew;
1909 out->vdisplay = in->vdisplay;
1910 out->vsync_start = in->vsync_start;
1911 out->vsync_end = in->vsync_end;
1912 out->vtotal = in->vtotal;
1913 out->vscan = in->vscan;
1914 out->vrefresh = drm_mode_vrefresh(in);
1915 out->flags = in->flags;
1916 out->type = in->type;
1917
1918 switch (in->picture_aspect_ratio) {
1919 case HDMI_PICTURE_ASPECT_4_3:
1920 out->flags |= DRM_MODE_FLAG_PIC_AR_4_3;
1921 break;
1922 case HDMI_PICTURE_ASPECT_16_9:
1923 out->flags |= DRM_MODE_FLAG_PIC_AR_16_9;
1924 break;
1925 case HDMI_PICTURE_ASPECT_64_27:
1926 out->flags |= DRM_MODE_FLAG_PIC_AR_64_27;
1927 break;
1928 case HDMI_PICTURE_ASPECT_256_135:
1929 out->flags |= DRM_MODE_FLAG_PIC_AR_256_135;
1930 break;
1931 default:
1932 WARN(1, "Invalid aspect ratio (0%x) on mode\n",
1933 in->picture_aspect_ratio);
1934 fallthrough;
1935 case HDMI_PICTURE_ASPECT_NONE:
1936 out->flags |= DRM_MODE_FLAG_PIC_AR_NONE;
1937 break;
1938 }
1939
1940 strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
1941 out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
1942 }
1943 EXPORT_SYMBOL_GPL(drm_mode_convert_to_umode);
1944
1945 /**
1946 * drm_crtc_convert_umode - convert a modeinfo into a drm_display_mode
1947 * @dev: drm device
1948 * @out: drm_display_mode to return to the user
1949 * @in: drm_mode_modeinfo to use
1950 *
1951 * Convert a drm_mode_modeinfo into a drm_display_mode structure to return to
1952 * the caller.
1953 *
1954 * Returns:
1955 * Zero on success, negative errno on failure.
1956 */
drm_mode_convert_umode(struct drm_device * dev,struct drm_display_mode * out,const struct drm_mode_modeinfo * in)1957 int drm_mode_convert_umode(struct drm_device *dev,
1958 struct drm_display_mode *out,
1959 const struct drm_mode_modeinfo *in)
1960 {
1961 if (in->clock > INT_MAX || in->vrefresh > INT_MAX)
1962 return -ERANGE;
1963
1964 out->clock = in->clock;
1965 out->hdisplay = in->hdisplay;
1966 out->hsync_start = in->hsync_start;
1967 out->hsync_end = in->hsync_end;
1968 out->htotal = in->htotal;
1969 out->hskew = in->hskew;
1970 out->vdisplay = in->vdisplay;
1971 out->vsync_start = in->vsync_start;
1972 out->vsync_end = in->vsync_end;
1973 out->vtotal = in->vtotal;
1974 out->vscan = in->vscan;
1975 out->flags = in->flags;
1976 /*
1977 * Old xf86-video-vmware (possibly others too) used to
1978 * leave 'type' unititialized. Just ignore any bits we
1979 * don't like. It's a just hint after all, and more
1980 * useful for the kernel->userspace direction anyway.
1981 */
1982 out->type = in->type & DRM_MODE_TYPE_ALL;
1983 strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
1984 out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
1985
1986 /* Clearing picture aspect ratio bits from out flags,
1987 * as the aspect-ratio information is not stored in
1988 * flags for kernel-mode, but in picture_aspect_ratio.
1989 */
1990 out->flags &= ~DRM_MODE_FLAG_PIC_AR_MASK;
1991
1992 switch (in->flags & DRM_MODE_FLAG_PIC_AR_MASK) {
1993 case DRM_MODE_FLAG_PIC_AR_4_3:
1994 out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_4_3;
1995 break;
1996 case DRM_MODE_FLAG_PIC_AR_16_9:
1997 out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_16_9;
1998 break;
1999 case DRM_MODE_FLAG_PIC_AR_64_27:
2000 out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_64_27;
2001 break;
2002 case DRM_MODE_FLAG_PIC_AR_256_135:
2003 out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_256_135;
2004 break;
2005 case DRM_MODE_FLAG_PIC_AR_NONE:
2006 out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_NONE;
2007 break;
2008 default:
2009 return -EINVAL;
2010 }
2011
2012 out->status = drm_mode_validate_driver(dev, out);
2013 if (out->status != MODE_OK)
2014 return -EINVAL;
2015
2016 drm_mode_set_crtcinfo(out, CRTC_INTERLACE_HALVE_V);
2017
2018 return 0;
2019 }
2020 EXPORT_SYMBOL_GPL(drm_mode_convert_umode);
2021
2022 /**
2023 * drm_mode_is_420_only - if a given videomode can be only supported in YCBCR420
2024 * output format
2025 *
2026 * @display: display under action
2027 * @mode: video mode to be tested.
2028 *
2029 * Returns:
2030 * true if the mode can be supported in YCBCR420 format
2031 * false if not.
2032 */
drm_mode_is_420_only(const struct drm_display_info * display,const struct drm_display_mode * mode)2033 bool drm_mode_is_420_only(const struct drm_display_info *display,
2034 const struct drm_display_mode *mode)
2035 {
2036 u8 vic = drm_match_cea_mode(mode);
2037
2038 return test_bit(vic, display->hdmi.y420_vdb_modes);
2039 }
2040 EXPORT_SYMBOL(drm_mode_is_420_only);
2041
2042 /**
2043 * drm_mode_is_420_also - if a given videomode can be supported in YCBCR420
2044 * output format also (along with RGB/YCBCR444/422)
2045 *
2046 * @display: display under action.
2047 * @mode: video mode to be tested.
2048 *
2049 * Returns:
2050 * true if the mode can be support YCBCR420 format
2051 * false if not.
2052 */
drm_mode_is_420_also(const struct drm_display_info * display,const struct drm_display_mode * mode)2053 bool drm_mode_is_420_also(const struct drm_display_info *display,
2054 const struct drm_display_mode *mode)
2055 {
2056 u8 vic = drm_match_cea_mode(mode);
2057
2058 return test_bit(vic, display->hdmi.y420_cmdb_modes);
2059 }
2060 EXPORT_SYMBOL(drm_mode_is_420_also);
2061 /**
2062 * drm_mode_is_420 - if a given videomode can be supported in YCBCR420
2063 * output format
2064 *
2065 * @display: display under action.
2066 * @mode: video mode to be tested.
2067 *
2068 * Returns:
2069 * true if the mode can be supported in YCBCR420 format
2070 * false if not.
2071 */
drm_mode_is_420(const struct drm_display_info * display,const struct drm_display_mode * mode)2072 bool drm_mode_is_420(const struct drm_display_info *display,
2073 const struct drm_display_mode *mode)
2074 {
2075 return drm_mode_is_420_only(display, mode) ||
2076 drm_mode_is_420_also(display, mode);
2077 }
2078 EXPORT_SYMBOL(drm_mode_is_420);
2079