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