1 /*
2  * Copyright © 1997-2003 by The XFree86 Project, Inc.
3  * Copyright © 2007 Dave Airlie
4  * Copyright © 2007-2008 Intel Corporation
5  *   Jesse Barnes <jesse.barnes@intel.com>
6  * Copyright 2005-2006 Luc Verhaegen
7  * Copyright (c) 2001, Andy Ritger  aritger@nvidia.com
8  *
9  * Permission is hereby granted, free of charge, to any person obtaining a
10  * copy of this software and associated documentation files (the "Software"),
11  * to deal in the Software without restriction, including without limitation
12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13  * and/or sell copies of the Software, and to permit persons to whom the
14  * Software is furnished to do so, subject to the following conditions:
15  *
16  * The above copyright notice and this permission notice shall be included in
17  * all copies or substantial portions of the Software.
18  *
19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
22  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
23  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
24  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
25  * OTHER DEALINGS IN THE SOFTWARE.
26  *
27  * Except as contained in this notice, the name of the copyright holder(s)
28  * and author(s) shall not be used in advertising or otherwise to promote
29  * the sale, use or other dealings in this Software without prior written
30  * authorization from the copyright holder(s) and author(s).
31  */
32 
33 #include <linux/list.h>
34 #include <linux/list_sort.h>
35 #include <linux/export.h>
36 #include <drm/drmP.h>
37 #include <drm/drm_crtc.h>
38 #include <video/of_videomode.h>
39 #include <video/videomode.h>
40 #include <drm/drm_modes.h>
41 
42 #include "drm_crtc_internal.h"
43 
44 /**
45  * drm_mode_debug_printmodeline - print a mode to dmesg
46  * @mode: mode to print
47  *
48  * Describe @mode using DRM_DEBUG.
49  */
drm_mode_debug_printmodeline(const struct drm_display_mode * mode)50 void drm_mode_debug_printmodeline(const struct drm_display_mode *mode)
51 {
52 	DRM_DEBUG_KMS("Modeline " DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
53 }
54 EXPORT_SYMBOL(drm_mode_debug_printmodeline);
55 
56 /**
57  * drm_mode_create - create a new display mode
58  * @dev: DRM device
59  *
60  * Create a new, cleared drm_display_mode with kzalloc, allocate an ID for it
61  * and return it.
62  *
63  * Returns:
64  * Pointer to new mode on success, NULL on error.
65  */
drm_mode_create(struct drm_device * dev)66 struct drm_display_mode *drm_mode_create(struct drm_device *dev)
67 {
68 	struct drm_display_mode *nmode;
69 
70 	nmode = kzalloc(sizeof(struct drm_display_mode), GFP_KERNEL);
71 	if (!nmode)
72 		return NULL;
73 
74 	if (drm_mode_object_add(dev, &nmode->base, DRM_MODE_OBJECT_MODE)) {
75 		kfree(nmode);
76 		return NULL;
77 	}
78 
79 	return nmode;
80 }
81 EXPORT_SYMBOL(drm_mode_create);
82 
83 /**
84  * drm_mode_destroy - remove a mode
85  * @dev: DRM device
86  * @mode: mode to remove
87  *
88  * Release @mode's unique ID, then free it @mode structure itself using kfree.
89  */
drm_mode_destroy(struct drm_device * dev,struct drm_display_mode * mode)90 void drm_mode_destroy(struct drm_device *dev, struct drm_display_mode *mode)
91 {
92 	if (!mode)
93 		return;
94 
95 	drm_mode_object_unregister(dev, &mode->base);
96 
97 	kfree(mode);
98 }
99 EXPORT_SYMBOL(drm_mode_destroy);
100 
101 /**
102  * drm_mode_probed_add - add a mode to a connector's probed_mode list
103  * @connector: connector the new mode
104  * @mode: mode data
105  *
106  * Add @mode to @connector's probed_mode list for later use. This list should
107  * then in a second step get filtered and all the modes actually supported by
108  * the hardware moved to the @connector's modes list.
109  */
drm_mode_probed_add(struct drm_connector * connector,struct drm_display_mode * mode)110 void drm_mode_probed_add(struct drm_connector *connector,
111 			 struct drm_display_mode *mode)
112 {
113 	WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
114 
115 	list_add_tail(&mode->head, &connector->probed_modes);
116 }
117 EXPORT_SYMBOL(drm_mode_probed_add);
118 
119 /**
120  * drm_cvt_mode -create a modeline based on the CVT algorithm
121  * @dev: drm device
122  * @hdisplay: hdisplay size
123  * @vdisplay: vdisplay size
124  * @vrefresh: vrefresh rate
125  * @reduced: whether to use reduced blanking
126  * @interlaced: whether to compute an interlaced mode
127  * @margins: whether to add margins (borders)
128  *
129  * This function is called to generate the modeline based on CVT algorithm
130  * according to the hdisplay, vdisplay, vrefresh.
131  * It is based from the VESA(TM) Coordinated Video Timing Generator by
132  * Graham Loveridge April 9, 2003 available at
133  * http://www.elo.utfsm.cl/~elo212/docs/CVTd6r1.xls
134  *
135  * And it is copied from xf86CVTmode in xserver/hw/xfree86/modes/xf86cvt.c.
136  * What I have done is to translate it by using integer calculation.
137  *
138  * Returns:
139  * The modeline based on the CVT algorithm stored in a drm_display_mode object.
140  * The display mode object is allocated with drm_mode_create(). Returns NULL
141  * when no mode could be allocated.
142  */
drm_cvt_mode(struct drm_device * dev,int hdisplay,int vdisplay,int vrefresh,bool reduced,bool interlaced,bool margins)143 struct drm_display_mode *drm_cvt_mode(struct drm_device *dev, int hdisplay,
144 				      int vdisplay, int vrefresh,
145 				      bool reduced, bool interlaced, bool margins)
146 {
147 #define HV_FACTOR			1000
148 	/* 1) top/bottom margin size (% of height) - default: 1.8, */
149 #define	CVT_MARGIN_PERCENTAGE		18
150 	/* 2) character cell horizontal granularity (pixels) - default 8 */
151 #define	CVT_H_GRANULARITY		8
152 	/* 3) Minimum vertical porch (lines) - default 3 */
153 #define	CVT_MIN_V_PORCH			3
154 	/* 4) Minimum number of vertical back porch lines - default 6 */
155 #define	CVT_MIN_V_BPORCH		6
156 	/* Pixel Clock step (kHz) */
157 #define CVT_CLOCK_STEP			250
158 	struct drm_display_mode *drm_mode;
159 	unsigned int vfieldrate, hperiod;
160 	int hdisplay_rnd, hmargin, vdisplay_rnd, vmargin, vsync;
161 	int interlace;
162 	u64 tmp;
163 
164 	/* allocate the drm_display_mode structure. If failure, we will
165 	 * return directly
166 	 */
167 	drm_mode = drm_mode_create(dev);
168 	if (!drm_mode)
169 		return NULL;
170 
171 	/* the CVT default refresh rate is 60Hz */
172 	if (!vrefresh)
173 		vrefresh = 60;
174 
175 	/* the required field fresh rate */
176 	if (interlaced)
177 		vfieldrate = vrefresh * 2;
178 	else
179 		vfieldrate = vrefresh;
180 
181 	/* horizontal pixels */
182 	hdisplay_rnd = hdisplay - (hdisplay % CVT_H_GRANULARITY);
183 
184 	/* determine the left&right borders */
185 	hmargin = 0;
186 	if (margins) {
187 		hmargin = hdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
188 		hmargin -= hmargin % CVT_H_GRANULARITY;
189 	}
190 	/* find the total active pixels */
191 	drm_mode->hdisplay = hdisplay_rnd + 2 * hmargin;
192 
193 	/* find the number of lines per field */
194 	if (interlaced)
195 		vdisplay_rnd = vdisplay / 2;
196 	else
197 		vdisplay_rnd = vdisplay;
198 
199 	/* find the top & bottom borders */
200 	vmargin = 0;
201 	if (margins)
202 		vmargin = vdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
203 
204 	drm_mode->vdisplay = vdisplay + 2 * vmargin;
205 
206 	/* Interlaced */
207 	if (interlaced)
208 		interlace = 1;
209 	else
210 		interlace = 0;
211 
212 	/* Determine VSync Width from aspect ratio */
213 	if (!(vdisplay % 3) && ((vdisplay * 4 / 3) == hdisplay))
214 		vsync = 4;
215 	else if (!(vdisplay % 9) && ((vdisplay * 16 / 9) == hdisplay))
216 		vsync = 5;
217 	else if (!(vdisplay % 10) && ((vdisplay * 16 / 10) == hdisplay))
218 		vsync = 6;
219 	else if (!(vdisplay % 4) && ((vdisplay * 5 / 4) == hdisplay))
220 		vsync = 7;
221 	else if (!(vdisplay % 9) && ((vdisplay * 15 / 9) == hdisplay))
222 		vsync = 7;
223 	else /* custom */
224 		vsync = 10;
225 
226 	if (!reduced) {
227 		/* simplify the GTF calculation */
228 		/* 4) Minimum time of vertical sync + back porch interval (µs)
229 		 * default 550.0
230 		 */
231 		int tmp1, tmp2;
232 #define CVT_MIN_VSYNC_BP	550
233 		/* 3) Nominal HSync width (% of line period) - default 8 */
234 #define CVT_HSYNC_PERCENTAGE	8
235 		unsigned int hblank_percentage;
236 		int vsyncandback_porch, vback_porch, hblank;
237 
238 		/* estimated the horizontal period */
239 		tmp1 = HV_FACTOR * 1000000  -
240 				CVT_MIN_VSYNC_BP * HV_FACTOR * vfieldrate;
241 		tmp2 = (vdisplay_rnd + 2 * vmargin + CVT_MIN_V_PORCH) * 2 +
242 				interlace;
243 		hperiod = tmp1 * 2 / (tmp2 * vfieldrate);
244 
245 		tmp1 = CVT_MIN_VSYNC_BP * HV_FACTOR / hperiod + 1;
246 		/* 9. Find number of lines in sync + backporch */
247 		if (tmp1 < (vsync + CVT_MIN_V_PORCH))
248 			vsyncandback_porch = vsync + CVT_MIN_V_PORCH;
249 		else
250 			vsyncandback_porch = tmp1;
251 		/* 10. Find number of lines in back porch */
252 		vback_porch = vsyncandback_porch - vsync;
253 		drm_mode->vtotal = vdisplay_rnd + 2 * vmargin +
254 				vsyncandback_porch + CVT_MIN_V_PORCH;
255 		/* 5) Definition of Horizontal blanking time limitation */
256 		/* Gradient (%/kHz) - default 600 */
257 #define CVT_M_FACTOR	600
258 		/* Offset (%) - default 40 */
259 #define CVT_C_FACTOR	40
260 		/* Blanking time scaling factor - default 128 */
261 #define CVT_K_FACTOR	128
262 		/* Scaling factor weighting - default 20 */
263 #define CVT_J_FACTOR	20
264 #define CVT_M_PRIME	(CVT_M_FACTOR * CVT_K_FACTOR / 256)
265 #define CVT_C_PRIME	((CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + \
266 			 CVT_J_FACTOR)
267 		/* 12. Find ideal blanking duty cycle from formula */
268 		hblank_percentage = CVT_C_PRIME * HV_FACTOR - CVT_M_PRIME *
269 					hperiod / 1000;
270 		/* 13. Blanking time */
271 		if (hblank_percentage < 20 * HV_FACTOR)
272 			hblank_percentage = 20 * HV_FACTOR;
273 		hblank = drm_mode->hdisplay * hblank_percentage /
274 			 (100 * HV_FACTOR - hblank_percentage);
275 		hblank -= hblank % (2 * CVT_H_GRANULARITY);
276 		/* 14. find the total pixels per line */
277 		drm_mode->htotal = drm_mode->hdisplay + hblank;
278 		drm_mode->hsync_end = drm_mode->hdisplay + hblank / 2;
279 		drm_mode->hsync_start = drm_mode->hsync_end -
280 			(drm_mode->htotal * CVT_HSYNC_PERCENTAGE) / 100;
281 		drm_mode->hsync_start += CVT_H_GRANULARITY -
282 			drm_mode->hsync_start % CVT_H_GRANULARITY;
283 		/* fill the Vsync values */
284 		drm_mode->vsync_start = drm_mode->vdisplay + CVT_MIN_V_PORCH;
285 		drm_mode->vsync_end = drm_mode->vsync_start + vsync;
286 	} else {
287 		/* Reduced blanking */
288 		/* Minimum vertical blanking interval time (µs)- default 460 */
289 #define CVT_RB_MIN_VBLANK	460
290 		/* Fixed number of clocks for horizontal sync */
291 #define CVT_RB_H_SYNC		32
292 		/* Fixed number of clocks for horizontal blanking */
293 #define CVT_RB_H_BLANK		160
294 		/* Fixed number of lines for vertical front porch - default 3*/
295 #define CVT_RB_VFPORCH		3
296 		int vbilines;
297 		int tmp1, tmp2;
298 		/* 8. Estimate Horizontal period. */
299 		tmp1 = HV_FACTOR * 1000000 -
300 			CVT_RB_MIN_VBLANK * HV_FACTOR * vfieldrate;
301 		tmp2 = vdisplay_rnd + 2 * vmargin;
302 		hperiod = tmp1 / (tmp2 * vfieldrate);
303 		/* 9. Find number of lines in vertical blanking */
304 		vbilines = CVT_RB_MIN_VBLANK * HV_FACTOR / hperiod + 1;
305 		/* 10. Check if vertical blanking is sufficient */
306 		if (vbilines < (CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH))
307 			vbilines = CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH;
308 		/* 11. Find total number of lines in vertical field */
309 		drm_mode->vtotal = vdisplay_rnd + 2 * vmargin + vbilines;
310 		/* 12. Find total number of pixels in a line */
311 		drm_mode->htotal = drm_mode->hdisplay + CVT_RB_H_BLANK;
312 		/* Fill in HSync values */
313 		drm_mode->hsync_end = drm_mode->hdisplay + CVT_RB_H_BLANK / 2;
314 		drm_mode->hsync_start = drm_mode->hsync_end - CVT_RB_H_SYNC;
315 		/* Fill in VSync values */
316 		drm_mode->vsync_start = drm_mode->vdisplay + CVT_RB_VFPORCH;
317 		drm_mode->vsync_end = drm_mode->vsync_start + vsync;
318 	}
319 	/* 15/13. Find pixel clock frequency (kHz for xf86) */
320 	tmp = drm_mode->htotal; /* perform intermediate calcs in u64 */
321 	tmp *= HV_FACTOR * 1000;
322 	do_div(tmp, hperiod);
323 	tmp -= drm_mode->clock % CVT_CLOCK_STEP;
324 	drm_mode->clock = tmp;
325 	/* 18/16. Find actual vertical frame frequency */
326 	/* ignore - just set the mode flag for interlaced */
327 	if (interlaced) {
328 		drm_mode->vtotal *= 2;
329 		drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
330 	}
331 	/* Fill the mode line name */
332 	drm_mode_set_name(drm_mode);
333 	if (reduced)
334 		drm_mode->flags |= (DRM_MODE_FLAG_PHSYNC |
335 					DRM_MODE_FLAG_NVSYNC);
336 	else
337 		drm_mode->flags |= (DRM_MODE_FLAG_PVSYNC |
338 					DRM_MODE_FLAG_NHSYNC);
339 
340 	return drm_mode;
341 }
342 EXPORT_SYMBOL(drm_cvt_mode);
343 
344 /**
345  * drm_gtf_mode_complex - create the modeline based on the full GTF algorithm
346  * @dev: drm device
347  * @hdisplay: hdisplay size
348  * @vdisplay: vdisplay size
349  * @vrefresh: vrefresh rate.
350  * @interlaced: whether to compute an interlaced mode
351  * @margins: desired margin (borders) size
352  * @GTF_M: extended GTF formula parameters
353  * @GTF_2C: extended GTF formula parameters
354  * @GTF_K: extended GTF formula parameters
355  * @GTF_2J: extended GTF formula parameters
356  *
357  * GTF feature blocks specify C and J in multiples of 0.5, so we pass them
358  * in here multiplied by two.  For a C of 40, pass in 80.
359  *
360  * Returns:
361  * The modeline based on the full GTF algorithm stored in a drm_display_mode object.
362  * The display mode object is allocated with drm_mode_create(). Returns NULL
363  * when no mode could be allocated.
364  */
365 struct drm_display_mode *
drm_gtf_mode_complex(struct drm_device * dev,int hdisplay,int vdisplay,int vrefresh,bool interlaced,int margins,int GTF_M,int GTF_2C,int GTF_K,int GTF_2J)366 drm_gtf_mode_complex(struct drm_device *dev, int hdisplay, int vdisplay,
367 		     int vrefresh, bool interlaced, int margins,
368 		     int GTF_M, int GTF_2C, int GTF_K, int GTF_2J)
369 {	/* 1) top/bottom margin size (% of height) - default: 1.8, */
370 #define	GTF_MARGIN_PERCENTAGE		18
371 	/* 2) character cell horizontal granularity (pixels) - default 8 */
372 #define	GTF_CELL_GRAN			8
373 	/* 3) Minimum vertical porch (lines) - default 3 */
374 #define	GTF_MIN_V_PORCH			1
375 	/* width of vsync in lines */
376 #define V_SYNC_RQD			3
377 	/* width of hsync as % of total line */
378 #define H_SYNC_PERCENT			8
379 	/* min time of vsync + back porch (microsec) */
380 #define MIN_VSYNC_PLUS_BP		550
381 	/* C' and M' are part of the Blanking Duty Cycle computation */
382 #define GTF_C_PRIME	((((GTF_2C - GTF_2J) * GTF_K / 256) + GTF_2J) / 2)
383 #define GTF_M_PRIME	(GTF_K * GTF_M / 256)
384 	struct drm_display_mode *drm_mode;
385 	unsigned int hdisplay_rnd, vdisplay_rnd, vfieldrate_rqd;
386 	int top_margin, bottom_margin;
387 	int interlace;
388 	unsigned int hfreq_est;
389 	int vsync_plus_bp, vback_porch;
390 	unsigned int vtotal_lines, vfieldrate_est, hperiod;
391 	unsigned int vfield_rate, vframe_rate;
392 	int left_margin, right_margin;
393 	unsigned int total_active_pixels, ideal_duty_cycle;
394 	unsigned int hblank, total_pixels, pixel_freq;
395 	int hsync, hfront_porch, vodd_front_porch_lines;
396 	unsigned int tmp1, tmp2;
397 
398 	drm_mode = drm_mode_create(dev);
399 	if (!drm_mode)
400 		return NULL;
401 
402 	/* 1. In order to give correct results, the number of horizontal
403 	 * pixels requested is first processed to ensure that it is divisible
404 	 * by the character size, by rounding it to the nearest character
405 	 * cell boundary:
406 	 */
407 	hdisplay_rnd = (hdisplay + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
408 	hdisplay_rnd = hdisplay_rnd * GTF_CELL_GRAN;
409 
410 	/* 2. If interlace is requested, the number of vertical lines assumed
411 	 * by the calculation must be halved, as the computation calculates
412 	 * the number of vertical lines per field.
413 	 */
414 	if (interlaced)
415 		vdisplay_rnd = vdisplay / 2;
416 	else
417 		vdisplay_rnd = vdisplay;
418 
419 	/* 3. Find the frame rate required: */
420 	if (interlaced)
421 		vfieldrate_rqd = vrefresh * 2;
422 	else
423 		vfieldrate_rqd = vrefresh;
424 
425 	/* 4. Find number of lines in Top margin: */
426 	top_margin = 0;
427 	if (margins)
428 		top_margin = (vdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
429 				1000;
430 	/* 5. Find number of lines in bottom margin: */
431 	bottom_margin = top_margin;
432 
433 	/* 6. If interlace is required, then set variable interlace: */
434 	if (interlaced)
435 		interlace = 1;
436 	else
437 		interlace = 0;
438 
439 	/* 7. Estimate the Horizontal frequency */
440 	{
441 		tmp1 = (1000000  - MIN_VSYNC_PLUS_BP * vfieldrate_rqd) / 500;
442 		tmp2 = (vdisplay_rnd + 2 * top_margin + GTF_MIN_V_PORCH) *
443 				2 + interlace;
444 		hfreq_est = (tmp2 * 1000 * vfieldrate_rqd) / tmp1;
445 	}
446 
447 	/* 8. Find the number of lines in V sync + back porch */
448 	/* [V SYNC+BP] = RINT(([MIN VSYNC+BP] * hfreq_est / 1000000)) */
449 	vsync_plus_bp = MIN_VSYNC_PLUS_BP * hfreq_est / 1000;
450 	vsync_plus_bp = (vsync_plus_bp + 500) / 1000;
451 	/*  9. Find the number of lines in V back porch alone: */
452 	vback_porch = vsync_plus_bp - V_SYNC_RQD;
453 	/*  10. Find the total number of lines in Vertical field period: */
454 	vtotal_lines = vdisplay_rnd + top_margin + bottom_margin +
455 			vsync_plus_bp + GTF_MIN_V_PORCH;
456 	/*  11. Estimate the Vertical field frequency: */
457 	vfieldrate_est = hfreq_est / vtotal_lines;
458 	/*  12. Find the actual horizontal period: */
459 	hperiod = 1000000 / (vfieldrate_rqd * vtotal_lines);
460 
461 	/*  13. Find the actual Vertical field frequency: */
462 	vfield_rate = hfreq_est / vtotal_lines;
463 	/*  14. Find the Vertical frame frequency: */
464 	if (interlaced)
465 		vframe_rate = vfield_rate / 2;
466 	else
467 		vframe_rate = vfield_rate;
468 	/*  15. Find number of pixels in left margin: */
469 	if (margins)
470 		left_margin = (hdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
471 				1000;
472 	else
473 		left_margin = 0;
474 
475 	/* 16.Find number of pixels in right margin: */
476 	right_margin = left_margin;
477 	/* 17.Find total number of active pixels in image and left and right */
478 	total_active_pixels = hdisplay_rnd + left_margin + right_margin;
479 	/* 18.Find the ideal blanking duty cycle from blanking duty cycle */
480 	ideal_duty_cycle = GTF_C_PRIME * 1000 -
481 				(GTF_M_PRIME * 1000000 / hfreq_est);
482 	/* 19.Find the number of pixels in the blanking time to the nearest
483 	 * double character cell: */
484 	hblank = total_active_pixels * ideal_duty_cycle /
485 			(100000 - ideal_duty_cycle);
486 	hblank = (hblank + GTF_CELL_GRAN) / (2 * GTF_CELL_GRAN);
487 	hblank = hblank * 2 * GTF_CELL_GRAN;
488 	/* 20.Find total number of pixels: */
489 	total_pixels = total_active_pixels + hblank;
490 	/* 21.Find pixel clock frequency: */
491 	pixel_freq = total_pixels * hfreq_est / 1000;
492 	/* Stage 1 computations are now complete; I should really pass
493 	 * the results to another function and do the Stage 2 computations,
494 	 * but I only need a few more values so I'll just append the
495 	 * computations here for now */
496 	/* 17. Find the number of pixels in the horizontal sync period: */
497 	hsync = H_SYNC_PERCENT * total_pixels / 100;
498 	hsync = (hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
499 	hsync = hsync * GTF_CELL_GRAN;
500 	/* 18. Find the number of pixels in horizontal front porch period */
501 	hfront_porch = hblank / 2 - hsync;
502 	/*  36. Find the number of lines in the odd front porch period: */
503 	vodd_front_porch_lines = GTF_MIN_V_PORCH ;
504 
505 	/* finally, pack the results in the mode struct */
506 	drm_mode->hdisplay = hdisplay_rnd;
507 	drm_mode->hsync_start = hdisplay_rnd + hfront_porch;
508 	drm_mode->hsync_end = drm_mode->hsync_start + hsync;
509 	drm_mode->htotal = total_pixels;
510 	drm_mode->vdisplay = vdisplay_rnd;
511 	drm_mode->vsync_start = vdisplay_rnd + vodd_front_porch_lines;
512 	drm_mode->vsync_end = drm_mode->vsync_start + V_SYNC_RQD;
513 	drm_mode->vtotal = vtotal_lines;
514 
515 	drm_mode->clock = pixel_freq;
516 
517 	if (interlaced) {
518 		drm_mode->vtotal *= 2;
519 		drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
520 	}
521 
522 	drm_mode_set_name(drm_mode);
523 	if (GTF_M == 600 && GTF_2C == 80 && GTF_K == 128 && GTF_2J == 40)
524 		drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;
525 	else
526 		drm_mode->flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC;
527 
528 	return drm_mode;
529 }
530 EXPORT_SYMBOL(drm_gtf_mode_complex);
531 
532 /**
533  * drm_gtf_mode - create the modeline based on the GTF algorithm
534  * @dev: drm device
535  * @hdisplay: hdisplay size
536  * @vdisplay: vdisplay size
537  * @vrefresh: vrefresh rate.
538  * @interlaced: whether to compute an interlaced mode
539  * @margins: desired margin (borders) size
540  *
541  * return the modeline based on GTF algorithm
542  *
543  * This function is to create the modeline based on the GTF algorithm.
544  * Generalized Timing Formula is derived from:
545  *
546  *	GTF Spreadsheet by Andy Morrish (1/5/97)
547  *	available at http://www.vesa.org
548  *
549  * And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf.c.
550  * What I have done is to translate it by using integer calculation.
551  * I also refer to the function of fb_get_mode in the file of
552  * drivers/video/fbmon.c
553  *
554  * Standard GTF parameters::
555  *
556  *     M = 600
557  *     C = 40
558  *     K = 128
559  *     J = 20
560  *
561  * Returns:
562  * The modeline based on the GTF algorithm stored in a drm_display_mode object.
563  * The display mode object is allocated with drm_mode_create(). Returns NULL
564  * when no mode could be allocated.
565  */
566 struct drm_display_mode *
drm_gtf_mode(struct drm_device * dev,int hdisplay,int vdisplay,int vrefresh,bool interlaced,int margins)567 drm_gtf_mode(struct drm_device *dev, int hdisplay, int vdisplay, int vrefresh,
568 	     bool interlaced, int margins)
569 {
570 	return drm_gtf_mode_complex(dev, hdisplay, vdisplay, vrefresh,
571 				    interlaced, margins,
572 				    600, 40 * 2, 128, 20 * 2);
573 }
574 EXPORT_SYMBOL(drm_gtf_mode);
575 
576 #ifdef CONFIG_VIDEOMODE_HELPERS
577 /**
578  * drm_display_mode_from_videomode - fill in @dmode using @vm,
579  * @vm: videomode structure to use as source
580  * @dmode: drm_display_mode structure to use as destination
581  *
582  * Fills out @dmode using the display mode specified in @vm.
583  */
drm_display_mode_from_videomode(const struct videomode * vm,struct drm_display_mode * dmode)584 void drm_display_mode_from_videomode(const struct videomode *vm,
585 				     struct drm_display_mode *dmode)
586 {
587 	dmode->hdisplay = vm->hactive;
588 	dmode->hsync_start = dmode->hdisplay + vm->hfront_porch;
589 	dmode->hsync_end = dmode->hsync_start + vm->hsync_len;
590 	dmode->htotal = dmode->hsync_end + vm->hback_porch;
591 
592 	dmode->vdisplay = vm->vactive;
593 	dmode->vsync_start = dmode->vdisplay + vm->vfront_porch;
594 	dmode->vsync_end = dmode->vsync_start + vm->vsync_len;
595 	dmode->vtotal = dmode->vsync_end + vm->vback_porch;
596 
597 	dmode->clock = vm->pixelclock / 1000;
598 
599 	dmode->flags = 0;
600 	if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH)
601 		dmode->flags |= DRM_MODE_FLAG_PHSYNC;
602 	else if (vm->flags & DISPLAY_FLAGS_HSYNC_LOW)
603 		dmode->flags |= DRM_MODE_FLAG_NHSYNC;
604 	if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH)
605 		dmode->flags |= DRM_MODE_FLAG_PVSYNC;
606 	else if (vm->flags & DISPLAY_FLAGS_VSYNC_LOW)
607 		dmode->flags |= DRM_MODE_FLAG_NVSYNC;
608 	if (vm->flags & DISPLAY_FLAGS_INTERLACED)
609 		dmode->flags |= DRM_MODE_FLAG_INTERLACE;
610 	if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN)
611 		dmode->flags |= DRM_MODE_FLAG_DBLSCAN;
612 	if (vm->flags & DISPLAY_FLAGS_DOUBLECLK)
613 		dmode->flags |= DRM_MODE_FLAG_DBLCLK;
614 	drm_mode_set_name(dmode);
615 }
616 EXPORT_SYMBOL_GPL(drm_display_mode_from_videomode);
617 
618 /**
619  * drm_display_mode_to_videomode - fill in @vm using @dmode,
620  * @dmode: drm_display_mode structure to use as source
621  * @vm: videomode structure to use as destination
622  *
623  * Fills out @vm using the display mode specified in @dmode.
624  */
drm_display_mode_to_videomode(const struct drm_display_mode * dmode,struct videomode * vm)625 void drm_display_mode_to_videomode(const struct drm_display_mode *dmode,
626 				   struct videomode *vm)
627 {
628 	vm->hactive = dmode->hdisplay;
629 	vm->hfront_porch = dmode->hsync_start - dmode->hdisplay;
630 	vm->hsync_len = dmode->hsync_end - dmode->hsync_start;
631 	vm->hback_porch = dmode->htotal - dmode->hsync_end;
632 
633 	vm->vactive = dmode->vdisplay;
634 	vm->vfront_porch = dmode->vsync_start - dmode->vdisplay;
635 	vm->vsync_len = dmode->vsync_end - dmode->vsync_start;
636 	vm->vback_porch = dmode->vtotal - dmode->vsync_end;
637 
638 	vm->pixelclock = dmode->clock * 1000;
639 
640 	vm->flags = 0;
641 	if (dmode->flags & DRM_MODE_FLAG_PHSYNC)
642 		vm->flags |= DISPLAY_FLAGS_HSYNC_HIGH;
643 	else if (dmode->flags & DRM_MODE_FLAG_NHSYNC)
644 		vm->flags |= DISPLAY_FLAGS_HSYNC_LOW;
645 	if (dmode->flags & DRM_MODE_FLAG_PVSYNC)
646 		vm->flags |= DISPLAY_FLAGS_VSYNC_HIGH;
647 	else if (dmode->flags & DRM_MODE_FLAG_NVSYNC)
648 		vm->flags |= DISPLAY_FLAGS_VSYNC_LOW;
649 	if (dmode->flags & DRM_MODE_FLAG_INTERLACE)
650 		vm->flags |= DISPLAY_FLAGS_INTERLACED;
651 	if (dmode->flags & DRM_MODE_FLAG_DBLSCAN)
652 		vm->flags |= DISPLAY_FLAGS_DOUBLESCAN;
653 	if (dmode->flags & DRM_MODE_FLAG_DBLCLK)
654 		vm->flags |= DISPLAY_FLAGS_DOUBLECLK;
655 }
656 EXPORT_SYMBOL_GPL(drm_display_mode_to_videomode);
657 
658 /**
659  * drm_bus_flags_from_videomode - extract information about pixelclk and
660  * DE polarity from videomode and store it in a separate variable
661  * @vm: videomode structure to use
662  * @bus_flags: information about pixelclk, sync and DE polarity will be stored
663  * here
664  *
665  * Sets DRM_BUS_FLAG_DE_(LOW|HIGH),  DRM_BUS_FLAG_PIXDATA_(POS|NEG)EDGE and
666  * DISPLAY_FLAGS_SYNC_(POS|NEG)EDGE in @bus_flags according to DISPLAY_FLAGS
667  * found in @vm
668  */
drm_bus_flags_from_videomode(const struct videomode * vm,u32 * bus_flags)669 void drm_bus_flags_from_videomode(const struct videomode *vm, u32 *bus_flags)
670 {
671 	*bus_flags = 0;
672 	if (vm->flags & DISPLAY_FLAGS_PIXDATA_POSEDGE)
673 		*bus_flags |= DRM_BUS_FLAG_PIXDATA_POSEDGE;
674 	if (vm->flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
675 		*bus_flags |= DRM_BUS_FLAG_PIXDATA_NEGEDGE;
676 
677 	if (vm->flags & DISPLAY_FLAGS_SYNC_POSEDGE)
678 		*bus_flags |= DRM_BUS_FLAG_SYNC_POSEDGE;
679 	if (vm->flags & DISPLAY_FLAGS_SYNC_NEGEDGE)
680 		*bus_flags |= DRM_BUS_FLAG_SYNC_NEGEDGE;
681 
682 	if (vm->flags & DISPLAY_FLAGS_DE_LOW)
683 		*bus_flags |= DRM_BUS_FLAG_DE_LOW;
684 	if (vm->flags & DISPLAY_FLAGS_DE_HIGH)
685 		*bus_flags |= DRM_BUS_FLAG_DE_HIGH;
686 }
687 EXPORT_SYMBOL_GPL(drm_bus_flags_from_videomode);
688 
689 #ifdef CONFIG_OF
690 /**
691  * of_get_drm_display_mode - get a drm_display_mode from devicetree
692  * @np: device_node with the timing specification
693  * @dmode: will be set to the return value
694  * @bus_flags: information about pixelclk, sync and DE polarity
695  * @index: index into the list of display timings in devicetree
696  *
697  * This function is expensive and should only be used, if only one mode is to be
698  * read from DT. To get multiple modes start with of_get_display_timings and
699  * work with that instead.
700  *
701  * Returns:
702  * 0 on success, a negative errno code when no of videomode node was found.
703  */
of_get_drm_display_mode(struct device_node * np,struct drm_display_mode * dmode,u32 * bus_flags,int index)704 int of_get_drm_display_mode(struct device_node *np,
705 			    struct drm_display_mode *dmode, u32 *bus_flags,
706 			    int index)
707 {
708 	struct videomode vm;
709 	int ret;
710 
711 	ret = of_get_videomode(np, &vm, index);
712 	if (ret)
713 		return ret;
714 
715 	drm_display_mode_from_videomode(&vm, dmode);
716 	if (bus_flags)
717 		drm_bus_flags_from_videomode(&vm, bus_flags);
718 
719 	pr_debug("%pOF: got %dx%d display mode from %s\n",
720 		np, vm.hactive, vm.vactive, np->name);
721 	drm_mode_debug_printmodeline(dmode);
722 
723 	return 0;
724 }
725 EXPORT_SYMBOL_GPL(of_get_drm_display_mode);
726 #endif /* CONFIG_OF */
727 #endif /* CONFIG_VIDEOMODE_HELPERS */
728 
729 /**
730  * drm_mode_set_name - set the name on a mode
731  * @mode: name will be set in this mode
732  *
733  * Set the name of @mode to a standard format which is <hdisplay>x<vdisplay>
734  * with an optional 'i' suffix for interlaced modes.
735  */
drm_mode_set_name(struct drm_display_mode * mode)736 void drm_mode_set_name(struct drm_display_mode *mode)
737 {
738 	bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
739 
740 	snprintf(mode->name, DRM_DISPLAY_MODE_LEN, "%dx%d%s",
741 		 mode->hdisplay, mode->vdisplay,
742 		 interlaced ? "i" : "");
743 }
744 EXPORT_SYMBOL(drm_mode_set_name);
745 
746 /**
747  * drm_mode_hsync - get the hsync of a mode
748  * @mode: mode
749  *
750  * Returns:
751  * @modes's hsync rate in kHz, rounded to the nearest integer. Calculates the
752  * value first if it is not yet set.
753  */
drm_mode_hsync(const struct drm_display_mode * mode)754 int drm_mode_hsync(const struct drm_display_mode *mode)
755 {
756 	unsigned int calc_val;
757 
758 	if (mode->hsync)
759 		return mode->hsync;
760 
761 	if (mode->htotal < 0)
762 		return 0;
763 
764 	calc_val = (mode->clock * 1000) / mode->htotal; /* hsync in Hz */
765 	calc_val += 500;				/* round to 1000Hz */
766 	calc_val /= 1000;				/* truncate to kHz */
767 
768 	return calc_val;
769 }
770 EXPORT_SYMBOL(drm_mode_hsync);
771 
772 /**
773  * drm_mode_vrefresh - get the vrefresh of a mode
774  * @mode: mode
775  *
776  * Returns:
777  * @modes's vrefresh rate in Hz, rounded to the nearest integer. Calculates the
778  * value first if it is not yet set.
779  */
drm_mode_vrefresh(const struct drm_display_mode * mode)780 int drm_mode_vrefresh(const struct drm_display_mode *mode)
781 {
782 	int refresh = 0;
783 
784 	if (mode->vrefresh > 0)
785 		refresh = mode->vrefresh;
786 	else if (mode->htotal > 0 && mode->vtotal > 0) {
787 		unsigned int num, den;
788 
789 		num = mode->clock * 1000;
790 		den = mode->htotal * mode->vtotal;
791 
792 		if (mode->flags & DRM_MODE_FLAG_INTERLACE)
793 			num *= 2;
794 		if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
795 			den *= 2;
796 		if (mode->vscan > 1)
797 			den *= mode->vscan;
798 
799 		refresh = DIV_ROUND_CLOSEST(num, den);
800 	}
801 	return refresh;
802 }
803 EXPORT_SYMBOL(drm_mode_vrefresh);
804 
805 /**
806  * drm_mode_get_hv_timing - Fetches hdisplay/vdisplay for given mode
807  * @mode: mode to query
808  * @hdisplay: hdisplay value to fill in
809  * @vdisplay: vdisplay value to fill in
810  *
811  * The vdisplay value will be doubled if the specified mode is a stereo mode of
812  * the appropriate layout.
813  */
drm_mode_get_hv_timing(const struct drm_display_mode * mode,int * hdisplay,int * vdisplay)814 void drm_mode_get_hv_timing(const struct drm_display_mode *mode,
815 			    int *hdisplay, int *vdisplay)
816 {
817 	struct drm_display_mode adjusted = *mode;
818 
819 	drm_mode_set_crtcinfo(&adjusted, CRTC_STEREO_DOUBLE_ONLY);
820 	*hdisplay = adjusted.crtc_hdisplay;
821 	*vdisplay = adjusted.crtc_vdisplay;
822 }
823 EXPORT_SYMBOL(drm_mode_get_hv_timing);
824 
825 /**
826  * drm_mode_set_crtcinfo - set CRTC modesetting timing parameters
827  * @p: mode
828  * @adjust_flags: a combination of adjustment flags
829  *
830  * Setup the CRTC modesetting timing parameters for @p, adjusting if necessary.
831  *
832  * - The CRTC_INTERLACE_HALVE_V flag can be used to halve vertical timings of
833  *   interlaced modes.
834  * - The CRTC_STEREO_DOUBLE flag can be used to compute the timings for
835  *   buffers containing two eyes (only adjust the timings when needed, eg. for
836  *   "frame packing" or "side by side full").
837  * - The CRTC_NO_DBLSCAN and CRTC_NO_VSCAN flags request that adjustment *not*
838  *   be performed for doublescan and vscan > 1 modes respectively.
839  */
drm_mode_set_crtcinfo(struct drm_display_mode * p,int adjust_flags)840 void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
841 {
842 	if (!p)
843 		return;
844 
845 	p->crtc_clock = p->clock;
846 	p->crtc_hdisplay = p->hdisplay;
847 	p->crtc_hsync_start = p->hsync_start;
848 	p->crtc_hsync_end = p->hsync_end;
849 	p->crtc_htotal = p->htotal;
850 	p->crtc_hskew = p->hskew;
851 	p->crtc_vdisplay = p->vdisplay;
852 	p->crtc_vsync_start = p->vsync_start;
853 	p->crtc_vsync_end = p->vsync_end;
854 	p->crtc_vtotal = p->vtotal;
855 
856 	if (p->flags & DRM_MODE_FLAG_INTERLACE) {
857 		if (adjust_flags & CRTC_INTERLACE_HALVE_V) {
858 			p->crtc_vdisplay /= 2;
859 			p->crtc_vsync_start /= 2;
860 			p->crtc_vsync_end /= 2;
861 			p->crtc_vtotal /= 2;
862 		}
863 	}
864 
865 	if (!(adjust_flags & CRTC_NO_DBLSCAN)) {
866 		if (p->flags & DRM_MODE_FLAG_DBLSCAN) {
867 			p->crtc_vdisplay *= 2;
868 			p->crtc_vsync_start *= 2;
869 			p->crtc_vsync_end *= 2;
870 			p->crtc_vtotal *= 2;
871 		}
872 	}
873 
874 	if (!(adjust_flags & CRTC_NO_VSCAN)) {
875 		if (p->vscan > 1) {
876 			p->crtc_vdisplay *= p->vscan;
877 			p->crtc_vsync_start *= p->vscan;
878 			p->crtc_vsync_end *= p->vscan;
879 			p->crtc_vtotal *= p->vscan;
880 		}
881 	}
882 
883 	if (adjust_flags & CRTC_STEREO_DOUBLE) {
884 		unsigned int layout = p->flags & DRM_MODE_FLAG_3D_MASK;
885 
886 		switch (layout) {
887 		case DRM_MODE_FLAG_3D_FRAME_PACKING:
888 			p->crtc_clock *= 2;
889 			p->crtc_vdisplay += p->crtc_vtotal;
890 			p->crtc_vsync_start += p->crtc_vtotal;
891 			p->crtc_vsync_end += p->crtc_vtotal;
892 			p->crtc_vtotal += p->crtc_vtotal;
893 			break;
894 		}
895 	}
896 
897 	p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
898 	p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
899 	p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);
900 	p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);
901 }
902 EXPORT_SYMBOL(drm_mode_set_crtcinfo);
903 
904 /**
905  * drm_mode_copy - copy the mode
906  * @dst: mode to overwrite
907  * @src: mode to copy
908  *
909  * Copy an existing mode into another mode, preserving the object id and
910  * list head of the destination mode.
911  */
drm_mode_copy(struct drm_display_mode * dst,const struct drm_display_mode * src)912 void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode *src)
913 {
914 	int id = dst->base.id;
915 	struct list_head head = dst->head;
916 
917 	*dst = *src;
918 	dst->base.id = id;
919 	dst->head = head;
920 }
921 EXPORT_SYMBOL(drm_mode_copy);
922 
923 /**
924  * drm_mode_duplicate - allocate and duplicate an existing mode
925  * @dev: drm_device to allocate the duplicated mode for
926  * @mode: mode to duplicate
927  *
928  * Just allocate a new mode, copy the existing mode into it, and return
929  * a pointer to it.  Used to create new instances of established modes.
930  *
931  * Returns:
932  * Pointer to duplicated mode on success, NULL on error.
933  */
drm_mode_duplicate(struct drm_device * dev,const struct drm_display_mode * mode)934 struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
935 					    const struct drm_display_mode *mode)
936 {
937 	struct drm_display_mode *nmode;
938 
939 	nmode = drm_mode_create(dev);
940 	if (!nmode)
941 		return NULL;
942 
943 	drm_mode_copy(nmode, mode);
944 
945 	return nmode;
946 }
947 EXPORT_SYMBOL(drm_mode_duplicate);
948 
drm_mode_match_timings(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)949 static bool drm_mode_match_timings(const struct drm_display_mode *mode1,
950 				   const struct drm_display_mode *mode2)
951 {
952 	return mode1->hdisplay == mode2->hdisplay &&
953 		mode1->hsync_start == mode2->hsync_start &&
954 		mode1->hsync_end == mode2->hsync_end &&
955 		mode1->htotal == mode2->htotal &&
956 		mode1->hskew == mode2->hskew &&
957 		mode1->vdisplay == mode2->vdisplay &&
958 		mode1->vsync_start == mode2->vsync_start &&
959 		mode1->vsync_end == mode2->vsync_end &&
960 		mode1->vtotal == mode2->vtotal &&
961 		mode1->vscan == mode2->vscan;
962 }
963 
drm_mode_match_clock(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)964 static bool drm_mode_match_clock(const struct drm_display_mode *mode1,
965 				  const struct drm_display_mode *mode2)
966 {
967 	/*
968 	 * do clock check convert to PICOS
969 	 * so fb modes get matched the same
970 	 */
971 	if (mode1->clock && mode2->clock)
972 		return KHZ2PICOS(mode1->clock) == KHZ2PICOS(mode2->clock);
973 	else
974 		return mode1->clock == mode2->clock;
975 }
976 
drm_mode_match_flags(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)977 static bool drm_mode_match_flags(const struct drm_display_mode *mode1,
978 				 const struct drm_display_mode *mode2)
979 {
980 	return (mode1->flags & ~DRM_MODE_FLAG_3D_MASK) ==
981 		(mode2->flags & ~DRM_MODE_FLAG_3D_MASK);
982 }
983 
drm_mode_match_3d_flags(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)984 static bool drm_mode_match_3d_flags(const struct drm_display_mode *mode1,
985 				    const struct drm_display_mode *mode2)
986 {
987 	return (mode1->flags & DRM_MODE_FLAG_3D_MASK) ==
988 		(mode2->flags & DRM_MODE_FLAG_3D_MASK);
989 }
990 
drm_mode_match_aspect_ratio(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)991 static bool drm_mode_match_aspect_ratio(const struct drm_display_mode *mode1,
992 					const struct drm_display_mode *mode2)
993 {
994 	return mode1->picture_aspect_ratio == mode2->picture_aspect_ratio;
995 }
996 
997 /**
998  * drm_mode_match - test modes for (partial) equality
999  * @mode1: first mode
1000  * @mode2: second mode
1001  * @match_flags: which parts need to match (DRM_MODE_MATCH_*)
1002  *
1003  * Check to see if @mode1 and @mode2 are equivalent.
1004  *
1005  * Returns:
1006  * True if the modes are (partially) equal, false otherwise.
1007  */
drm_mode_match(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2,unsigned int match_flags)1008 bool drm_mode_match(const struct drm_display_mode *mode1,
1009 		    const struct drm_display_mode *mode2,
1010 		    unsigned int match_flags)
1011 {
1012 	if (!mode1 && !mode2)
1013 		return true;
1014 
1015 	if (!mode1 || !mode2)
1016 		return false;
1017 
1018 	if (match_flags & DRM_MODE_MATCH_TIMINGS &&
1019 	    !drm_mode_match_timings(mode1, mode2))
1020 		return false;
1021 
1022 	if (match_flags & DRM_MODE_MATCH_CLOCK &&
1023 	    !drm_mode_match_clock(mode1, mode2))
1024 		return false;
1025 
1026 	if (match_flags & DRM_MODE_MATCH_FLAGS &&
1027 	    !drm_mode_match_flags(mode1, mode2))
1028 		return false;
1029 
1030 	if (match_flags & DRM_MODE_MATCH_3D_FLAGS &&
1031 	    !drm_mode_match_3d_flags(mode1, mode2))
1032 		return false;
1033 
1034 	if (match_flags & DRM_MODE_MATCH_ASPECT_RATIO &&
1035 	    !drm_mode_match_aspect_ratio(mode1, mode2))
1036 		return false;
1037 
1038 	return true;
1039 }
1040 EXPORT_SYMBOL(drm_mode_match);
1041 
1042 /**
1043  * drm_mode_equal - test modes for equality
1044  * @mode1: first mode
1045  * @mode2: second mode
1046  *
1047  * Check to see if @mode1 and @mode2 are equivalent.
1048  *
1049  * Returns:
1050  * True if the modes are equal, false otherwise.
1051  */
drm_mode_equal(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1052 bool drm_mode_equal(const struct drm_display_mode *mode1,
1053 		    const struct drm_display_mode *mode2)
1054 {
1055 	return drm_mode_match(mode1, mode2,
1056 			      DRM_MODE_MATCH_TIMINGS |
1057 			      DRM_MODE_MATCH_CLOCK |
1058 			      DRM_MODE_MATCH_FLAGS |
1059 			      DRM_MODE_MATCH_3D_FLAGS|
1060 			      DRM_MODE_MATCH_ASPECT_RATIO);
1061 }
1062 EXPORT_SYMBOL(drm_mode_equal);
1063 
1064 /**
1065  * drm_mode_equal_no_clocks - test modes for equality
1066  * @mode1: first mode
1067  * @mode2: second mode
1068  *
1069  * Check to see if @mode1 and @mode2 are equivalent, but
1070  * don't check the pixel clocks.
1071  *
1072  * Returns:
1073  * True if the modes are equal, false otherwise.
1074  */
drm_mode_equal_no_clocks(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1075 bool drm_mode_equal_no_clocks(const struct drm_display_mode *mode1,
1076 			      const struct drm_display_mode *mode2)
1077 {
1078 	return drm_mode_match(mode1, mode2,
1079 			      DRM_MODE_MATCH_TIMINGS |
1080 			      DRM_MODE_MATCH_FLAGS |
1081 			      DRM_MODE_MATCH_3D_FLAGS);
1082 }
1083 EXPORT_SYMBOL(drm_mode_equal_no_clocks);
1084 
1085 /**
1086  * drm_mode_equal_no_clocks_no_stereo - test modes for equality
1087  * @mode1: first mode
1088  * @mode2: second mode
1089  *
1090  * Check to see if @mode1 and @mode2 are equivalent, but
1091  * don't check the pixel clocks nor the stereo layout.
1092  *
1093  * Returns:
1094  * True if the modes are equal, false otherwise.
1095  */
drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1096 bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1,
1097 					const struct drm_display_mode *mode2)
1098 {
1099 	return drm_mode_match(mode1, mode2,
1100 			      DRM_MODE_MATCH_TIMINGS |
1101 			      DRM_MODE_MATCH_FLAGS);
1102 }
1103 EXPORT_SYMBOL(drm_mode_equal_no_clocks_no_stereo);
1104 
1105 static enum drm_mode_status
drm_mode_validate_basic(const struct drm_display_mode * mode)1106 drm_mode_validate_basic(const struct drm_display_mode *mode)
1107 {
1108 	if (mode->type & ~DRM_MODE_TYPE_ALL)
1109 		return MODE_BAD;
1110 
1111 	if (mode->flags & ~DRM_MODE_FLAG_ALL)
1112 		return MODE_BAD;
1113 
1114 	if ((mode->flags & DRM_MODE_FLAG_3D_MASK) > DRM_MODE_FLAG_3D_MAX)
1115 		return MODE_BAD;
1116 
1117 	if (mode->clock == 0)
1118 		return MODE_CLOCK_LOW;
1119 
1120 	if (mode->hdisplay == 0 ||
1121 	    mode->hsync_start < mode->hdisplay ||
1122 	    mode->hsync_end < mode->hsync_start ||
1123 	    mode->htotal < mode->hsync_end)
1124 		return MODE_H_ILLEGAL;
1125 
1126 	if (mode->vdisplay == 0 ||
1127 	    mode->vsync_start < mode->vdisplay ||
1128 	    mode->vsync_end < mode->vsync_start ||
1129 	    mode->vtotal < mode->vsync_end)
1130 		return MODE_V_ILLEGAL;
1131 
1132 	return MODE_OK;
1133 }
1134 
1135 /**
1136  * drm_mode_validate_driver - make sure the mode is somewhat sane
1137  * @dev: drm device
1138  * @mode: mode to check
1139  *
1140  * First do basic validation on the mode, and then allow the driver
1141  * to check for device/driver specific limitations via the optional
1142  * &drm_mode_config_helper_funcs.mode_valid hook.
1143  *
1144  * Returns:
1145  * The mode status
1146  */
1147 enum drm_mode_status
drm_mode_validate_driver(struct drm_device * dev,const struct drm_display_mode * mode)1148 drm_mode_validate_driver(struct drm_device *dev,
1149 			const struct drm_display_mode *mode)
1150 {
1151 	enum drm_mode_status status;
1152 
1153 	status = drm_mode_validate_basic(mode);
1154 	if (status != MODE_OK)
1155 		return status;
1156 
1157 	if (dev->mode_config.funcs->mode_valid)
1158 		return dev->mode_config.funcs->mode_valid(dev, mode);
1159 	else
1160 		return MODE_OK;
1161 }
1162 EXPORT_SYMBOL(drm_mode_validate_driver);
1163 
1164 /**
1165  * drm_mode_validate_size - make sure modes adhere to size constraints
1166  * @mode: mode to check
1167  * @maxX: maximum width
1168  * @maxY: maximum height
1169  *
1170  * This function is a helper which can be used to validate modes against size
1171  * limitations of the DRM device/connector. If a mode is too big its status
1172  * member is updated with the appropriate validation failure code. The list
1173  * itself is not changed.
1174  *
1175  * Returns:
1176  * The mode status
1177  */
1178 enum drm_mode_status
drm_mode_validate_size(const struct drm_display_mode * mode,int maxX,int maxY)1179 drm_mode_validate_size(const struct drm_display_mode *mode,
1180 		       int maxX, int maxY)
1181 {
1182 	if (maxX > 0 && mode->hdisplay > maxX)
1183 		return MODE_VIRTUAL_X;
1184 
1185 	if (maxY > 0 && mode->vdisplay > maxY)
1186 		return MODE_VIRTUAL_Y;
1187 
1188 	return MODE_OK;
1189 }
1190 EXPORT_SYMBOL(drm_mode_validate_size);
1191 
1192 /**
1193  * drm_mode_validate_ycbcr420 - add 'ycbcr420-only' modes only when allowed
1194  * @mode: mode to check
1195  * @connector: drm connector under action
1196  *
1197  * This function is a helper which can be used to filter out any YCBCR420
1198  * only mode, when the source doesn't support it.
1199  *
1200  * Returns:
1201  * The mode status
1202  */
1203 enum drm_mode_status
drm_mode_validate_ycbcr420(const struct drm_display_mode * mode,struct drm_connector * connector)1204 drm_mode_validate_ycbcr420(const struct drm_display_mode *mode,
1205 			   struct drm_connector *connector)
1206 {
1207 	u8 vic = drm_match_cea_mode(mode);
1208 	enum drm_mode_status status = MODE_OK;
1209 	struct drm_hdmi_info *hdmi = &connector->display_info.hdmi;
1210 
1211 	if (test_bit(vic, hdmi->y420_vdb_modes)) {
1212 		if (!connector->ycbcr_420_allowed)
1213 			status = MODE_NO_420;
1214 	}
1215 
1216 	return status;
1217 }
1218 EXPORT_SYMBOL(drm_mode_validate_ycbcr420);
1219 
1220 #define MODE_STATUS(status) [MODE_ ## status + 3] = #status
1221 
1222 static const char * const drm_mode_status_names[] = {
1223 	MODE_STATUS(OK),
1224 	MODE_STATUS(HSYNC),
1225 	MODE_STATUS(VSYNC),
1226 	MODE_STATUS(H_ILLEGAL),
1227 	MODE_STATUS(V_ILLEGAL),
1228 	MODE_STATUS(BAD_WIDTH),
1229 	MODE_STATUS(NOMODE),
1230 	MODE_STATUS(NO_INTERLACE),
1231 	MODE_STATUS(NO_DBLESCAN),
1232 	MODE_STATUS(NO_VSCAN),
1233 	MODE_STATUS(MEM),
1234 	MODE_STATUS(VIRTUAL_X),
1235 	MODE_STATUS(VIRTUAL_Y),
1236 	MODE_STATUS(MEM_VIRT),
1237 	MODE_STATUS(NOCLOCK),
1238 	MODE_STATUS(CLOCK_HIGH),
1239 	MODE_STATUS(CLOCK_LOW),
1240 	MODE_STATUS(CLOCK_RANGE),
1241 	MODE_STATUS(BAD_HVALUE),
1242 	MODE_STATUS(BAD_VVALUE),
1243 	MODE_STATUS(BAD_VSCAN),
1244 	MODE_STATUS(HSYNC_NARROW),
1245 	MODE_STATUS(HSYNC_WIDE),
1246 	MODE_STATUS(HBLANK_NARROW),
1247 	MODE_STATUS(HBLANK_WIDE),
1248 	MODE_STATUS(VSYNC_NARROW),
1249 	MODE_STATUS(VSYNC_WIDE),
1250 	MODE_STATUS(VBLANK_NARROW),
1251 	MODE_STATUS(VBLANK_WIDE),
1252 	MODE_STATUS(PANEL),
1253 	MODE_STATUS(INTERLACE_WIDTH),
1254 	MODE_STATUS(ONE_WIDTH),
1255 	MODE_STATUS(ONE_HEIGHT),
1256 	MODE_STATUS(ONE_SIZE),
1257 	MODE_STATUS(NO_REDUCED),
1258 	MODE_STATUS(NO_STEREO),
1259 	MODE_STATUS(NO_420),
1260 	MODE_STATUS(STALE),
1261 	MODE_STATUS(BAD),
1262 	MODE_STATUS(ERROR),
1263 };
1264 
1265 #undef MODE_STATUS
1266 
drm_get_mode_status_name(enum drm_mode_status status)1267 const char *drm_get_mode_status_name(enum drm_mode_status status)
1268 {
1269 	int index = status + 3;
1270 
1271 	if (WARN_ON(index < 0 || index >= ARRAY_SIZE(drm_mode_status_names)))
1272 		return "";
1273 
1274 	return drm_mode_status_names[index];
1275 }
1276 
1277 /**
1278  * drm_mode_prune_invalid - remove invalid modes from mode list
1279  * @dev: DRM device
1280  * @mode_list: list of modes to check
1281  * @verbose: be verbose about it
1282  *
1283  * This helper function can be used to prune a display mode list after
1284  * validation has been completed. All modes who's status is not MODE_OK will be
1285  * removed from the list, and if @verbose the status code and mode name is also
1286  * printed to dmesg.
1287  */
drm_mode_prune_invalid(struct drm_device * dev,struct list_head * mode_list,bool verbose)1288 void drm_mode_prune_invalid(struct drm_device *dev,
1289 			    struct list_head *mode_list, bool verbose)
1290 {
1291 	struct drm_display_mode *mode, *t;
1292 
1293 	list_for_each_entry_safe(mode, t, mode_list, head) {
1294 		if (mode->status != MODE_OK) {
1295 			list_del(&mode->head);
1296 			if (verbose) {
1297 				drm_mode_debug_printmodeline(mode);
1298 				DRM_DEBUG_KMS("Not using %s mode: %s\n",
1299 					      mode->name,
1300 					      drm_get_mode_status_name(mode->status));
1301 			}
1302 			drm_mode_destroy(dev, mode);
1303 		}
1304 	}
1305 }
1306 EXPORT_SYMBOL(drm_mode_prune_invalid);
1307 
1308 /**
1309  * drm_mode_compare - compare modes for favorability
1310  * @priv: unused
1311  * @lh_a: list_head for first mode
1312  * @lh_b: list_head for second mode
1313  *
1314  * Compare two modes, given by @lh_a and @lh_b, returning a value indicating
1315  * which is better.
1316  *
1317  * Returns:
1318  * Negative if @lh_a is better than @lh_b, zero if they're equivalent, or
1319  * positive if @lh_b is better than @lh_a.
1320  */
drm_mode_compare(void * priv,struct list_head * lh_a,struct list_head * lh_b)1321 static int drm_mode_compare(void *priv, struct list_head *lh_a, struct list_head *lh_b)
1322 {
1323 	struct drm_display_mode *a = list_entry(lh_a, struct drm_display_mode, head);
1324 	struct drm_display_mode *b = list_entry(lh_b, struct drm_display_mode, head);
1325 	int diff;
1326 
1327 	diff = ((b->type & DRM_MODE_TYPE_PREFERRED) != 0) -
1328 		((a->type & DRM_MODE_TYPE_PREFERRED) != 0);
1329 	if (diff)
1330 		return diff;
1331 	diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay;
1332 	if (diff)
1333 		return diff;
1334 
1335 	diff = b->vrefresh - a->vrefresh;
1336 	if (diff)
1337 		return diff;
1338 
1339 	diff = b->clock - a->clock;
1340 	return diff;
1341 }
1342 
1343 /**
1344  * drm_mode_sort - sort mode list
1345  * @mode_list: list of drm_display_mode structures to sort
1346  *
1347  * Sort @mode_list by favorability, moving good modes to the head of the list.
1348  */
drm_mode_sort(struct list_head * mode_list)1349 void drm_mode_sort(struct list_head *mode_list)
1350 {
1351 	list_sort(NULL, mode_list, drm_mode_compare);
1352 }
1353 EXPORT_SYMBOL(drm_mode_sort);
1354 
1355 /**
1356  * drm_connector_list_update - update the mode list for the connector
1357  * @connector: the connector to update
1358  *
1359  * This moves the modes from the @connector probed_modes list
1360  * to the actual mode list. It compares the probed mode against the current
1361  * list and only adds different/new modes.
1362  *
1363  * This is just a helper functions doesn't validate any modes itself and also
1364  * doesn't prune any invalid modes. Callers need to do that themselves.
1365  */
drm_connector_list_update(struct drm_connector * connector)1366 void drm_connector_list_update(struct drm_connector *connector)
1367 {
1368 	struct drm_display_mode *pmode, *pt;
1369 
1370 	WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
1371 
1372 	list_for_each_entry_safe(pmode, pt, &connector->probed_modes, head) {
1373 		struct drm_display_mode *mode;
1374 		bool found_it = false;
1375 
1376 		/* go through current modes checking for the new probed mode */
1377 		list_for_each_entry(mode, &connector->modes, head) {
1378 			if (!drm_mode_equal(pmode, mode))
1379 				continue;
1380 
1381 			found_it = true;
1382 
1383 			/*
1384 			 * If the old matching mode is stale (ie. left over
1385 			 * from a previous probe) just replace it outright.
1386 			 * Otherwise just merge the type bits between all
1387 			 * equal probed modes.
1388 			 *
1389 			 * If two probed modes are considered equal, pick the
1390 			 * actual timings from the one that's marked as
1391 			 * preferred (in case the match isn't 100%). If
1392 			 * multiple or zero preferred modes are present, favor
1393 			 * the mode added to the probed_modes list first.
1394 			 */
1395 			if (mode->status == MODE_STALE) {
1396 				drm_mode_copy(mode, pmode);
1397 			} else if ((mode->type & DRM_MODE_TYPE_PREFERRED) == 0 &&
1398 				   (pmode->type & DRM_MODE_TYPE_PREFERRED) != 0) {
1399 				pmode->type |= mode->type;
1400 				drm_mode_copy(mode, pmode);
1401 			} else {
1402 				mode->type |= pmode->type;
1403 			}
1404 
1405 			list_del(&pmode->head);
1406 			drm_mode_destroy(connector->dev, pmode);
1407 			break;
1408 		}
1409 
1410 		if (!found_it) {
1411 			list_move_tail(&pmode->head, &connector->modes);
1412 		}
1413 	}
1414 }
1415 EXPORT_SYMBOL(drm_connector_list_update);
1416 
1417 /**
1418  * drm_mode_parse_command_line_for_connector - parse command line modeline for connector
1419  * @mode_option: optional per connector mode option
1420  * @connector: connector to parse modeline for
1421  * @mode: preallocated drm_cmdline_mode structure to fill out
1422  *
1423  * This parses @mode_option command line modeline for modes and options to
1424  * configure the connector. If @mode_option is NULL the default command line
1425  * modeline in fb_mode_option will be parsed instead.
1426  *
1427  * This uses the same parameters as the fb modedb.c, except for an extra
1428  * force-enable, force-enable-digital and force-disable bit at the end::
1429  *
1430  *	<xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
1431  *
1432  * The intermediate drm_cmdline_mode structure is required to store additional
1433  * options from the command line modline like the force-enable/disable flag.
1434  *
1435  * Returns:
1436  * True if a valid modeline has been parsed, false otherwise.
1437  */
drm_mode_parse_command_line_for_connector(const char * mode_option,struct drm_connector * connector,struct drm_cmdline_mode * mode)1438 bool drm_mode_parse_command_line_for_connector(const char *mode_option,
1439 					       struct drm_connector *connector,
1440 					       struct drm_cmdline_mode *mode)
1441 {
1442 	const char *name;
1443 	unsigned int namelen;
1444 	bool res_specified = false, bpp_specified = false, refresh_specified = false;
1445 	unsigned int xres = 0, yres = 0, bpp = 32, refresh = 0;
1446 	bool yres_specified = false, cvt = false, rb = false;
1447 	bool interlace = false, margins = false, was_digit = false;
1448 	int i;
1449 	enum drm_connector_force force = DRM_FORCE_UNSPECIFIED;
1450 
1451 #ifdef CONFIG_FB
1452 	if (!mode_option)
1453 		mode_option = fb_mode_option;
1454 #endif
1455 
1456 	if (!mode_option) {
1457 		mode->specified = false;
1458 		return false;
1459 	}
1460 
1461 	name = mode_option;
1462 	namelen = strlen(name);
1463 	for (i = namelen-1; i >= 0; i--) {
1464 		switch (name[i]) {
1465 		case '@':
1466 			if (!refresh_specified && !bpp_specified &&
1467 			    !yres_specified && !cvt && !rb && was_digit) {
1468 				refresh = simple_strtol(&name[i+1], NULL, 10);
1469 				refresh_specified = true;
1470 				was_digit = false;
1471 			} else
1472 				goto done;
1473 			break;
1474 		case '-':
1475 			if (!bpp_specified && !yres_specified && !cvt &&
1476 			    !rb && was_digit) {
1477 				bpp = simple_strtol(&name[i+1], NULL, 10);
1478 				bpp_specified = true;
1479 				was_digit = false;
1480 			} else
1481 				goto done;
1482 			break;
1483 		case 'x':
1484 			if (!yres_specified && was_digit) {
1485 				yres = simple_strtol(&name[i+1], NULL, 10);
1486 				yres_specified = true;
1487 				was_digit = false;
1488 			} else
1489 				goto done;
1490 			break;
1491 		case '0' ... '9':
1492 			was_digit = true;
1493 			break;
1494 		case 'M':
1495 			if (yres_specified || cvt || was_digit)
1496 				goto done;
1497 			cvt = true;
1498 			break;
1499 		case 'R':
1500 			if (yres_specified || cvt || rb || was_digit)
1501 				goto done;
1502 			rb = true;
1503 			break;
1504 		case 'm':
1505 			if (cvt || yres_specified || was_digit)
1506 				goto done;
1507 			margins = true;
1508 			break;
1509 		case 'i':
1510 			if (cvt || yres_specified || was_digit)
1511 				goto done;
1512 			interlace = true;
1513 			break;
1514 		case 'e':
1515 			if (yres_specified || bpp_specified || refresh_specified ||
1516 			    was_digit || (force != DRM_FORCE_UNSPECIFIED))
1517 				goto done;
1518 
1519 			force = DRM_FORCE_ON;
1520 			break;
1521 		case 'D':
1522 			if (yres_specified || bpp_specified || refresh_specified ||
1523 			    was_digit || (force != DRM_FORCE_UNSPECIFIED))
1524 				goto done;
1525 
1526 			if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
1527 			    (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
1528 				force = DRM_FORCE_ON;
1529 			else
1530 				force = DRM_FORCE_ON_DIGITAL;
1531 			break;
1532 		case 'd':
1533 			if (yres_specified || bpp_specified || refresh_specified ||
1534 			    was_digit || (force != DRM_FORCE_UNSPECIFIED))
1535 				goto done;
1536 
1537 			force = DRM_FORCE_OFF;
1538 			break;
1539 		default:
1540 			goto done;
1541 		}
1542 	}
1543 
1544 	if (i < 0 && yres_specified) {
1545 		char *ch;
1546 		xres = simple_strtol(name, &ch, 10);
1547 		if ((ch != NULL) && (*ch == 'x'))
1548 			res_specified = true;
1549 		else
1550 			i = ch - name;
1551 	} else if (!yres_specified && was_digit) {
1552 		/* catch mode that begins with digits but has no 'x' */
1553 		i = 0;
1554 	}
1555 done:
1556 	if (i >= 0) {
1557 		pr_warn("[drm] parse error at position %i in video mode '%s'\n",
1558 			i, name);
1559 		mode->specified = false;
1560 		return false;
1561 	}
1562 
1563 	if (res_specified) {
1564 		mode->specified = true;
1565 		mode->xres = xres;
1566 		mode->yres = yres;
1567 	}
1568 
1569 	if (refresh_specified) {
1570 		mode->refresh_specified = true;
1571 		mode->refresh = refresh;
1572 	}
1573 
1574 	if (bpp_specified) {
1575 		mode->bpp_specified = true;
1576 		mode->bpp = bpp;
1577 	}
1578 	mode->rb = rb;
1579 	mode->cvt = cvt;
1580 	mode->interlace = interlace;
1581 	mode->margins = margins;
1582 	mode->force = force;
1583 
1584 	return true;
1585 }
1586 EXPORT_SYMBOL(drm_mode_parse_command_line_for_connector);
1587 
1588 /**
1589  * drm_mode_create_from_cmdline_mode - convert a command line modeline into a DRM display mode
1590  * @dev: DRM device to create the new mode for
1591  * @cmd: input command line modeline
1592  *
1593  * Returns:
1594  * Pointer to converted mode on success, NULL on error.
1595  */
1596 struct drm_display_mode *
drm_mode_create_from_cmdline_mode(struct drm_device * dev,struct drm_cmdline_mode * cmd)1597 drm_mode_create_from_cmdline_mode(struct drm_device *dev,
1598 				  struct drm_cmdline_mode *cmd)
1599 {
1600 	struct drm_display_mode *mode;
1601 
1602 	if (cmd->cvt)
1603 		mode = drm_cvt_mode(dev,
1604 				    cmd->xres, cmd->yres,
1605 				    cmd->refresh_specified ? cmd->refresh : 60,
1606 				    cmd->rb, cmd->interlace,
1607 				    cmd->margins);
1608 	else
1609 		mode = drm_gtf_mode(dev,
1610 				    cmd->xres, cmd->yres,
1611 				    cmd->refresh_specified ? cmd->refresh : 60,
1612 				    cmd->interlace,
1613 				    cmd->margins);
1614 	if (!mode)
1615 		return NULL;
1616 
1617 	mode->type |= DRM_MODE_TYPE_USERDEF;
1618 	/* fix up 1368x768: GFT/CVT can't express 1366 width due to alignment */
1619 	if (cmd->xres == 1366)
1620 		drm_mode_fixup_1366x768(mode);
1621 	drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
1622 	return mode;
1623 }
1624 EXPORT_SYMBOL(drm_mode_create_from_cmdline_mode);
1625 
1626 /**
1627  * drm_crtc_convert_to_umode - convert a drm_display_mode into a modeinfo
1628  * @out: drm_mode_modeinfo struct to return to the user
1629  * @in: drm_display_mode to use
1630  *
1631  * Convert a drm_display_mode into a drm_mode_modeinfo structure to return to
1632  * the user.
1633  */
drm_mode_convert_to_umode(struct drm_mode_modeinfo * out,const struct drm_display_mode * in)1634 void drm_mode_convert_to_umode(struct drm_mode_modeinfo *out,
1635 			       const struct drm_display_mode *in)
1636 {
1637 	WARN(in->hdisplay > USHRT_MAX || in->hsync_start > USHRT_MAX ||
1638 	     in->hsync_end > USHRT_MAX || in->htotal > USHRT_MAX ||
1639 	     in->hskew > USHRT_MAX || in->vdisplay > USHRT_MAX ||
1640 	     in->vsync_start > USHRT_MAX || in->vsync_end > USHRT_MAX ||
1641 	     in->vtotal > USHRT_MAX || in->vscan > USHRT_MAX,
1642 	     "timing values too large for mode info\n");
1643 
1644 	out->clock = in->clock;
1645 	out->hdisplay = in->hdisplay;
1646 	out->hsync_start = in->hsync_start;
1647 	out->hsync_end = in->hsync_end;
1648 	out->htotal = in->htotal;
1649 	out->hskew = in->hskew;
1650 	out->vdisplay = in->vdisplay;
1651 	out->vsync_start = in->vsync_start;
1652 	out->vsync_end = in->vsync_end;
1653 	out->vtotal = in->vtotal;
1654 	out->vscan = in->vscan;
1655 	out->vrefresh = in->vrefresh;
1656 	out->flags = in->flags;
1657 	out->type = in->type;
1658 
1659 	switch (in->picture_aspect_ratio) {
1660 	case HDMI_PICTURE_ASPECT_4_3:
1661 		out->flags |= DRM_MODE_FLAG_PIC_AR_4_3;
1662 		break;
1663 	case HDMI_PICTURE_ASPECT_16_9:
1664 		out->flags |= DRM_MODE_FLAG_PIC_AR_16_9;
1665 		break;
1666 	case HDMI_PICTURE_ASPECT_64_27:
1667 		out->flags |= DRM_MODE_FLAG_PIC_AR_64_27;
1668 		break;
1669 	case HDMI_PICTURE_ASPECT_256_135:
1670 		out->flags |= DRM_MODE_FLAG_PIC_AR_256_135;
1671 		break;
1672 	case HDMI_PICTURE_ASPECT_RESERVED:
1673 	default:
1674 		out->flags |= DRM_MODE_FLAG_PIC_AR_NONE;
1675 		break;
1676 	}
1677 
1678 	strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
1679 	out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
1680 }
1681 
1682 /**
1683  * drm_crtc_convert_umode - convert a modeinfo into a drm_display_mode
1684  * @dev: drm device
1685  * @out: drm_display_mode to return to the user
1686  * @in: drm_mode_modeinfo to use
1687  *
1688  * Convert a drm_mode_modeinfo into a drm_display_mode structure to return to
1689  * the caller.
1690  *
1691  * Returns:
1692  * Zero on success, negative errno on failure.
1693  */
drm_mode_convert_umode(struct drm_device * dev,struct drm_display_mode * out,const struct drm_mode_modeinfo * in)1694 int drm_mode_convert_umode(struct drm_device *dev,
1695 			   struct drm_display_mode *out,
1696 			   const struct drm_mode_modeinfo *in)
1697 {
1698 	if (in->clock > INT_MAX || in->vrefresh > INT_MAX)
1699 		return -ERANGE;
1700 
1701 	out->clock = in->clock;
1702 	out->hdisplay = in->hdisplay;
1703 	out->hsync_start = in->hsync_start;
1704 	out->hsync_end = in->hsync_end;
1705 	out->htotal = in->htotal;
1706 	out->hskew = in->hskew;
1707 	out->vdisplay = in->vdisplay;
1708 	out->vsync_start = in->vsync_start;
1709 	out->vsync_end = in->vsync_end;
1710 	out->vtotal = in->vtotal;
1711 	out->vscan = in->vscan;
1712 	out->vrefresh = in->vrefresh;
1713 	out->flags = in->flags;
1714 	/*
1715 	 * Old xf86-video-vmware (possibly others too) used to
1716 	 * leave 'type' unititialized. Just ignore any bits we
1717 	 * don't like. It's a just hint after all, and more
1718 	 * useful for the kernel->userspace direction anyway.
1719 	 */
1720 	out->type = in->type & DRM_MODE_TYPE_ALL;
1721 	strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
1722 	out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
1723 
1724 	/* Clearing picture aspect ratio bits from out flags,
1725 	 * as the aspect-ratio information is not stored in
1726 	 * flags for kernel-mode, but in picture_aspect_ratio.
1727 	 */
1728 	out->flags &= ~DRM_MODE_FLAG_PIC_AR_MASK;
1729 
1730 	switch (in->flags & DRM_MODE_FLAG_PIC_AR_MASK) {
1731 	case DRM_MODE_FLAG_PIC_AR_4_3:
1732 		out->picture_aspect_ratio |= HDMI_PICTURE_ASPECT_4_3;
1733 		break;
1734 	case DRM_MODE_FLAG_PIC_AR_16_9:
1735 		out->picture_aspect_ratio |= HDMI_PICTURE_ASPECT_16_9;
1736 		break;
1737 	case DRM_MODE_FLAG_PIC_AR_64_27:
1738 		out->picture_aspect_ratio |= HDMI_PICTURE_ASPECT_64_27;
1739 		break;
1740 	case DRM_MODE_FLAG_PIC_AR_256_135:
1741 		out->picture_aspect_ratio |= HDMI_PICTURE_ASPECT_256_135;
1742 		break;
1743 	default:
1744 		out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_NONE;
1745 		break;
1746 	}
1747 
1748 	out->status = drm_mode_validate_driver(dev, out);
1749 	if (out->status != MODE_OK)
1750 		return -EINVAL;
1751 
1752 	drm_mode_set_crtcinfo(out, CRTC_INTERLACE_HALVE_V);
1753 
1754 	return 0;
1755 }
1756 
1757 /**
1758  * drm_mode_is_420_only - if a given videomode can be only supported in YCBCR420
1759  * output format
1760  *
1761  * @display: display under action
1762  * @mode: video mode to be tested.
1763  *
1764  * Returns:
1765  * true if the mode can be supported in YCBCR420 format
1766  * false if not.
1767  */
drm_mode_is_420_only(const struct drm_display_info * display,const struct drm_display_mode * mode)1768 bool drm_mode_is_420_only(const struct drm_display_info *display,
1769 			  const struct drm_display_mode *mode)
1770 {
1771 	u8 vic = drm_match_cea_mode(mode);
1772 
1773 	return test_bit(vic, display->hdmi.y420_vdb_modes);
1774 }
1775 EXPORT_SYMBOL(drm_mode_is_420_only);
1776 
1777 /**
1778  * drm_mode_is_420_also - if a given videomode can be supported in YCBCR420
1779  * output format also (along with RGB/YCBCR444/422)
1780  *
1781  * @display: display under action.
1782  * @mode: video mode to be tested.
1783  *
1784  * Returns:
1785  * true if the mode can be support YCBCR420 format
1786  * false if not.
1787  */
drm_mode_is_420_also(const struct drm_display_info * display,const struct drm_display_mode * mode)1788 bool drm_mode_is_420_also(const struct drm_display_info *display,
1789 			  const struct drm_display_mode *mode)
1790 {
1791 	u8 vic = drm_match_cea_mode(mode);
1792 
1793 	return test_bit(vic, display->hdmi.y420_cmdb_modes);
1794 }
1795 EXPORT_SYMBOL(drm_mode_is_420_also);
1796 /**
1797  * drm_mode_is_420 - if a given videomode can be supported in YCBCR420
1798  * output format
1799  *
1800  * @display: display under action.
1801  * @mode: video mode to be tested.
1802  *
1803  * Returns:
1804  * true if the mode can be supported in YCBCR420 format
1805  * false if not.
1806  */
drm_mode_is_420(const struct drm_display_info * display,const struct drm_display_mode * mode)1807 bool drm_mode_is_420(const struct drm_display_info *display,
1808 		     const struct drm_display_mode *mode)
1809 {
1810 	return drm_mode_is_420_only(display, mode) ||
1811 		drm_mode_is_420_also(display, mode);
1812 }
1813 EXPORT_SYMBOL(drm_mode_is_420);
1814