1 // SPDX-License-Identifier: GPL-2.0-only
3 * v4l2-dv-timings - dv-timings helper functions
5 * Copyright 2013 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
8 #include <linux/module.h>
9 #include <linux/types.h>
10 #include <linux/kernel.h>
11 #include <linux/errno.h>
12 #include <linux/rational.h>
13 #include <linux/videodev2.h>
14 #include <linux/v4l2-dv-timings.h>
15 #include <media/v4l2-dv-timings.h>
16 #include <linux/math64.h>
17 #include <linux/hdmi.h>
18 #include <media/cec.h>
20 MODULE_AUTHOR("Hans Verkuil");
21 MODULE_DESCRIPTION("V4L2 DV Timings Helper Functions");
22 MODULE_LICENSE("GPL");
24 const struct v4l2_dv_timings v4l2_dv_timings_presets[] = {
25 V4L2_DV_BT_CEA_640X480P59_94,
26 V4L2_DV_BT_CEA_720X480I59_94,
27 V4L2_DV_BT_CEA_720X480P59_94,
28 V4L2_DV_BT_CEA_720X576I50,
29 V4L2_DV_BT_CEA_720X576P50,
30 V4L2_DV_BT_CEA_1280X720P24,
31 V4L2_DV_BT_CEA_1280X720P25,
32 V4L2_DV_BT_CEA_1280X720P30,
33 V4L2_DV_BT_CEA_1280X720P50,
34 V4L2_DV_BT_CEA_1280X720P60,
35 V4L2_DV_BT_CEA_1920X1080P24,
36 V4L2_DV_BT_CEA_1920X1080P25,
37 V4L2_DV_BT_CEA_1920X1080P30,
38 V4L2_DV_BT_CEA_1920X1080I50,
39 V4L2_DV_BT_CEA_1920X1080P50,
40 V4L2_DV_BT_CEA_1920X1080I60,
41 V4L2_DV_BT_CEA_1920X1080P60,
42 V4L2_DV_BT_DMT_640X350P85,
43 V4L2_DV_BT_DMT_640X400P85,
44 V4L2_DV_BT_DMT_720X400P85,
45 V4L2_DV_BT_DMT_640X480P72,
46 V4L2_DV_BT_DMT_640X480P75,
47 V4L2_DV_BT_DMT_640X480P85,
48 V4L2_DV_BT_DMT_800X600P56,
49 V4L2_DV_BT_DMT_800X600P60,
50 V4L2_DV_BT_DMT_800X600P72,
51 V4L2_DV_BT_DMT_800X600P75,
52 V4L2_DV_BT_DMT_800X600P85,
53 V4L2_DV_BT_DMT_800X600P120_RB,
54 V4L2_DV_BT_DMT_848X480P60,
55 V4L2_DV_BT_DMT_1024X768I43,
56 V4L2_DV_BT_DMT_1024X768P60,
57 V4L2_DV_BT_DMT_1024X768P70,
58 V4L2_DV_BT_DMT_1024X768P75,
59 V4L2_DV_BT_DMT_1024X768P85,
60 V4L2_DV_BT_DMT_1024X768P120_RB,
61 V4L2_DV_BT_DMT_1152X864P75,
62 V4L2_DV_BT_DMT_1280X768P60_RB,
63 V4L2_DV_BT_DMT_1280X768P60,
64 V4L2_DV_BT_DMT_1280X768P75,
65 V4L2_DV_BT_DMT_1280X768P85,
66 V4L2_DV_BT_DMT_1280X768P120_RB,
67 V4L2_DV_BT_DMT_1280X800P60_RB,
68 V4L2_DV_BT_DMT_1280X800P60,
69 V4L2_DV_BT_DMT_1280X800P75,
70 V4L2_DV_BT_DMT_1280X800P85,
71 V4L2_DV_BT_DMT_1280X800P120_RB,
72 V4L2_DV_BT_DMT_1280X960P60,
73 V4L2_DV_BT_DMT_1280X960P85,
74 V4L2_DV_BT_DMT_1280X960P120_RB,
75 V4L2_DV_BT_DMT_1280X1024P60,
76 V4L2_DV_BT_DMT_1280X1024P75,
77 V4L2_DV_BT_DMT_1280X1024P85,
78 V4L2_DV_BT_DMT_1280X1024P120_RB,
79 V4L2_DV_BT_DMT_1360X768P60,
80 V4L2_DV_BT_DMT_1360X768P120_RB,
81 V4L2_DV_BT_DMT_1366X768P60,
82 V4L2_DV_BT_DMT_1366X768P60_RB,
83 V4L2_DV_BT_DMT_1400X1050P60_RB,
84 V4L2_DV_BT_DMT_1400X1050P60,
85 V4L2_DV_BT_DMT_1400X1050P75,
86 V4L2_DV_BT_DMT_1400X1050P85,
87 V4L2_DV_BT_DMT_1400X1050P120_RB,
88 V4L2_DV_BT_DMT_1440X900P60_RB,
89 V4L2_DV_BT_DMT_1440X900P60,
90 V4L2_DV_BT_DMT_1440X900P75,
91 V4L2_DV_BT_DMT_1440X900P85,
92 V4L2_DV_BT_DMT_1440X900P120_RB,
93 V4L2_DV_BT_DMT_1600X900P60_RB,
94 V4L2_DV_BT_DMT_1600X1200P60,
95 V4L2_DV_BT_DMT_1600X1200P65,
96 V4L2_DV_BT_DMT_1600X1200P70,
97 V4L2_DV_BT_DMT_1600X1200P75,
98 V4L2_DV_BT_DMT_1600X1200P85,
99 V4L2_DV_BT_DMT_1600X1200P120_RB,
100 V4L2_DV_BT_DMT_1680X1050P60_RB,
101 V4L2_DV_BT_DMT_1680X1050P60,
102 V4L2_DV_BT_DMT_1680X1050P75,
103 V4L2_DV_BT_DMT_1680X1050P85,
104 V4L2_DV_BT_DMT_1680X1050P120_RB,
105 V4L2_DV_BT_DMT_1792X1344P60,
106 V4L2_DV_BT_DMT_1792X1344P75,
107 V4L2_DV_BT_DMT_1792X1344P120_RB,
108 V4L2_DV_BT_DMT_1856X1392P60,
109 V4L2_DV_BT_DMT_1856X1392P75,
110 V4L2_DV_BT_DMT_1856X1392P120_RB,
111 V4L2_DV_BT_DMT_1920X1200P60_RB,
112 V4L2_DV_BT_DMT_1920X1200P60,
113 V4L2_DV_BT_DMT_1920X1200P75,
114 V4L2_DV_BT_DMT_1920X1200P85,
115 V4L2_DV_BT_DMT_1920X1200P120_RB,
116 V4L2_DV_BT_DMT_1920X1440P60,
117 V4L2_DV_BT_DMT_1920X1440P75,
118 V4L2_DV_BT_DMT_1920X1440P120_RB,
119 V4L2_DV_BT_DMT_2048X1152P60_RB,
120 V4L2_DV_BT_DMT_2560X1600P60_RB,
121 V4L2_DV_BT_DMT_2560X1600P60,
122 V4L2_DV_BT_DMT_2560X1600P75,
123 V4L2_DV_BT_DMT_2560X1600P85,
124 V4L2_DV_BT_DMT_2560X1600P120_RB,
125 V4L2_DV_BT_CEA_3840X2160P24,
126 V4L2_DV_BT_CEA_3840X2160P25,
127 V4L2_DV_BT_CEA_3840X2160P30,
128 V4L2_DV_BT_CEA_3840X2160P50,
129 V4L2_DV_BT_CEA_3840X2160P60,
130 V4L2_DV_BT_CEA_4096X2160P24,
131 V4L2_DV_BT_CEA_4096X2160P25,
132 V4L2_DV_BT_CEA_4096X2160P30,
133 V4L2_DV_BT_CEA_4096X2160P50,
134 V4L2_DV_BT_DMT_4096X2160P59_94_RB,
135 V4L2_DV_BT_CEA_4096X2160P60,
138 EXPORT_SYMBOL_GPL(v4l2_dv_timings_presets);
140 bool v4l2_valid_dv_timings(const struct v4l2_dv_timings *t,
141 const struct v4l2_dv_timings_cap *dvcap,
142 v4l2_check_dv_timings_fnc fnc,
145 const struct v4l2_bt_timings *bt = &t->bt;
146 const struct v4l2_bt_timings_cap *cap = &dvcap->bt;
147 u32 caps = cap->capabilities;
149 if (t->type != V4L2_DV_BT_656_1120)
151 if (t->type != dvcap->type ||
152 bt->height < cap->min_height ||
153 bt->height > cap->max_height ||
154 bt->width < cap->min_width ||
155 bt->width > cap->max_width ||
156 bt->pixelclock < cap->min_pixelclock ||
157 bt->pixelclock > cap->max_pixelclock ||
158 (!(caps & V4L2_DV_BT_CAP_CUSTOM) &&
159 cap->standards && bt->standards &&
160 !(bt->standards & cap->standards)) ||
161 (bt->interlaced && !(caps & V4L2_DV_BT_CAP_INTERLACED)) ||
162 (!bt->interlaced && !(caps & V4L2_DV_BT_CAP_PROGRESSIVE)))
165 /* sanity checks for the blanking timings */
166 if (!bt->interlaced &&
167 (bt->il_vbackporch || bt->il_vsync || bt->il_vfrontporch))
169 if (bt->hfrontporch > 2 * bt->width ||
170 bt->hsync > 1024 || bt->hbackporch > 1024)
172 if (bt->vfrontporch > 4096 ||
173 bt->vsync > 128 || bt->vbackporch > 4096)
175 if (bt->interlaced && (bt->il_vfrontporch > 4096 ||
176 bt->il_vsync > 128 || bt->il_vbackporch > 4096))
178 return fnc == NULL || fnc(t, fnc_handle);
180 EXPORT_SYMBOL_GPL(v4l2_valid_dv_timings);
182 int v4l2_enum_dv_timings_cap(struct v4l2_enum_dv_timings *t,
183 const struct v4l2_dv_timings_cap *cap,
184 v4l2_check_dv_timings_fnc fnc,
189 memset(t->reserved, 0, sizeof(t->reserved));
190 for (i = idx = 0; v4l2_dv_timings_presets[i].bt.width; i++) {
191 if (v4l2_valid_dv_timings(v4l2_dv_timings_presets + i, cap,
194 t->timings = v4l2_dv_timings_presets[i];
200 EXPORT_SYMBOL_GPL(v4l2_enum_dv_timings_cap);
202 bool v4l2_find_dv_timings_cap(struct v4l2_dv_timings *t,
203 const struct v4l2_dv_timings_cap *cap,
204 unsigned pclock_delta,
205 v4l2_check_dv_timings_fnc fnc,
210 if (!v4l2_valid_dv_timings(t, cap, fnc, fnc_handle))
213 for (i = 0; v4l2_dv_timings_presets[i].bt.width; i++) {
214 if (v4l2_valid_dv_timings(v4l2_dv_timings_presets + i, cap,
216 v4l2_match_dv_timings(t, v4l2_dv_timings_presets + i,
217 pclock_delta, false)) {
218 u32 flags = t->bt.flags & V4L2_DV_FL_REDUCED_FPS;
220 *t = v4l2_dv_timings_presets[i];
221 if (can_reduce_fps(&t->bt))
222 t->bt.flags |= flags;
229 EXPORT_SYMBOL_GPL(v4l2_find_dv_timings_cap);
231 bool v4l2_find_dv_timings_cea861_vic(struct v4l2_dv_timings *t, u8 vic)
235 for (i = 0; v4l2_dv_timings_presets[i].bt.width; i++) {
236 const struct v4l2_bt_timings *bt =
237 &v4l2_dv_timings_presets[i].bt;
239 if ((bt->flags & V4L2_DV_FL_HAS_CEA861_VIC) &&
240 bt->cea861_vic == vic) {
241 *t = v4l2_dv_timings_presets[i];
247 EXPORT_SYMBOL_GPL(v4l2_find_dv_timings_cea861_vic);
250 * v4l2_match_dv_timings - check if two timings match
251 * @t1: compare this v4l2_dv_timings struct...
252 * @t2: with this struct.
253 * @pclock_delta: the allowed pixelclock deviation.
254 * @match_reduced_fps: if true, then fail if V4L2_DV_FL_REDUCED_FPS does not
257 * Compare t1 with t2 with a given margin of error for the pixelclock.
259 bool v4l2_match_dv_timings(const struct v4l2_dv_timings *t1,
260 const struct v4l2_dv_timings *t2,
261 unsigned pclock_delta, bool match_reduced_fps)
263 if (t1->type != t2->type || t1->type != V4L2_DV_BT_656_1120)
265 if (t1->bt.width == t2->bt.width &&
266 t1->bt.height == t2->bt.height &&
267 t1->bt.interlaced == t2->bt.interlaced &&
268 t1->bt.polarities == t2->bt.polarities &&
269 t1->bt.pixelclock >= t2->bt.pixelclock - pclock_delta &&
270 t1->bt.pixelclock <= t2->bt.pixelclock + pclock_delta &&
271 t1->bt.hfrontporch == t2->bt.hfrontporch &&
272 t1->bt.hsync == t2->bt.hsync &&
273 t1->bt.hbackporch == t2->bt.hbackporch &&
274 t1->bt.vfrontporch == t2->bt.vfrontporch &&
275 t1->bt.vsync == t2->bt.vsync &&
276 t1->bt.vbackporch == t2->bt.vbackporch &&
277 (!match_reduced_fps ||
278 (t1->bt.flags & V4L2_DV_FL_REDUCED_FPS) ==
279 (t2->bt.flags & V4L2_DV_FL_REDUCED_FPS)) &&
280 (!t1->bt.interlaced ||
281 (t1->bt.il_vfrontporch == t2->bt.il_vfrontporch &&
282 t1->bt.il_vsync == t2->bt.il_vsync &&
283 t1->bt.il_vbackporch == t2->bt.il_vbackporch)))
287 EXPORT_SYMBOL_GPL(v4l2_match_dv_timings);
289 void v4l2_print_dv_timings(const char *dev_prefix, const char *prefix,
290 const struct v4l2_dv_timings *t, bool detailed)
292 const struct v4l2_bt_timings *bt = &t->bt;
296 if (t->type != V4L2_DV_BT_656_1120)
299 htot = V4L2_DV_BT_FRAME_WIDTH(bt);
300 vtot = V4L2_DV_BT_FRAME_HEIGHT(bt);
304 fps = (htot * vtot) > 0 ? div_u64((100 * (u64)bt->pixelclock),
310 pr_info("%s: %s%ux%u%s%u.%02u (%ux%u)\n", dev_prefix, prefix,
311 bt->width, bt->height, bt->interlaced ? "i" : "p",
312 fps / 100, fps % 100, htot, vtot);
317 pr_info("%s: horizontal: fp = %u, %ssync = %u, bp = %u\n",
318 dev_prefix, bt->hfrontporch,
319 (bt->polarities & V4L2_DV_HSYNC_POS_POL) ? "+" : "-",
320 bt->hsync, bt->hbackporch);
321 pr_info("%s: vertical: fp = %u, %ssync = %u, bp = %u\n",
322 dev_prefix, bt->vfrontporch,
323 (bt->polarities & V4L2_DV_VSYNC_POS_POL) ? "+" : "-",
324 bt->vsync, bt->vbackporch);
326 pr_info("%s: vertical bottom field: fp = %u, %ssync = %u, bp = %u\n",
327 dev_prefix, bt->il_vfrontporch,
328 (bt->polarities & V4L2_DV_VSYNC_POS_POL) ? "+" : "-",
329 bt->il_vsync, bt->il_vbackporch);
330 pr_info("%s: pixelclock: %llu\n", dev_prefix, bt->pixelclock);
331 pr_info("%s: flags (0x%x):%s%s%s%s%s%s%s%s%s%s\n",
332 dev_prefix, bt->flags,
333 (bt->flags & V4L2_DV_FL_REDUCED_BLANKING) ?
334 " REDUCED_BLANKING" : "",
335 ((bt->flags & V4L2_DV_FL_REDUCED_BLANKING) &&
336 bt->vsync == 8) ? " (V2)" : "",
337 (bt->flags & V4L2_DV_FL_CAN_REDUCE_FPS) ?
338 " CAN_REDUCE_FPS" : "",
339 (bt->flags & V4L2_DV_FL_REDUCED_FPS) ?
341 (bt->flags & V4L2_DV_FL_HALF_LINE) ?
343 (bt->flags & V4L2_DV_FL_IS_CE_VIDEO) ?
345 (bt->flags & V4L2_DV_FL_FIRST_FIELD_EXTRA_LINE) ?
346 " FIRST_FIELD_EXTRA_LINE" : "",
347 (bt->flags & V4L2_DV_FL_HAS_PICTURE_ASPECT) ?
348 " HAS_PICTURE_ASPECT" : "",
349 (bt->flags & V4L2_DV_FL_HAS_CEA861_VIC) ?
350 " HAS_CEA861_VIC" : "",
351 (bt->flags & V4L2_DV_FL_HAS_HDMI_VIC) ?
352 " HAS_HDMI_VIC" : "");
353 pr_info("%s: standards (0x%x):%s%s%s%s%s\n", dev_prefix, bt->standards,
354 (bt->standards & V4L2_DV_BT_STD_CEA861) ? " CEA" : "",
355 (bt->standards & V4L2_DV_BT_STD_DMT) ? " DMT" : "",
356 (bt->standards & V4L2_DV_BT_STD_CVT) ? " CVT" : "",
357 (bt->standards & V4L2_DV_BT_STD_GTF) ? " GTF" : "",
358 (bt->standards & V4L2_DV_BT_STD_SDI) ? " SDI" : "");
359 if (bt->flags & V4L2_DV_FL_HAS_PICTURE_ASPECT)
360 pr_info("%s: picture aspect (hor:vert): %u:%u\n", dev_prefix,
361 bt->picture_aspect.numerator,
362 bt->picture_aspect.denominator);
363 if (bt->flags & V4L2_DV_FL_HAS_CEA861_VIC)
364 pr_info("%s: CEA-861 VIC: %u\n", dev_prefix, bt->cea861_vic);
365 if (bt->flags & V4L2_DV_FL_HAS_HDMI_VIC)
366 pr_info("%s: HDMI VIC: %u\n", dev_prefix, bt->hdmi_vic);
368 EXPORT_SYMBOL_GPL(v4l2_print_dv_timings);
370 struct v4l2_fract v4l2_dv_timings_aspect_ratio(const struct v4l2_dv_timings *t)
372 struct v4l2_fract ratio = { 1, 1 };
375 if (t->type != V4L2_DV_BT_656_1120)
377 if (!(t->bt.flags & V4L2_DV_FL_HAS_PICTURE_ASPECT))
380 ratio.numerator = t->bt.width * t->bt.picture_aspect.denominator;
381 ratio.denominator = t->bt.height * t->bt.picture_aspect.numerator;
383 rational_best_approximation(ratio.numerator, ratio.denominator,
384 ratio.numerator, ratio.denominator, &n, &d);
386 ratio.denominator = d;
389 EXPORT_SYMBOL_GPL(v4l2_dv_timings_aspect_ratio);
391 /** v4l2_calc_timeperframe - helper function to calculate timeperframe based
392 * v4l2_dv_timings fields.
393 * @t - Timings for the video mode.
395 * Calculates the expected timeperframe using the pixel clock value and
396 * horizontal/vertical measures. This means that v4l2_dv_timings structure
397 * must be correctly and fully filled.
399 struct v4l2_fract v4l2_calc_timeperframe(const struct v4l2_dv_timings *t)
401 const struct v4l2_bt_timings *bt = &t->bt;
402 struct v4l2_fract fps_fract = { 1, 1 };
407 if (t->type != V4L2_DV_BT_656_1120)
410 htot = V4L2_DV_BT_FRAME_WIDTH(bt);
411 vtot = V4L2_DV_BT_FRAME_HEIGHT(bt);
412 pclk = bt->pixelclock;
414 if ((bt->flags & V4L2_DV_FL_CAN_DETECT_REDUCED_FPS) &&
415 (bt->flags & V4L2_DV_FL_REDUCED_FPS))
416 pclk = div_u64(pclk * 1000ULL, 1001);
418 fps = (htot * vtot) > 0 ? div_u64((100 * pclk), (htot * vtot)) : 0;
422 rational_best_approximation(fps, 100, fps, 100, &n, &d);
424 fps_fract.numerator = d;
425 fps_fract.denominator = n;
428 EXPORT_SYMBOL_GPL(v4l2_calc_timeperframe);
432 * Based on Coordinated Video Timings Standard
433 * version 1.1 September 10, 2003
436 #define CVT_PXL_CLK_GRAN 250000 /* pixel clock granularity */
437 #define CVT_PXL_CLK_GRAN_RB_V2 1000 /* granularity for reduced blanking v2*/
439 /* Normal blanking */
440 #define CVT_MIN_V_BPORCH 7 /* lines */
441 #define CVT_MIN_V_PORCH_RND 3 /* lines */
442 #define CVT_MIN_VSYNC_BP 550 /* min time of vsync + back porch (us) */
443 #define CVT_HSYNC_PERCENT 8 /* nominal hsync as percentage of line */
445 /* Normal blanking for CVT uses GTF to calculate horizontal blanking */
446 #define CVT_CELL_GRAN 8 /* character cell granularity */
447 #define CVT_M 600 /* blanking formula gradient */
448 #define CVT_C 40 /* blanking formula offset */
449 #define CVT_K 128 /* blanking formula scaling factor */
450 #define CVT_J 20 /* blanking formula scaling factor */
451 #define CVT_C_PRIME (((CVT_C - CVT_J) * CVT_K / 256) + CVT_J)
452 #define CVT_M_PRIME (CVT_K * CVT_M / 256)
454 /* Reduced Blanking */
455 #define CVT_RB_MIN_V_BPORCH 7 /* lines */
456 #define CVT_RB_V_FPORCH 3 /* lines */
457 #define CVT_RB_MIN_V_BLANK 460 /* us */
458 #define CVT_RB_H_SYNC 32 /* pixels */
459 #define CVT_RB_H_BLANK 160 /* pixels */
460 /* Reduce blanking Version 2 */
461 #define CVT_RB_V2_H_BLANK 80 /* pixels */
462 #define CVT_RB_MIN_V_FPORCH 3 /* lines */
463 #define CVT_RB_V2_MIN_V_FPORCH 1 /* lines */
464 #define CVT_RB_V_BPORCH 6 /* lines */
466 /** v4l2_detect_cvt - detect if the given timings follow the CVT standard
467 * @frame_height - the total height of the frame (including blanking) in lines.
468 * @hfreq - the horizontal frequency in Hz.
469 * @vsync - the height of the vertical sync in lines.
470 * @active_width - active width of image (does not include blanking). This
471 * information is needed only in case of version 2 of reduced blanking.
472 * In other cases, this parameter does not have any effect on timings.
473 * @polarities - the horizontal and vertical polarities (same as struct
474 * v4l2_bt_timings polarities).
475 * @interlaced - if this flag is true, it indicates interlaced format
476 * @fmt - the resulting timings.
478 * This function will attempt to detect if the given values correspond to a
479 * valid CVT format. If so, then it will return true, and fmt will be filled
480 * in with the found CVT timings.
482 bool v4l2_detect_cvt(unsigned frame_height,
485 unsigned active_width,
488 struct v4l2_dv_timings *fmt)
490 int v_fp, v_bp, h_fp, h_bp, hsync;
491 int frame_width, image_height, image_width;
492 bool reduced_blanking;
496 if (vsync < 4 || vsync > 8)
499 if (polarities == V4L2_DV_VSYNC_POS_POL)
500 reduced_blanking = false;
501 else if (polarities == V4L2_DV_HSYNC_POS_POL)
502 reduced_blanking = true;
506 if (reduced_blanking && vsync == 8)
509 if (rb_v2 && active_width == 0)
512 if (!rb_v2 && vsync > 7)
519 if (reduced_blanking) {
521 v_bp = CVT_RB_V_BPORCH;
522 v_fp = (CVT_RB_MIN_V_BLANK * hfreq) / 1000000 + 1;
523 v_fp -= vsync + v_bp;
525 if (v_fp < CVT_RB_V2_MIN_V_FPORCH)
526 v_fp = CVT_RB_V2_MIN_V_FPORCH;
528 v_fp = CVT_RB_V_FPORCH;
529 v_bp = (CVT_RB_MIN_V_BLANK * hfreq) / 1000000 + 1;
530 v_bp -= vsync + v_fp;
532 if (v_bp < CVT_RB_MIN_V_BPORCH)
533 v_bp = CVT_RB_MIN_V_BPORCH;
536 v_fp = CVT_MIN_V_PORCH_RND;
537 v_bp = (CVT_MIN_VSYNC_BP * hfreq) / 1000000 + 1 - vsync;
539 if (v_bp < CVT_MIN_V_BPORCH)
540 v_bp = CVT_MIN_V_BPORCH;
544 image_height = (frame_height - 2 * v_fp - 2 * vsync - 2 * v_bp) & ~0x1;
546 image_height = (frame_height - v_fp - vsync - v_bp + 1) & ~0x1;
548 if (image_height < 0)
551 /* Aspect ratio based on vsync */
554 image_width = (image_height * 4) / 3;
557 image_width = (image_height * 16) / 9;
560 image_width = (image_height * 16) / 10;
564 if (image_height == 1024)
565 image_width = (image_height * 5) / 4;
566 else if (image_height == 768)
567 image_width = (image_height * 15) / 9;
572 image_width = active_width;
579 image_width = image_width & ~7;
582 if (reduced_blanking) {
586 h_blank = rb_v2 ? CVT_RB_V2_H_BLANK : CVT_RB_H_BLANK;
587 clk_gran = rb_v2 ? CVT_PXL_CLK_GRAN_RB_V2 : CVT_PXL_CLK_GRAN;
589 pix_clk = (image_width + h_blank) * hfreq;
590 pix_clk = (pix_clk / clk_gran) * clk_gran;
593 hsync = CVT_RB_H_SYNC;
594 h_fp = h_blank - h_bp - hsync;
596 frame_width = image_width + h_blank;
598 unsigned ideal_duty_cycle_per_myriad =
599 100 * CVT_C_PRIME - (CVT_M_PRIME * 100000) / hfreq;
602 if (ideal_duty_cycle_per_myriad < 2000)
603 ideal_duty_cycle_per_myriad = 2000;
605 h_blank = image_width * ideal_duty_cycle_per_myriad /
606 (10000 - ideal_duty_cycle_per_myriad);
607 h_blank = (h_blank / (2 * CVT_CELL_GRAN)) * 2 * CVT_CELL_GRAN;
609 pix_clk = (image_width + h_blank) * hfreq;
610 pix_clk = (pix_clk / CVT_PXL_CLK_GRAN) * CVT_PXL_CLK_GRAN;
613 frame_width = image_width + h_blank;
615 hsync = frame_width * CVT_HSYNC_PERCENT / 100;
616 hsync = (hsync / CVT_CELL_GRAN) * CVT_CELL_GRAN;
617 h_fp = h_blank - hsync - h_bp;
620 fmt->type = V4L2_DV_BT_656_1120;
621 fmt->bt.polarities = polarities;
622 fmt->bt.width = image_width;
623 fmt->bt.height = image_height;
624 fmt->bt.hfrontporch = h_fp;
625 fmt->bt.vfrontporch = v_fp;
626 fmt->bt.hsync = hsync;
627 fmt->bt.vsync = vsync;
628 fmt->bt.hbackporch = frame_width - image_width - h_fp - hsync;
631 fmt->bt.vbackporch = frame_height - image_height - v_fp - vsync;
632 fmt->bt.interlaced = V4L2_DV_PROGRESSIVE;
634 fmt->bt.vbackporch = (frame_height - image_height - 2 * v_fp -
636 fmt->bt.il_vbackporch = frame_height - image_height - 2 * v_fp -
637 2 * vsync - fmt->bt.vbackporch;
638 fmt->bt.il_vfrontporch = v_fp;
639 fmt->bt.il_vsync = vsync;
640 fmt->bt.flags |= V4L2_DV_FL_HALF_LINE;
641 fmt->bt.interlaced = V4L2_DV_INTERLACED;
644 fmt->bt.pixelclock = pix_clk;
645 fmt->bt.standards = V4L2_DV_BT_STD_CVT;
647 if (reduced_blanking)
648 fmt->bt.flags |= V4L2_DV_FL_REDUCED_BLANKING;
652 EXPORT_SYMBOL_GPL(v4l2_detect_cvt);
656 * Based on Generalized Timing Formula Standard
657 * Version 1.1 September 2, 1999
660 #define GTF_PXL_CLK_GRAN 250000 /* pixel clock granularity */
662 #define GTF_MIN_VSYNC_BP 550 /* min time of vsync + back porch (us) */
663 #define GTF_V_FP 1 /* vertical front porch (lines) */
664 #define GTF_CELL_GRAN 8 /* character cell granularity */
667 #define GTF_D_M 600 /* blanking formula gradient */
668 #define GTF_D_C 40 /* blanking formula offset */
669 #define GTF_D_K 128 /* blanking formula scaling factor */
670 #define GTF_D_J 20 /* blanking formula scaling factor */
671 #define GTF_D_C_PRIME ((((GTF_D_C - GTF_D_J) * GTF_D_K) / 256) + GTF_D_J)
672 #define GTF_D_M_PRIME ((GTF_D_K * GTF_D_M) / 256)
675 #define GTF_S_M 3600 /* blanking formula gradient */
676 #define GTF_S_C 40 /* blanking formula offset */
677 #define GTF_S_K 128 /* blanking formula scaling factor */
678 #define GTF_S_J 35 /* blanking formula scaling factor */
679 #define GTF_S_C_PRIME ((((GTF_S_C - GTF_S_J) * GTF_S_K) / 256) + GTF_S_J)
680 #define GTF_S_M_PRIME ((GTF_S_K * GTF_S_M) / 256)
682 /** v4l2_detect_gtf - detect if the given timings follow the GTF standard
683 * @frame_height - the total height of the frame (including blanking) in lines.
684 * @hfreq - the horizontal frequency in Hz.
685 * @vsync - the height of the vertical sync in lines.
686 * @polarities - the horizontal and vertical polarities (same as struct
687 * v4l2_bt_timings polarities).
688 * @interlaced - if this flag is true, it indicates interlaced format
689 * @aspect - preferred aspect ratio. GTF has no method of determining the
690 * aspect ratio in order to derive the image width from the
691 * image height, so it has to be passed explicitly. Usually
692 * the native screen aspect ratio is used for this. If it
693 * is not filled in correctly, then 16:9 will be assumed.
694 * @fmt - the resulting timings.
696 * This function will attempt to detect if the given values correspond to a
697 * valid GTF format. If so, then it will return true, and fmt will be filled
698 * in with the found GTF timings.
700 bool v4l2_detect_gtf(unsigned frame_height,
705 struct v4l2_fract aspect,
706 struct v4l2_dv_timings *fmt)
709 int v_fp, v_bp, h_fp, hsync;
710 int frame_width, image_height, image_width;
717 if (polarities == V4L2_DV_VSYNC_POS_POL)
719 else if (polarities == V4L2_DV_HSYNC_POS_POL)
729 v_bp = (GTF_MIN_VSYNC_BP * hfreq + 500000) / 1000000 - vsync;
731 image_height = (frame_height - 2 * v_fp - 2 * vsync - 2 * v_bp) & ~0x1;
733 image_height = (frame_height - v_fp - vsync - v_bp + 1) & ~0x1;
735 if (image_height < 0)
738 if (aspect.numerator == 0 || aspect.denominator == 0) {
739 aspect.numerator = 16;
740 aspect.denominator = 9;
742 image_width = ((image_height * aspect.numerator) / aspect.denominator);
743 image_width = (image_width + GTF_CELL_GRAN/2) & ~(GTF_CELL_GRAN - 1);
750 num = ((image_width * GTF_D_C_PRIME * (u64)hfreq) -
751 ((u64)image_width * GTF_D_M_PRIME * 1000));
752 den = (hfreq * (100 - GTF_D_C_PRIME) + GTF_D_M_PRIME * 1000) *
754 h_blank = div_u64((num + (den >> 1)), den);
755 h_blank *= (2 * GTF_CELL_GRAN);
760 num = ((image_width * GTF_S_C_PRIME * (u64)hfreq) -
761 ((u64)image_width * GTF_S_M_PRIME * 1000));
762 den = (hfreq * (100 - GTF_S_C_PRIME) + GTF_S_M_PRIME * 1000) *
764 h_blank = div_u64((num + (den >> 1)), den);
765 h_blank *= (2 * GTF_CELL_GRAN);
768 frame_width = image_width + h_blank;
770 pix_clk = (image_width + h_blank) * hfreq;
771 pix_clk = pix_clk / GTF_PXL_CLK_GRAN * GTF_PXL_CLK_GRAN;
773 hsync = (frame_width * 8 + 50) / 100;
774 hsync = DIV_ROUND_CLOSEST(hsync, GTF_CELL_GRAN) * GTF_CELL_GRAN;
776 h_fp = h_blank / 2 - hsync;
778 fmt->type = V4L2_DV_BT_656_1120;
779 fmt->bt.polarities = polarities;
780 fmt->bt.width = image_width;
781 fmt->bt.height = image_height;
782 fmt->bt.hfrontporch = h_fp;
783 fmt->bt.vfrontporch = v_fp;
784 fmt->bt.hsync = hsync;
785 fmt->bt.vsync = vsync;
786 fmt->bt.hbackporch = frame_width - image_width - h_fp - hsync;
789 fmt->bt.vbackporch = frame_height - image_height - v_fp - vsync;
790 fmt->bt.interlaced = V4L2_DV_PROGRESSIVE;
792 fmt->bt.vbackporch = (frame_height - image_height - 2 * v_fp -
794 fmt->bt.il_vbackporch = frame_height - image_height - 2 * v_fp -
795 2 * vsync - fmt->bt.vbackporch;
796 fmt->bt.il_vfrontporch = v_fp;
797 fmt->bt.il_vsync = vsync;
798 fmt->bt.flags |= V4L2_DV_FL_HALF_LINE;
799 fmt->bt.interlaced = V4L2_DV_INTERLACED;
802 fmt->bt.pixelclock = pix_clk;
803 fmt->bt.standards = V4L2_DV_BT_STD_GTF;
806 fmt->bt.flags |= V4L2_DV_FL_REDUCED_BLANKING;
810 EXPORT_SYMBOL_GPL(v4l2_detect_gtf);
812 /** v4l2_calc_aspect_ratio - calculate the aspect ratio based on bytes
813 * 0x15 and 0x16 from the EDID.
814 * @hor_landscape - byte 0x15 from the EDID.
815 * @vert_portrait - byte 0x16 from the EDID.
817 * Determines the aspect ratio from the EDID.
818 * See VESA Enhanced EDID standard, release A, rev 2, section 3.6.2:
819 * "Horizontal and Vertical Screen Size or Aspect Ratio"
821 struct v4l2_fract v4l2_calc_aspect_ratio(u8 hor_landscape, u8 vert_portrait)
823 struct v4l2_fract aspect = { 16, 9 };
826 /* Nothing filled in, fallback to 16:9 */
827 if (!hor_landscape && !vert_portrait)
829 /* Both filled in, so they are interpreted as the screen size in cm */
830 if (hor_landscape && vert_portrait) {
831 aspect.numerator = hor_landscape;
832 aspect.denominator = vert_portrait;
835 /* Only one is filled in, so interpret them as a ratio:
837 ratio = hor_landscape | vert_portrait;
838 /* Change some rounded values into the exact aspect ratio */
840 aspect.numerator = 16;
841 aspect.denominator = 9;
842 } else if (ratio == 34) {
843 aspect.numerator = 4;
844 aspect.denominator = 3;
845 } else if (ratio == 68) {
846 aspect.numerator = 15;
847 aspect.denominator = 9;
849 aspect.numerator = hor_landscape + 99;
850 aspect.denominator = 100;
854 /* The aspect ratio is for portrait, so swap numerator and denominator */
855 swap(aspect.denominator, aspect.numerator);
858 EXPORT_SYMBOL_GPL(v4l2_calc_aspect_ratio);
860 /** v4l2_hdmi_rx_colorimetry - determine HDMI colorimetry information
861 * based on various InfoFrames.
862 * @avi: the AVI InfoFrame
863 * @hdmi: the HDMI Vendor InfoFrame, may be NULL
864 * @height: the frame height
866 * Determines the HDMI colorimetry information, i.e. how the HDMI
867 * pixel color data should be interpreted.
869 * Note that some of the newer features (DCI-P3, HDR) are not yet
870 * implemented: the hdmi.h header needs to be updated to the HDMI 2.0
871 * and CTA-861-G standards.
873 struct v4l2_hdmi_colorimetry
874 v4l2_hdmi_rx_colorimetry(const struct hdmi_avi_infoframe *avi,
875 const struct hdmi_vendor_infoframe *hdmi,
878 struct v4l2_hdmi_colorimetry c = {
879 V4L2_COLORSPACE_SRGB,
880 V4L2_YCBCR_ENC_DEFAULT,
881 V4L2_QUANTIZATION_FULL_RANGE,
884 bool is_ce = avi->video_code || (hdmi && hdmi->vic);
885 bool is_sdtv = height <= 576;
886 bool default_is_lim_range_rgb = avi->video_code > 1;
888 switch (avi->colorspace) {
889 case HDMI_COLORSPACE_RGB:
890 /* RGB pixel encoding */
891 switch (avi->colorimetry) {
892 case HDMI_COLORIMETRY_EXTENDED:
893 switch (avi->extended_colorimetry) {
894 case HDMI_EXTENDED_COLORIMETRY_OPRGB:
895 c.colorspace = V4L2_COLORSPACE_OPRGB;
896 c.xfer_func = V4L2_XFER_FUNC_OPRGB;
898 case HDMI_EXTENDED_COLORIMETRY_BT2020:
899 c.colorspace = V4L2_COLORSPACE_BT2020;
900 c.xfer_func = V4L2_XFER_FUNC_709;
909 switch (avi->quantization_range) {
910 case HDMI_QUANTIZATION_RANGE_LIMITED:
911 c.quantization = V4L2_QUANTIZATION_LIM_RANGE;
913 case HDMI_QUANTIZATION_RANGE_FULL:
916 if (default_is_lim_range_rgb)
917 c.quantization = V4L2_QUANTIZATION_LIM_RANGE;
923 /* YCbCr pixel encoding */
924 c.quantization = V4L2_QUANTIZATION_LIM_RANGE;
925 switch (avi->colorimetry) {
926 case HDMI_COLORIMETRY_NONE:
930 c.colorspace = V4L2_COLORSPACE_SMPTE170M;
931 c.ycbcr_enc = V4L2_YCBCR_ENC_601;
933 c.colorspace = V4L2_COLORSPACE_REC709;
934 c.ycbcr_enc = V4L2_YCBCR_ENC_709;
936 c.xfer_func = V4L2_XFER_FUNC_709;
938 case HDMI_COLORIMETRY_ITU_601:
939 c.colorspace = V4L2_COLORSPACE_SMPTE170M;
940 c.ycbcr_enc = V4L2_YCBCR_ENC_601;
941 c.xfer_func = V4L2_XFER_FUNC_709;
943 case HDMI_COLORIMETRY_ITU_709:
944 c.colorspace = V4L2_COLORSPACE_REC709;
945 c.ycbcr_enc = V4L2_YCBCR_ENC_709;
946 c.xfer_func = V4L2_XFER_FUNC_709;
948 case HDMI_COLORIMETRY_EXTENDED:
949 switch (avi->extended_colorimetry) {
950 case HDMI_EXTENDED_COLORIMETRY_XV_YCC_601:
951 c.colorspace = V4L2_COLORSPACE_REC709;
952 c.ycbcr_enc = V4L2_YCBCR_ENC_XV709;
953 c.xfer_func = V4L2_XFER_FUNC_709;
955 case HDMI_EXTENDED_COLORIMETRY_XV_YCC_709:
956 c.colorspace = V4L2_COLORSPACE_REC709;
957 c.ycbcr_enc = V4L2_YCBCR_ENC_XV601;
958 c.xfer_func = V4L2_XFER_FUNC_709;
960 case HDMI_EXTENDED_COLORIMETRY_S_YCC_601:
961 c.colorspace = V4L2_COLORSPACE_SRGB;
962 c.ycbcr_enc = V4L2_YCBCR_ENC_601;
963 c.xfer_func = V4L2_XFER_FUNC_SRGB;
965 case HDMI_EXTENDED_COLORIMETRY_OPYCC_601:
966 c.colorspace = V4L2_COLORSPACE_OPRGB;
967 c.ycbcr_enc = V4L2_YCBCR_ENC_601;
968 c.xfer_func = V4L2_XFER_FUNC_OPRGB;
970 case HDMI_EXTENDED_COLORIMETRY_BT2020:
971 c.colorspace = V4L2_COLORSPACE_BT2020;
972 c.ycbcr_enc = V4L2_YCBCR_ENC_BT2020;
973 c.xfer_func = V4L2_XFER_FUNC_709;
975 case HDMI_EXTENDED_COLORIMETRY_BT2020_CONST_LUM:
976 c.colorspace = V4L2_COLORSPACE_BT2020;
977 c.ycbcr_enc = V4L2_YCBCR_ENC_BT2020_CONST_LUM;
978 c.xfer_func = V4L2_XFER_FUNC_709;
980 default: /* fall back to ITU_709 */
981 c.colorspace = V4L2_COLORSPACE_REC709;
982 c.ycbcr_enc = V4L2_YCBCR_ENC_709;
983 c.xfer_func = V4L2_XFER_FUNC_709;
991 * YCC Quantization Range signaling is more-or-less broken,
992 * let's just ignore this.
998 EXPORT_SYMBOL_GPL(v4l2_hdmi_rx_colorimetry);
1001 * v4l2_get_edid_phys_addr() - find and return the physical address
1003 * @edid: pointer to the EDID data
1004 * @size: size in bytes of the EDID data
1005 * @offset: If not %NULL then the location of the physical address
1006 * bytes in the EDID will be returned here. This is set to 0
1007 * if there is no physical address found.
1009 * Return: the physical address or CEC_PHYS_ADDR_INVALID if there is none.
1011 u16 v4l2_get_edid_phys_addr(const u8 *edid, unsigned int size,
1012 unsigned int *offset)
1014 unsigned int loc = cec_get_edid_spa_location(edid, size);
1019 return CEC_PHYS_ADDR_INVALID;
1020 return (edid[loc] << 8) | edid[loc + 1];
1022 EXPORT_SYMBOL_GPL(v4l2_get_edid_phys_addr);
1025 * v4l2_set_edid_phys_addr() - find and set the physical address
1027 * @edid: pointer to the EDID data
1028 * @size: size in bytes of the EDID data
1029 * @phys_addr: the new physical address
1031 * This function finds the location of the physical address in the EDID
1032 * and fills in the given physical address and updates the checksum
1033 * at the end of the EDID block. It does nothing if the EDID doesn't
1034 * contain a physical address.
1036 void v4l2_set_edid_phys_addr(u8 *edid, unsigned int size, u16 phys_addr)
1038 unsigned int loc = cec_get_edid_spa_location(edid, size);
1044 edid[loc] = phys_addr >> 8;
1045 edid[loc + 1] = phys_addr & 0xff;
1048 /* update the checksum */
1049 for (i = loc; i < loc + 127; i++)
1051 edid[i] = 256 - sum;
1053 EXPORT_SYMBOL_GPL(v4l2_set_edid_phys_addr);
1056 * v4l2_phys_addr_for_input() - calculate the PA for an input
1058 * @phys_addr: the physical address of the parent
1059 * @input: the number of the input port, must be between 1 and 15
1061 * This function calculates a new physical address based on the input
1062 * port number. For example:
1064 * PA = 0.0.0.0 and input = 2 becomes 2.0.0.0
1066 * PA = 3.0.0.0 and input = 1 becomes 3.1.0.0
1068 * PA = 3.2.1.0 and input = 5 becomes 3.2.1.5
1070 * PA = 3.2.1.3 and input = 5 becomes f.f.f.f since it maxed out the depth.
1072 * Return: the new physical address or CEC_PHYS_ADDR_INVALID.
1074 u16 v4l2_phys_addr_for_input(u16 phys_addr, u8 input)
1076 /* Check if input is sane */
1077 if (WARN_ON(input == 0 || input > 0xf))
1078 return CEC_PHYS_ADDR_INVALID;
1083 if ((phys_addr & 0x0fff) == 0)
1084 return phys_addr | (input << 8);
1086 if ((phys_addr & 0x00ff) == 0)
1087 return phys_addr | (input << 4);
1089 if ((phys_addr & 0x000f) == 0)
1090 return phys_addr | input;
1093 * All nibbles are used so no valid physical addresses can be assigned
1096 return CEC_PHYS_ADDR_INVALID;
1098 EXPORT_SYMBOL_GPL(v4l2_phys_addr_for_input);
1101 * v4l2_phys_addr_validate() - validate a physical address from an EDID
1103 * @phys_addr: the physical address to validate
1104 * @parent: if not %NULL, then this is filled with the parents PA.
1105 * @port: if not %NULL, then this is filled with the input port.
1107 * This validates a physical address as read from an EDID. If the
1108 * PA is invalid (such as 1.0.1.0 since '0' is only allowed at the end),
1109 * then it will return -EINVAL.
1111 * The parent PA is passed into %parent and the input port is passed into
1112 * %port. For example:
1114 * PA = 0.0.0.0: has parent 0.0.0.0 and input port 0.
1116 * PA = 1.0.0.0: has parent 0.0.0.0 and input port 1.
1118 * PA = 3.2.0.0: has parent 3.0.0.0 and input port 2.
1120 * PA = f.f.f.f: has parent f.f.f.f and input port 0.
1122 * Return: 0 if the PA is valid, -EINVAL if not.
1124 int v4l2_phys_addr_validate(u16 phys_addr, u16 *parent, u16 *port)
1129 *parent = phys_addr;
1132 if (phys_addr == CEC_PHYS_ADDR_INVALID)
1134 for (i = 0; i < 16; i += 4)
1135 if (phys_addr & (0xf << i))
1140 *parent = phys_addr & (0xfff0 << i);
1142 *port = (phys_addr >> i) & 0xf;
1143 for (i += 4; i < 16; i += 4)
1144 if ((phys_addr & (0xf << i)) == 0)
1148 EXPORT_SYMBOL_GPL(v4l2_phys_addr_validate);