1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * v4l2-dv-timings - dv-timings helper functions
4 *
5 * Copyright 2013 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
6 */
7
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>
19
20MODULE_AUTHOR("Hans Verkuil");
21MODULE_DESCRIPTION("V4L2 DV Timings Helper Functions");
22MODULE_LICENSE("GPL");
23
24const 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,
136 { }
137};
138EXPORT_SYMBOL_GPL(v4l2_dv_timings_presets);
139
140bool 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,
143 void *fnc_handle)
144{
145 const struct v4l2_bt_timings *bt = &t->bt;
146 const struct v4l2_bt_timings_cap *cap = &dvcap->bt;
147 u32 caps = cap->capabilities;
148 const u32 max_vert = 10240;
149 u32 max_hor = 3 * bt->width;
150
151 if (t->type != V4L2_DV_BT_656_1120)
152 return false;
153 if (t->type != dvcap->type ||
154 bt->height < cap->min_height ||
155 bt->height > cap->max_height ||
156 bt->width < cap->min_width ||
157 bt->width > cap->max_width ||
158 bt->pixelclock < cap->min_pixelclock ||
159 bt->pixelclock > cap->max_pixelclock ||
160 (!(caps & V4L2_DV_BT_CAP_CUSTOM) &&
161 cap->standards && bt->standards &&
162 !(bt->standards & cap->standards)) ||
163 (bt->interlaced && !(caps & V4L2_DV_BT_CAP_INTERLACED)) ||
164 (!bt->interlaced && !(caps & V4L2_DV_BT_CAP_PROGRESSIVE)))
165 return false;
166
167 /* sanity checks for the blanking timings */
168 if (!bt->interlaced &&
169 (bt->il_vbackporch || bt->il_vsync || bt->il_vfrontporch))
170 return false;
171 /*
172 * Some video receivers cannot properly separate the frontporch,
173 * backporch and sync values, and instead they only have the total
174 * blanking. That can be assigned to any of these three fields.
175 * So just check that none of these are way out of range.
176 */
177 if (bt->hfrontporch > max_hor ||
178 bt->hsync > max_hor || bt->hbackporch > max_hor)
179 return false;
180 if (bt->vfrontporch > max_vert ||
181 bt->vsync > max_vert || bt->vbackporch > max_vert)
182 return false;
183 if (bt->interlaced && (bt->il_vfrontporch > max_vert ||
184 bt->il_vsync > max_vert || bt->il_vbackporch > max_vert))
185 return false;
186 return fnc == NULL || fnc(t, fnc_handle);
187}
188EXPORT_SYMBOL_GPL(v4l2_valid_dv_timings);
189
190int v4l2_enum_dv_timings_cap(struct v4l2_enum_dv_timings *t,
191 const struct v4l2_dv_timings_cap *cap,
192 v4l2_check_dv_timings_fnc fnc,
193 void *fnc_handle)
194{
195 u32 i, idx;
196
197 memset(t->reserved, 0, sizeof(t->reserved));
198 for (i = idx = 0; v4l2_dv_timings_presets[i].bt.width; i++) {
199 if (v4l2_valid_dv_timings(v4l2_dv_timings_presets + i, cap,
200 fnc, fnc_handle) &&
201 idx++ == t->index) {
202 t->timings = v4l2_dv_timings_presets[i];
203 return 0;
204 }
205 }
206 return -EINVAL;
207}
208EXPORT_SYMBOL_GPL(v4l2_enum_dv_timings_cap);
209
210bool v4l2_find_dv_timings_cap(struct v4l2_dv_timings *t,
211 const struct v4l2_dv_timings_cap *cap,
212 unsigned pclock_delta,
213 v4l2_check_dv_timings_fnc fnc,
214 void *fnc_handle)
215{
216 int i;
217
218 if (!v4l2_valid_dv_timings(t, cap, fnc, fnc_handle))
219 return false;
220
221 for (i = 0; v4l2_dv_timings_presets[i].bt.width; i++) {
222 if (v4l2_valid_dv_timings(v4l2_dv_timings_presets + i, cap,
223 fnc, fnc_handle) &&
224 v4l2_match_dv_timings(measured: t, standard: v4l2_dv_timings_presets + i,
225 pclock_delta, match_reduced_fps: false)) {
226 u32 flags = t->bt.flags & V4L2_DV_FL_REDUCED_FPS;
227
228 *t = v4l2_dv_timings_presets[i];
229 if (can_reduce_fps(bt: &t->bt))
230 t->bt.flags |= flags;
231
232 return true;
233 }
234 }
235 return false;
236}
237EXPORT_SYMBOL_GPL(v4l2_find_dv_timings_cap);
238
239bool v4l2_find_dv_timings_cea861_vic(struct v4l2_dv_timings *t, u8 vic)
240{
241 unsigned int i;
242
243 for (i = 0; v4l2_dv_timings_presets[i].bt.width; i++) {
244 const struct v4l2_bt_timings *bt =
245 &v4l2_dv_timings_presets[i].bt;
246
247 if ((bt->flags & V4L2_DV_FL_HAS_CEA861_VIC) &&
248 bt->cea861_vic == vic) {
249 *t = v4l2_dv_timings_presets[i];
250 return true;
251 }
252 }
253 return false;
254}
255EXPORT_SYMBOL_GPL(v4l2_find_dv_timings_cea861_vic);
256
257/**
258 * v4l2_match_dv_timings - check if two timings match
259 * @t1: compare this v4l2_dv_timings struct...
260 * @t2: with this struct.
261 * @pclock_delta: the allowed pixelclock deviation.
262 * @match_reduced_fps: if true, then fail if V4L2_DV_FL_REDUCED_FPS does not
263 * match.
264 *
265 * Compare t1 with t2 with a given margin of error for the pixelclock.
266 */
267bool v4l2_match_dv_timings(const struct v4l2_dv_timings *t1,
268 const struct v4l2_dv_timings *t2,
269 unsigned pclock_delta, bool match_reduced_fps)
270{
271 if (t1->type != t2->type || t1->type != V4L2_DV_BT_656_1120)
272 return false;
273 if (t1->bt.width == t2->bt.width &&
274 t1->bt.height == t2->bt.height &&
275 t1->bt.interlaced == t2->bt.interlaced &&
276 t1->bt.polarities == t2->bt.polarities &&
277 t1->bt.pixelclock >= t2->bt.pixelclock - pclock_delta &&
278 t1->bt.pixelclock <= t2->bt.pixelclock + pclock_delta &&
279 t1->bt.hfrontporch == t2->bt.hfrontporch &&
280 t1->bt.hsync == t2->bt.hsync &&
281 t1->bt.hbackporch == t2->bt.hbackporch &&
282 t1->bt.vfrontporch == t2->bt.vfrontporch &&
283 t1->bt.vsync == t2->bt.vsync &&
284 t1->bt.vbackporch == t2->bt.vbackporch &&
285 (!match_reduced_fps ||
286 (t1->bt.flags & V4L2_DV_FL_REDUCED_FPS) ==
287 (t2->bt.flags & V4L2_DV_FL_REDUCED_FPS)) &&
288 (!t1->bt.interlaced ||
289 (t1->bt.il_vfrontporch == t2->bt.il_vfrontporch &&
290 t1->bt.il_vsync == t2->bt.il_vsync &&
291 t1->bt.il_vbackporch == t2->bt.il_vbackporch)))
292 return true;
293 return false;
294}
295EXPORT_SYMBOL_GPL(v4l2_match_dv_timings);
296
297void v4l2_print_dv_timings(const char *dev_prefix, const char *prefix,
298 const struct v4l2_dv_timings *t, bool detailed)
299{
300 const struct v4l2_bt_timings *bt = &t->bt;
301 u32 htot, vtot;
302 u32 fps;
303
304 if (t->type != V4L2_DV_BT_656_1120)
305 return;
306
307 htot = V4L2_DV_BT_FRAME_WIDTH(bt);
308 vtot = V4L2_DV_BT_FRAME_HEIGHT(bt);
309 if (bt->interlaced)
310 vtot /= 2;
311
312 fps = (htot * vtot) > 0 ? div_u64(dividend: (100 * (u64)bt->pixelclock),
313 divisor: (htot * vtot)) : 0;
314
315 if (prefix == NULL)
316 prefix = "";
317
318 pr_info("%s: %s%ux%u%s%u.%02u (%ux%u)\n", dev_prefix, prefix,
319 bt->width, bt->height, bt->interlaced ? "i" : "p",
320 fps / 100, fps % 100, htot, vtot);
321
322 if (!detailed)
323 return;
324
325 pr_info("%s: horizontal: fp = %u, %ssync = %u, bp = %u\n",
326 dev_prefix, bt->hfrontporch,
327 (bt->polarities & V4L2_DV_HSYNC_POS_POL) ? "+" : "-",
328 bt->hsync, bt->hbackporch);
329 pr_info("%s: vertical: fp = %u, %ssync = %u, bp = %u\n",
330 dev_prefix, bt->vfrontporch,
331 (bt->polarities & V4L2_DV_VSYNC_POS_POL) ? "+" : "-",
332 bt->vsync, bt->vbackporch);
333 if (bt->interlaced)
334 pr_info("%s: vertical bottom field: fp = %u, %ssync = %u, bp = %u\n",
335 dev_prefix, bt->il_vfrontporch,
336 (bt->polarities & V4L2_DV_VSYNC_POS_POL) ? "+" : "-",
337 bt->il_vsync, bt->il_vbackporch);
338 pr_info("%s: pixelclock: %llu\n", dev_prefix, bt->pixelclock);
339 pr_info("%s: flags (0x%x):%s%s%s%s%s%s%s%s%s%s\n",
340 dev_prefix, bt->flags,
341 (bt->flags & V4L2_DV_FL_REDUCED_BLANKING) ?
342 " REDUCED_BLANKING" : "",
343 ((bt->flags & V4L2_DV_FL_REDUCED_BLANKING) &&
344 bt->vsync == 8) ? " (V2)" : "",
345 (bt->flags & V4L2_DV_FL_CAN_REDUCE_FPS) ?
346 " CAN_REDUCE_FPS" : "",
347 (bt->flags & V4L2_DV_FL_REDUCED_FPS) ?
348 " REDUCED_FPS" : "",
349 (bt->flags & V4L2_DV_FL_HALF_LINE) ?
350 " HALF_LINE" : "",
351 (bt->flags & V4L2_DV_FL_IS_CE_VIDEO) ?
352 " CE_VIDEO" : "",
353 (bt->flags & V4L2_DV_FL_FIRST_FIELD_EXTRA_LINE) ?
354 " FIRST_FIELD_EXTRA_LINE" : "",
355 (bt->flags & V4L2_DV_FL_HAS_PICTURE_ASPECT) ?
356 " HAS_PICTURE_ASPECT" : "",
357 (bt->flags & V4L2_DV_FL_HAS_CEA861_VIC) ?
358 " HAS_CEA861_VIC" : "",
359 (bt->flags & V4L2_DV_FL_HAS_HDMI_VIC) ?
360 " HAS_HDMI_VIC" : "");
361 pr_info("%s: standards (0x%x):%s%s%s%s%s\n", dev_prefix, bt->standards,
362 (bt->standards & V4L2_DV_BT_STD_CEA861) ? " CEA" : "",
363 (bt->standards & V4L2_DV_BT_STD_DMT) ? " DMT" : "",
364 (bt->standards & V4L2_DV_BT_STD_CVT) ? " CVT" : "",
365 (bt->standards & V4L2_DV_BT_STD_GTF) ? " GTF" : "",
366 (bt->standards & V4L2_DV_BT_STD_SDI) ? " SDI" : "");
367 if (bt->flags & V4L2_DV_FL_HAS_PICTURE_ASPECT)
368 pr_info("%s: picture aspect (hor:vert): %u:%u\n", dev_prefix,
369 bt->picture_aspect.numerator,
370 bt->picture_aspect.denominator);
371 if (bt->flags & V4L2_DV_FL_HAS_CEA861_VIC)
372 pr_info("%s: CEA-861 VIC: %u\n", dev_prefix, bt->cea861_vic);
373 if (bt->flags & V4L2_DV_FL_HAS_HDMI_VIC)
374 pr_info("%s: HDMI VIC: %u\n", dev_prefix, bt->hdmi_vic);
375}
376EXPORT_SYMBOL_GPL(v4l2_print_dv_timings);
377
378struct v4l2_fract v4l2_dv_timings_aspect_ratio(const struct v4l2_dv_timings *t)
379{
380 struct v4l2_fract ratio = { 1, 1 };
381 unsigned long n, d;
382
383 if (t->type != V4L2_DV_BT_656_1120)
384 return ratio;
385 if (!(t->bt.flags & V4L2_DV_FL_HAS_PICTURE_ASPECT))
386 return ratio;
387
388 ratio.numerator = t->bt.width * t->bt.picture_aspect.denominator;
389 ratio.denominator = t->bt.height * t->bt.picture_aspect.numerator;
390
391 rational_best_approximation(given_numerator: ratio.numerator, given_denominator: ratio.denominator,
392 max_numerator: ratio.numerator, max_denominator: ratio.denominator, best_numerator: &n, best_denominator: &d);
393 ratio.numerator = n;
394 ratio.denominator = d;
395 return ratio;
396}
397EXPORT_SYMBOL_GPL(v4l2_dv_timings_aspect_ratio);
398
399/** v4l2_calc_timeperframe - helper function to calculate timeperframe based
400 * v4l2_dv_timings fields.
401 * @t - Timings for the video mode.
402 *
403 * Calculates the expected timeperframe using the pixel clock value and
404 * horizontal/vertical measures. This means that v4l2_dv_timings structure
405 * must be correctly and fully filled.
406 */
407struct v4l2_fract v4l2_calc_timeperframe(const struct v4l2_dv_timings *t)
408{
409 const struct v4l2_bt_timings *bt = &t->bt;
410 struct v4l2_fract fps_fract = { 1, 1 };
411 unsigned long n, d;
412 u32 htot, vtot, fps;
413 u64 pclk;
414
415 if (t->type != V4L2_DV_BT_656_1120)
416 return fps_fract;
417
418 htot = V4L2_DV_BT_FRAME_WIDTH(bt);
419 vtot = V4L2_DV_BT_FRAME_HEIGHT(bt);
420 pclk = bt->pixelclock;
421
422 if ((bt->flags & V4L2_DV_FL_CAN_DETECT_REDUCED_FPS) &&
423 (bt->flags & V4L2_DV_FL_REDUCED_FPS))
424 pclk = div_u64(dividend: pclk * 1000ULL, divisor: 1001);
425
426 fps = (htot * vtot) > 0 ? div_u64(dividend: (100 * pclk), divisor: (htot * vtot)) : 0;
427 if (!fps)
428 return fps_fract;
429
430 rational_best_approximation(given_numerator: fps, given_denominator: 100, max_numerator: fps, max_denominator: 100, best_numerator: &n, best_denominator: &d);
431
432 fps_fract.numerator = d;
433 fps_fract.denominator = n;
434 return fps_fract;
435}
436EXPORT_SYMBOL_GPL(v4l2_calc_timeperframe);
437
438/*
439 * CVT defines
440 * Based on Coordinated Video Timings Standard
441 * version 1.1 September 10, 2003
442 */
443
444#define CVT_PXL_CLK_GRAN 250000 /* pixel clock granularity */
445#define CVT_PXL_CLK_GRAN_RB_V2 1000 /* granularity for reduced blanking v2*/
446
447/* Normal blanking */
448#define CVT_MIN_V_BPORCH 7 /* lines */
449#define CVT_MIN_V_PORCH_RND 3 /* lines */
450#define CVT_MIN_VSYNC_BP 550 /* min time of vsync + back porch (us) */
451#define CVT_HSYNC_PERCENT 8 /* nominal hsync as percentage of line */
452
453/* Normal blanking for CVT uses GTF to calculate horizontal blanking */
454#define CVT_CELL_GRAN 8 /* character cell granularity */
455#define CVT_M 600 /* blanking formula gradient */
456#define CVT_C 40 /* blanking formula offset */
457#define CVT_K 128 /* blanking formula scaling factor */
458#define CVT_J 20 /* blanking formula scaling factor */
459#define CVT_C_PRIME (((CVT_C - CVT_J) * CVT_K / 256) + CVT_J)
460#define CVT_M_PRIME (CVT_K * CVT_M / 256)
461
462/* Reduced Blanking */
463#define CVT_RB_MIN_V_BPORCH 7 /* lines */
464#define CVT_RB_V_FPORCH 3 /* lines */
465#define CVT_RB_MIN_V_BLANK 460 /* us */
466#define CVT_RB_H_SYNC 32 /* pixels */
467#define CVT_RB_H_BLANK 160 /* pixels */
468/* Reduce blanking Version 2 */
469#define CVT_RB_V2_H_BLANK 80 /* pixels */
470#define CVT_RB_MIN_V_FPORCH 3 /* lines */
471#define CVT_RB_V2_MIN_V_FPORCH 1 /* lines */
472#define CVT_RB_V_BPORCH 6 /* lines */
473
474/** v4l2_detect_cvt - detect if the given timings follow the CVT standard
475 * @frame_height - the total height of the frame (including blanking) in lines.
476 * @hfreq - the horizontal frequency in Hz.
477 * @vsync - the height of the vertical sync in lines.
478 * @active_width - active width of image (does not include blanking). This
479 * information is needed only in case of version 2 of reduced blanking.
480 * In other cases, this parameter does not have any effect on timings.
481 * @polarities - the horizontal and vertical polarities (same as struct
482 * v4l2_bt_timings polarities).
483 * @interlaced - if this flag is true, it indicates interlaced format
484 * @cap - the v4l2_dv_timings_cap capabilities.
485 * @timings - the resulting timings.
486 *
487 * This function will attempt to detect if the given values correspond to a
488 * valid CVT format. If so, then it will return true, and fmt will be filled
489 * in with the found CVT timings.
490 */
491bool v4l2_detect_cvt(unsigned int frame_height,
492 unsigned int hfreq,
493 unsigned int vsync,
494 unsigned int active_width,
495 u32 polarities,
496 bool interlaced,
497 const struct v4l2_dv_timings_cap *cap,
498 struct v4l2_dv_timings *timings)
499{
500 struct v4l2_dv_timings t = {};
501 int v_fp, v_bp, h_fp, h_bp, hsync;
502 int frame_width, image_height, image_width;
503 bool reduced_blanking;
504 bool rb_v2 = false;
505 unsigned int pix_clk;
506
507 if (vsync < 4 || vsync > 8)
508 return false;
509
510 if (polarities == V4L2_DV_VSYNC_POS_POL)
511 reduced_blanking = false;
512 else if (polarities == V4L2_DV_HSYNC_POS_POL)
513 reduced_blanking = true;
514 else
515 return false;
516
517 if (reduced_blanking && vsync == 8)
518 rb_v2 = true;
519
520 if (rb_v2 && active_width == 0)
521 return false;
522
523 if (!rb_v2 && vsync > 7)
524 return false;
525
526 if (hfreq == 0)
527 return false;
528
529 /* Vertical */
530 if (reduced_blanking) {
531 if (rb_v2) {
532 v_bp = CVT_RB_V_BPORCH;
533 v_fp = (CVT_RB_MIN_V_BLANK * hfreq) / 1000000 + 1;
534 v_fp -= vsync + v_bp;
535
536 if (v_fp < CVT_RB_V2_MIN_V_FPORCH)
537 v_fp = CVT_RB_V2_MIN_V_FPORCH;
538 } else {
539 v_fp = CVT_RB_V_FPORCH;
540 v_bp = (CVT_RB_MIN_V_BLANK * hfreq) / 1000000 + 1;
541 v_bp -= vsync + v_fp;
542
543 if (v_bp < CVT_RB_MIN_V_BPORCH)
544 v_bp = CVT_RB_MIN_V_BPORCH;
545 }
546 } else {
547 v_fp = CVT_MIN_V_PORCH_RND;
548 v_bp = (CVT_MIN_VSYNC_BP * hfreq) / 1000000 + 1 - vsync;
549
550 if (v_bp < CVT_MIN_V_BPORCH)
551 v_bp = CVT_MIN_V_BPORCH;
552 }
553
554 if (interlaced)
555 image_height = (frame_height - 2 * v_fp - 2 * vsync - 2 * v_bp) & ~0x1;
556 else
557 image_height = (frame_height - v_fp - vsync - v_bp + 1) & ~0x1;
558
559 if (image_height < 0)
560 return false;
561
562 /* Aspect ratio based on vsync */
563 switch (vsync) {
564 case 4:
565 image_width = (image_height * 4) / 3;
566 break;
567 case 5:
568 image_width = (image_height * 16) / 9;
569 break;
570 case 6:
571 image_width = (image_height * 16) / 10;
572 break;
573 case 7:
574 /* special case */
575 if (image_height == 1024)
576 image_width = (image_height * 5) / 4;
577 else if (image_height == 768)
578 image_width = (image_height * 15) / 9;
579 else
580 return false;
581 break;
582 case 8:
583 image_width = active_width;
584 break;
585 default:
586 return false;
587 }
588
589 if (!rb_v2)
590 image_width = image_width & ~7;
591
592 /* Horizontal */
593 if (reduced_blanking) {
594 int h_blank;
595 int clk_gran;
596
597 h_blank = rb_v2 ? CVT_RB_V2_H_BLANK : CVT_RB_H_BLANK;
598 clk_gran = rb_v2 ? CVT_PXL_CLK_GRAN_RB_V2 : CVT_PXL_CLK_GRAN;
599
600 pix_clk = (image_width + h_blank) * hfreq;
601 pix_clk = (pix_clk / clk_gran) * clk_gran;
602
603 h_bp = h_blank / 2;
604 hsync = CVT_RB_H_SYNC;
605 h_fp = h_blank - h_bp - hsync;
606
607 frame_width = image_width + h_blank;
608 } else {
609 unsigned ideal_duty_cycle_per_myriad =
610 100 * CVT_C_PRIME - (CVT_M_PRIME * 100000) / hfreq;
611 int h_blank;
612
613 if (ideal_duty_cycle_per_myriad < 2000)
614 ideal_duty_cycle_per_myriad = 2000;
615
616 h_blank = image_width * ideal_duty_cycle_per_myriad /
617 (10000 - ideal_duty_cycle_per_myriad);
618 h_blank = (h_blank / (2 * CVT_CELL_GRAN)) * 2 * CVT_CELL_GRAN;
619
620 pix_clk = (image_width + h_blank) * hfreq;
621 pix_clk = (pix_clk / CVT_PXL_CLK_GRAN) * CVT_PXL_CLK_GRAN;
622
623 h_bp = h_blank / 2;
624 frame_width = image_width + h_blank;
625
626 hsync = frame_width * CVT_HSYNC_PERCENT / 100;
627 hsync = (hsync / CVT_CELL_GRAN) * CVT_CELL_GRAN;
628 h_fp = h_blank - hsync - h_bp;
629 }
630
631 t.type = V4L2_DV_BT_656_1120;
632 t.bt.polarities = polarities;
633 t.bt.width = image_width;
634 t.bt.height = image_height;
635 t.bt.hfrontporch = h_fp;
636 t.bt.vfrontporch = v_fp;
637 t.bt.hsync = hsync;
638 t.bt.vsync = vsync;
639 t.bt.hbackporch = frame_width - image_width - h_fp - hsync;
640
641 if (!interlaced) {
642 t.bt.vbackporch = frame_height - image_height - v_fp - vsync;
643 t.bt.interlaced = V4L2_DV_PROGRESSIVE;
644 } else {
645 t.bt.vbackporch = (frame_height - image_height - 2 * v_fp -
646 2 * vsync) / 2;
647 t.bt.il_vbackporch = frame_height - image_height - 2 * v_fp -
648 2 * vsync - t.bt.vbackporch;
649 t.bt.il_vfrontporch = v_fp;
650 t.bt.il_vsync = vsync;
651 t.bt.flags |= V4L2_DV_FL_HALF_LINE;
652 t.bt.interlaced = V4L2_DV_INTERLACED;
653 }
654
655 t.bt.pixelclock = pix_clk;
656 t.bt.standards = V4L2_DV_BT_STD_CVT;
657
658 if (reduced_blanking)
659 t.bt.flags |= V4L2_DV_FL_REDUCED_BLANKING;
660
661 if (!v4l2_valid_dv_timings(&t, cap, NULL, NULL))
662 return false;
663 *timings = t;
664 return true;
665}
666EXPORT_SYMBOL_GPL(v4l2_detect_cvt);
667
668/*
669 * GTF defines
670 * Based on Generalized Timing Formula Standard
671 * Version 1.1 September 2, 1999
672 */
673
674#define GTF_PXL_CLK_GRAN 250000 /* pixel clock granularity */
675
676#define GTF_MIN_VSYNC_BP 550 /* min time of vsync + back porch (us) */
677#define GTF_V_FP 1 /* vertical front porch (lines) */
678#define GTF_CELL_GRAN 8 /* character cell granularity */
679
680/* Default */
681#define GTF_D_M 600 /* blanking formula gradient */
682#define GTF_D_C 40 /* blanking formula offset */
683#define GTF_D_K 128 /* blanking formula scaling factor */
684#define GTF_D_J 20 /* blanking formula scaling factor */
685#define GTF_D_C_PRIME ((((GTF_D_C - GTF_D_J) * GTF_D_K) / 256) + GTF_D_J)
686#define GTF_D_M_PRIME ((GTF_D_K * GTF_D_M) / 256)
687
688/* Secondary */
689#define GTF_S_M 3600 /* blanking formula gradient */
690#define GTF_S_C 40 /* blanking formula offset */
691#define GTF_S_K 128 /* blanking formula scaling factor */
692#define GTF_S_J 35 /* blanking formula scaling factor */
693#define GTF_S_C_PRIME ((((GTF_S_C - GTF_S_J) * GTF_S_K) / 256) + GTF_S_J)
694#define GTF_S_M_PRIME ((GTF_S_K * GTF_S_M) / 256)
695
696/** v4l2_detect_gtf - detect if the given timings follow the GTF standard
697 * @frame_height - the total height of the frame (including blanking) in lines.
698 * @hfreq - the horizontal frequency in Hz.
699 * @vsync - the height of the vertical sync in lines.
700 * @polarities - the horizontal and vertical polarities (same as struct
701 * v4l2_bt_timings polarities).
702 * @interlaced - if this flag is true, it indicates interlaced format
703 * @aspect - preferred aspect ratio. GTF has no method of determining the
704 * aspect ratio in order to derive the image width from the
705 * image height, so it has to be passed explicitly. Usually
706 * the native screen aspect ratio is used for this. If it
707 * is not filled in correctly, then 16:9 will be assumed.
708 * @cap - the v4l2_dv_timings_cap capabilities.
709 * @timings - the resulting timings.
710 *
711 * This function will attempt to detect if the given values correspond to a
712 * valid GTF format. If so, then it will return true, and fmt will be filled
713 * in with the found GTF timings.
714 */
715bool v4l2_detect_gtf(unsigned int frame_height,
716 unsigned int hfreq,
717 unsigned int vsync,
718 u32 polarities,
719 bool interlaced,
720 struct v4l2_fract aspect,
721 const struct v4l2_dv_timings_cap *cap,
722 struct v4l2_dv_timings *timings)
723{
724 struct v4l2_dv_timings t = {};
725 int pix_clk;
726 int v_fp, v_bp, h_fp, hsync;
727 int frame_width, image_height, image_width;
728 bool default_gtf;
729 int h_blank;
730
731 if (vsync != 3)
732 return false;
733
734 if (polarities == V4L2_DV_VSYNC_POS_POL)
735 default_gtf = true;
736 else if (polarities == V4L2_DV_HSYNC_POS_POL)
737 default_gtf = false;
738 else
739 return false;
740
741 if (hfreq == 0)
742 return false;
743
744 /* Vertical */
745 v_fp = GTF_V_FP;
746 v_bp = (GTF_MIN_VSYNC_BP * hfreq + 500000) / 1000000 - vsync;
747 if (interlaced)
748 image_height = (frame_height - 2 * v_fp - 2 * vsync - 2 * v_bp) & ~0x1;
749 else
750 image_height = (frame_height - v_fp - vsync - v_bp + 1) & ~0x1;
751
752 if (image_height < 0)
753 return false;
754
755 if (aspect.numerator == 0 || aspect.denominator == 0) {
756 aspect.numerator = 16;
757 aspect.denominator = 9;
758 }
759 image_width = ((image_height * aspect.numerator) / aspect.denominator);
760 image_width = (image_width + GTF_CELL_GRAN/2) & ~(GTF_CELL_GRAN - 1);
761
762 /* Horizontal */
763 if (default_gtf) {
764 u64 num;
765 u32 den;
766
767 num = (((u64)image_width * GTF_D_C_PRIME * hfreq) -
768 ((u64)image_width * GTF_D_M_PRIME * 1000));
769 den = (hfreq * (100 - GTF_D_C_PRIME) + GTF_D_M_PRIME * 1000) *
770 (2 * GTF_CELL_GRAN);
771 h_blank = div_u64(dividend: (num + (den >> 1)), divisor: den);
772 h_blank *= (2 * GTF_CELL_GRAN);
773 } else {
774 u64 num;
775 u32 den;
776
777 num = (((u64)image_width * GTF_S_C_PRIME * hfreq) -
778 ((u64)image_width * GTF_S_M_PRIME * 1000));
779 den = (hfreq * (100 - GTF_S_C_PRIME) + GTF_S_M_PRIME * 1000) *
780 (2 * GTF_CELL_GRAN);
781 h_blank = div_u64(dividend: (num + (den >> 1)), divisor: den);
782 h_blank *= (2 * GTF_CELL_GRAN);
783 }
784
785 frame_width = image_width + h_blank;
786
787 pix_clk = (image_width + h_blank) * hfreq;
788 pix_clk = pix_clk / GTF_PXL_CLK_GRAN * GTF_PXL_CLK_GRAN;
789
790 hsync = (frame_width * 8 + 50) / 100;
791 hsync = DIV_ROUND_CLOSEST(hsync, GTF_CELL_GRAN) * GTF_CELL_GRAN;
792
793 h_fp = h_blank / 2 - hsync;
794
795 t.type = V4L2_DV_BT_656_1120;
796 t.bt.polarities = polarities;
797 t.bt.width = image_width;
798 t.bt.height = image_height;
799 t.bt.hfrontporch = h_fp;
800 t.bt.vfrontporch = v_fp;
801 t.bt.hsync = hsync;
802 t.bt.vsync = vsync;
803 t.bt.hbackporch = frame_width - image_width - h_fp - hsync;
804
805 if (!interlaced) {
806 t.bt.vbackporch = frame_height - image_height - v_fp - vsync;
807 t.bt.interlaced = V4L2_DV_PROGRESSIVE;
808 } else {
809 t.bt.vbackporch = (frame_height - image_height - 2 * v_fp -
810 2 * vsync) / 2;
811 t.bt.il_vbackporch = frame_height - image_height - 2 * v_fp -
812 2 * vsync - t.bt.vbackporch;
813 t.bt.il_vfrontporch = v_fp;
814 t.bt.il_vsync = vsync;
815 t.bt.flags |= V4L2_DV_FL_HALF_LINE;
816 t.bt.interlaced = V4L2_DV_INTERLACED;
817 }
818
819 t.bt.pixelclock = pix_clk;
820 t.bt.standards = V4L2_DV_BT_STD_GTF;
821
822 if (!default_gtf)
823 t.bt.flags |= V4L2_DV_FL_REDUCED_BLANKING;
824
825 if (!v4l2_valid_dv_timings(&t, cap, NULL, NULL))
826 return false;
827 *timings = t;
828 return true;
829}
830EXPORT_SYMBOL_GPL(v4l2_detect_gtf);
831
832/** v4l2_calc_aspect_ratio - calculate the aspect ratio based on bytes
833 * 0x15 and 0x16 from the EDID.
834 * @hor_landscape - byte 0x15 from the EDID.
835 * @vert_portrait - byte 0x16 from the EDID.
836 *
837 * Determines the aspect ratio from the EDID.
838 * See VESA Enhanced EDID standard, release A, rev 2, section 3.6.2:
839 * "Horizontal and Vertical Screen Size or Aspect Ratio"
840 */
841struct v4l2_fract v4l2_calc_aspect_ratio(u8 hor_landscape, u8 vert_portrait)
842{
843 struct v4l2_fract aspect = { 16, 9 };
844 u8 ratio;
845
846 /* Nothing filled in, fallback to 16:9 */
847 if (!hor_landscape && !vert_portrait)
848 return aspect;
849 /* Both filled in, so they are interpreted as the screen size in cm */
850 if (hor_landscape && vert_portrait) {
851 aspect.numerator = hor_landscape;
852 aspect.denominator = vert_portrait;
853 return aspect;
854 }
855 /* Only one is filled in, so interpret them as a ratio:
856 (val + 99) / 100 */
857 ratio = hor_landscape | vert_portrait;
858 /* Change some rounded values into the exact aspect ratio */
859 if (ratio == 79) {
860 aspect.numerator = 16;
861 aspect.denominator = 9;
862 } else if (ratio == 34) {
863 aspect.numerator = 4;
864 aspect.denominator = 3;
865 } else if (ratio == 68) {
866 aspect.numerator = 15;
867 aspect.denominator = 9;
868 } else {
869 aspect.numerator = hor_landscape + 99;
870 aspect.denominator = 100;
871 }
872 if (hor_landscape)
873 return aspect;
874 /* The aspect ratio is for portrait, so swap numerator and denominator */
875 swap(aspect.denominator, aspect.numerator);
876 return aspect;
877}
878EXPORT_SYMBOL_GPL(v4l2_calc_aspect_ratio);
879
880/** v4l2_hdmi_rx_colorimetry - determine HDMI colorimetry information
881 * based on various InfoFrames.
882 * @avi: the AVI InfoFrame
883 * @hdmi: the HDMI Vendor InfoFrame, may be NULL
884 * @height: the frame height
885 *
886 * Determines the HDMI colorimetry information, i.e. how the HDMI
887 * pixel color data should be interpreted.
888 *
889 * Note that some of the newer features (DCI-P3, HDR) are not yet
890 * implemented: the hdmi.h header needs to be updated to the HDMI 2.0
891 * and CTA-861-G standards.
892 */
893struct v4l2_hdmi_colorimetry
894v4l2_hdmi_rx_colorimetry(const struct hdmi_avi_infoframe *avi,
895 const struct hdmi_vendor_infoframe *hdmi,
896 unsigned int height)
897{
898 struct v4l2_hdmi_colorimetry c = {
899 V4L2_COLORSPACE_SRGB,
900 V4L2_YCBCR_ENC_DEFAULT,
901 V4L2_QUANTIZATION_FULL_RANGE,
902 V4L2_XFER_FUNC_SRGB
903 };
904 bool is_ce = avi->video_code || (hdmi && hdmi->vic);
905 bool is_sdtv = height <= 576;
906 bool default_is_lim_range_rgb = avi->video_code > 1;
907
908 switch (avi->colorspace) {
909 case HDMI_COLORSPACE_RGB:
910 /* RGB pixel encoding */
911 switch (avi->colorimetry) {
912 case HDMI_COLORIMETRY_EXTENDED:
913 switch (avi->extended_colorimetry) {
914 case HDMI_EXTENDED_COLORIMETRY_OPRGB:
915 c.colorspace = V4L2_COLORSPACE_OPRGB;
916 c.xfer_func = V4L2_XFER_FUNC_OPRGB;
917 break;
918 case HDMI_EXTENDED_COLORIMETRY_BT2020:
919 c.colorspace = V4L2_COLORSPACE_BT2020;
920 c.xfer_func = V4L2_XFER_FUNC_709;
921 break;
922 default:
923 break;
924 }
925 break;
926 default:
927 break;
928 }
929 switch (avi->quantization_range) {
930 case HDMI_QUANTIZATION_RANGE_LIMITED:
931 c.quantization = V4L2_QUANTIZATION_LIM_RANGE;
932 break;
933 case HDMI_QUANTIZATION_RANGE_FULL:
934 break;
935 default:
936 if (default_is_lim_range_rgb)
937 c.quantization = V4L2_QUANTIZATION_LIM_RANGE;
938 break;
939 }
940 break;
941
942 default:
943 /* YCbCr pixel encoding */
944 c.quantization = V4L2_QUANTIZATION_LIM_RANGE;
945 switch (avi->colorimetry) {
946 case HDMI_COLORIMETRY_NONE:
947 if (!is_ce)
948 break;
949 if (is_sdtv) {
950 c.colorspace = V4L2_COLORSPACE_SMPTE170M;
951 c.ycbcr_enc = V4L2_YCBCR_ENC_601;
952 } else {
953 c.colorspace = V4L2_COLORSPACE_REC709;
954 c.ycbcr_enc = V4L2_YCBCR_ENC_709;
955 }
956 c.xfer_func = V4L2_XFER_FUNC_709;
957 break;
958 case HDMI_COLORIMETRY_ITU_601:
959 c.colorspace = V4L2_COLORSPACE_SMPTE170M;
960 c.ycbcr_enc = V4L2_YCBCR_ENC_601;
961 c.xfer_func = V4L2_XFER_FUNC_709;
962 break;
963 case HDMI_COLORIMETRY_ITU_709:
964 c.colorspace = V4L2_COLORSPACE_REC709;
965 c.ycbcr_enc = V4L2_YCBCR_ENC_709;
966 c.xfer_func = V4L2_XFER_FUNC_709;
967 break;
968 case HDMI_COLORIMETRY_EXTENDED:
969 switch (avi->extended_colorimetry) {
970 case HDMI_EXTENDED_COLORIMETRY_XV_YCC_601:
971 c.colorspace = V4L2_COLORSPACE_REC709;
972 c.ycbcr_enc = V4L2_YCBCR_ENC_XV709;
973 c.xfer_func = V4L2_XFER_FUNC_709;
974 break;
975 case HDMI_EXTENDED_COLORIMETRY_XV_YCC_709:
976 c.colorspace = V4L2_COLORSPACE_REC709;
977 c.ycbcr_enc = V4L2_YCBCR_ENC_XV601;
978 c.xfer_func = V4L2_XFER_FUNC_709;
979 break;
980 case HDMI_EXTENDED_COLORIMETRY_S_YCC_601:
981 c.colorspace = V4L2_COLORSPACE_SRGB;
982 c.ycbcr_enc = V4L2_YCBCR_ENC_601;
983 c.xfer_func = V4L2_XFER_FUNC_SRGB;
984 break;
985 case HDMI_EXTENDED_COLORIMETRY_OPYCC_601:
986 c.colorspace = V4L2_COLORSPACE_OPRGB;
987 c.ycbcr_enc = V4L2_YCBCR_ENC_601;
988 c.xfer_func = V4L2_XFER_FUNC_OPRGB;
989 break;
990 case HDMI_EXTENDED_COLORIMETRY_BT2020:
991 c.colorspace = V4L2_COLORSPACE_BT2020;
992 c.ycbcr_enc = V4L2_YCBCR_ENC_BT2020;
993 c.xfer_func = V4L2_XFER_FUNC_709;
994 break;
995 case HDMI_EXTENDED_COLORIMETRY_BT2020_CONST_LUM:
996 c.colorspace = V4L2_COLORSPACE_BT2020;
997 c.ycbcr_enc = V4L2_YCBCR_ENC_BT2020_CONST_LUM;
998 c.xfer_func = V4L2_XFER_FUNC_709;
999 break;
1000 default: /* fall back to ITU_709 */
1001 c.colorspace = V4L2_COLORSPACE_REC709;
1002 c.ycbcr_enc = V4L2_YCBCR_ENC_709;
1003 c.xfer_func = V4L2_XFER_FUNC_709;
1004 break;
1005 }
1006 break;
1007 default:
1008 break;
1009 }
1010 /*
1011 * YCC Quantization Range signaling is more-or-less broken,
1012 * let's just ignore this.
1013 */
1014 break;
1015 }
1016 return c;
1017}
1018EXPORT_SYMBOL_GPL(v4l2_hdmi_rx_colorimetry);
1019
1020/**
1021 * v4l2_num_edid_blocks() - return the number of EDID blocks
1022 *
1023 * @edid: pointer to the EDID data
1024 * @max_blocks: maximum number of supported EDID blocks
1025 *
1026 * Return: the number of EDID blocks based on the contents of the EDID.
1027 * This supports the HDMI Forum EDID Extension Override Data Block.
1028 */
1029unsigned int v4l2_num_edid_blocks(const u8 *edid, unsigned int max_blocks)
1030{
1031 unsigned int blocks;
1032
1033 if (!edid || !max_blocks)
1034 return 0;
1035
1036 // The number of extension blocks is recorded at byte 126 of the
1037 // first 128-byte block in the EDID.
1038 //
1039 // If there is an HDMI Forum EDID Extension Override Data Block
1040 // present, then it is in bytes 4-6 of the first CTA-861 extension
1041 // block of the EDID.
1042 blocks = edid[126] + 1;
1043 // Check for HDMI Forum EDID Extension Override Data Block
1044 if (blocks >= 2 && // The EDID must be at least 2 blocks
1045 max_blocks >= 3 && // The caller supports at least 3 blocks
1046 edid[128] == 2 && // The first extension block is type CTA-861
1047 edid[133] == 0x78 && // Identifier for the EEODB
1048 (edid[132] & 0xe0) == 0xe0 && // Tag Code == 7
1049 (edid[132] & 0x1f) >= 2 && // Length >= 2
1050 edid[134] > 1) // Number of extension blocks is sane
1051 blocks = edid[134] + 1;
1052 return blocks > max_blocks ? max_blocks : blocks;
1053}
1054EXPORT_SYMBOL_GPL(v4l2_num_edid_blocks);
1055
1056/**
1057 * v4l2_get_edid_phys_addr() - find and return the physical address
1058 *
1059 * @edid: pointer to the EDID data
1060 * @size: size in bytes of the EDID data
1061 * @offset: If not %NULL then the location of the physical address
1062 * bytes in the EDID will be returned here. This is set to 0
1063 * if there is no physical address found.
1064 *
1065 * Return: the physical address or CEC_PHYS_ADDR_INVALID if there is none.
1066 */
1067u16 v4l2_get_edid_phys_addr(const u8 *edid, unsigned int size,
1068 unsigned int *offset)
1069{
1070 unsigned int loc = cec_get_edid_spa_location(edid, size);
1071
1072 if (offset)
1073 *offset = loc;
1074 if (loc == 0)
1075 return CEC_PHYS_ADDR_INVALID;
1076 return (edid[loc] << 8) | edid[loc + 1];
1077}
1078EXPORT_SYMBOL_GPL(v4l2_get_edid_phys_addr);
1079
1080/**
1081 * v4l2_set_edid_phys_addr() - find and set the physical address
1082 *
1083 * @edid: pointer to the EDID data
1084 * @size: size in bytes of the EDID data
1085 * @phys_addr: the new physical address
1086 *
1087 * This function finds the location of the physical address in the EDID
1088 * and fills in the given physical address and updates the checksum
1089 * at the end of the EDID block. It does nothing if the EDID doesn't
1090 * contain a physical address.
1091 */
1092void v4l2_set_edid_phys_addr(u8 *edid, unsigned int size, u16 phys_addr)
1093{
1094 unsigned int loc = cec_get_edid_spa_location(edid, size);
1095 u8 sum = 0;
1096 unsigned int i;
1097
1098 if (loc == 0)
1099 return;
1100 edid[loc] = phys_addr >> 8;
1101 edid[loc + 1] = phys_addr & 0xff;
1102 loc &= ~0x7f;
1103
1104 /* update the checksum */
1105 for (i = loc; i < loc + 127; i++)
1106 sum += edid[i];
1107 edid[i] = 256 - sum;
1108}
1109EXPORT_SYMBOL_GPL(v4l2_set_edid_phys_addr);
1110
1111/**
1112 * v4l2_phys_addr_for_input() - calculate the PA for an input
1113 *
1114 * @phys_addr: the physical address of the parent
1115 * @input: the number of the input port, must be between 1 and 15
1116 *
1117 * This function calculates a new physical address based on the input
1118 * port number. For example:
1119 *
1120 * PA = 0.0.0.0 and input = 2 becomes 2.0.0.0
1121 *
1122 * PA = 3.0.0.0 and input = 1 becomes 3.1.0.0
1123 *
1124 * PA = 3.2.1.0 and input = 5 becomes 3.2.1.5
1125 *
1126 * PA = 3.2.1.3 and input = 5 becomes f.f.f.f since it maxed out the depth.
1127 *
1128 * Return: the new physical address or CEC_PHYS_ADDR_INVALID.
1129 */
1130u16 v4l2_phys_addr_for_input(u16 phys_addr, u8 input)
1131{
1132 /* Check if input is sane */
1133 if (WARN_ON(input == 0 || input > 0xf))
1134 return CEC_PHYS_ADDR_INVALID;
1135
1136 if (phys_addr == 0)
1137 return input << 12;
1138
1139 if ((phys_addr & 0x0fff) == 0)
1140 return phys_addr | (input << 8);
1141
1142 if ((phys_addr & 0x00ff) == 0)
1143 return phys_addr | (input << 4);
1144
1145 if ((phys_addr & 0x000f) == 0)
1146 return phys_addr | input;
1147
1148 /*
1149 * All nibbles are used so no valid physical addresses can be assigned
1150 * to the input.
1151 */
1152 return CEC_PHYS_ADDR_INVALID;
1153}
1154EXPORT_SYMBOL_GPL(v4l2_phys_addr_for_input);
1155
1156/**
1157 * v4l2_phys_addr_validate() - validate a physical address from an EDID
1158 *
1159 * @phys_addr: the physical address to validate
1160 * @parent: if not %NULL, then this is filled with the parents PA.
1161 * @port: if not %NULL, then this is filled with the input port.
1162 *
1163 * This validates a physical address as read from an EDID. If the
1164 * PA is invalid (such as 1.0.1.0 since '0' is only allowed at the end),
1165 * then it will return -EINVAL.
1166 *
1167 * The parent PA is passed into %parent and the input port is passed into
1168 * %port. For example:
1169 *
1170 * PA = 0.0.0.0: has parent 0.0.0.0 and input port 0.
1171 *
1172 * PA = 1.0.0.0: has parent 0.0.0.0 and input port 1.
1173 *
1174 * PA = 3.2.0.0: has parent 3.0.0.0 and input port 2.
1175 *
1176 * PA = f.f.f.f: has parent f.f.f.f and input port 0.
1177 *
1178 * Return: 0 if the PA is valid, -EINVAL if not.
1179 */
1180int v4l2_phys_addr_validate(u16 phys_addr, u16 *parent, u16 *port)
1181{
1182 int i;
1183
1184 if (parent)
1185 *parent = phys_addr;
1186 if (port)
1187 *port = 0;
1188 if (phys_addr == CEC_PHYS_ADDR_INVALID)
1189 return 0;
1190 for (i = 0; i < 16; i += 4)
1191 if (phys_addr & (0xf << i))
1192 break;
1193 if (i == 16)
1194 return 0;
1195 if (parent)
1196 *parent = phys_addr & (0xfff0 << i);
1197 if (port)
1198 *port = (phys_addr >> i) & 0xf;
1199 for (i += 4; i < 16; i += 4)
1200 if ((phys_addr & (0xf << i)) == 0)
1201 return -EINVAL;
1202 return 0;
1203}
1204EXPORT_SYMBOL_GPL(v4l2_phys_addr_validate);
1205
1206#ifdef CONFIG_DEBUG_FS
1207
1208#define DEBUGFS_FOPS(type, flag) \
1209static ssize_t \
1210infoframe_read_##type(struct file *filp, \
1211 char __user *ubuf, size_t count, loff_t *ppos) \
1212{ \
1213 struct v4l2_debugfs_if *infoframes = filp->private_data; \
1214 \
1215 return infoframes->if_read((flag), infoframes->priv, filp, \
1216 ubuf, count, ppos); \
1217} \
1218 \
1219static const struct file_operations infoframe_##type##_fops = { \
1220 .owner = THIS_MODULE, \
1221 .open = simple_open, \
1222 .read = infoframe_read_##type, \
1223}
1224
1225DEBUGFS_FOPS(avi, V4L2_DEBUGFS_IF_AVI);
1226DEBUGFS_FOPS(audio, V4L2_DEBUGFS_IF_AUDIO);
1227DEBUGFS_FOPS(spd, V4L2_DEBUGFS_IF_SPD);
1228DEBUGFS_FOPS(hdmi, V4L2_DEBUGFS_IF_HDMI);
1229DEBUGFS_FOPS(drm, V4L2_DEBUGFS_IF_DRM);
1230
1231struct v4l2_debugfs_if *v4l2_debugfs_if_alloc(struct dentry *root, u32 if_types,
1232 void *priv,
1233 v4l2_debugfs_if_read_t if_read)
1234{
1235 struct v4l2_debugfs_if *infoframes;
1236
1237 if (IS_ERR_OR_NULL(ptr: root) || !if_types || !if_read)
1238 return NULL;
1239
1240 infoframes = kzalloc(sizeof(*infoframes), GFP_KERNEL);
1241 if (!infoframes)
1242 return NULL;
1243
1244 infoframes->if_dir = debugfs_create_dir(name: "infoframes", parent: root);
1245 infoframes->priv = priv;
1246 infoframes->if_read = if_read;
1247 if (if_types & V4L2_DEBUGFS_IF_AVI)
1248 debugfs_create_file("avi", 0400, infoframes->if_dir,
1249 infoframes, &infoframe_avi_fops);
1250 if (if_types & V4L2_DEBUGFS_IF_AUDIO)
1251 debugfs_create_file("audio", 0400, infoframes->if_dir,
1252 infoframes, &infoframe_audio_fops);
1253 if (if_types & V4L2_DEBUGFS_IF_SPD)
1254 debugfs_create_file("spd", 0400, infoframes->if_dir,
1255 infoframes, &infoframe_spd_fops);
1256 if (if_types & V4L2_DEBUGFS_IF_HDMI)
1257 debugfs_create_file("hdmi", 0400, infoframes->if_dir,
1258 infoframes, &infoframe_hdmi_fops);
1259 if (if_types & V4L2_DEBUGFS_IF_DRM)
1260 debugfs_create_file("hdr_drm", 0400, infoframes->if_dir,
1261 infoframes, &infoframe_drm_fops);
1262 return infoframes;
1263}
1264EXPORT_SYMBOL_GPL(v4l2_debugfs_if_alloc);
1265
1266void v4l2_debugfs_if_free(struct v4l2_debugfs_if *infoframes)
1267{
1268 if (infoframes) {
1269 debugfs_remove_recursive(dentry: infoframes->if_dir);
1270 kfree(objp: infoframes);
1271 }
1272}
1273EXPORT_SYMBOL_GPL(v4l2_debugfs_if_free);
1274
1275#endif
1276

source code of linux/drivers/media/v4l2-core/v4l2-dv-timings.c