drivers/media/v4l2-core/v4l2-dv-timings.c

   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
  20 MODULE_AUTHOR("Hans Verkuil");
  21 MODULE_DESCRIPTION("V4L2 DV Timings Helper Functions");
  22 MODULE_LICENSE("GPL");
  23
  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,
 136         { }
 137 };
 138 EXPORT_SYMBOL_GPL(v4l2_dv_timings_presets);
 139
 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,
 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
 149         if (t->type != V4L2_DV_BT_656_1120)
 150                 return false;
 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)))
 163                 return false;
 164
 165         /* sanity checks for the blanking timings */
 166         if (!bt->interlaced &&
 167             (bt->il_vbackporch || bt->il_vsync || bt->il_vfrontporch))
 168                 return false;
 169         if (bt->hfrontporch > 2 * bt->width ||
 170             bt->hsync > 1024 || bt->hbackporch > 1024)
 171                 return false;
 172         if (bt->vfrontporch > 4096 ||
 173             bt->vsync > 128 || bt->vbackporch > 4096)
 174                 return false;
 175         if (bt->interlaced && (bt->il_vfrontporch > 4096 ||
 176             bt->il_vsync > 128 || bt->il_vbackporch > 4096))
 177                 return false;
 178         return fnc == NULL || fnc(t, fnc_handle);
 179 }
 180 EXPORT_SYMBOL_GPL(v4l2_valid_dv_timings);
 181
 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,
 185                              void *fnc_handle)
 186 {
 187         u32 i, idx;
 188
 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,
 192                                           fnc, fnc_handle) &&
 193                     idx++ == t->index) {
 194                         t->timings = v4l2_dv_timings_presets[i];
 195                         return 0;
 196                 }
 197         }
 198         return -EINVAL;
 199 }
 200 EXPORT_SYMBOL_GPL(v4l2_enum_dv_timings_cap);
 201
 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,
 206                               void *fnc_handle)
 207 {
 208         int i;
 209
 210         if (!v4l2_valid_dv_timings(t, cap, fnc, fnc_handle))
 211                 return false;
 212
 213         for (i = 0; v4l2_dv_timings_presets[i].bt.width; i++) {
 214                 if (v4l2_valid_dv_timings(v4l2_dv_timings_presets + i, cap,
 215                                           fnc, fnc_handle) &&
 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;
 219
 220                         *t = v4l2_dv_timings_presets[i];
 221                         if (can_reduce_fps(&t->bt))
 222                                 t->bt.flags |= flags;
 223
 224                         return true;
 225                 }
 226         }
 227         return false;
 228 }
 229 EXPORT_SYMBOL_GPL(v4l2_find_dv_timings_cap);
 230
 231 bool v4l2_find_dv_timings_cea861_vic(struct v4l2_dv_timings *t, u8 vic)
 232 {
 233         unsigned int i;
 234
 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;
 238
 239                 if ((bt->flags & V4L2_DV_FL_HAS_CEA861_VIC) &&
 240                     bt->cea861_vic == vic) {
 241                         *t = v4l2_dv_timings_presets[i];
 242                         return true;
 243                 }
 244         }
 245         return false;
 246 }
 247 EXPORT_SYMBOL_GPL(v4l2_find_dv_timings_cea861_vic);
 248
 249 /**
 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
 255  *      match.
 256  *
 257  * Compare t1 with t2 with a given margin of error for the pixelclock.
 258  */
 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)
 262 {
 263         if (t1->type != t2->type || t1->type != V4L2_DV_BT_656_1120)
 264                 return false;
 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)))
 284                 return true;
 285         return false;
 286 }
 287 EXPORT_SYMBOL_GPL(v4l2_match_dv_timings);
 288
 289 void v4l2_print_dv_timings(const char *dev_prefix, const char *prefix,
 290                            const struct v4l2_dv_timings *t, bool detailed)
 291 {
 292         const struct v4l2_bt_timings *bt = &t->bt;
 293         u32 htot, vtot;
 294         u32 fps;
 295
 296         if (t->type != V4L2_DV_BT_656_1120)
 297                 return;
 298
 299         htot = V4L2_DV_BT_FRAME_WIDTH(bt);
 300         vtot = V4L2_DV_BT_FRAME_HEIGHT(bt);
 301         if (bt->interlaced)
 302                 vtot /= 2;
 303
 304         fps = (htot * vtot) > 0 ? div_u64((100 * (u64)bt->pixelclock),
 305                                   (htot * vtot)) : 0;
 306
 307         if (prefix == NULL)
 308                 prefix = "";
 309
 310         pr_info("%s: %s%ux%u%s%u.%u (%ux%u)\n", dev_prefix, prefix,
 311                 bt->width, bt->height, bt->interlaced ? "i" : "p",
 312                 fps / 100, fps % 100, htot, vtot);
 313
 314         if (!detailed)
 315                 return;
 316
 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);
 325         if (bt->interlaced)
 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) ?
 340                         " REDUCED_FPS" : "",
 341                         (bt->flags & V4L2_DV_FL_HALF_LINE) ?
 342                         " HALF_LINE" : "",
 343                         (bt->flags & V4L2_DV_FL_IS_CE_VIDEO) ?
 344                         " 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);
 367 }
 368 EXPORT_SYMBOL_GPL(v4l2_print_dv_timings);
 369
 370 struct v4l2_fract v4l2_dv_timings_aspect_ratio(const struct v4l2_dv_timings *t)
 371 {
 372         struct v4l2_fract ratio = { 1, 1 };
 373         unsigned long n, d;
 374
 375         if (t->type != V4L2_DV_BT_656_1120)
 376                 return ratio;
 377         if (!(t->bt.flags & V4L2_DV_FL_HAS_PICTURE_ASPECT))
 378                 return ratio;
 379
 380         ratio.numerator = t->bt.width * t->bt.picture_aspect.denominator;
 381         ratio.denominator = t->bt.height * t->bt.picture_aspect.numerator;
 382
 383         rational_best_approximation(ratio.numerator, ratio.denominator,
 384                                     ratio.numerator, ratio.denominator, &n, &d);
 385         ratio.numerator = n;
 386         ratio.denominator = d;
 387         return ratio;
 388 }
 389 EXPORT_SYMBOL_GPL(v4l2_dv_timings_aspect_ratio);
 390
 391 /*
 392  * CVT defines
 393  * Based on Coordinated Video Timings Standard
 394  * version 1.1 September 10, 2003
 395  */
 396
 397 #define CVT_PXL_CLK_GRAN        250000  /* pixel clock granularity */
 398 #define CVT_PXL_CLK_GRAN_RB_V2 1000     /* granularity for reduced blanking v2*/
 399
 400 /* Normal blanking */
 401 #define CVT_MIN_V_BPORCH        7       /* lines */
 402 #define CVT_MIN_V_PORCH_RND     3       /* lines */
 403 #define CVT_MIN_VSYNC_BP        550     /* min time of vsync + back porch (us) */
 404 #define CVT_HSYNC_PERCENT       8       /* nominal hsync as percentage of line */
 405
 406 /* Normal blanking for CVT uses GTF to calculate horizontal blanking */
 407 #define CVT_CELL_GRAN           8       /* character cell granularity */
 408 #define CVT_M                   600     /* blanking formula gradient */
 409 #define CVT_C                   40      /* blanking formula offset */
 410 #define CVT_K                   128     /* blanking formula scaling factor */
 411 #define CVT_J                   20      /* blanking formula scaling factor */
 412 #define CVT_C_PRIME (((CVT_C - CVT_J) * CVT_K / 256) + CVT_J)
 413 #define CVT_M_PRIME (CVT_K * CVT_M / 256)
 414
 415 /* Reduced Blanking */
 416 #define CVT_RB_MIN_V_BPORCH    7       /* lines  */
 417 #define CVT_RB_V_FPORCH        3       /* lines  */
 418 #define CVT_RB_MIN_V_BLANK   460       /* us     */
 419 #define CVT_RB_H_SYNC         32       /* pixels */
 420 #define CVT_RB_H_BLANK       160       /* pixels */
 421 /* Reduce blanking Version 2 */
 422 #define CVT_RB_V2_H_BLANK     80       /* pixels */
 423 #define CVT_RB_MIN_V_FPORCH    3       /* lines  */
 424 #define CVT_RB_V2_MIN_V_FPORCH 1       /* lines  */
 425 #define CVT_RB_V_BPORCH        6       /* lines  */
 426
 427 /** v4l2_detect_cvt - detect if the given timings follow the CVT standard
 428  * @frame_height - the total height of the frame (including blanking) in lines.
 429  * @hfreq - the horizontal frequency in Hz.
 430  * @vsync - the height of the vertical sync in lines.
 431  * @active_width - active width of image (does not include blanking). This
 432  * information is needed only in case of version 2 of reduced blanking.
 433  * In other cases, this parameter does not have any effect on timings.
 434  * @polarities - the horizontal and vertical polarities (same as struct
 435  *              v4l2_bt_timings polarities).
 436  * @interlaced - if this flag is true, it indicates interlaced format
 437  * @fmt - the resulting timings.
 438  *
 439  * This function will attempt to detect if the given values correspond to a
 440  * valid CVT format. If so, then it will return true, and fmt will be filled
 441  * in with the found CVT timings.
 442  */
 443 bool v4l2_detect_cvt(unsigned frame_height,
 444                      unsigned hfreq,
 445                      unsigned vsync,
 446                      unsigned active_width,
 447                      u32 polarities,
 448                      bool interlaced,
 449                      struct v4l2_dv_timings *fmt)
 450 {
 451         int  v_fp, v_bp, h_fp, h_bp, hsync;
 452         int  frame_width, image_height, image_width;
 453         bool reduced_blanking;
 454         bool rb_v2 = false;
 455         unsigned pix_clk;
 456
 457         if (vsync < 4 || vsync > 8)
 458                 return false;
 459
 460         if (polarities == V4L2_DV_VSYNC_POS_POL)
 461                 reduced_blanking = false;
 462         else if (polarities == V4L2_DV_HSYNC_POS_POL)
 463                 reduced_blanking = true;
 464         else
 465                 return false;
 466
 467         if (reduced_blanking && vsync == 8)
 468                 rb_v2 = true;
 469
 470         if (rb_v2 && active_width == 0)
 471                 return false;
 472
 473         if (!rb_v2 && vsync > 7)
 474                 return false;
 475
 476         if (hfreq == 0)
 477                 return false;
 478
 479         /* Vertical */
 480         if (reduced_blanking) {
 481                 if (rb_v2) {
 482                         v_bp = CVT_RB_V_BPORCH;
 483                         v_fp = (CVT_RB_MIN_V_BLANK * hfreq) / 1000000 + 1;
 484                         v_fp -= vsync + v_bp;
 485
 486                         if (v_fp < CVT_RB_V2_MIN_V_FPORCH)
 487                                 v_fp = CVT_RB_V2_MIN_V_FPORCH;
 488                 } else {
 489                         v_fp = CVT_RB_V_FPORCH;
 490                         v_bp = (CVT_RB_MIN_V_BLANK * hfreq) / 1000000 + 1;
 491                         v_bp -= vsync + v_fp;
 492
 493                         if (v_bp < CVT_RB_MIN_V_BPORCH)
 494                                 v_bp = CVT_RB_MIN_V_BPORCH;
 495                 }
 496         } else {
 497                 v_fp = CVT_MIN_V_PORCH_RND;
 498                 v_bp = (CVT_MIN_VSYNC_BP * hfreq) / 1000000 + 1 - vsync;
 499
 500                 if (v_bp < CVT_MIN_V_BPORCH)
 501                         v_bp = CVT_MIN_V_BPORCH;
 502         }
 503
 504         if (interlaced)
 505                 image_height = (frame_height - 2 * v_fp - 2 * vsync - 2 * v_bp) & ~0x1;
 506         else
 507                 image_height = (frame_height - v_fp - vsync - v_bp + 1) & ~0x1;
 508
 509         if (image_height < 0)
 510                 return false;
 511
 512         /* Aspect ratio based on vsync */
 513         switch (vsync) {
 514         case 4:
 515                 image_width = (image_height * 4) / 3;
 516                 break;
 517         case 5:
 518                 image_width = (image_height * 16) / 9;
 519                 break;
 520         case 6:
 521                 image_width = (image_height * 16) / 10;
 522                 break;
 523         case 7:
 524                 /* special case */
 525                 if (image_height == 1024)
 526                         image_width = (image_height * 5) / 4;
 527                 else if (image_height == 768)
 528                         image_width = (image_height * 15) / 9;
 529                 else
 530                         return false;
 531                 break;
 532         case 8:
 533                 image_width = active_width;
 534                 break;
 535         default:
 536                 return false;
 537         }
 538
 539         if (!rb_v2)
 540                 image_width = image_width & ~7;
 541
 542         /* Horizontal */
 543         if (reduced_blanking) {
 544                 int h_blank;
 545                 int clk_gran;
 546
 547                 h_blank = rb_v2 ? CVT_RB_V2_H_BLANK : CVT_RB_H_BLANK;
 548                 clk_gran = rb_v2 ? CVT_PXL_CLK_GRAN_RB_V2 : CVT_PXL_CLK_GRAN;
 549
 550                 pix_clk = (image_width + h_blank) * hfreq;
 551                 pix_clk = (pix_clk / clk_gran) * clk_gran;
 552
 553                 h_bp  = h_blank / 2;
 554                 hsync = CVT_RB_H_SYNC;
 555                 h_fp  = h_blank - h_bp - hsync;
 556
 557                 frame_width = image_width + h_blank;
 558         } else {
 559                 unsigned ideal_duty_cycle_per_myriad =
 560                         100 * CVT_C_PRIME - (CVT_M_PRIME * 100000) / hfreq;
 561                 int h_blank;
 562
 563                 if (ideal_duty_cycle_per_myriad < 2000)
 564                         ideal_duty_cycle_per_myriad = 2000;
 565
 566                 h_blank = image_width * ideal_duty_cycle_per_myriad /
 567                                         (10000 - ideal_duty_cycle_per_myriad);
 568                 h_blank = (h_blank / (2 * CVT_CELL_GRAN)) * 2 * CVT_CELL_GRAN;
 569
 570                 pix_clk = (image_width + h_blank) * hfreq;
 571                 pix_clk = (pix_clk / CVT_PXL_CLK_GRAN) * CVT_PXL_CLK_GRAN;
 572
 573                 h_bp = h_blank / 2;
 574                 frame_width = image_width + h_blank;
 575
 576                 hsync = frame_width * CVT_HSYNC_PERCENT / 100;
 577                 hsync = (hsync / CVT_CELL_GRAN) * CVT_CELL_GRAN;
 578                 h_fp = h_blank - hsync - h_bp;
 579         }
 580
 581         fmt->type = V4L2_DV_BT_656_1120;
 582         fmt->bt.polarities = polarities;
 583         fmt->bt.width = image_width;
 584         fmt->bt.height = image_height;
 585         fmt->bt.hfrontporch = h_fp;
 586         fmt->bt.vfrontporch = v_fp;
 587         fmt->bt.hsync = hsync;
 588         fmt->bt.vsync = vsync;
 589         fmt->bt.hbackporch = frame_width - image_width - h_fp - hsync;
 590
 591         if (!interlaced) {
 592                 fmt->bt.vbackporch = frame_height - image_height - v_fp - vsync;
 593                 fmt->bt.interlaced = V4L2_DV_PROGRESSIVE;
 594         } else {
 595                 fmt->bt.vbackporch = (frame_height - image_height - 2 * v_fp -
 596                                       2 * vsync) / 2;
 597                 fmt->bt.il_vbackporch = frame_height - image_height - 2 * v_fp -
 598                                         2 * vsync - fmt->bt.vbackporch;
 599                 fmt->bt.il_vfrontporch = v_fp;
 600                 fmt->bt.il_vsync = vsync;
 601                 fmt->bt.flags |= V4L2_DV_FL_HALF_LINE;
 602                 fmt->bt.interlaced = V4L2_DV_INTERLACED;
 603         }
 604
 605         fmt->bt.pixelclock = pix_clk;
 606         fmt->bt.standards = V4L2_DV_BT_STD_CVT;
 607
 608         if (reduced_blanking)
 609                 fmt->bt.flags |= V4L2_DV_FL_REDUCED_BLANKING;
 610
 611         return true;
 612 }
 613 EXPORT_SYMBOL_GPL(v4l2_detect_cvt);
 614
 615 /*
 616  * GTF defines
 617  * Based on Generalized Timing Formula Standard
 618  * Version 1.1 September 2, 1999
 619  */
 620
 621 #define GTF_PXL_CLK_GRAN        250000  /* pixel clock granularity */
 622
 623 #define GTF_MIN_VSYNC_BP        550     /* min time of vsync + back porch (us) */
 624 #define GTF_V_FP                1       /* vertical front porch (lines) */
 625 #define GTF_CELL_GRAN           8       /* character cell granularity */
 626
 627 /* Default */
 628 #define GTF_D_M                 600     /* blanking formula gradient */
 629 #define GTF_D_C                 40      /* blanking formula offset */
 630 #define GTF_D_K                 128     /* blanking formula scaling factor */
 631 #define GTF_D_J                 20      /* blanking formula scaling factor */
 632 #define GTF_D_C_PRIME ((((GTF_D_C - GTF_D_J) * GTF_D_K) / 256) + GTF_D_J)
 633 #define GTF_D_M_PRIME ((GTF_D_K * GTF_D_M) / 256)
 634
 635 /* Secondary */
 636 #define GTF_S_M                 3600    /* blanking formula gradient */
 637 #define GTF_S_C                 40      /* blanking formula offset */
 638 #define GTF_S_K                 128     /* blanking formula scaling factor */
 639 #define GTF_S_J                 35      /* blanking formula scaling factor */
 640 #define GTF_S_C_PRIME ((((GTF_S_C - GTF_S_J) * GTF_S_K) / 256) + GTF_S_J)
 641 #define GTF_S_M_PRIME ((GTF_S_K * GTF_S_M) / 256)
 642
 643 /** v4l2_detect_gtf - detect if the given timings follow the GTF standard
 644  * @frame_height - the total height of the frame (including blanking) in lines.
 645  * @hfreq - the horizontal frequency in Hz.
 646  * @vsync - the height of the vertical sync in lines.
 647  * @polarities - the horizontal and vertical polarities (same as struct
 648  *              v4l2_bt_timings polarities).
 649  * @interlaced - if this flag is true, it indicates interlaced format
 650  * @aspect - preferred aspect ratio. GTF has no method of determining the
 651  *              aspect ratio in order to derive the image width from the
 652  *              image height, so it has to be passed explicitly. Usually
 653  *              the native screen aspect ratio is used for this. If it
 654  *              is not filled in correctly, then 16:9 will be assumed.
 655  * @fmt - the resulting timings.
 656  *
 657  * This function will attempt to detect if the given values correspond to a
 658  * valid GTF format. If so, then it will return true, and fmt will be filled
 659  * in with the found GTF timings.
 660  */
 661 bool v4l2_detect_gtf(unsigned frame_height,
 662                 unsigned hfreq,
 663                 unsigned vsync,
 664                 u32 polarities,
 665                 bool interlaced,
 666                 struct v4l2_fract aspect,
 667                 struct v4l2_dv_timings *fmt)
 668 {
 669         int pix_clk;
 670         int  v_fp, v_bp, h_fp, hsync;
 671         int frame_width, image_height, image_width;
 672         bool default_gtf;
 673         int h_blank;
 674
 675         if (vsync != 3)
 676                 return false;
 677
 678         if (polarities == V4L2_DV_VSYNC_POS_POL)
 679                 default_gtf = true;
 680         else if (polarities == V4L2_DV_HSYNC_POS_POL)
 681                 default_gtf = false;
 682         else
 683                 return false;
 684
 685         if (hfreq == 0)
 686                 return false;
 687
 688         /* Vertical */
 689         v_fp = GTF_V_FP;
 690         v_bp = (GTF_MIN_VSYNC_BP * hfreq + 500000) / 1000000 - vsync;
 691         if (interlaced)
 692                 image_height = (frame_height - 2 * v_fp - 2 * vsync - 2 * v_bp) & ~0x1;
 693         else
 694                 image_height = (frame_height - v_fp - vsync - v_bp + 1) & ~0x1;
 695
 696         if (image_height < 0)
 697                 return false;
 698
 699         if (aspect.numerator == 0 || aspect.denominator == 0) {
 700                 aspect.numerator = 16;
 701                 aspect.denominator = 9;
 702         }
 703         image_width = ((image_height * aspect.numerator) / aspect.denominator);
 704         image_width = (image_width + GTF_CELL_GRAN/2) & ~(GTF_CELL_GRAN - 1);
 705
 706         /* Horizontal */
 707         if (default_gtf) {
 708                 u64 num;
 709                 u32 den;
 710
 711                 num = ((image_width * GTF_D_C_PRIME * (u64)hfreq) -
 712                       ((u64)image_width * GTF_D_M_PRIME * 1000));
 713                 den = (hfreq * (100 - GTF_D_C_PRIME) + GTF_D_M_PRIME * 1000) *
 714                       (2 * GTF_CELL_GRAN);
 715                 h_blank = div_u64((num + (den >> 1)), den);
 716                 h_blank *= (2 * GTF_CELL_GRAN);
 717         } else {
 718                 u64 num;
 719                 u32 den;
 720
 721                 num = ((image_width * GTF_S_C_PRIME * (u64)hfreq) -
 722                       ((u64)image_width * GTF_S_M_PRIME * 1000));
 723                 den = (hfreq * (100 - GTF_S_C_PRIME) + GTF_S_M_PRIME * 1000) *
 724                       (2 * GTF_CELL_GRAN);
 725                 h_blank = div_u64((num + (den >> 1)), den);
 726                 h_blank *= (2 * GTF_CELL_GRAN);
 727         }
 728
 729         frame_width = image_width + h_blank;
 730
 731         pix_clk = (image_width + h_blank) * hfreq;
 732         pix_clk = pix_clk / GTF_PXL_CLK_GRAN * GTF_PXL_CLK_GRAN;
 733
 734         hsync = (frame_width * 8 + 50) / 100;
 735         hsync = ((hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN) * GTF_CELL_GRAN;
 736
 737         h_fp = h_blank / 2 - hsync;
 738
 739         fmt->type = V4L2_DV_BT_656_1120;
 740         fmt->bt.polarities = polarities;
 741         fmt->bt.width = image_width;
 742         fmt->bt.height = image_height;
 743         fmt->bt.hfrontporch = h_fp;
 744         fmt->bt.vfrontporch = v_fp;
 745         fmt->bt.hsync = hsync;
 746         fmt->bt.vsync = vsync;
 747         fmt->bt.hbackporch = frame_width - image_width - h_fp - hsync;
 748
 749         if (!interlaced) {
 750                 fmt->bt.vbackporch = frame_height - image_height - v_fp - vsync;
 751                 fmt->bt.interlaced = V4L2_DV_PROGRESSIVE;
 752         } else {
 753                 fmt->bt.vbackporch = (frame_height - image_height - 2 * v_fp -
 754                                       2 * vsync) / 2;
 755                 fmt->bt.il_vbackporch = frame_height - image_height - 2 * v_fp -
 756                                         2 * vsync - fmt->bt.vbackporch;
 757                 fmt->bt.il_vfrontporch = v_fp;
 758                 fmt->bt.il_vsync = vsync;
 759                 fmt->bt.flags |= V4L2_DV_FL_HALF_LINE;
 760                 fmt->bt.interlaced = V4L2_DV_INTERLACED;
 761         }
 762
 763         fmt->bt.pixelclock = pix_clk;
 764         fmt->bt.standards = V4L2_DV_BT_STD_GTF;
 765
 766         if (!default_gtf)
 767                 fmt->bt.flags |= V4L2_DV_FL_REDUCED_BLANKING;
 768
 769         return true;
 770 }
 771 EXPORT_SYMBOL_GPL(v4l2_detect_gtf);
 772
 773 /** v4l2_calc_aspect_ratio - calculate the aspect ratio based on bytes
 774  *      0x15 and 0x16 from the EDID.
 775  * @hor_landscape - byte 0x15 from the EDID.
 776  * @vert_portrait - byte 0x16 from the EDID.
 777  *
 778  * Determines the aspect ratio from the EDID.
 779  * See VESA Enhanced EDID standard, release A, rev 2, section 3.6.2:
 780  * "Horizontal and Vertical Screen Size or Aspect Ratio"
 781  */
 782 struct v4l2_fract v4l2_calc_aspect_ratio(u8 hor_landscape, u8 vert_portrait)
 783 {
 784         struct v4l2_fract aspect = { 16, 9 };
 785         u8 ratio;
 786
 787         /* Nothing filled in, fallback to 16:9 */
 788         if (!hor_landscape && !vert_portrait)
 789                 return aspect;
 790         /* Both filled in, so they are interpreted as the screen size in cm */
 791         if (hor_landscape && vert_portrait) {
 792                 aspect.numerator = hor_landscape;
 793                 aspect.denominator = vert_portrait;
 794                 return aspect;
 795         }
 796         /* Only one is filled in, so interpret them as a ratio:
 797            (val + 99) / 100 */
 798         ratio = hor_landscape | vert_portrait;
 799         /* Change some rounded values into the exact aspect ratio */
 800         if (ratio == 79) {
 801                 aspect.numerator = 16;
 802                 aspect.denominator = 9;
 803         } else if (ratio == 34) {
 804                 aspect.numerator = 4;
 805                 aspect.denominator = 3;
 806         } else if (ratio == 68) {
 807                 aspect.numerator = 15;
 808                 aspect.denominator = 9;
 809         } else {
 810                 aspect.numerator = hor_landscape + 99;
 811                 aspect.denominator = 100;
 812         }
 813         if (hor_landscape)
 814                 return aspect;
 815         /* The aspect ratio is for portrait, so swap numerator and denominator */
 816         swap(aspect.denominator, aspect.numerator);
 817         return aspect;
 818 }
 819 EXPORT_SYMBOL_GPL(v4l2_calc_aspect_ratio);
 820
 821 /** v4l2_hdmi_rx_colorimetry - determine HDMI colorimetry information
 822  *      based on various InfoFrames.
 823  * @avi: the AVI InfoFrame
 824  * @hdmi: the HDMI Vendor InfoFrame, may be NULL
 825  * @height: the frame height
 826  *
 827  * Determines the HDMI colorimetry information, i.e. how the HDMI
 828  * pixel color data should be interpreted.
 829  *
 830  * Note that some of the newer features (DCI-P3, HDR) are not yet
 831  * implemented: the hdmi.h header needs to be updated to the HDMI 2.0
 832  * and CTA-861-G standards.
 833  */
 834 struct v4l2_hdmi_colorimetry
 835 v4l2_hdmi_rx_colorimetry(const struct hdmi_avi_infoframe *avi,
 836                          const struct hdmi_vendor_infoframe *hdmi,
 837                          unsigned int height)
 838 {
 839         struct v4l2_hdmi_colorimetry c = {
 840                 V4L2_COLORSPACE_SRGB,
 841                 V4L2_YCBCR_ENC_DEFAULT,
 842                 V4L2_QUANTIZATION_FULL_RANGE,
 843                 V4L2_XFER_FUNC_SRGB
 844         };
 845         bool is_ce = avi->video_code || (hdmi && hdmi->vic);
 846         bool is_sdtv = height <= 576;
 847         bool default_is_lim_range_rgb = avi->video_code > 1;
 848
 849         switch (avi->colorspace) {
 850         case HDMI_COLORSPACE_RGB:
 851                 /* RGB pixel encoding */
 852                 switch (avi->colorimetry) {
 853                 case HDMI_COLORIMETRY_EXTENDED:
 854                         switch (avi->extended_colorimetry) {
 855                         case HDMI_EXTENDED_COLORIMETRY_OPRGB:
 856                                 c.colorspace = V4L2_COLORSPACE_OPRGB;
 857                                 c.xfer_func = V4L2_XFER_FUNC_OPRGB;
 858                                 break;
 859                         case HDMI_EXTENDED_COLORIMETRY_BT2020:
 860                                 c.colorspace = V4L2_COLORSPACE_BT2020;
 861                                 c.xfer_func = V4L2_XFER_FUNC_709;
 862                                 break;
 863                         default:
 864                                 break;
 865                         }
 866                         break;
 867                 default:
 868                         break;
 869                 }
 870                 switch (avi->quantization_range) {
 871                 case HDMI_QUANTIZATION_RANGE_LIMITED:
 872                         c.quantization = V4L2_QUANTIZATION_LIM_RANGE;
 873                         break;
 874                 case HDMI_QUANTIZATION_RANGE_FULL:
 875                         break;
 876                 default:
 877                         if (default_is_lim_range_rgb)
 878                                 c.quantization = V4L2_QUANTIZATION_LIM_RANGE;
 879                         break;
 880                 }
 881                 break;
 882
 883         default:
 884                 /* YCbCr pixel encoding */
 885                 c.quantization = V4L2_QUANTIZATION_LIM_RANGE;
 886                 switch (avi->colorimetry) {
 887                 case HDMI_COLORIMETRY_NONE:
 888                         if (!is_ce)
 889                                 break;
 890                         if (is_sdtv) {
 891                                 c.colorspace = V4L2_COLORSPACE_SMPTE170M;
 892                                 c.ycbcr_enc = V4L2_YCBCR_ENC_601;
 893                         } else {
 894                                 c.colorspace = V4L2_COLORSPACE_REC709;
 895                                 c.ycbcr_enc = V4L2_YCBCR_ENC_709;
 896                         }
 897                         c.xfer_func = V4L2_XFER_FUNC_709;
 898                         break;
 899                 case HDMI_COLORIMETRY_ITU_601:
 900                         c.colorspace = V4L2_COLORSPACE_SMPTE170M;
 901                         c.ycbcr_enc = V4L2_YCBCR_ENC_601;
 902                         c.xfer_func = V4L2_XFER_FUNC_709;
 903                         break;
 904                 case HDMI_COLORIMETRY_ITU_709:
 905                         c.colorspace = V4L2_COLORSPACE_REC709;
 906                         c.ycbcr_enc = V4L2_YCBCR_ENC_709;
 907                         c.xfer_func = V4L2_XFER_FUNC_709;
 908                         break;
 909                 case HDMI_COLORIMETRY_EXTENDED:
 910                         switch (avi->extended_colorimetry) {
 911                         case HDMI_EXTENDED_COLORIMETRY_XV_YCC_601:
 912                                 c.colorspace = V4L2_COLORSPACE_REC709;
 913                                 c.ycbcr_enc = V4L2_YCBCR_ENC_XV709;
 914                                 c.xfer_func = V4L2_XFER_FUNC_709;
 915                                 break;
 916                         case HDMI_EXTENDED_COLORIMETRY_XV_YCC_709:
 917                                 c.colorspace = V4L2_COLORSPACE_REC709;
 918                                 c.ycbcr_enc = V4L2_YCBCR_ENC_XV601;
 919                                 c.xfer_func = V4L2_XFER_FUNC_709;
 920                                 break;
 921                         case HDMI_EXTENDED_COLORIMETRY_S_YCC_601:
 922                                 c.colorspace = V4L2_COLORSPACE_SRGB;
 923                                 c.ycbcr_enc = V4L2_YCBCR_ENC_601;
 924                                 c.xfer_func = V4L2_XFER_FUNC_SRGB;
 925                                 break;
 926                         case HDMI_EXTENDED_COLORIMETRY_OPYCC_601:
 927                                 c.colorspace = V4L2_COLORSPACE_OPRGB;
 928                                 c.ycbcr_enc = V4L2_YCBCR_ENC_601;
 929                                 c.xfer_func = V4L2_XFER_FUNC_OPRGB;
 930                                 break;
 931                         case HDMI_EXTENDED_COLORIMETRY_BT2020:
 932                                 c.colorspace = V4L2_COLORSPACE_BT2020;
 933                                 c.ycbcr_enc = V4L2_YCBCR_ENC_BT2020;
 934                                 c.xfer_func = V4L2_XFER_FUNC_709;
 935                                 break;
 936                         case HDMI_EXTENDED_COLORIMETRY_BT2020_CONST_LUM:
 937                                 c.colorspace = V4L2_COLORSPACE_BT2020;
 938                                 c.ycbcr_enc = V4L2_YCBCR_ENC_BT2020_CONST_LUM;
 939                                 c.xfer_func = V4L2_XFER_FUNC_709;
 940                                 break;
 941                         default: /* fall back to ITU_709 */
 942                                 c.colorspace = V4L2_COLORSPACE_REC709;
 943                                 c.ycbcr_enc = V4L2_YCBCR_ENC_709;
 944                                 c.xfer_func = V4L2_XFER_FUNC_709;
 945                                 break;
 946                         }
 947                         break;
 948                 default:
 949                         break;
 950                 }
 951                 /*
 952                  * YCC Quantization Range signaling is more-or-less broken,
 953                  * let's just ignore this.
 954                  */
 955                 break;
 956         }
 957         return c;
 958 }
 959 EXPORT_SYMBOL_GPL(v4l2_hdmi_rx_colorimetry);
 960
 961 /**
 962  * v4l2_get_edid_phys_addr() - find and return the physical address
 963  *
 964  * @edid:       pointer to the EDID data
 965  * @size:       size in bytes of the EDID data
 966  * @offset:     If not %NULL then the location of the physical address
 967  *              bytes in the EDID will be returned here. This is set to 0
 968  *              if there is no physical address found.
 969  *
 970  * Return: the physical address or CEC_PHYS_ADDR_INVALID if there is none.
 971  */
 972 u16 v4l2_get_edid_phys_addr(const u8 *edid, unsigned int size,
 973                             unsigned int *offset)
 974 {
 975         unsigned int loc = cec_get_edid_spa_location(edid, size);
 976
 977         if (offset)
 978                 *offset = loc;
 979         if (loc == 0)
 980                 return CEC_PHYS_ADDR_INVALID;
 981         return (edid[loc] << 8) | edid[loc + 1];
 982 }
 983 EXPORT_SYMBOL_GPL(v4l2_get_edid_phys_addr);
 984
 985 /**
 986  * v4l2_set_edid_phys_addr() - find and set the physical address
 987  *
 988  * @edid:       pointer to the EDID data
 989  * @size:       size in bytes of the EDID data
 990  * @phys_addr:  the new physical address
 991  *
 992  * This function finds the location of the physical address in the EDID
 993  * and fills in the given physical address and updates the checksum
 994  * at the end of the EDID block. It does nothing if the EDID doesn't
 995  * contain a physical address.
 996  */
 997 void v4l2_set_edid_phys_addr(u8 *edid, unsigned int size, u16 phys_addr)
 998 {
 999         unsigned int loc = cec_get_edid_spa_location(edid, size);
1000         u8 sum = 0;
1001         unsigned int i;
1002
1003         if (loc == 0)
1004                 return;
1005         edid[loc] = phys_addr >> 8;
1006         edid[loc + 1] = phys_addr & 0xff;
1007         loc &= ~0x7f;
1008
1009         /* update the checksum */
1010         for (i = loc; i < loc + 127; i++)
1011                 sum += edid[i];
1012         edid[i] = 256 - sum;
1013 }
1014 EXPORT_SYMBOL_GPL(v4l2_set_edid_phys_addr);
1015
1016 /**
1017  * v4l2_phys_addr_for_input() - calculate the PA for an input
1018  *
1019  * @phys_addr:  the physical address of the parent
1020  * @input:      the number of the input port, must be between 1 and 15
1021  *
1022  * This function calculates a new physical address based on the input
1023  * port number. For example:
1024  *
1025  * PA = 0.0.0.0 and input = 2 becomes 2.0.0.0
1026  *
1027  * PA = 3.0.0.0 and input = 1 becomes 3.1.0.0
1028  *
1029  * PA = 3.2.1.0 and input = 5 becomes 3.2.1.5
1030  *
1031  * PA = 3.2.1.3 and input = 5 becomes f.f.f.f since it maxed out the depth.
1032  *
1033  * Return: the new physical address or CEC_PHYS_ADDR_INVALID.
1034  */
1035 u16 v4l2_phys_addr_for_input(u16 phys_addr, u8 input)
1036 {
1037         /* Check if input is sane */
1038         if (WARN_ON(input == 0 || input > 0xf))
1039                 return CEC_PHYS_ADDR_INVALID;
1040
1041         if (phys_addr == 0)
1042                 return input << 12;
1043
1044         if ((phys_addr & 0x0fff) == 0)
1045                 return phys_addr | (input << 8);
1046
1047         if ((phys_addr & 0x00ff) == 0)
1048                 return phys_addr | (input << 4);
1049
1050         if ((phys_addr & 0x000f) == 0)
1051                 return phys_addr | input;
1052
1053         /*
1054          * All nibbles are used so no valid physical addresses can be assigned
1055          * to the input.
1056          */
1057         return CEC_PHYS_ADDR_INVALID;
1058 }
1059 EXPORT_SYMBOL_GPL(v4l2_phys_addr_for_input);
1060
1061 /**
1062  * v4l2_phys_addr_validate() - validate a physical address from an EDID
1063  *
1064  * @phys_addr:  the physical address to validate
1065  * @parent:     if not %NULL, then this is filled with the parents PA.
1066  * @port:       if not %NULL, then this is filled with the input port.
1067  *
1068  * This validates a physical address as read from an EDID. If the
1069  * PA is invalid (such as 1.0.1.0 since '0' is only allowed at the end),
1070  * then it will return -EINVAL.
1071  *
1072  * The parent PA is passed into %parent and the input port is passed into
1073  * %port. For example:
1074  *
1075  * PA = 0.0.0.0: has parent 0.0.0.0 and input port 0.
1076  *
1077  * PA = 1.0.0.0: has parent 0.0.0.0 and input port 1.
1078  *
1079  * PA = 3.2.0.0: has parent 3.0.0.0 and input port 2.
1080  *
1081  * PA = f.f.f.f: has parent f.f.f.f and input port 0.
1082  *
1083  * Return: 0 if the PA is valid, -EINVAL if not.
1084  */
1085 int v4l2_phys_addr_validate(u16 phys_addr, u16 *parent, u16 *port)
1086 {
1087         int i;
1088
1089         if (parent)
1090                 *parent = phys_addr;
1091         if (port)
1092                 *port = 0;
1093         if (phys_addr == CEC_PHYS_ADDR_INVALID)
1094                 return 0;
1095         for (i = 0; i < 16; i += 4)
1096                 if (phys_addr & (0xf << i))
1097                         break;
1098         if (i == 16)
1099                 return 0;
1100         if (parent)
1101                 *parent = phys_addr & (0xfff0 << i);
1102         if (port)
1103                 *port = (phys_addr >> i) & 0xf;
1104         for (i += 4; i < 16; i += 4)
1105                 if ((phys_addr & (0xf << i)) == 0)
1106                         return -EINVAL;
1107         return 0;
1108 }
1109 EXPORT_SYMBOL_GPL(v4l2_phys_addr_validate);