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