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edid-decode.c
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edid-decode.c
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/*
* Copyright 2006-2012 Red Hat, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* on the rights to use, copy, modify, merge, publish, distribute, sub
* license, and/or sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/* Author: Adam Jackson <[email protected]> */
/* Maintainer: Hans Verkuil <[email protected]> */
/* Other changes by Stefano Ceccherini */
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <getopt.h>
#include <stdio.h>
#include <stdint.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>
#include <ctype.h>
#include <math.h>
#include "EDID.h"
#define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
#define min(a, b) ((a) < (b) ? (a) : (b))
#define max(a, b) ((a) > (b) ? (a) : (b))
enum {
EDID_PAGE_SIZE = 128u
};
static int edid_minor = 0;
static int claims_one_point_oh = 0;
static int claims_one_point_two = 0;
static int claims_one_point_three = 0;
static int claims_one_point_four = 0;
static int nonconformant_digital_display = 0;
static int nonconformant_extension = 0;
static int did_detailed_timing = 0;
static int has_name_descriptor = 0;
static int has_serial_string = 0;
static int has_ascii_string = 0;
static int has_range_descriptor = 0;
static int has_preferred_timing = 0;
static int has_valid_checksum = 1;
static int has_valid_cta_checksum = 1;
static int has_valid_displayid_checksum = 1;
static int has_valid_cvt = 1;
static int has_valid_dummy_block = 1;
static int has_valid_serial_number = 0;
static int has_valid_serial_string = 0;
static int has_valid_name_descriptor = 0;
static int has_valid_week = 0;
static int has_valid_year = 0;
static int has_valid_detailed_blocks = 0;
static int has_valid_descriptor_ordering = 1;
static int has_valid_descriptor_pad = 1;
static int has_valid_range_descriptor = 1;
static int has_valid_max_dotclock = 1;
static int has_valid_string_termination = 1;
static int empty_string = 0;
static int trailing_space = 0;
static int has_cta861 = 0;
static int has_640x480p60_est_timing = 0;
static int has_cta861_vic_1 = 0;
static int manufacturer_name_well_formed = 0;
static int seen_non_detailed_descriptor = 0;
static int warning_excessive_dotclock_correction = 0;
static int nonconformant_hf_vsdb_position = 0;
static int nonconformant_srgb_chromaticity = 0;
static int nonconformant_cta861_640x480 = 0;
static int nonconformant_hdmi_vsdb_tmds_rate = 0;
static int min_hor_freq_hz = 0xfffffff;
static int max_hor_freq_hz = 0;
static int min_vert_freq_hz = 0xfffffff;
static int max_vert_freq_hz = 0;
static int max_pixclk_khz = 0;
static int mon_min_hor_freq_hz = 0;
static int mon_max_hor_freq_hz = 0;
static int mon_min_vert_freq_hz = 0;
static int mon_max_vert_freq_hz = 0;
static int mon_max_pixclk_khz = 0;
static unsigned supported_hdmi_vic_codes = 0;
static char serial_string[26];
static char model_string[13];
enum output_format {
OUT_FMT_DEFAULT,
OUT_FMT_HEX,
OUT_FMT_RAW,
OUT_FMT_CARRAY
};
struct value {
int value;
const char *description;
};
struct field {
const char *name;
int start, end;
struct value *values;
int n_values;
};
#define DEFINE_FIELD(n, var, s, e, ...) \
static struct value var##_values[] = { \
__VA_ARGS__ \
}; \
static struct field var = { \
.name = n, \
.start = s, \
.end = e, \
.values = var##_values, \
.n_values = ARRAY_SIZE(var##_values), \
}
static void decode_value(struct field *field, int val, const char *prefix)
{
struct value *v;
int i;
for (i = 0; i < field->n_values; i++) {
v = &field->values[i];
if (v->value == val)
break;
}
if (i == field->n_values) {
return;
}
}
static void _decode(struct field **fields, int n_fields, int data, const char *prefix)
{
int i;
for (i = 0; i < n_fields; i++) {
struct field *f = fields[i];
int field_length = f->end - f->start + 1;
int val;
if (field_length == 32)
val = data;
else
val = (data >> f->start) & ((1 << field_length) - 1);
decode_value(f, val, prefix);
}
}
#define decode(fields, data, prefix) \
_decode(fields, ARRAY_SIZE(fields), data, prefix)
static char *manufacturer_name(const unsigned char *x)
{
static char name[4];
name[0] = ((x[0] & 0x7C) >> 2) + '@';
name[1] = ((x[0] & 0x03) << 3) + ((x[1] & 0xE0) >> 5) + '@';
name[2] = (x[1] & 0x1F) + '@';
name[3] = 0;
if (isupper(name[0]) && isupper(name[1]) && isupper(name[2]))
manufacturer_name_well_formed = 1;
return name;
}
/*
* Copied from xserver/hw/xfree86/modes/xf86cvt.c
*/
static void edid_cvt_mode(int HDisplay, int VDisplay,
int VRefresh, int Reduced,
unsigned *MinHFreq, unsigned *MaxHFreq,
unsigned *MaxClock)
{
/* 1) top/bottom margin size (% of height) - default: 1.8 */
#define CVT_MARGIN_PERCENTAGE 1.8
/* 2) character cell horizontal granularity (pixels) - default 8 */
#define CVT_H_GRANULARITY 8
/* 4) Minimum vertical porch (lines) - default 3 */
#define CVT_MIN_V_PORCH 3
/* 4) Minimum number of vertical back porch lines - default 6 */
#define CVT_MIN_V_BPORCH 6
/* Pixel Clock step (kHz) */
#define CVT_CLOCK_STEP 250
float HPeriod;
unsigned HTotal, Clock, HorFreq;
int VSync;
/* 2. Horizontal pixels */
HDisplay = HDisplay - (HDisplay % CVT_H_GRANULARITY);
/* Determine VSync Width from aspect ratio */
if (!(VDisplay % 3) && ((VDisplay * 4 / 3) == HDisplay))
VSync = 4;
else if (!(VDisplay % 9) && ((VDisplay * 16 / 9) == HDisplay))
VSync = 5;
else if (!(VDisplay % 10) && ((VDisplay * 16 / 10) == HDisplay))
VSync = 6;
else if (!(VDisplay % 4) && ((VDisplay * 5 / 4) == HDisplay))
VSync = 7;
else if (!(VDisplay % 9) && ((VDisplay * 15 / 9) == HDisplay))
VSync = 7;
else /* Custom */
VSync = 10;
if (!Reduced) { /* simplified GTF calculation */
/* 4) Minimum time of vertical sync + back porch interval (µs)
* default 550.0 */
#define CVT_MIN_VSYNC_BP 550.0
/* 3) Nominal HSync width (% of line period) - default 8 */
#define CVT_HSYNC_PERCENTAGE 8
float HBlankPercentage;
int HBlank;
/* 8. Estimated Horizontal period */
HPeriod = ((float) (1000000.0 / VRefresh - CVT_MIN_VSYNC_BP)) /
(VDisplay + CVT_MIN_V_PORCH);
/* 5) Definition of Horizontal blanking time limitation */
/* Gradient (%/kHz) - default 600 */
#define CVT_M_FACTOR 600
/* Offset (%) - default 40 */
#define CVT_C_FACTOR 40
/* Blanking time scaling factor - default 128 */
#define CVT_K_FACTOR 128
/* Scaling factor weighting - default 20 */
#define CVT_J_FACTOR 20
#define CVT_M_PRIME (CVT_M_FACTOR * CVT_K_FACTOR / 256)
#define CVT_C_PRIME ((CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + CVT_J_FACTOR)
/* 12. Find ideal blanking duty cycle from formula */
HBlankPercentage = CVT_C_PRIME - CVT_M_PRIME * HPeriod / 1000.0;
/* 13. Blanking time */
if (HBlankPercentage < 20)
HBlankPercentage = 20;
HBlank = HDisplay * HBlankPercentage / (100.0 - HBlankPercentage);
HBlank -= HBlank % (2 * CVT_H_GRANULARITY);
/* 14. Find total number of pixels in a line. */
HTotal = HDisplay + HBlank;
}
else { /* Reduced blanking */
/* Minimum vertical blanking interval time (µs) - default 460 */
#define CVT_RB_MIN_VBLANK 460.0
/* Fixed number of clocks for horizontal sync */
#define CVT_RB_H_SYNC 32.0
/* Fixed number of clocks for horizontal blanking */
#define CVT_RB_H_BLANK 160.0
/* Fixed number of lines for vertical front porch - default 3 */
#define CVT_RB_VFPORCH 3
int VBILines;
/* 8. Estimate Horizontal period. */
HPeriod = ((float) (1000000.0 / VRefresh - CVT_RB_MIN_VBLANK)) / VDisplay;
/* 9. Find number of lines in vertical blanking */
VBILines = ((float) CVT_RB_MIN_VBLANK) / HPeriod + 1;
/* 10. Check if vertical blanking is sufficient */
if (VBILines < (CVT_RB_VFPORCH + VSync + CVT_MIN_V_BPORCH))
VBILines = CVT_RB_VFPORCH + VSync + CVT_MIN_V_BPORCH;
/* 12. Find total number of pixels in a line */
HTotal = HDisplay + CVT_RB_H_BLANK;
}
/* 15/13. Find pixel clock frequency (kHz for xf86) */
Clock = HTotal * 1000.0 / HPeriod;
Clock -= Clock % CVT_CLOCK_STEP;
HorFreq = (Clock * 1000) / HTotal;
*MinHFreq = min(*MinHFreq, HorFreq);
*MaxHFreq = max(*MaxHFreq, HorFreq);
*MaxClock = max(*MaxClock, Clock);
min_hor_freq_hz = min(min_hor_freq_hz, HorFreq);
max_hor_freq_hz = max(max_hor_freq_hz, HorFreq);
max_pixclk_khz = max(max_pixclk_khz, Clock);
}
static int detailed_cvt_descriptor(const unsigned char *x, int first)
{
const unsigned char empty[3] = { 0, 0, 0 };
int width, height;
int valid = 1;
int fifty = 0, sixty = 0, seventyfive = 0, eightyfive = 0, reduced = 0;
int min_refresh = 0xfffffff, max_refresh = 0;
char* ratio = "";
if (!first && !memcmp(x, empty, 3))
return valid;
height = x[0];
height |= (x[1] & 0xf0) << 4;
height++;
height *= 2;
switch (x[1] & 0x0c) {
case 0x00:
width = 8 * (((height * 4) / 3) / 8);
ratio = "4:3";
break;
case 0x04:
width = 8 * (((height * 16) / 9) / 8);
ratio = "16:9";
break;
case 0x08:
width = 8 * (((height * 16) / 10) / 8);
ratio = "16:10";
break;
case 0x0c:
width = 8 * (((height * 15) / 9) / 8);
ratio = "15:9";
break;
}
if (x[1] & 0x03)
valid = 0;
if (x[2] & 0x80)
valid = 0;
if (!(x[2] & 0x1f))
valid = 0;
fifty = (x[2] & 0x10);
sixty = (x[2] & 0x08);
seventyfive = (x[2] & 0x04);
eightyfive = (x[2] & 0x02);
reduced = (x[2] & 0x01);
min_refresh = (fifty ? 50 : (sixty ? 60 : (seventyfive ? 75 : (eightyfive ? 85 : min_refresh))));
max_refresh = (eightyfive ? 85 : (seventyfive ? 75 : (sixty ? 60 : (fifty ? 50 : max_refresh))));
if (valid) {
unsigned min_hfreq = ~0;
unsigned max_hfreq = 0;
unsigned max_clock = 0;
min_vert_freq_hz = min(min_vert_freq_hz, min_refresh);
max_vert_freq_hz = max(max_vert_freq_hz, max_refresh);
if (fifty)
edid_cvt_mode(width, height, 50, 0,
&min_hfreq, &max_hfreq, &max_clock);
if (sixty)
edid_cvt_mode(width, height, 60, 0,
&min_hfreq, &max_hfreq, &max_clock);
if (seventyfive)
edid_cvt_mode(width, height, 75, 0,
&min_hfreq, &max_hfreq, &max_clock);
if (eightyfive)
edid_cvt_mode(width, height, 75, 0,
&min_hfreq, &max_hfreq, &max_clock);
if (reduced)
edid_cvt_mode(width, height, 60, 1,
&min_hfreq, &max_hfreq, &max_clock);
}
(void)ratio;
return valid;
}
/* extract a string from a detailed subblock, checking for termination */
static char *extract_string(const unsigned char *x, int *valid, int len)
{
static char ret[EDID_PAGE_SIZE];
int i, seen_newline = 0;
memset(ret, 0, sizeof(ret));
*valid = 1;
for (i = 0; i < len; i++) {
if (isgraph(x[i])) {
ret[i] = x[i];
} else if (!seen_newline) {
if (x[i] == 0x0a) {
seen_newline = 1;
if (!i) {
empty_string = 1;
*valid = 0;
} else if (ret[i - 1] == 0x20) {
trailing_space = 1;
*valid = 0;
}
} else if (x[i] == 0x20) {
ret[i] = x[i];
} else {
has_valid_string_termination = 0;
*valid = 0;
return ret;
}
} else if (x[i] != 0x20) {
has_valid_string_termination = 0;
*valid = 0;
return ret;
}
}
/* Does the string end with a space? */
if (!seen_newline && ret[len - 1] == 0x20) {
trailing_space = 1;
*valid = 0;
}
return ret;
}
static const struct {
int x, y, refresh, ratio_w, ratio_h;
int hor_freq_hz, pixclk_khz, interlaced;
} established_timings[] = {
/* 0x23 bit 7 - 0 */
{720, 400, 70, 9, 5, 31469, 28320},
{720, 400, 88, 9, 5, 39500, 35500},
{640, 480, 60, 4, 3, 31469, 25175},
{640, 480, 67, 4, 3, 35000, 30240},
{640, 480, 72, 4, 3, 37900, 31500},
{640, 480, 75, 4, 3, 37500, 31500},
{800, 600, 56, 4, 3, 35200, 36000},
{800, 600, 60, 4, 3, 37900, 40000},
/* 0x24 bit 7 - 0 */
{800, 600, 72, 4, 3, 48100, 50000},
{800, 600, 75, 4, 3, 46900, 49500},
{832, 624, 75, 4, 3, 49726, 57284},
{1280, 768, 87, 5, 3, 35522, 44900, 1},
{1024, 768, 60, 4, 3, 48400, 65000},
{1024, 768, 70, 4, 3, 56500, 75000},
{1024, 768, 75, 4, 3, 60000, 78750},
{1280, 1024, 75, 5, 4, 80000, 135000},
/* 0x25 bit 7*/
{1152, 870, 75, 192, 145, 67500, 108000},
};
static const struct {
int x, y, refresh, ratio_w, ratio_h;
int hor_freq_hz, pixclk_khz, rb;
} established_timings3[] = {
/* 0x06 bit 7 - 0 */
{640, 350, 85, 64, 35, 37900, 31500},
{640, 400, 85, 16, 10, 37900, 31500},
{720, 400, 85, 9, 5, 37900, 35500},
{640, 480, 85, 4, 3, 43300, 36000},
{848, 480, 60, 53, 30, 31000, 33750},
{800, 600, 85, 4, 3, 53700, 56250},
{1024, 768, 85, 4, 3, 68700, 94500},
{1152, 864, 75, 4, 3, 67500, 108000},
/* 0x07 bit 7 - 0 */
{1280, 768, 60, 5, 3, 47400, 68250, 1},
{1280, 768, 60, 5, 3, 47800, 79500},
{1280, 768, 75, 5, 3, 60300, 102250},
{1280, 768, 85, 5, 3, 68600, 117500},
{1280, 960, 60, 4, 3, 60000, 108000},
{1280, 960, 85, 4, 3, 85900, 148500},
{1280, 1024, 60, 5, 4, 64000, 108000},
{1280, 1024, 85, 5, 4, 91100, 157500},
/* 0x08 bit 7 - 0 */
{1360, 768, 60, 85, 48, 47700, 85500},
{1440, 900, 60, 16, 10, 55500, 88750, 1},
{1440, 900, 60, 16, 10, 65300, 121750},
{1440, 900, 75, 16, 10, 82300, 156000},
{1440, 900, 85, 16, 10, 93900, 179500},
{1400, 1050, 60, 4, 3, 64700, 101000, 1},
{1400, 1050, 60, 4, 3, 65300, 121750},
{1400, 1050, 75, 4, 3, 82300, 156000},
/* 0x09 bit 7 - 0 */
{1400, 1050, 85, 4, 3, 93900, 179500},
{1680, 1050, 60, 16, 10, 64700, 119000, 1},
{1680, 1050, 60, 16, 10, 65300, 146250},
{1680, 1050, 75, 16, 10, 82300, 187000},
{1680, 1050, 85, 16, 10, 93900, 214750},
{1600, 1200, 60, 4, 3, 75000, 162000},
{1600, 1200, 65, 4, 3, 81300, 175500},
{1600, 1200, 70, 4, 3, 87500, 189000},
/* 0x0a bit 7 - 0 */
{1600, 1200, 75, 4, 3, 93800, 202500},
{1600, 1200, 85, 4, 3, 106300, 229500},
{1792, 1344, 60, 4, 3, 83600, 204750},
{1792, 1344, 75, 4, 3, 106300, 261000},
{1856, 1392, 60, 4, 3, 86300, 218250},
{1856, 1392, 75, 4, 3, 112500, 288000},
{1920, 1200, 60, 16, 10, 74000, 154000, 1},
{1920, 1200, 60, 16, 10, 74600, 193250},
/* 0x0b bit 7 - 4 */
{1920, 1200, 75, 16, 10, 94000, 245250},
{1920, 1200, 85, 16, 10, 107200, 281250},
{1920, 1440, 60, 4, 3, 90000, 234000},
{1920, 1440, 75, 4, 3, 112500, 297000},
};
/* 1 means valid data */
static int detailed_block(const unsigned char *x, int in_extension)
{
int ha, hbl, va, vbl;
int refresh, pixclk_khz;
int i;
if (x[0] == 0 && x[1] == 0) {
/* Monitor descriptor block, not detailed timing descriptor. */
if (x[2] != 0) {
/* 1.3, 3.10.3 */
has_valid_descriptor_pad = 0;
}
if (x[3] != 0xfd && x[4] != 0x00) {
/* 1.3, 3.10.3 */
has_valid_descriptor_pad = 0;
}
seen_non_detailed_descriptor = 1;
if (x[3] <= 0xF) {
/*
* in principle we can decode these, if we know what they are.
* 0x0f seems to be common in laptop panels.
* 0x0e is used by EPI: http://www.epi-standard.org/
*/
return 1;
}
switch (x[3]) {
case 0x10:
for (i = 5; i < 18; i++)
if (x[i] != 0x00)
has_valid_dummy_block = 0;
return 1;
case 0xF7:
for (i = 0; i < 44; i++) {
if (x[6 + i / 8] & (1 << (7 - i % 8))) {
min_vert_freq_hz = min(min_vert_freq_hz, established_timings3[i].refresh);
max_vert_freq_hz = max(max_vert_freq_hz, established_timings3[i].refresh);
min_hor_freq_hz = min(min_hor_freq_hz, established_timings3[i].hor_freq_hz);
max_hor_freq_hz = max(max_hor_freq_hz, established_timings3[i].hor_freq_hz);
max_pixclk_khz = max(max_pixclk_khz, established_timings3[i].pixclk_khz);
}
}
return 1;
case 0xF8: {
int valid_cvt = 1; /* just this block */
if (x[5] != 0x01) {
has_valid_cvt = 0;
return 0;
}
for (i = 0; i < 4; i++)
valid_cvt &= detailed_cvt_descriptor(x + 6 + (i * 3), (i == 0));
has_valid_cvt &= valid_cvt;
return valid_cvt;
}
case 0xF9:
return 1;
case 0xFA:
return 1;
case 0xFB: {
if (x[10] == 0)
return 1;
return 1;
}
case 0xFC:
has_name_descriptor = 1;
strcpy(model_string, extract_string(x + 5, &has_valid_name_descriptor, 13));
return 1;
case 0xFD: {
int h_max_offset = 0, h_min_offset = 0;
int v_max_offset = 0, v_min_offset = 0;
int is_cvt = 0;
has_range_descriptor = 1;
/*
* XXX todo: implement feature flags, vtd blocks
* XXX check: ranges are well-formed; block termination if no vtd
*/
if (claims_one_point_four) {
if (x[4] & 0x02) {
v_max_offset = 255;
if (x[4] & 0x01) {
v_min_offset = 255;
}
}
if (x[4] & 0x04) {
h_max_offset = 255;
if (x[4] & 0x03) {
h_min_offset = 255;
}
}
} else if (x[4]) {
has_valid_range_descriptor = 0;
}
if (x[5] + v_min_offset > x[6] + v_max_offset)
has_valid_range_descriptor = 0;
mon_min_vert_freq_hz = x[5] + v_min_offset;
mon_max_vert_freq_hz = x[6] + v_max_offset;
if (x[7] + h_min_offset > x[8] + h_max_offset)
has_valid_range_descriptor = 0;
mon_min_hor_freq_hz = (x[7] + h_min_offset) * 1000;
mon_max_hor_freq_hz = (x[8] + h_max_offset) * 1000;
if (x[9]) {
mon_max_pixclk_khz = x[9] * 10000;
} else {
if (claims_one_point_four)
has_valid_max_dotclock = 0;
}
if (is_cvt) {
if (x[12] & 0xfc) {
int raw_offset = (x[12] & 0xfc) >> 2;
if (raw_offset >= 40)
warning_excessive_dotclock_correction = 1;
}
if (x[14] & 0x07)
has_valid_range_descriptor = 0;
#if 0
switch((x[15] & 0xe0) >> 5) {
case 0x00: printf("4:3"); break;
case 0x01: printf("16:9"); break;
case 0x02: printf("16:10"); break;
case 0x03: printf("5:4"); break;
case 0x04: printf("15:9"); break;
default: printf("(broken)"); break;
}
#endif
if (x[15] & 0x07)
has_valid_range_descriptor = 0;
if (x[16] & 0x0f)
has_valid_range_descriptor = 0;
}
/*
* Slightly weird to return a global, but I've never seen any
* EDID block wth two range descriptors, so it's harmless.
*/
return has_valid_range_descriptor;
}
case 0xFE:
/*
* TODO: Two of these in a row, in the third and fourth slots,
* seems to be specified by SPWG: http://www.spwg.org/
*/
has_ascii_string = 1;
return 1;
case 0xFF:
has_serial_string = 1;
strcpy(serial_string, extract_string(x + 5, &has_valid_serial_string, 13));
return 1;
default:
return 0;
}
}
if (seen_non_detailed_descriptor && !in_extension) {
has_valid_descriptor_ordering = 0;
}
did_detailed_timing = 1;
ha = (x[2] + ((x[4] & 0xF0) << 4));
hbl = (x[3] + ((x[4] & 0x0F) << 8));
va = (x[5] + ((x[7] & 0xF0) << 4));
vbl = (x[6] + ((x[7] & 0x0F) << 8));
pixclk_khz = (x[0] + (x[1] << 8)) * 10;
refresh = (pixclk_khz * 1000) / ((ha + hbl) * (va + vbl));
min_vert_freq_hz = min(min_vert_freq_hz, refresh);
max_vert_freq_hz = max(max_vert_freq_hz, refresh);
min_hor_freq_hz = min(min_hor_freq_hz, (pixclk_khz * 1000) / (ha + hbl));
max_hor_freq_hz = max(max_hor_freq_hz, (pixclk_khz * 1000) / (ha + hbl));
max_pixclk_khz = max(max_pixclk_khz, pixclk_khz);
/* XXX flag decode */
return 1;
}
static int do_checksum(const unsigned char *x, size_t len)
{
unsigned char check = x[len - 1];
unsigned char sum = 0;
int i;
for (i = 0; i < len-1; i++)
sum += x[i];
if ((unsigned char)(check + sum) != 0) {
return 0;
}
return 1;
}
/* CTA extension */
struct edid_cta_mode {
const char *name;
int refresh, hor_freq_hz, pixclk_khz;
};
static struct {
const char *name;
int refresh, hor_freq_hz, pixclk_khz;
} edid_hdmi_modes[] = {
{"3840x2160@30Hz 16:9", 30, 67500, 297000},
{"3840x2160@25Hz 16:9", 25, 56250, 297000},
{"3840x2160@24Hz 16:9", 24, 54000, 297000},
{"4096x2160@24Hz 256:135", 24, 54000, 297000},
};
static void cta_hdmi_block(const unsigned char *x, unsigned int length)
{
int mask = 0, formats = 0;
int len_vic, len_3d;
int b = 0;
if (length < 6)
return;
if (length < 7)
return;
if (x[6] * 5 > 340)
nonconformant_hdmi_vsdb_tmds_rate = 1;
/* XXX the walk here is really ugly, and needs to be length-checked */
if (length < 8)
return;
if (x[7] & 0x80) {
b += 2;
if (x[7] & 0x40) {
b += 2;
}
}
if (!(x[7] & 0x20))
return;
if ((x[8 + b] & 0x60) == 0x20) {
formats = 1;
}
if ((x[8 + b] & 0x60) == 0x40) {
formats = 1;
mask = 1;
}
switch (x[8 + b] & 0x18) {
case 0x00: break;
case 0x08:
break;
case 0x10:
break;
case 0x18:
break;
}
len_vic = (x[9 + b] & 0xe0) >> 5;
len_3d = (x[9 + b] & 0x1f) >> 0;
b += 2;
if (len_vic) {
unsigned hfreq = 0;
unsigned clock_khz = 0;
int i;
for (i = 0; i < len_vic; i++) {
unsigned char vic = x[8 + b + i];
if (vic && vic <= ARRAY_SIZE(edid_hdmi_modes)) {
supported_hdmi_vic_codes |= 1 << (vic - 1);
min_vert_freq_hz = min(min_vert_freq_hz, edid_hdmi_modes[vic - 1].refresh);
max_vert_freq_hz = max(max_vert_freq_hz, edid_hdmi_modes[vic - 1].refresh);
hfreq = edid_hdmi_modes[vic - 1].hor_freq_hz;
min_hor_freq_hz = min(min_hor_freq_hz, hfreq);
max_hor_freq_hz = max(max_hor_freq_hz, hfreq);
clock_khz = edid_hdmi_modes[vic - 1].pixclk_khz;
max_pixclk_khz = max(max_pixclk_khz, clock_khz);
}
}
b += len_vic;
}
if (len_3d) {
if (formats) {
b += 2;
len_3d -= 2;
}
if (mask) {
b += 2;
len_3d -= 2;
}
/*
* list of nibbles:
* 2D_VIC_Order_X
* 3D_Structure_X
* (optionally: 3D_Detail_X and reserved)
*/
if (len_3d > 0) {
int end = b + len_3d;
while (b < end) {
switch (x[8 + b] & 0x0f) {
case 0: break;
case 6: break;
case 8:
if ((x[9 + b] >> 4) == 1) {
break;
}
default: break;
}
if ((x[8 + b] & 0x0f) > 7) {
/* Optional 3D_Detail_X and reserved */
b++;
}
b++;
}
}
}
}
DEFINE_FIELD("YCbCr quantization", YCbCr_quantization, 7, 7,
{ 0, "No Data" },
{ 1, "Selectable (via AVI YQ)" });
DEFINE_FIELD("RGB quantization", RGB_quantization, 6, 6,
{ 0, "No Data" },
{ 1, "Selectable (via AVI Q)" });
DEFINE_FIELD("PT scan behaviour", PT_scan, 4, 5,
{ 0, "No Data" },
{ 1, "Always Overscannned" },
{ 2, "Always Underscanned" },
{ 3, "Support both over- and underscan" });
DEFINE_FIELD("IT scan behaviour", IT_scan, 2, 3,
{ 0, "IT video formats not supported" },
{ 1, "Always Overscannned" },
{ 2, "Always Underscanned" },
{ 3, "Support both over- and underscan" });
DEFINE_FIELD("CE scan behaviour", CE_scan, 0, 1,
{ 0, "CE video formats not supported" },
{ 1, "Always Overscannned" },
{ 2, "Always Underscanned" },
{ 3, "Support both over- and underscan" });
static struct field *vcdb_fields[] = {
&YCbCr_quantization,
&RGB_quantization,
&PT_scan,
&IT_scan,
&CE_scan,
};
static void cta_vcdb(const unsigned char *x, unsigned int length)
{
unsigned char d = x[0];
decode(vcdb_fields, d, " ");
}
static void cta_block(const unsigned char *x)
{
static int last_block_was_hdmi_vsdb;
unsigned int length = x[0] & 0x1f;
unsigned int oui;
switch ((x[0] & 0xe0) >> 5) {
case 0x01:
break;
case 0x02:
break;
case 0x03:
/* yes really, endianness lols */
oui = (x[3] << 16) + (x[2] << 8) + x[1];
if (oui == 0x000c03) {
cta_hdmi_block(x + 1, length);
last_block_was_hdmi_vsdb = 1;
return;
}
if (oui == 0xc45dd8) {
if (!last_block_was_hdmi_vsdb)
nonconformant_hf_vsdb_position = 1;
}
break;
case 0x04:
break;
case 0x05:
break;
case 0x07:
switch (x[1]) {
case 0x00:
cta_vcdb(x + 2, length - 1);
break;
case 0x01:
break;
case 0x02:
break;
case 0x03:
break;
case 0x04:
break;
case 0x05:
break;
case 0x06:
break;
case 0x07:
break;
case 0x0d:
break;
case 0x0e:
break;
case 0x0f:
break;
case 0x10:
break;
case 0x11:
break;
case 0x12:
break;
case 0x13:
break;
case 0x14:
break;
case 0x20:
break;
default:
break;
}
break;
default:
break;
}
last_block_was_hdmi_vsdb = 0;
}
static int parse_cta(const unsigned char *x)
{
int ret = 0;
int version = x[1];
int offset = x[2];
const unsigned char *detailed;
if (version >= 1) do {
if (version == 1 && x[3] != 0)
ret = 1;
if (offset < 4)
break;
if (version < 3) {
if (offset - 4 > 0)
/* do stuff */ ;
} else if (version == 3) {
int i;
for (i = 4; i < offset; i += (x[i] & 0x1f) + 1) {
cta_block(x + i);
}
}
for (detailed = x + offset; detailed + 18 < x + 127; detailed += 18)
if (detailed[0])
detailed_block(detailed, 1);