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edid.c
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/*
* Copyright 2013 Google Inc.
* 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 <ajax@nwnk.net> */
/* this is a pretty robust parser for EDID, and we're tasked with parsing
* an arbitrary panel. We will pass it a raw EDID block and a struct which
* it must fill in with values. The set of values we need is pretty limited
* at present.
*/
#include <assert.h>
#include <stddef.h>
#include <ctype.h>
#include <stdint.h>
#include <string.h>
#include <edid.h>
#include <helpers.h>
#define EDID_LOGENABLED 0
#if EDID_LOGENABLED
#define EDIDERROR(format, ...) \
printk(BIOS_ERR, "ERROR: %s: " format, __func__, ##__VA_ARGS__)
#define EDIDWARNING(format, ...) \
printk(BIOS_WARNING, "%s: " format, __func__, ##__VA_ARGS__)
#define EDIDDEBUG(format, ...) \
printk(BIOS_SPEW, "%s: " format, __func__, ##__VA_ARGS__)
#else
#define EDIDERROR(format ...) \
do { } while (0)
#define EDIDWARNING(format ...) \
do { } while (0)
#define EDIDDEBUG(format ...) \
do { } while (0)
#endif
struct edid_context {
int claims_one_point_oh;
int claims_one_point_two;
int claims_one_point_three;
int claims_one_point_four;
int nonconformant_digital_display;
int nonconformant_extension;
int did_detailed_timing;
int has_name_descriptor;
int has_range_descriptor;
int has_preferred_timing;
int has_valid_checksum;
int has_valid_cvt;
int has_valid_dummy_block;
int has_valid_week;
int has_valid_year;
int has_valid_detailed_blocks;
int has_valid_extension_count;
int has_valid_descriptor_ordering;
int has_valid_descriptor_pad;
int has_valid_range_descriptor;
int has_valid_max_dotclock;
int has_valid_string_termination;
int manufacturer_name_well_formed;
int seen_non_detailed_descriptor;
int warning_excessive_dotclock_correction;
int warning_zero_preferred_refresh;
enum edid_status conformant;
};
/* Stuff that isn't used anywhere but is nice to pretty-print while
we're decoding everything else. */
static struct {
unsigned int model;
unsigned int serial;
unsigned int year;
unsigned int week;
unsigned int version[2];
unsigned int nonconformant;
unsigned int type;
unsigned int x_mm;
unsigned int y_mm;
unsigned int voltage;
unsigned int sync;
const char *syncmethod;
const char *range_class;
const char *stereo;
} extra_info;
static struct edid tmp_edid;
static int manufacturer_name(unsigned char *x, char *output)
{
output[0] = ((x[0] & 0x7C) >> 2) + '@';
output[1] = ((x[0] & 0x03) << 3) + ((x[1] & 0xE0) >> 5) + '@';
output[2] = (x[1] & 0x1F) + '@';
output[3] = 0;
if (isupper(output[0]) &&
isupper(output[1]) &&
isupper(output[2]))
return 1;
memset(output, 0, 4);
return 0;
}
static int
detailed_cvt_descriptor(unsigned char *x, int first)
{
const unsigned char empty[3] = { 0, 0, 0 };
static const char *names[] = { "50", "60", "75", "85" };
int width = 0, height = 0;
int valid = 1;
int fifty = 0, sixty = 0, seventyfive = 0, eightyfive = 0, reduced = 0;
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 = (height * 4) / 3; break;
case 0x04:
width = (height * 16) / 9; break;
case 0x08:
width = (height * 16) / 10; break;
case 0x0c:
width = (height * 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);
if (!valid) {
EDIDDEBUG( " (broken)\n");
} else {
EDIDDEBUG(
" %dx%d @ (%s%s%s%s%s) Hz (%s%s preferred)\n",
width, height,
fifty ? "50 " : "",
sixty ? "60 " : "",
seventyfive ? "75 " : "",
eightyfive ? "85 " : "",
reduced ? "60RB " : "",
names[(x[2] & 0x60) >> 5],
(((x[2] & 0x60) == 0x20) && reduced) ? "RB" : "");
}
return valid;
}
/* extract a CP437 string from a detailed subblock, checking for termination (if
* less than len of bytes) with LF and padded with SP.
*/
static char *
extract_string(unsigned char *x, int *valid_termination, int len)
{
static char ret[EDID_ASCII_STRING_LENGTH + 1];
int i, seen_newline = 0;
memset(ret, 0, sizeof(ret));
for (i = 0; i < MIN(len, EDID_ASCII_STRING_LENGTH); i++) {
if (seen_newline) {
if (x[i] != 0x20) {
*valid_termination = 0;
return ret;
}
} else if (x[i] == 0x0a) {
seen_newline = 1;
} else {
/* normal characters */
ret[i] = x[i];
}
}
return ret;
}
/* 1 means valid data */
static int
detailed_block(struct edid *result_edid, unsigned char *x, int in_extension,
struct edid_context *c)
{
struct edid *out = &tmp_edid;
int i;
if (console_log_level(BIOS_SPEW)) {
EDIDDEBUG( "Hex of detail: ");
for (i = 0; i < 18; i++)
EDIDDEBUG( "%02x", x[i]);
EDIDDEBUG( "\n");
}
/* Result might already have some valid fields like mode_is_supported */
*out = *result_edid;
if (x[0] == 0 && x[1] == 0) {
/* Monitor descriptor block, not detailed timing descriptor. */
if (x[2] != 0) {
/* 1.3, 3.10.3 */
EDIDDEBUG(
"Monitor descriptor block has byte 2 nonzero (0x%02x)\n",
x[2]);
c->has_valid_descriptor_pad = 0;
}
if (x[3] != 0xfd && x[4] != 0x00) {
/* 1.3, 3.10.3 */
EDIDDEBUG(
"Monitor descriptor block has byte 4 nonzero (0x%02x)\n",
x[4]);
c->has_valid_descriptor_pad = 0;
}
c->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/
*/
EDIDDEBUG(
"Manufacturer-specified data, tag %d\n", x[3]);
return 1;
}
switch (x[3]) {
case 0x10:
EDIDDEBUG( "Dummy block\n");
for (i = 5; i < 18; i++)
if (x[i] != 0x00)
c->has_valid_dummy_block = 0;
return 1;
case 0xF7:
/* TODO */
EDIDDEBUG( "Established timings III\n");
return 1;
case 0xF8:
{
int valid_cvt = 1; /* just this block */
EDIDDEBUG( "CVT 3-byte code descriptor:\n");
if (x[5] != 0x01) {
c->has_valid_cvt = 0;
return 0;
}
for (i = 0; i < 4; i++)
valid_cvt &= detailed_cvt_descriptor(x + 6
+ (i * 3), (i == 0));
c->has_valid_cvt &= valid_cvt;
return 1;
}
case 0xF9:
/* TODO */
EDIDDEBUG( "Color management data\n");
return 1;
case 0xFA:
/* TODO */
EDIDDEBUG( "More standard timings\n");
return 1;
case 0xFB:
/* TODO */
EDIDDEBUG( "Color point\n");
return 1;
case 0xFC:
EDIDDEBUG( "Monitor name: %s\n",
extract_string(x + 5,
&c->has_valid_string_termination,
EDID_ASCII_STRING_LENGTH));
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;
c->has_range_descriptor = 1;
extra_info.range_class = "";
/*
* XXX todo: implement feature flags, vtd blocks
* XXX check: ranges are well-formed; block termination
* if no vtd
*/
if (c->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]) {
c->has_valid_range_descriptor = 0;
}
/*
* despite the values, this is not a bitfield.
*/
switch (x[10]) {
case 0x00: /* default gtf */
extra_info.range_class = "GTF";
break;
case 0x01: /* range limits only */
extra_info.range_class = "bare limits";
if (!c->claims_one_point_four)
c->has_valid_range_descriptor = 0;
break;
case 0x02: /* secondary gtf curve */
extra_info.range_class = "GTF with icing";
break;
case 0x04: /* cvt */
extra_info.range_class = "CVT";
is_cvt = 1;
if (!c->claims_one_point_four)
c->has_valid_range_descriptor = 0;
break;
default: /* invalid */
c->has_valid_range_descriptor = 0;
extra_info.range_class = "invalid";
break;
}
if (x[5] + v_min_offset > x[6] + v_max_offset)
c->has_valid_range_descriptor = 0;
if (x[7] + h_min_offset > x[8] + h_max_offset)
c->has_valid_range_descriptor = 0;
EDIDDEBUG(
"Monitor ranges (%s): %d-%dHz V, %d-%dkHz H",
extra_info.range_class,
x[5] + v_min_offset, x[6] + v_max_offset,
x[7] + h_min_offset, x[8] + h_max_offset);
if (x[9])
EDIDDEBUG(
", max dotclock %dMHz\n", x[9] * 10);
else {
if (c->claims_one_point_four)
c->has_valid_max_dotclock = 0;
EDIDDEBUG( "\n");
}
if (is_cvt) {
int max_h_pixels = 0;
EDIDDEBUG( "CVT version %d.%d\n",
x[11] & 0xf0 >> 4, x[11] & 0x0f);
if (x[12] & 0xfc) {
int raw_offset = (x[12] & 0xfc) >> 2;
EDIDDEBUG(
"Real max dotclock: %dKHz\n",
(x[9] * 10000)
- (raw_offset * 250));
if (raw_offset >= 40)
c->warning_excessive_dotclock_correction = 1;
}
max_h_pixels = x[12] & 0x03;
max_h_pixels <<= 8;
max_h_pixels |= x[13];
max_h_pixels *= 8;
if (max_h_pixels)
EDIDDEBUG(
"Max active pixels per line: %d\n",
max_h_pixels);
EDIDDEBUG(
"Supported aspect ratios: %s %s %s %s %s\n",
x[14] & 0x80 ? "4:3" : "",
x[14] & 0x40 ? "16:9" : "",
x[14] & 0x20 ? "16:10" : "",
x[14] & 0x10 ? "5:4" : "",
x[14] & 0x08 ? "15:9" : "");
if (x[14] & 0x07)
c->has_valid_range_descriptor = 0;
EDIDDEBUG( "Preferred aspect ratio: ");
switch ((x[15] & 0xe0) >> 5) {
case 0x00:
EDIDDEBUG( "4:3");
break;
case 0x01:
EDIDDEBUG( "16:9");
break;
case 0x02:
EDIDDEBUG( "16:10");
break;
case 0x03:
EDIDDEBUG( "5:4");
break;
case 0x04:
EDIDDEBUG( "15:9");
break;
default:
EDIDDEBUG( "(broken)");
break;
}
EDIDDEBUG( "\n");
if (x[15] & 0x04)
EDIDDEBUG(
"Supports CVT standard blanking\n");
if (x[15] & 0x10)
EDIDDEBUG(
"Supports CVT reduced blanking\n");
if (x[15] & 0x07)
c->has_valid_range_descriptor = 0;
if (x[16] & 0xf0) {
EDIDDEBUG(
"Supported display scaling:\n");
if (x[16] & 0x80)
EDIDDEBUG(
" Horizontal shrink\n");
if (x[16] & 0x40)
EDIDDEBUG(
" Horizontal stretch\n");
if (x[16] & 0x20)
EDIDDEBUG(
" Vertical shrink\n");
if (x[16] & 0x10)
EDIDDEBUG(
" Vertical stretch\n");
}
if (x[16] & 0x0f)
c->has_valid_range_descriptor = 0;
if (x[17])
EDIDDEBUG(
"Preferred vertical refresh: %d Hz\n",
x[17]);
else
c->warning_zero_preferred_refresh = 1;
}
/*
* Slightly weird to return a global, but I've never
* seen any EDID block wth two range descriptors, so
* it's harmless.
*/
return 1;
}
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/
*/
strcpy(result_edid->ascii_string, extract_string(x + 5,
&c->has_valid_string_termination,
EDID_ASCII_STRING_LENGTH));
EDIDDEBUG( "ASCII string: %s\n",
result_edid->ascii_string);
return 1;
case 0xFF:
EDIDDEBUG( "Serial number: %s\n",
extract_string(x + 5,
&c->has_valid_string_termination,
EDID_ASCII_STRING_LENGTH));
return 1;
default:
EDIDDEBUG(
"Unknown monitor description type %d\n",
x[3]);
return 0;
}
}
if (c->seen_non_detailed_descriptor && !in_extension)
c->has_valid_descriptor_ordering = 0;
bool supported = true;
if ((x[0] + (x[1] << 8)) * 10 > 62500) {
supported = false;
EDIDDEBUG(
"Not supported on stm32\n");
}
/* Edid contains pixel clock in terms of 10KHz */
out->mode.pixel_clock = (x[0] + (x[1] << 8)) * 10;
/*
LVDS supports following pixel clocks
25000...112000 kHz: single channel
80000...224000 kHz: dual channel
There is some overlap in theoretically supported
pixel clock between single-channel and dual-channel.
In practice with current panels all panels
<= 75200 kHz: single channel
>= 97750 kHz: dual channel
We have no samples between those values, so put a
threshold at 95000 kHz. If we get anything over
95000 kHz with single channel, we can make this
more sofisticated but it's currently not needed.
*/
out->mode.lvds_dual_channel = (out->mode.pixel_clock >= 95000);
extra_info.x_mm = (x[12] + ((x[14] & 0xF0) << 4));
extra_info.y_mm = (x[13] + ((x[14] & 0x0F) << 8));
out->mode.ha = (x[2] + ((x[4] & 0xF0) << 4));
out->mode.hbl = (x[3] + ((x[4] & 0x0F) << 8));
out->mode.hso = (x[8] + ((x[11] & 0xC0) << 2));
out->mode.hspw = (x[9] + ((x[11] & 0x30) << 4));
out->mode.hborder = x[15];
out->mode.va = (x[5] + ((x[7] & 0xF0) << 4));
out->mode.vbl = (x[6] + ((x[7] & 0x0F) << 8));
out->mode.vso = ((x[10] >> 4) + ((x[11] & 0x0C) << 2));
out->mode.vspw = ((x[10] & 0x0F) + ((x[11] & 0x03) << 4));
out->mode.vborder = x[16];
/* We assume rgb888 (32 bits per pixel) framebuffers by default.
* Chipsets that want something else will need to override this with
* another call to edid_set_framebuffer_bits_per_pixel(). As a cheap
* heuristic, assume that X86 systems require a 64-byte row alignment
* (since that seems to be true for most Intel chipsets). */
if (CONFIG(ARCH_X86))
edid_set_framebuffer_bits_per_pixel(out, 32, 64);
else
edid_set_framebuffer_bits_per_pixel(out, 16, 0);
switch ((x[17] & 0x18) >> 3) {
case 0x00:
extra_info.syncmethod = " analog composite";
break;
case 0x01:
extra_info.syncmethod = " bipolar analog composite";
break;
case 0x02:
extra_info.syncmethod = " digital composite";
break;
case 0x03:
extra_info.syncmethod = "";
break;
}
out->mode.pvsync = (x[17] & (1 << 2)) ? '+' : '-';
out->mode.phsync = (x[17] & (1 << 1)) ? '+' : '-';
switch (x[17] & 0x61) {
case 0x20:
extra_info.stereo = "field sequential L/R";
break;
case 0x40:
extra_info.stereo = "field sequential R/L";
break;
case 0x21:
extra_info.stereo = "interleaved right even";
break;
case 0x41:
extra_info.stereo = "interleaved left even";
break;
case 0x60:
extra_info.stereo = "four way interleaved";
break;
case 0x61:
extra_info.stereo = "side by side interleaved";
break;
default:
extra_info.stereo = "";
break;
}
EDIDDEBUG(
"Detailed mode (IN HEX): Clock %d KHz, %x mm x %x mm\n"
" %04x %04x %04x %04x hborder %x\n"
" %04x %04x %04x %04x vborder %x\n"
" %chsync %cvsync%s%s %s\n",
out->mode.pixel_clock,
extra_info.x_mm,
extra_info.y_mm,
out->mode.ha, out->mode.ha + out->mode.hso,
out->mode.ha + out->mode.hso + out->mode.hspw,
out->mode.ha + out->mode.hbl, out->mode.hborder,
out->mode.va, out->mode.va + out->mode.vso,
out->mode.va + out->mode.vso + out->mode.vspw,
out->mode.va + out->mode.vbl, out->mode.vborder,
out->mode.phsync, out->mode.pvsync,
extra_info.syncmethod, x[17] & 0x80 ? " interlaced" : "",
extra_info.stereo);
if (!c->did_detailed_timing && supported) {
EDIDDEBUG( "Did detailed timing\n");
c->did_detailed_timing = 1;
*result_edid = *out;
}
return 1;
}
static int
do_checksum(unsigned char *x)
{
int valid = 0;
EDIDDEBUG( "Checksum: 0x%hhx", x[0x7f]);
{
unsigned char sum = 0;
int i;
for (i = 0; i < 128; i++)
sum += x[i];
if (sum) {
EDIDDEBUG( " (should be 0x%hhx)",
(unsigned char)(x[0x7f] - sum));
} else {
valid = 1;
EDIDDEBUG( " (valid)");
}
}
EDIDDEBUG( "\n");
return valid;
}
/* CEA extension */
static const char *
audio_format(unsigned char x)
{
switch (x) {
case 0: return "RESERVED";
case 1: return "Linear PCM";
case 2: return "AC-3";
case 3: return "MPEG 1 (Layers 1 & 2)";
case 4: return "MPEG 1 Layer 3 (MP3)";
case 5: return "MPEG2 (multichannel)";
case 6: return "AAC";
case 7: return "DTS";
case 8: return "ATRAC";
case 9: return "One Bit Audio";
case 10: return "Dolby Digital+";
case 11: return "DTS-HD";
case 12: return "MAT (MLP)";
case 13: return "DST";
case 14: return "WMA Pro";
case 15: return "RESERVED";
}
return "BROKEN"; /* can't happen */
}
static void
cea_audio_block(unsigned char *x)
{
int i, format;
int length = x[0] & 0x1f;
if (length % 3) {
EDIDDEBUG( "Broken CEA audio block length %d\n", length);
/* XXX non-conformant */
return;
}
for (i = 1; i < length; i += 3) {
format = (x[i] & 0x78) >> 3;
EDIDDEBUG( " %s, max channels %d\n",
audio_format(format), x[i] & 0x07);
EDIDDEBUG(
" Supported sample rates (kHz):%s%s%s%s%s%s%s\n",
(x[i+1] & 0x40) ? " 192" : "",
(x[i+1] & 0x20) ? " 176.4" : "",
(x[i+1] & 0x10) ? " 96" : "",
(x[i+1] & 0x08) ? " 88.2" : "",
(x[i+1] & 0x04) ? " 48" : "",
(x[i+1] & 0x02) ? " 44.1" : "",
(x[i+1] & 0x01) ? " 32" : "");
if (format == 1) {
EDIDDEBUG(
" Supported sample sizes (bits):%s%s%s\n",
(x[2] & 0x04) ? " 24" : "",
(x[2] & 0x02) ? " 20" : "",
(x[2] & 0x01) ? " 16" : "");
} else if (format <= 8) {
EDIDDEBUG(
" Maximum bit rate: %d kHz\n", x[2] * 8);
}
}
}
static void
cea_video_block(unsigned char *x)
{
int i;
int length = x[0] & 0x1f;
for (i = 1; i < length; i++)
EDIDDEBUG( " VIC %02d %s\n", x[i] & 0x7f,
x[i] & 0x80 ? "(native)" : "");
}
static void
cea_hdmi_block(struct edid *out, unsigned char *x)
{
int length = x[0] & 0x1f;
out->hdmi_monitor_detected = 1;
EDIDDEBUG( " (HDMI)\n");
EDIDDEBUG(
" Source physical address %d.%d.%d.%d\n",
x[4] >> 4, x[4] & 0x0f, x[5] >> 4, x[5] & 0x0f);
if (length > 5) {
if (x[6] & 0x80)
EDIDDEBUG( " Supports_AI\n");
if (x[6] & 0x40)
EDIDDEBUG( " DC_48bit\n");
if (x[6] & 0x20)
EDIDDEBUG( " DC_36bit\n");
if (x[6] & 0x10)
EDIDDEBUG( " DC_30bit\n");
if (x[6] & 0x08)
EDIDDEBUG( " DC_Y444\n");
/* two reserved */
if (x[6] & 0x01)
EDIDDEBUG( " DVI_Dual\n");
}
if (length > 6)
EDIDDEBUG( " Maximum TMDS clock: %dMHz\n", x[7] * 5);
/* XXX the walk here is really ugly, and needs to be length-checked */
if (length > 7) {
int b = 0;
if (x[8] & 0x80) {
EDIDDEBUG( " Video latency: %d\n", x[9 + b]);
EDIDDEBUG( " Audio latency: %d\n", x[10 + b]);
b += 2;
}
if (x[8] & 0x40) {
EDIDDEBUG(
" Interlaced video latency: %d\n", x[9 + b]);
EDIDDEBUG(
" Interlaced audio latency: %d\n",
x[10 + b]);
b += 2;
}
if (x[8] & 0x20) {
int mask = 0, formats = 0;
int len_xx, len_3d;
EDIDDEBUG( " Extended HDMI video details:\n");
if (x[9 + b] & 0x80)
EDIDDEBUG( " 3D present\n");
if ((x[9 + b] & 0x60) == 0x20) {
EDIDDEBUG(
" All advertised VICs are 3D-capable\n");
formats = 1;
}
if ((x[9 + b] & 0x60) == 0x40) {
EDIDDEBUG(
" 3D-capable-VIC mask present\n");
formats = 1;
mask = 1;
}
switch (x[9 + b] & 0x18) {
case 0x00:
break;
case 0x08:
EDIDDEBUG( " Base EDID image size is aspect ratio\n");
break;
case 0x10:
EDIDDEBUG( " Base EDID image size is in units of 1cm\n");
break;
case 0x18:
EDIDDEBUG( " Base EDID image size is in units of 5cm\n");
break;
}
len_xx = (x[10 + b] & 0xe0) >> 5;
len_3d = (x[10 + b] & 0x1f) >> 0;
b += 2;
if (len_xx) {
EDIDDEBUG( " Skipping %d bytes that HDMI refuses to publicly"
" document\n", len_xx);
b += len_xx;
}
if (len_3d) {
if (formats) {
if (x[9 + b] & 0x01)
EDIDDEBUG( " Side-by-side 3D supported\n");
if (x[10 + b] & 0x40)
EDIDDEBUG( " Top-and-bottom 3D supported\n");
if (x[10 + b] & 0x01)
EDIDDEBUG( " Frame-packing 3D supported\n");
b += 2;
}
if (mask) {
int i;
EDIDDEBUG(
" 3D VIC indices:");
/* worst bit ordering ever */
for (i = 0; i < 8; i++)
if (x[10 + b] & (1 << i))
EDIDDEBUG(
" %d", i);
for (i = 0; i < 8; i++)
if (x[9 + b] & (1 << i))
EDIDDEBUG(
" %d", i + 8);
EDIDDEBUG( "\n");
b += 2;
}
/*
* XXX list of nibbles:
* 2D_VIC_Order_X
* 3D_Structure_X
* (optionally: 3D_Detail_X and reserved)
*/
}
}
/* Tell static analysis we know index b is left unused. */
(void)b;
}
}
static void
cea_block(struct edid *out, unsigned char *x)
{
unsigned int oui;
switch ((x[0] & 0xe0) >> 5) {
case 0x01:
EDIDDEBUG( " Audio data block\n");
cea_audio_block(x);
break;
case 0x02:
EDIDDEBUG( " Video data block\n");
cea_video_block(x);
break;
case 0x03:
/* yes really, endianness lols */
oui = (x[3] << 16) + (x[2] << 8) + x[1];
EDIDDEBUG( " Vendor-specific data block, OUI %06x",
oui);
if (oui == 0x000c03)
cea_hdmi_block(out, x);
else
EDIDDEBUG( "\n");
break;
case 0x04:
EDIDDEBUG( " Speaker allocation data block\n");
break;
case 0x05:
EDIDDEBUG( " VESA DTC data block\n");
break;
case 0x07:
EDIDDEBUG( " Extended tag: ");
switch (x[1]) {
case 0x00:
EDIDDEBUG( "video capability data block\n");
break;
case 0x01:
EDIDDEBUG( "vendor-specific video data block\n");
break;
case 0x02:
EDIDDEBUG(
"VESA video display device information data block\n");
break;
case 0x03:
EDIDDEBUG( "VESA video data block\n");
break;
case 0x04:
EDIDDEBUG( "HDMI video data block\n");
break;
case 0x05:
EDIDDEBUG( "Colorimetry data block\n");
break;
case 0x10:
EDIDDEBUG( "CEA miscellaneous audio fields\n");
break;
case 0x11:
EDIDDEBUG( "Vendor-specific audio data block\n");
break;
case 0x12:
EDIDDEBUG( "HDMI audio data block\n");
break;
default:
if (x[1] >= 6 && x[1] <= 15)
EDIDDEBUG(
"Reserved video block (%02x)\n", x[1]);
else if (x[1] >= 19 && x[1] <= 31)
EDIDDEBUG(
"Reserved audio block (%02x)\n", x[1]);
else
EDIDDEBUG( "Unknown (%02x)\n", x[1]);
break;
}
break;
default:
{
int tag = (*x & 0xe0) >> 5;
int length = *x & 0x1f;
EDIDDEBUG(
" Unknown tag %d, length %d (raw %02x)\n",
tag, length, *x);
break;
}
}
}
static int
parse_cea(struct edid *out, unsigned char *x, struct edid_context *c)
{
int ret = 0;
int version = x[1];
int offset = x[2];
unsigned char *detailed;
if (version >= 1)
do {
if (version == 1 && x[3] != 0)
ret = 1;
if (offset < 4)
break;
if (version < 3)
EDIDDEBUG(
"%d 8-byte timing descriptors\n",
(offset - 4) / 8);
else if (version == 3) {
int i;
EDIDDEBUG(
"%d bytes of CEA data\n", offset - 4);
for (i = 4; i < offset; i += (x[i] & 0x1f) + 1)
cea_block(out, x + i);
}
if (version >= 2) {
if (x[3] & 0x80)
EDIDDEBUG(
"Underscans PC formats by default\n");
if (x[3] & 0x40)
EDIDDEBUG(
"Basic audio support\n");
if (x[3] & 0x20)
EDIDDEBUG(
"Supports YCbCr 4:4:4\n");
if (x[3] & 0x10)
EDIDDEBUG(
"Supports YCbCr 4:2:2\n");
EDIDDEBUG(
"%d native detailed modes\n",
x[3] & 0x0f);
}
for (detailed = x + offset; detailed + 18 < x + 127;
detailed += 18)
if (detailed[0])
detailed_block(out, detailed, 1, c);
} while (0);
c->has_valid_checksum &= do_checksum(x);
return ret;
}
/* generic extension code */
static void
extension_version(struct edid *out, unsigned char *x)
{
EDIDDEBUG( "Extension version: %d\n", x[1]);
}
static int
parse_extension(struct edid *out, unsigned char *x, struct edid_context *c)