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coreboot-kgpe-d16/src/lib/edid.c

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/* SPDX-License-Identifier: MIT */
/* 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 <commonlib/helpers.h>
#include <console/console.h>
#include <ctype.h>
#include <stdint.h>
#include <string.h>
#include <edid.h>
#include <vbe.h>
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) {
printk(BIOS_SPEW, " (broken)\n");
} else {
printk(BIOS_SPEW,
" %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)) {
printk(BIOS_SPEW, "Hex of detail: ");
for (i = 0; i < 18; i++)
printk(BIOS_SPEW, "%02x", x[i]);
printk(BIOS_SPEW, "\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 */
printk(BIOS_SPEW,
"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 */
printk(BIOS_SPEW,
"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/
*/
printk(BIOS_SPEW,
"Manufacturer-specified data, tag %d\n", x[3]);
return 1;
}
switch (x[3]) {
case 0x10:
printk(BIOS_SPEW, "Dummy block\n");
for (i = 5; i < 18; i++)
if (x[i] != 0x00)
c->has_valid_dummy_block = 0;
return 1;
case 0xF7:
/* TODO */
printk(BIOS_SPEW, "Established timings III\n");
return 1;
case 0xF8:
{
int valid_cvt = 1; /* just this block */
printk(BIOS_SPEW, "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 */
printk(BIOS_SPEW, "Color management data\n");
return 1;
case 0xFA:
/* TODO */
printk(BIOS_SPEW, "More standard timings\n");
return 1;
case 0xFB:
/* TODO */
printk(BIOS_SPEW, "Color point\n");
return 1;
case 0xFC:
printk(BIOS_SPEW, "Monitor name: %s\n",
extract_string(x + 5,
&c->has_valid_string_termination,
EDID_ASCII_STRING_LENGTH));
c->has_name_descriptor = 1;
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;
printk(BIOS_SPEW,
"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])
printk(BIOS_SPEW,
", max dotclock %dMHz\n", x[9] * 10);
else {
if (c->claims_one_point_four)
c->has_valid_max_dotclock = 0;
printk(BIOS_SPEW, "\n");
}
if (is_cvt) {
int max_h_pixels = 0;
printk(BIOS_SPEW, "CVT version %d.%d\n",
x[11] & 0xf0 >> 4, x[11] & 0x0f);
if (x[12] & 0xfc) {
int raw_offset = (x[12] & 0xfc) >> 2;
printk(BIOS_SPEW,
"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)
printk(BIOS_SPEW,
"Max active pixels per line: %d\n",
max_h_pixels);
printk(BIOS_SPEW,
"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;
printk(BIOS_SPEW, "Preferred aspect ratio: ");
switch ((x[15] & 0xe0) >> 5) {
case 0x00:
printk(BIOS_SPEW, "4:3");
break;
case 0x01:
printk(BIOS_SPEW, "16:9");
break;
case 0x02:
printk(BIOS_SPEW, "16:10");
break;
case 0x03:
printk(BIOS_SPEW, "5:4");
break;
case 0x04:
printk(BIOS_SPEW, "15:9");
break;
default:
printk(BIOS_SPEW, "(broken)");
break;
}
printk(BIOS_SPEW, "\n");
if (x[15] & 0x04)
printk(BIOS_SPEW,
"Supports CVT standard blanking\n");
if (x[15] & 0x10)
printk(BIOS_SPEW,
"Supports CVT reduced blanking\n");
if (x[15] & 0x07)
c->has_valid_range_descriptor = 0;
if (x[16] & 0xf0) {
printk(BIOS_SPEW,
"Supported display scaling:\n");
if (x[16] & 0x80)
printk(BIOS_SPEW,
" Horizontal shrink\n");
if (x[16] & 0x40)
printk(BIOS_SPEW,
" Horizontal stretch\n");
if (x[16] & 0x20)
printk(BIOS_SPEW,
" Vertical shrink\n");
if (x[16] & 0x10)
printk(BIOS_SPEW,
" Vertical stretch\n");
}
if (x[16] & 0x0f)
c->has_valid_range_descriptor = 0;
if (x[17])
printk(BIOS_SPEW,
"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 with 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));
printk(BIOS_SPEW, "ASCII string: %s\n",
result_edid->ascii_string);
return 1;
case 0xFF:
printk(BIOS_SPEW, "Serial number: %s\n",
extract_string(x + 5,
&c->has_valid_string_termination,
EDID_ASCII_STRING_LENGTH));
return 1;
default:
printk(BIOS_SPEW,
"Unknown monitor description type %d\n",
x[3]);
return 0;
}
}
if (c->seen_non_detailed_descriptor && !in_extension)
c->has_valid_descriptor_ordering = 0;
/* 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 sophisticated 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 (ENV_X86)
edid_set_framebuffer_bits_per_pixel(out, 32, 64);
else
edid_set_framebuffer_bits_per_pixel(out, 32, 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;
}
printk(BIOS_SPEW,
"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) {
printk(BIOS_SPEW, "Did detailed timing\n");
c->did_detailed_timing = 1;
*result_edid = *out;
}
return 1;
}
static int
do_checksum(unsigned char *x)
{
int valid = 0;
printk(BIOS_SPEW, "Checksum: 0x%hhx", x[0x7f]);
{
unsigned char sum = 0;
int i;
for (i = 0; i < 128; i++)
sum += x[i];
if (sum) {
printk(BIOS_SPEW, " (should be 0x%hhx)",
(unsigned char)(x[0x7f] - sum));
} else {
valid = 1;
printk(BIOS_SPEW, " (valid)");
}
}
printk(BIOS_SPEW, "\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) {
printk(BIOS_SPEW, "Broken CEA audio block length %d\n", length);
/* XXX non-conformant */
return;
}
for (i = 1; i < length; i += 3) {
format = (x[i] & 0x78) >> 3;
printk(BIOS_SPEW, " %s, max channels %d\n",
audio_format(format), x[i] & 0x07);
printk(BIOS_SPEW,
" 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) {
printk(BIOS_SPEW,
" Supported sample sizes (bits):%s%s%s\n",
(x[2] & 0x04) ? " 24" : "",
(x[2] & 0x02) ? " 20" : "",
(x[2] & 0x01) ? " 16" : "");
} else if (format <= 8) {
printk(BIOS_SPEW,
" 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++)
printk(BIOS_SPEW, " 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;
printk(BIOS_SPEW, " (HDMI)\n");
printk(BIOS_SPEW,
" 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)
printk(BIOS_SPEW, " Supports_AI\n");
if (x[6] & 0x40)
printk(BIOS_SPEW, " DC_48bit\n");
if (x[6] & 0x20)
printk(BIOS_SPEW, " DC_36bit\n");
if (x[6] & 0x10)
printk(BIOS_SPEW, " DC_30bit\n");
if (x[6] & 0x08)
printk(BIOS_SPEW, " DC_Y444\n");
/* two reserved */
if (x[6] & 0x01)
printk(BIOS_SPEW, " DVI_Dual\n");
}
if (length > 6)
printk(BIOS_SPEW, " 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) {
printk(BIOS_SPEW, " Video latency: %d\n", x[9 + b]);
printk(BIOS_SPEW, " Audio latency: %d\n", x[10 + b]);
b += 2;
}
if (x[8] & 0x40) {
printk(BIOS_SPEW,
" Interlaced video latency: %d\n", x[9 + b]);
printk(BIOS_SPEW,
" Interlaced audio latency: %d\n",
x[10 + b]);
b += 2;
}
if (x[8] & 0x20) {
int mask = 0, formats = 0;
int len_xx, len_3d;
printk(BIOS_SPEW, " Extended HDMI video details:\n");
if (x[9 + b] & 0x80)
printk(BIOS_SPEW, " 3D present\n");
if ((x[9 + b] & 0x60) == 0x20) {
printk(BIOS_SPEW,
" All advertised VICs are 3D-capable\n");
formats = 1;
}
if ((x[9 + b] & 0x60) == 0x40) {
printk(BIOS_SPEW,
" 3D-capable-VIC mask present\n");
formats = 1;
mask = 1;
}
switch (x[9 + b] & 0x18) {
case 0x00:
break;
case 0x08:
printk(BIOS_SPEW, " Base EDID image size is aspect ratio\n");
break;
case 0x10:
printk(BIOS_SPEW, " Base EDID image size is in units of 1cm\n");
break;
case 0x18:
printk(BIOS_SPEW, " 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) {
printk(BIOS_SPEW, " 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)
printk(BIOS_SPEW, " Side-by-side 3D supported\n");
if (x[10 + b] & 0x40)
printk(BIOS_SPEW, " Top-and-bottom 3D supported\n");
if (x[10 + b] & 0x01)
printk(BIOS_SPEW, " Frame-packing 3D supported\n");
b += 2;
}
if (mask) {
int i;
printk(BIOS_SPEW,
" 3D VIC indices:");
/* worst bit ordering ever */
for (i = 0; i < 8; i++)
if (x[10 + b] & (1 << i))
printk(BIOS_SPEW,
" %d", i);
for (i = 0; i < 8; i++)
if (x[9 + b] & (1 << i))
printk(BIOS_SPEW,
" %d", i + 8);
printk(BIOS_SPEW, "\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:
printk(BIOS_SPEW, " Audio data block\n");
cea_audio_block(x);
break;
case 0x02:
printk(BIOS_SPEW, " Video data block\n");
cea_video_block(x);
break;
case 0x03:
/* yes really, endianness lols */
oui = (x[3] << 16) + (x[2] << 8) + x[1];
printk(BIOS_SPEW, " Vendor-specific data block, OUI %06x",
oui);
if (oui == 0x000c03)
cea_hdmi_block(out, x);
else
printk(BIOS_SPEW, "\n");
break;
case 0x04:
printk(BIOS_SPEW, " Speaker allocation data block\n");
break;
case 0x05:
printk(BIOS_SPEW, " VESA DTC data block\n");
break;
case 0x07:
printk(BIOS_SPEW, " Extended tag: ");
switch (x[1]) {
case 0x00:
printk(BIOS_SPEW, "video capability data block\n");
break;
case 0x01:
printk(BIOS_SPEW, "vendor-specific video data block\n");
break;
case 0x02:
printk(BIOS_SPEW,
"VESA video display device information data block\n");
break;
case 0x03:
printk(BIOS_SPEW, "VESA video data block\n");
break;
case 0x04:
printk(BIOS_SPEW, "HDMI video data block\n");
break;
case 0x05:
printk(BIOS_SPEW, "Colorimetry data block\n");
break;
case 0x10:
printk(BIOS_SPEW, "CEA miscellaneous audio fields\n");
break;
case 0x11:
printk(BIOS_SPEW, "Vendor-specific audio data block\n");
break;
case 0x12:
printk(BIOS_SPEW, "HDMI audio data block\n");
break;
default:
if (x[1] >= 6 && x[1] <= 15)
printk(BIOS_SPEW,
"Reserved video block (%02x)\n", x[1]);
else if (x[1] >= 19 && x[1] <= 31)
printk(BIOS_SPEW,
"Reserved audio block (%02x)\n", x[1]);
else
printk(BIOS_SPEW, "Unknown (%02x)\n", x[1]);
break;
}
break;
default:
{
int tag = (*x & 0xe0) >> 5;
int length = *x & 0x1f;
printk(BIOS_SPEW,
" 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)
printk(BIOS_SPEW,
"%d 8-byte timing descriptors\n",
(offset - 4) / 8);
else if (version == 3) {
int i;
printk(BIOS_SPEW,
"%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)
printk(BIOS_SPEW,
"Underscans PC formats by default\n");
if (x[3] & 0x40)
printk(BIOS_SPEW,
"Basic audio support\n");
if (x[3] & 0x20)
printk(BIOS_SPEW,
"Supports YCbCr 4:4:4\n");
if (x[3] & 0x10)
printk(BIOS_SPEW,
"Supports YCbCr 4:2:2\n");
printk(BIOS_SPEW,
"%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)
{
printk(BIOS_SPEW, "Extension version: %d\n", x[1]);
}
static int
parse_extension(struct edid *out, unsigned char *x, struct edid_context *c)
{
int conformant_extension = 0;
printk(BIOS_SPEW, "\n");
switch (x[0]) {
case 0x02:
printk(BIOS_SPEW, "CEA extension block\n");
extension_version(out, x);
conformant_extension = parse_cea(out, x, c);
break;
case 0x10:
printk(BIOS_SPEW, "VTB extension block\n");
break;
case 0x40:
printk(BIOS_SPEW, "DI extension block\n");
break;
case 0x50:
printk(BIOS_SPEW, "LS extension block\n");
break;
case 0x60:
printk(BIOS_SPEW, "DPVL extension block\n");
break;
case 0xF0:
printk(BIOS_SPEW, "Block map\n");
break;
case 0xFF:
printk(BIOS_SPEW, "Manufacturer-specific extension block\n");
break;
default:
printk(BIOS_SPEW, "Unknown extension block\n");
break;
}
printk(BIOS_SPEW, "\n");
return conformant_extension;
}
static const struct {
int x, y, refresh;
} established_timings[] = {
/* 0x23 bit 7 - 0 */
{720, 400, 70},
{720, 400, 88},
{640, 480, 60},
{640, 480, 67},
{640, 480, 72},
{640, 480, 75},
{800, 600, 56},
{800, 600, 60},
/* 0x24 bit 7 - 0 */
{800, 600, 72},
{800, 600, 75},
{832, 624, 75},
{1280, 768, 87},
{1024, 768, 60},
{1024, 768, 70},
{1024, 768, 75},
{1280, 1024, 75},
/* 0x25 bit 7*/
{1152, 870, 75},
};
static void print_subsection(const char *name, unsigned char *edid, int start,
int end)
{
int i;
printk(BIOS_SPEW, "%s:", name);
for (i = strlen(name); i < 15; i++)
printk(BIOS_SPEW, " ");
for (i = start; i <= end; i++)
printk(BIOS_SPEW, " %02x", edid[i]);
printk(BIOS_SPEW, "\n");
}
static void dump_breakdown(unsigned char *edid)
{
printk(BIOS_SPEW, "Extracted contents:\n");
print_subsection("header", edid, 0, 7);
print_subsection("serial number", edid, 8, 17);
print_subsection("version", edid, 18, 19);
print_subsection("basic params", edid, 20, 24);
print_subsection("chroma info", edid, 25, 34);
print_subsection("established", edid, 35, 37);
print_subsection("standard", edid, 38, 53);
print_subsection("descriptor 1", edid, 54, 71);
print_subsection("descriptor 2", edid, 72, 89);
print_subsection("descriptor 3", edid, 90, 107);
print_subsection("descriptor 4", edid, 108, 125);
print_subsection("extensions", edid, 126, 126);
print_subsection("checksum", edid, 127, 127);
printk(BIOS_SPEW, "\n");
}
/*
* Lookup table of some well-known modes that can be useful in case the
* auto-detected mode is unsuitable.
* ha = hdisplay; va = vdisplay;
* hbl = htotal - hdisplay; vbl = vtotal - vdisplay;
* hso = hsync_start - hdsiplay; vso = vsync_start - vdisplay;
* hspw = hsync_end - hsync_start; vspw = vsync_end - vsync_start;
*/
static struct edid_mode known_modes[NUM_KNOWN_MODES] = {
[EDID_MODE_640x480_60Hz] = {
.name = "640x480@60Hz", .pixel_clock = 25200, .refresh = 60,
.ha = 640, .hbl = 160, .hso = 16, .hspw = 96,
.va = 480, .vbl = 45, .vso = 10, .vspw = 2,
.phsync = '-', .pvsync = '-' },
[EDID_MODE_720x480_60Hz] = {
.name = "720x480@60Hz", .pixel_clock = 27000, .refresh = 60,
.ha = 720, .hbl = 138, .hso = 16, .hspw = 62,
.va = 480, .vbl = 45, .vso = 9, .vspw = 6,
.phsync = '-', .pvsync = '-' },
[EDID_MODE_1280x720_60Hz] = {
.name = "1280x720@60Hz", .pixel_clock = 74250, .refresh = 60,
.ha = 1280, .hbl = 370, .hso = 110, .hspw = 40,
.va = 720, .vbl = 30, .vso = 5, .vspw = 20,
.phsync = '+', .pvsync = '+' },
[EDID_MODE_1920x1080_60Hz] = {
.name = "1920x1080@60Hz", .pixel_clock = 148500, .refresh = 60,
.ha = 1920, .hbl = 280, .hso = 88, .hspw = 44,
.va = 1080, .vbl = 45, .vso = 4, .vspw = 5,
.phsync = '+', .pvsync = '+' },
};
int set_display_mode(struct edid *edid, enum edid_modes mode)
{
if (mode == EDID_MODE_AUTO)
return 0;
if (edid->mode_is_supported[mode]) {
printk(BIOS_DEBUG, "Forcing mode %s\n", known_modes[mode].name);
edid->mode = known_modes[mode];
return 0;
}
printk(BIOS_ERR, "Requested display mode not supported.\n");
return -1;
}
/*
* Given a raw edid block, decode it into a form
* that other parts of coreboot can use -- mainly
* graphics bringup functions. The raw block is
* required to be 128 bytes long, per the standard,
* but we have no way of checking this minimum length.
* We accept what we are given.
*/
int decode_edid(unsigned char *edid, int size, struct edid *out)
{
int analog, i, j;
struct edid_context c = {
.has_valid_cvt = 1,
.has_valid_dummy_block = 1,
.has_valid_descriptor_ordering = 1,
.has_valid_detailed_blocks = 1,
.has_valid_descriptor_pad = 1,
.has_valid_range_descriptor = 1,
.has_valid_max_dotclock = 1,
.has_valid_string_termination = 1,
.conformant = EDID_CONFORMANT,
};
if (!edid) {
printk(BIOS_ERR, "No EDID found\n");
return EDID_ABSENT;
}
dump_breakdown(edid);
if (memcmp(edid, "\x00\xFF\xFF\xFF\xFF\xFF\xFF\x00", 8)) {
printk(BIOS_ERR, "No header found\n");
return EDID_ABSENT;
}
memset(out, 0, sizeof(*out));
if (manufacturer_name(edid + 0x08, out->manufacturer_name))
c.manufacturer_name_well_formed = 1;
extra_info.model = (unsigned short)(edid[0x0A] + (edid[0x0B] << 8));
extra_info.serial = (unsigned int)(edid[0x0C] + (edid[0x0D] << 8)
+ (edid[0x0E] << 16) + (edid[0x0F] << 24));
printk(BIOS_SPEW, "Manufacturer: %s Model %x Serial Number %u\n",
out->manufacturer_name,
(unsigned short)(edid[0x0A] + (edid[0x0B] << 8)),
(unsigned int)(edid[0x0C] + (edid[0x0D] << 8)
+ (edid[0x0E] << 16) + (edid[0x0F] << 24)));
/* XXX need manufacturer ID table */
if (edid[0x10] < 55 || edid[0x10] == 0xff) {
c.has_valid_week = 1;
if (edid[0x11] > 0x0f) {
if (edid[0x10] == 0xff) {
c.has_valid_year = 1;
printk(BIOS_SPEW,
"Made week %hhd of model year %hhd\n",
edid[0x10], edid[0x11]);
extra_info.week = edid[0x10];
extra_info.year = edid[0x11];
} else {
/* we know it's at least 2013, when this code
* was written
*/
if (edid[0x11] + 90 <= 2013) {
c.has_valid_year = 1;
printk(BIOS_SPEW,
"Made week %hhd of %d\n",
edid[0x10], edid[0x11] + 1990);
extra_info.week = edid[0x10];
extra_info.year = edid[0x11] + 1990;
}
}
}
}
printk(BIOS_SPEW, "EDID version: %hhd.%hhd\n", edid[0x12], edid[0x13]);
extra_info.version[0] = edid[0x12];
extra_info.version[1] = edid[0x13];
if (edid[0x12] == 1) {
if (edid[0x13] > 4) {
printk(BIOS_SPEW,
"Claims > 1.4, assuming 1.4 conformance\n");
edid[0x13] = 4;
}
switch (edid[0x13]) {
case 4:
c.claims_one_point_four = 1;
/* fall through */
case 3:
c.claims_one_point_three = 1;
/* fall through */
case 2:
c.claims_one_point_two = 1;
/* fall through */
default:
c.claims_one_point_oh = 1;
}
}
/* display section */
if (edid[0x14] & 0x80) {
int conformance_mask;
analog = 0;
printk(BIOS_SPEW, "Digital display\n");
if (c.claims_one_point_four) {
conformance_mask = 0;
if ((edid[0x14] & 0x70) == 0x00)
printk(BIOS_SPEW, "Color depth is undefined\n");
else if ((edid[0x14] & 0x70) == 0x70)
c.nonconformant_digital_display = 1;
else
printk(BIOS_SPEW,
"%d bits per primary color channel\n",
((edid[0x14] & 0x70) >> 3) + 4);
out->panel_bits_per_color = ((edid[0x14] & 0x70) >> 3)
+ 4;
out->panel_bits_per_pixel = 3*out->panel_bits_per_color;
switch (edid[0x14] & 0x0f) {
case 0x00:
printk(BIOS_SPEW,
"Digital interface is not defined\n");
break;
case 0x01:
printk(BIOS_SPEW, "DVI interface\n");
break;
case 0x02:
printk(BIOS_SPEW, "HDMI-a interface\n");
break;
case 0x03:
printk(BIOS_SPEW, "HDMI-b interface\n");
break;
case 0x04:
printk(BIOS_SPEW, "MDDI interface\n");
break;
case 0x05:
printk(BIOS_SPEW, "DisplayPort interface\n");
break;
default:
c.nonconformant_digital_display = 1;
break;
}
extra_info.type = edid[0x14] & 0x0f;
} else if (c.claims_one_point_two) {
conformance_mask = 0x7E;
if (edid[0x14] & 0x01)
printk(BIOS_SPEW, "DFP 1.x compatible TMDS\n");
} else
conformance_mask = 0x7F;
if (!c.nonconformant_digital_display)
c.nonconformant_digital_display = edid[0x14]
& conformance_mask;
extra_info.nonconformant = c.nonconformant_digital_display;
} else {
analog = 1;
int voltage = (edid[0x14] & 0x60) >> 5;
int sync = (edid[0x14] & 0x0F);
extra_info.voltage = voltage;
extra_info.sync = sync;
printk(BIOS_SPEW, "Analog display, Input voltage level: %s V\n",
voltage == 3 ? "0.7/0.7" :
voltage == 2 ? "1.0/0.4" :
voltage == 1 ? "0.714/0.286" :
"0.7/0.3");
if (c.claims_one_point_four) {
if (edid[0x14] & 0x10)
printk(BIOS_SPEW,
"Blank-to-black setup/pedestal\n");
else
printk(BIOS_SPEW,
"Blank level equals black level\n");
} else if (edid[0x14] & 0x10) {
/*
* XXX this is just the X text. 1.3 says "if set,
* display expects a blank-to-black setup or pedestal
* per appropriate Signal Level Standard". Whatever
* _that_ means.
*/
printk(BIOS_SPEW, "Configurable signal levels\n");
}
printk(BIOS_SPEW, "Sync: %s%s%s%s\n",
sync & 0x08 ? "Separate " : "",
sync & 0x04 ? "Composite " : "",
sync & 0x02 ? "SyncOnGreen " : "",
sync & 0x01 ? "Serration " : "");
}
if (edid[0x15] && edid[0x16]) {
printk(BIOS_SPEW, "Maximum image size: %d cm x %d cm\n",
edid[0x15], edid[0x16]);
} else if (c.claims_one_point_four && (edid[0x15] || edid[0x16])) {
if (edid[0x15]) { /* edid[0x15] != 0 && edid[0x16] == 0 */
unsigned int ratio = 100000/(edid[0x15] + 99);
printk(BIOS_SPEW,
"Aspect ratio is %u.%03u (landscape)\n",
ratio / 1000, ratio % 1000);
} else { /* edid[0x15] == 0 && edid[0x16] != 0 */
unsigned int ratio = 100000/(edid[0x16] + 99);
printk(BIOS_SPEW,
"Aspect ratio is %u.%03u (portrait)\n",
ratio / 1000, ratio % 1000);
}
} else {
/* Either or both can be zero for 1.3 and before */
printk(BIOS_SPEW, "Image size is variable\n");
}
if (edid[0x17] == 0xff) {
if (c.claims_one_point_four)
printk(BIOS_SPEW,
"Gamma is defined in an extension block\n");
else
/* XXX Technically 1.3 doesn't say this... */
printk(BIOS_SPEW, "Gamma: 1.0\n");
} else
printk(BIOS_SPEW, "Gamma: %d%%\n", ((edid[0x17] + 100)));
printk(BIOS_SPEW, "Check DPMS levels\n");
if (edid[0x18] & 0xE0) {
printk(BIOS_SPEW, "DPMS levels:");
if (edid[0x18] & 0x80)
printk(BIOS_SPEW, " Standby");
if (edid[0x18] & 0x40)
printk(BIOS_SPEW, " Suspend");
if (edid[0x18] & 0x20)
printk(BIOS_SPEW, " Off");
printk(BIOS_SPEW, "\n");
}
/* FIXME: this is from 1.4 spec, check earlier */
if (analog) {
switch (edid[0x18] & 0x18) {
case 0x00:
printk(BIOS_SPEW, "Monochrome or grayscale display\n");
break;
case 0x08:
printk(BIOS_SPEW, "RGB color display\n");
break;
case 0x10:
printk(BIOS_SPEW, "Non-RGB color display\n");
break;
case 0x18:
printk(BIOS_SPEW, "Undefined display color type\n");
break;
}
} else {
printk(BIOS_SPEW, "Supported color formats: RGB 4:4:4");
if (edid[0x18] & 0x10)
printk(BIOS_SPEW, ", YCrCb 4:4:4");
if (edid[0x18] & 0x08)
printk(BIOS_SPEW, ", YCrCb 4:2:2");
printk(BIOS_SPEW, "\n");
}
if (edid[0x18] & 0x04)
printk(BIOS_SPEW,
"Default (sRGB) color space is primary color space\n");
if (edid[0x18] & 0x02) {
printk(BIOS_SPEW,
"First detailed timing is preferred timing\n");
c.has_preferred_timing = 1;
}
if (edid[0x18] & 0x01)
printk(BIOS_SPEW,
"Supports GTF timings within operating range\n");
/* XXX color section */
printk(BIOS_SPEW, "Established timings supported:\n");
/* it's not yet clear we want all this stuff in the edid struct.
* Let's wait.
*/
for (i = 0; i < 17; i++) {
if (edid[0x23 + i / 8] & (1 << (7 - i % 8))) {
printk(BIOS_SPEW, " %dx%d@%dHz\n",
established_timings[i].x,
established_timings[i].y,
established_timings[i].refresh);
for (j = 0; j < NUM_KNOWN_MODES; j++) {
if (known_modes[j].ha ==
established_timings[i].x
&& known_modes[j].va ==
established_timings[i].y
&& known_modes[j].refresh ==
established_timings[i].refresh)
out->mode_is_supported[j] = 1;
}
}
}
printk(BIOS_SPEW, "Standard timings supported:\n");
for (i = 0; i < 8; i++) {
uint8_t b1 = edid[0x26 + i * 2], b2 = edid[0x26 + i * 2 + 1];
unsigned int x, y = 0, refresh;
if (b1 == 0x01 && b2 == 0x01)
continue;
if (b1 == 0) {
printk(BIOS_SPEW,
"non-conformant standard timing (0 horiz)\n");
continue;
}
x = (b1 + 31) * 8;
switch ((b2 >> 6) & 0x3) {
case 0x00:
if (c.claims_one_point_three)
y = x * 10 / 16;
else
y = x;
break;
case 0x01:
y = x * 3 / 4;
break;
case 0x02:
y = x * 4 / 5;
break;
case 0x03:
y = x * 9 / 16;
break;
}
refresh = 60 + (b2 & 0x3f);
printk(BIOS_SPEW, " %dx%d@%dHz\n", x, y, refresh);
for (j = 0; j < NUM_KNOWN_MODES; j++) {
if (known_modes[j].ha == x && known_modes[j].va == y &&
known_modes[j].refresh == refresh)
out->mode_is_supported[j] = 1;
}
}
/* detailed timings */
printk(BIOS_SPEW, "Detailed timings\n");
for (i = 0; i < 4; i++) {
c.has_valid_detailed_blocks &= detailed_block(
out, edid + 0x36 + i * 18, 0, &c);
if (i == 0 && c.has_preferred_timing
&& !c.did_detailed_timing) {
/* not really accurate... */
c.has_preferred_timing = 0;
}
}
/* check this, 1.4 verification guide says otherwise */
if (edid[0x7e]) {
printk(BIOS_SPEW, "Has %d extension blocks\n", edid[0x7e]);
/* 2 is impossible because of the block map */
if (edid[0x7e] != 2)
c.has_valid_extension_count = 1;
} else {
c.has_valid_extension_count = 1;
}
printk(BIOS_SPEW, "Checksum\n");
c.has_valid_checksum = do_checksum(edid);
/* EDID v2.0 has a larger blob (256 bytes) and may have some problem in
* the extension parsing loop below. Since v2.0 was quickly deprecated
* by v1.3 and we are unlikely to use any EDID 2.0 panels, we ignore
* that case now and can fix it when we need to use a real 2.0 panel.
*/
for (i = 128; i < size; i += 128)
c.nonconformant_extension +=
parse_extension(out, &edid[i], &c);
if (c.claims_one_point_four) {
if (c.nonconformant_digital_display ||
!c.has_valid_string_termination ||
!c.has_valid_descriptor_pad ||
!c.has_preferred_timing) {
c.conformant = EDID_NOT_CONFORMANT;
printk(BIOS_ERR,
"EDID block does NOT conform to EDID 1.4!\n");
}
if (c.nonconformant_digital_display)
printk(BIOS_ERR,
"\tDigital display field contains garbage: %x\n",
c.nonconformant_digital_display);
if (!c.has_valid_string_termination)
printk(BIOS_ERR,
"\tDetailed block string not properly terminated\n");
if (!c.has_valid_descriptor_pad)
printk(BIOS_ERR,
"\tInvalid descriptor block padding\n");
if (!c.has_preferred_timing)
printk(BIOS_ERR, "\tMissing preferred timing\n");
} else if (c.claims_one_point_three) {
if (c.nonconformant_digital_display ||
!c.has_valid_string_termination ||
!c.has_valid_descriptor_pad ||
!c.has_preferred_timing) {
c.conformant = EDID_NOT_CONFORMANT;
}
/**
* According to E-EDID (EDIDv1.3), has_name_descriptor and
* has_range_descriptor are both required. These fields are
* optional in v1.4. However some v1.3 panels (Ex, B133XTN01.3)
* don't have them. As a workaround, we only print warning
* messages.
*/
if (c.conformant == EDID_NOT_CONFORMANT)
printk(BIOS_ERR,
"EDID block does NOT conform to EDID 1.3!\n");
else if (!c.has_name_descriptor || !c.has_range_descriptor)
printk(BIOS_WARNING, "EDID block does NOT "
"fully conform to EDID 1.3.\n");
if (c.nonconformant_digital_display)
printk(BIOS_ERR,
"\tDigital display field contains garbage: %x\n",
c.nonconformant_digital_display);
if (!c.has_name_descriptor)
printk(BIOS_ERR, "\tMissing name descriptor\n");
if (!c.has_preferred_timing)
printk(BIOS_ERR, "\tMissing preferred timing\n");
if (!c.has_range_descriptor)
printk(BIOS_ERR, "\tMissing monitor ranges\n");
/* Might be more than just 1.3 */
if (!c.has_valid_descriptor_pad)
printk(BIOS_ERR,
"\tInvalid descriptor block padding\n");
if (!c.has_valid_string_termination) /* Likewise */
printk(BIOS_ERR,
"\tDetailed block string not properly terminated\n");
} else if (c.claims_one_point_two) {
if (c.nonconformant_digital_display ||
!c.has_valid_string_termination) {
c.conformant = EDID_NOT_CONFORMANT;
printk(BIOS_ERR,
"EDID block does NOT conform to EDID 1.2!\n");
}
if (c.nonconformant_digital_display)
printk(BIOS_ERR,
"\tDigital display field contains garbage: %x\n",
c.nonconformant_digital_display);
if (!c.has_valid_string_termination)
printk(BIOS_ERR,
"\tDetailed block string not properly terminated\n");
} else if (c.claims_one_point_oh) {
if (c.seen_non_detailed_descriptor) {
c.conformant = EDID_NOT_CONFORMANT;
printk(BIOS_ERR,
"EDID block does NOT conform to EDID 1.0!\n");
}
if (c.seen_non_detailed_descriptor)
printk(BIOS_ERR,
"\tHas descriptor blocks other than detailed timings\n");
}
if (c.nonconformant_extension ||
!c.has_valid_checksum ||
!c.has_valid_cvt ||
!c.has_valid_year ||
!c.has_valid_week ||
!c.has_valid_detailed_blocks ||
!c.has_valid_dummy_block ||
!c.has_valid_extension_count ||
!c.has_valid_descriptor_ordering ||
!c.has_valid_range_descriptor ||
!c.manufacturer_name_well_formed) {
c.conformant = EDID_NOT_CONFORMANT;
printk(BIOS_ERR, "EDID block does not conform at all!\n");
if (c.nonconformant_extension)
printk(BIOS_ERR,
"\tHas %d nonconformant extension block(s)\n",
c.nonconformant_extension);
if (!c.has_valid_checksum)
printk(BIOS_ERR, "\tBlock has broken checksum\n");
if (!c.has_valid_cvt)
printk(BIOS_ERR, "\tBroken 3-byte CVT blocks\n");
if (!c.has_valid_year)
printk(BIOS_ERR, "\tBad year of manufacture\n");
if (!c.has_valid_week)
printk(BIOS_ERR, "\tBad week of manufacture\n");
if (!c.has_valid_detailed_blocks)
printk(BIOS_ERR,
"\tDetailed blocks filled with garbage\n");
if (!c.has_valid_dummy_block)
printk(BIOS_ERR, "\tDummy block filled with garbage\n");
if (!c.has_valid_extension_count)
printk(BIOS_ERR,
"\tImpossible extension block count\n");
if (!c.manufacturer_name_well_formed)
printk(BIOS_ERR,
"\tManufacturer name field contains garbage\n");
if (!c.has_valid_descriptor_ordering)
printk(BIOS_ERR,
"\tInvalid detailed timing descriptor ordering\n");
if (!c.has_valid_range_descriptor)
printk(BIOS_ERR,
"\tRange descriptor contains garbage\n");
if (!c.has_valid_max_dotclock)
printk(BIOS_ERR,
"\tEDID 1.4 block does not set max dotclock\n");
}
if (c.warning_excessive_dotclock_correction)
printk(BIOS_ERR,
"Warning: CVT block corrects dotclock by more than 9.75MHz\n");
if (c.warning_zero_preferred_refresh)
printk(BIOS_ERR,
"Warning: CVT block does not set preferred refresh rate\n");
return c.conformant;
}
/*
* Notes on panel extensions: (TODO, implement me in the code)
*
* EPI: http://www.epi-standard.org/fileadmin/spec/EPI_Specification1.0.pdf
* at offset 0x6c (fourth detailed block): (all other bits reserved)
* 0x6c: 00 00 00 0e 00
* 0x71: bit 6-5: data color mapping (00 conventional/fpdi/vesa, 01 openldi)
* bit 4-3: pixels per clock (00 1, 01 2, 10 4, 11 reserved)
* bit 2-0: bits per pixel (000 18, 001 24, 010 30, else reserved)
* 0x72: bit 5: FPSCLK polarity (0 normal 1 inverted)
* bit 4: DE polarity (0 high active 1 low active)
* bit 3-0: interface (0000 LVDS TFT
* 0001 mono STN 4/8bit
* 0010 color STN 8/16 bit
* 0011 18 bit tft
* 0100 24 bit tft
* 0101 tmds
* else reserved)
* 0x73: bit 1: horizontal display mode (0 normal 1 right/left reverse)
* bit 0: vertical display mode (0 normal 1 up/down reverse)
* 0x74: bit 7-4: total poweroff seq delay (0000 vga controller default
* else time in 10ms (10ms to 150ms))
* bit 3-0: total poweron seq delay (as above)
* 0x75: contrast power on/off seq delay, same as 0x74
* 0x76: bit 7: backlight control enable (1 means this field is valid)
* bit 6: backlight enabled at boot (0 on 1 off)
* bit 5-0: backlight brightness control steps (0..63)
* 0x77: bit 7: contrast control, same bit pattern as 0x76 except bit 6 resvd
* 0x78 - 0x7c: reserved
* 0x7d: bit 7-4: EPI descriptor major version (1)
* bit 3-0: EPI descriptor minor version (0)
*
* ----
*
* SPWG: http://www.spwg.org/spwg_spec_version3.8_3-14-2007.pdf
*
* Since these are "dummy" blocks, terminate with 0a 20 20 20 ... as usual
*
* detailed descriptor 3:
* 0x5a - 0x5e: 00 00 00 fe 00
* 0x5f - 0x63: PC maker part number
* 0x64: LCD supplier revision #
* 0x65 - 0x6b: manufacturer part number
*
* detailed descriptor 4:
* 0x6c - 0x70: 00 00 00 fe 00
* 0x71 - 0x78: smbus nits values (whut)
* 0x79: number of lvds channels (1 or 2)
* 0x7A: panel self test (1 if present)
* and then dummy terminator
*
* SPWG also says something strange about the LSB of detailed descriptor 1:
* "LSB is set to "1" if panel is DE-timing only. H/V can be ignored."
*/
/* Set the framebuffer bits-per-pixel, recalculating all dependent values. */
void edid_set_framebuffer_bits_per_pixel(struct edid *edid, int fb_bpp,
int row_byte_alignment)
{
/* Caller should pass a supported value, everything else is BUG(). */
assert(fb_bpp == 32 || fb_bpp == 24 || fb_bpp == 16);
row_byte_alignment = MAX(row_byte_alignment, 1);
edid->framebuffer_bits_per_pixel = fb_bpp;
edid->bytes_per_line = ALIGN_UP(edid->mode.ha *
DIV_ROUND_UP(fb_bpp, 8), row_byte_alignment);
edid->x_resolution = edid->bytes_per_line / (fb_bpp / 8);
edid->y_resolution = edid->mode.va;
}
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