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coreboot-kgpe-d16/src/lib/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 <stddef.h>
#include <console/console.h>
#include <arch/io.h>
#include <arch/byteorder.h>
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include <edid.h>
#include <boot/coreboot_tables.h>
#include <vbe.h>
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 name_descriptor_terminated = 0;
static int has_range_descriptor = 0;
static int has_preferred_timing = 0;
static int has_valid_checksum = 0;
static int has_valid_cvt = 1;
static int has_valid_dummy_block = 1;
static int has_valid_week = 0;
static int has_valid_year = 0;
static int has_valid_detailed_blocks = 0;
static int has_valid_extension_count = 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 manufacturer_name_well_formed = 0;
static int seen_non_detailed_descriptor = 0;
static int warning_excessive_dotclock_correction = 0;
static int warning_zero_preferred_refresh = 0;
static int conformant = 1;
static int vbe_valid;
static struct lb_framebuffer edid_fb;
static char *manufacturer_name(struct edid *out, unsigned char *x)
{
out->manuf_name[0] = ((x[0] & 0x7C) >> 2) + '@';
out->manuf_name[1] = ((x[0] & 0x03) << 3) + ((x[1] & 0xE0) >> 5) + '@';
out->manuf_name[2] = (x[1] & 0x1F) + '@';
out->manuf_name[3] = 0;
if (isupper(out->manuf_name[0]) &&
isupper(out->manuf_name[1]) &&
isupper(out->manuf_name[2]))
manufacturer_name_well_formed = 1;
return out->manuf_name;
}
static int
detailed_cvt_descriptor(struct edid *out, unsigned char *x, int first)
{
const unsigned char empty[3] = { 0, 0, 0 };
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;
}
static int isalnum(char x)
{
if (x >= 'a' && x <= 'z')
return 1;
if (x >= 'A' && x <= 'Z')
return 1;
if (x >= '0' && x <= '9')
return 1;
return 0;
}
/* extract a string from a detailed subblock, checking for termination */
static char *
extract_string(unsigned char *x, int *valid_termination, int len)
{
static char ret[128];
int i, seen_newline = 0;
memset(ret, 0, sizeof(ret));
for (i = 0; i < len; i++) {
if (isalnum(x[i])) {
ret[i] = x[i];
} else if (!seen_newline) {
if (x[i] == 0x0a) {
seen_newline = 1;
} else {
*valid_termination = 0;
return ret;
}
} else {
if (x[i] != 0x20) {
*valid_termination = 0;
return ret;
}
}
}
return ret;
}
/* 1 means valid data */
static int
detailed_block(struct edid *out, unsigned char *x, int in_extension)
{
static unsigned char name[53];
int i;
#if 1
printk(BIOS_SPEW, "Hex of detail: ");
for (i = 0; i < 18; i++)
printk(BIOS_SPEW, "%02x", x[i]);
printk(BIOS_SPEW, "\n");
#endif
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]);
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]);
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/
*/
printk(BIOS_SPEW, "Manufacturer-specified data, tag %d\n", x[3]);
return 0;
}
switch (x[3]) {
case 0x10:
printk(BIOS_SPEW, "Dummy block\n");
for (i = 5; i < 18; i++)
if (x[i] != 0x00)
has_valid_dummy_block = 0;
return 0;
case 0xF7:
/* TODO */
printk(BIOS_SPEW, "Established timings III\n");
return 0;
case 0xF8:
{
int valid_cvt = 1; /* just this block */
printk(BIOS_SPEW, "CVT 3-byte code descriptor:\n");
if (x[5] != 0x01) {
has_valid_cvt = 0;
return 0;
}
for (i = 0; i < 4; i++)
valid_cvt &= detailed_cvt_descriptor(out, x + 6 + (i * 3), (i == 0));
has_valid_cvt &= valid_cvt;
return 0;
}
case 0xF9:
/* TODO */
printk(BIOS_SPEW, "Color management data\n");
return 0;
case 0xFA:
/* TODO */
printk(BIOS_SPEW, "More standard timings\n");
return 0;
case 0xFB:
/* TODO */
printk(BIOS_SPEW, "Color point\n");
return 0;
case 0xFC:
/* XXX should check for spaces after the \n */
/* XXX check: terminated with 0x0A, padded with 0x20 */
has_name_descriptor = 1;
if (strchr((char *)name, '\n')) return 0;
/* avoid strncat
strncat((char *)name, (char *)x + 5, 13);
*/
if (strchr((char *)name, '\n') || strchr((char *)x+5, '\n')) {
name_descriptor_terminated = 1;
/* later.
printk(BIOS_SPEW, "Monitor name: %s\n",
extract_string(name, &has_valid_string_termination,
strlen((char *)name)));
*/
}
return 0;
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;
out->range_class = "";
/*
* 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;
}
/*
* despite the values, this is not a bitfield.
*/
switch (x[10]) {
case 0x00: /* default gtf */
out->range_class = "GTF";
break;
case 0x01: /* range limits only */
out->range_class = "bare limits";
if (!claims_one_point_four)
has_valid_range_descriptor = 0;
break;
case 0x02: /* secondary gtf curve */
out->range_class = "GTF with icing";
break;
case 0x04: /* cvt */
out->range_class = "CVT";
is_cvt = 1;
if (!claims_one_point_four)
has_valid_range_descriptor = 0;
break;
default: /* invalid */
has_valid_range_descriptor = 0;
out->range_class = "invalid";
break;
}
if (x[5] + v_min_offset > x[6] + v_max_offset)
has_valid_range_descriptor = 0;
if (x[7] + h_min_offset > x[8] + h_max_offset)
has_valid_range_descriptor = 0;
printk(BIOS_SPEW, "Monitor ranges (%s): %d-%dHz V, %d-%dkHz H",
out->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 (claims_one_point_four)
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: %.2fMHz\n",
(x[9] * 10) - (raw_offset * 0.25));
if (raw_offset >= 40)
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)
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)
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)
has_valid_range_descriptor = 0;
if (x[17])
printk(BIOS_SPEW, "Preferred vertical refresh: %d Hz\n", x[17]);
else
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 0;
}
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/
*/
printk(BIOS_SPEW, "ASCII string: %s\n",
extract_string(x + 5, &has_valid_string_termination, 13));
return 0;
case 0xFF:
printk(BIOS_SPEW, "Serial number: %s\n",
extract_string(x + 5, &has_valid_string_termination, 13));
return 0;
default:
printk(BIOS_SPEW, "Unknown monitor description type %d\n", x[3]);
return 0;
}
}
if (seen_non_detailed_descriptor && !in_extension) {
has_valid_descriptor_ordering = 0;
}
if (! did_detailed_timing){
/* Edid contains pixel clock in terms of 10KHz */
out->pixel_clock = (x[0] + (x[1] << 8)) * 10;
out->x_mm = (x[12] + ((x[14] & 0xF0) << 4));
out->y_mm = (x[13] + ((x[14] & 0x0F) << 8));
out->ha = (x[2] + ((x[4] & 0xF0) << 4));
out->hbl = (x[3] + ((x[4] & 0x0F) << 8));
out->hso = (x[8] + ((x[11] & 0xC0) << 2));
out->hspw = (x[9] + ((x[11] & 0x30) << 4));
out->hborder = x[15];
out->va = (x[5] + ((x[7] & 0xF0) << 4));
out->vbl = (x[6] + ((x[7] & 0x0F) << 8));
out->vso = ((x[10] >> 4) + ((x[11] & 0x0C) << 2));
out->vspw = ((x[10] & 0x0F) + ((x[11] & 0x03) << 4));
out->vborder = x[16];
/* set up some reasonable defaults for payloads.
* We observe that most modern chipsets we work with
* tend to support rgb888 without regard to the
* panel bits per color or other settings. The rgb888
* is a convenient layout for software because
* it avoids the messy bit stuffing of rgb565 or rgb444.
* It makes a reasonable trade of memory for speed.
* So, set up the default for
* 32 bits per pixel
* rgb888 (i.e. no alpha, but pixels on 32-bit boundaries)
* The mainboard can modify these if needed, though
* we have yet to see a case where that will happen.
*/
out->bpp = 32;
out->x_resolution = ALIGN(out->ha * ((out->bpp + 7) / 8),64) / (out->bpp/8);
out->y_resolution = out->va;
out->bytes_per_line = ALIGN(out->ha * ((out->bpp + 7) / 8),64);
printk(BIOS_SPEW, "Did detailed timing\n");
}
did_detailed_timing = 1;
switch ((x[17] & 0x18) >> 3) {
case 0x00:
out->syncmethod = " analog composite";
break;
case 0x01:
out->syncmethod = " bipolar analog composite";
break;
case 0x02:
out->syncmethod = " digital composite";
break;
case 0x03:
out->syncmethod = "";
break;
}
out->pvsync = (x[17] & (1 << 2)) ? '+' : '-';
out->phsync = (x[17] & (1 << 1)) ? '+' : '-';
switch (x[17] & 0x61) {
case 0x20:
out->stereo = "field sequential L/R";
break;
case 0x40:
out->stereo = "field sequential R/L";
break;
case 0x21:
out->stereo = "interleaved right even";
break;
case 0x41:
out->stereo = "interleaved left even";
break;
case 0x60:
out->stereo = "four way interleaved";
break;
case 0x61:
out->stereo = "side by side interleaved";
break;
default:
out->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->pixel_clock,
out->x_mm,
out->y_mm,
out->ha, out->ha + out->hso, out->ha + out->hso + out->hspw,
out->ha + out->hbl, out->hborder,
out->va, out->va + out->vso, out->va + out->vso + out->vspw,
out->va + out->vbl, out->vborder,
out->phsync, out->pvsync,
out->syncmethod, x[17] & 0x80 ?" interlaced" : "",
out->stereo
);
return 1;
}
static int
do_checksum(unsigned char *x)
{
printk(BIOS_SPEW, "Checksum: 0x%hx", 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%hx)", (unsigned char)(x[0x7f] - sum));
has_valid_checksum = 0;
} else {
has_valid_checksum = 1;
printk(BIOS_SPEW, " (valid)");
}
}
printk(BIOS_SPEW, "\n");
return has_valid_checksum;
}
/* 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;
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)
*/
}
}
}
}
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)
{
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);
if (offset - 4 > 0)
/* do stuff */ ;
} 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);
} while (0);
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)
{
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);
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");
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");
}
/*
* Given a raw edid bloc, 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;
dump_breakdown(edid);
if (!edid || memcmp(edid, "\x00\xFF\xFF\xFF\xFF\xFF\xFF\x00", 8)) {
printk(BIOS_SPEW, "No header found\n");
return 1;
}
memset(out, 0, sizeof(*out));
manufacturer_name(out, edid + 0x08);
out->model = (unsigned short)(edid[0x0A] + (edid[0x0B] << 8));
out->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->manuf_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) {
has_valid_week = 1;
if (edid[0x11] > 0x0f) {
if (edid[0x10] == 0xff) {
has_valid_year = 1;
printk(BIOS_SPEW, "Made week %hd of model year %hd\n", edid[0x10],
edid[0x11]);
out->week = edid[0x10];
out->year = edid[0x11];
} else {
/* we know it's at least 2013, when this code was written */
if (edid[0x11] + 90 <= 2013) {
has_valid_year = 1;
printk(BIOS_SPEW, "Made week %hd of %hd\n",
edid[0x10], edid[0x11] + 1990);
out->week = edid[0x10];
out->year = edid[0x11] + 1990;
}
}
}
}
printk(BIOS_SPEW, "EDID version: %hd.%hd\n", edid[0x12], edid[0x13]);
out->version[0] = edid[0x12];
out->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:
claims_one_point_four = 1;
case 3:
claims_one_point_three = 1;
case 2:
claims_one_point_two = 1;
default:
break;
}
claims_one_point_oh = 1;
}
/* display section */
if (edid[0x14] & 0x80) {
int conformance_mask;
analog = 0;
printk(BIOS_SPEW, "Digital display\n");
if (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)
nonconformant_digital_display = 1;
else
printk(BIOS_SPEW, "%d bits per primary color channel\n",
((edid[0x14] & 0x70) >> 3) + 4);
out->bpp = ((edid[0x14] & 0x70) >> 3) + 4;
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:
nonconformant_digital_display = 1;
}
out->type = edid[0x14] & 0x0f;
} else if (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 (!nonconformant_digital_display)
nonconformant_digital_display = edid[0x14] & conformance_mask;
out->nonconformant = nonconformant_digital_display;
} else {
analog = 1;
int voltage = (edid[0x14] & 0x60) >> 5;
int sync = (edid[0x14] & 0x0F);
out->voltage = voltage;
out->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 (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]);
out->xsize_cm = edid[0x15];
out->ysize_cm = edid[0x16];
} else if (claims_one_point_four && (edid[0x15] || edid[0x16])) {
if (edid[0x15]) {
printk(BIOS_SPEW, "Aspect ratio is %f (landscape)\n",
100.0/(edid[0x16] + 99));
/* truncated to integer %. We try to avoid floating point */
out->aspect_landscape = 10000 /(edid[0x16] + 99);
} else {
printk(BIOS_SPEW, "Aspect ratio is %f (portrait)\n",
100.0/(edid[0x15] + 99));
out->aspect_portrait = 10000 /(edid[0x16] + 99);
}
} 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 (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");
}
} 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");
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);
}
}
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 (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);
}
/* detailed timings */
printk(BIOS_SPEW, "Detailed timings\n");
has_valid_detailed_blocks = detailed_block(out, edid + 0x36, 0);
if (has_preferred_timing && !did_detailed_timing)
has_preferred_timing = 0; /* not really accurate... */
has_valid_detailed_blocks &= detailed_block(out, edid + 0x48, 0);
has_valid_detailed_blocks &= detailed_block(out, edid + 0x5A, 0);
has_valid_detailed_blocks &= detailed_block(out, edid + 0x6C, 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)
has_valid_extension_count = 1;
} else {
has_valid_extension_count = 1;
}
printk(BIOS_SPEW, "Checksum\n");
vbe_valid = do_checksum(edid);
for(i = 0; i < size; i += 128)
nonconformant_extension = parse_extension(out, &edid[i]);
/*
x = edid;
for (edid_lines /= 8; edid_lines > 1; edid_lines--) {
x += 128;
nonconformant_extension += parse_extension(x);
}
*/
if (claims_one_point_three) {
if (nonconformant_digital_display ||
!has_valid_string_termination ||
!has_valid_descriptor_pad ||
!has_name_descriptor ||
!name_descriptor_terminated ||
!has_preferred_timing ||
!has_range_descriptor)
conformant = 0;
if (!conformant)
printk(BIOS_ERR, "EDID block does NOT conform to EDID 1.3!\n");
if (nonconformant_digital_display)
printk(BIOS_ERR, "\tDigital display field contains garbage: %x\n",
nonconformant_digital_display);
if (!has_name_descriptor)
printk(BIOS_ERR, "\tMissing name descriptor\n");
else if (!name_descriptor_terminated)
printk(BIOS_ERR, "\tName descriptor not terminated with a newline\n");
if (!has_preferred_timing)
printk(BIOS_ERR, "\tMissing preferred timing\n");
if (!has_range_descriptor)
printk(BIOS_ERR, "\tMissing monitor ranges\n");
if (!has_valid_descriptor_pad) /* Might be more than just 1.3 */
printk(BIOS_ERR, "\tInvalid descriptor block padding\n");
if (!has_valid_string_termination) /* Likewise */
printk(BIOS_ERR, "\tDetailed block string not properly terminated\n");
} else if (claims_one_point_two) {
if (nonconformant_digital_display ||
(has_name_descriptor && !name_descriptor_terminated))
conformant = 0;
if (!conformant)
printk(BIOS_ERR, "EDID block does NOT conform to EDID 1.2!\n");
if (nonconformant_digital_display)
printk(BIOS_ERR, "\tDigital display field contains garbage: %x\n",
nonconformant_digital_display);
if (has_name_descriptor && !name_descriptor_terminated)
printk(BIOS_ERR, "\tName descriptor not terminated with a newline\n");
} else if (claims_one_point_oh) {
if (seen_non_detailed_descriptor)
conformant = 0;
if (!conformant)
printk(BIOS_ERR, "EDID block does NOT conform to EDID 1.0!\n");
if (seen_non_detailed_descriptor)
printk(BIOS_ERR, "\tHas descriptor blocks other than detailed timings\n");
}
if (nonconformant_extension ||
!has_valid_checksum ||
!has_valid_cvt ||
!has_valid_year ||
!has_valid_week ||
!has_valid_detailed_blocks ||
!has_valid_dummy_block ||
!has_valid_extension_count ||
!has_valid_descriptor_ordering ||
!has_valid_range_descriptor ||
!manufacturer_name_well_formed) {
conformant = 0;
printk(BIOS_ERR, "EDID block does not conform at all!\n");
if (nonconformant_extension)
printk(BIOS_ERR, "\tHas %d nonconformant extension block(s)\n",
nonconformant_extension);
if (!has_valid_checksum)
printk(BIOS_ERR, "\tBlock has broken checksum\n");
if (!has_valid_cvt)
printk(BIOS_ERR, "\tBroken 3-byte CVT blocks\n");
if (!has_valid_year)
printk(BIOS_ERR, "\tBad year of manufacture\n");
if (!has_valid_week)
printk(BIOS_ERR, "\tBad week of manufacture\n");
if (!has_valid_detailed_blocks)
printk(BIOS_ERR, "\tDetailed blocks filled with garbage\n");
if (!has_valid_dummy_block)
printk(BIOS_ERR, "\tDummy block filled with garbage\n");
if (!has_valid_extension_count)
printk(BIOS_ERR, "\tImpossible extension block count\n");
if (!manufacturer_name_well_formed)
printk(BIOS_ERR, "\tManufacturer name field contains garbage\n");
if (!has_valid_descriptor_ordering)
printk(BIOS_ERR, "\tInvalid detailed timing descriptor ordering\n");
if (!has_valid_range_descriptor)
printk(BIOS_ERR, "\tRange descriptor contains garbage\n");
if (!has_valid_max_dotclock)
printk(BIOS_ERR, "\tEDID 1.4 block does not set max dotclock\n");
}
if (warning_excessive_dotclock_correction)
printk(BIOS_ERR,
"Warning: CVT block corrects dotclock by more than 9.75MHz\n");
if (warning_zero_preferred_refresh)
printk(BIOS_ERR,
"Warning: CVT block does not set preferred refresh rate\n");
return !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."
*/
/*
* Take an edid, and create a framebuffer. Set vbe_valid to 1.
*/
void set_vbe_mode_info_valid(struct edid *edid, uintptr_t fb_addr)
{
edid_fb.physical_address = fb_addr;
edid_fb.x_resolution = edid->x_resolution;
edid_fb.y_resolution = edid->y_resolution;
edid_fb.bytes_per_line = edid->bytes_per_line;
/* In the case of (e.g.) 24bpp, the convention nowadays
* seems to be to round it up to the nearest reasonable
* boundary, because otherwise the byte-packing is hideous.
* So, for example, in RGB with no alpha, the bytes are still
* packed into 32-bit words, the so-called 32bpp-no-alpha mode.
* Or, in 5:6:5 mode, the bytes are also packed into 32-bit words,
* and in 4:4:4 mode, they are packed into 16-bit words.
* Good call on the hardware guys part.
* It's not clear we're covering all cases here, but
* I'm not sure with grahpics you ever can.
*/
edid_fb.bits_per_pixel = edid->bpp;
switch(edid->bpp){
case 32:
case 24:
/* packed into 4-byte words */
edid_fb.red_mask_pos = 16;
edid_fb.red_mask_size = 8;
edid_fb.green_mask_pos = 8;
edid_fb.green_mask_size = 8;
edid_fb.blue_mask_pos = 0;
edid_fb.blue_mask_size = 8;
break;
case 16:
/* packed into 2-byte words */
edid_fb.red_mask_pos = 11;
edid_fb.red_mask_size = 5;
edid_fb.green_mask_pos = 5;
edid_fb.green_mask_size = 6;
edid_fb.blue_mask_pos = 0;
edid_fb.blue_mask_size = 5;
break;
default:
printk(BIOS_SPEW, "%s: unsupported BPP %d\n", __func__,
edid->bpp);
return;
}
edid_fb.reserved_mask_pos = 0;
edid_fb.reserved_mask_size = 0;
vbe_valid = 1;
}
int vbe_mode_info_valid(void)
{
return vbe_valid;
}
void fill_lb_framebuffer(struct lb_framebuffer *framebuffer)
{
*framebuffer = edid_fb;
}
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