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qemu/hw/display/edid-generate.c
Konstantin Nazarov 35f171a2eb edid: add support for DisplayID extension (5k resolution) 
The Detailed Timing Descriptor has only 12 bits to store the
resolution. This limits the guest to 4095 pixels.

This patch adds support for the DisplayID extension, that has 2 full
bytes for that purpose, thus allowing 5k resolutions and above.

Based-on: <20210303152948.59943-2-akihiko.odaki@gmail.com>
Signed-off-by: Konstantin Nazarov <mail@knazarov.com>
Message-Id: <20210315114639.91953-3-mail@knazarov.com>

[ kraxel: minor workflow tweaks ]

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 20210427150824.638359-1-kraxel@redhat.com
Message-Id: <20210427150824.638359-9-kraxel@redhat.com>
2021-05-10 11:41:02 +02:00

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/*
* QEMU EDID generator.
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "qemu/bswap.h"
#include "hw/display/edid.h"
static const struct edid_mode {
uint32_t xres;
uint32_t yres;
uint32_t byte;
uint32_t xtra3;
uint32_t bit;
uint32_t dta;
} modes[] = {
/* dea/dta extension timings (all @ 50 Hz) */
{ .xres = 5120, .yres = 2160, .dta = 125 },
{ .xres = 4096, .yres = 2160, .dta = 101 },
{ .xres = 3840, .yres = 2160, .dta = 96 },
{ .xres = 2560, .yres = 1080, .dta = 89 },
{ .xres = 2048, .yres = 1152 },
{ .xres = 1920, .yres = 1080, .dta = 31 },
/* additional standard timings 3 (all @ 60Hz) */
{ .xres = 1920, .yres = 1200, .xtra3 = 10, .bit = 0 },
{ .xres = 1600, .yres = 1200, .xtra3 = 9, .bit = 2 },
{ .xres = 1680, .yres = 1050, .xtra3 = 9, .bit = 5 },
{ .xres = 1440, .yres = 900, .xtra3 = 8, .bit = 5 },
{ .xres = 1280, .yres = 1024, .xtra3 = 7, .bit = 1 },
{ .xres = 1280, .yres = 960, .xtra3 = 7, .bit = 3 },
{ .xres = 1280, .yres = 768, .xtra3 = 7, .bit = 6 },
{ .xres = 1920, .yres = 1440, .xtra3 = 11, .bit = 5 },
{ .xres = 1856, .yres = 1392, .xtra3 = 10, .bit = 3 },
{ .xres = 1792, .yres = 1344, .xtra3 = 10, .bit = 5 },
{ .xres = 1440, .yres = 1050, .xtra3 = 8, .bit = 1 },
{ .xres = 1360, .yres = 768, .xtra3 = 8, .bit = 7 },
/* established timings (all @ 60Hz) */
{ .xres = 1024, .yres = 768, .byte = 36, .bit = 3 },
{ .xres = 800, .yres = 600, .byte = 35, .bit = 0 },
{ .xres = 640, .yres = 480, .byte = 35, .bit = 5 },
};
typedef struct Timings {
uint32_t xfront;
uint32_t xsync;
uint32_t xblank;
uint32_t yfront;
uint32_t ysync;
uint32_t yblank;
uint64_t clock;
} Timings;
static void generate_timings(Timings *timings, uint32_t refresh_rate,
uint32_t xres, uint32_t yres)
{
/* pull some realistic looking timings out of thin air */
timings->xfront = xres * 25 / 100;
timings->xsync = xres * 3 / 100;
timings->xblank = xres * 35 / 100;
timings->yfront = yres * 5 / 1000;
timings->ysync = yres * 5 / 1000;
timings->yblank = yres * 35 / 1000;
timings->clock = ((uint64_t)refresh_rate *
(xres + timings->xblank) *
(yres + timings->yblank)) / 10000000;
}
static void edid_ext_dta(uint8_t *dta)
{
dta[0] = 0x02;
dta[1] = 0x03;
dta[2] = 0x05;
dta[3] = 0x00;
/* video data block */
dta[4] = 0x40;
}
static void edid_ext_dta_mode(uint8_t *dta, uint8_t nr)
{
dta[dta[2]] = nr;
dta[2]++;
dta[4]++;
}
static int edid_std_mode(uint8_t *mode, uint32_t xres, uint32_t yres)
{
uint32_t aspect;
if (xres == 0 || yres == 0) {
mode[0] = 0x01;
mode[1] = 0x01;
return 0;
} else if (xres * 10 == yres * 16) {
aspect = 0;
} else if (xres * 3 == yres * 4) {
aspect = 1;
} else if (xres * 4 == yres * 5) {
aspect = 2;
} else if (xres * 9 == yres * 16) {
aspect = 3;
} else {
return -1;
}
if ((xres / 8) - 31 > 255) {
return -1;
}
mode[0] = (xres / 8) - 31;
mode[1] = ((aspect << 6) | (60 - 60));
return 0;
}
static void edid_fill_modes(uint8_t *edid, uint8_t *xtra3, uint8_t *dta,
uint32_t maxx, uint32_t maxy)
{
const struct edid_mode *mode;
int std = 38;
int rc, i;
for (i = 0; i < ARRAY_SIZE(modes); i++) {
mode = modes + i;
if ((maxx && mode->xres > maxx) ||
(maxy && mode->yres > maxy)) {
continue;
}
if (mode->byte) {
edid[mode->byte] |= (1 << mode->bit);
} else if (std < 54) {
rc = edid_std_mode(edid + std, mode->xres, mode->yres);
if (rc == 0) {
std += 2;
}
} else if (mode->xtra3 && xtra3) {
xtra3[mode->xtra3] |= (1 << mode->bit);
}
if (dta && mode->dta) {
edid_ext_dta_mode(dta, mode->dta);
}
}
while (std < 54) {
edid_std_mode(edid + std, 0, 0);
std += 2;
}
}
static void edid_checksum(uint8_t *edid, size_t len)
{
uint32_t sum = 0;
int i;
for (i = 0; i < len; i++) {
sum += edid[i];
}
sum &= 0xff;
if (sum) {
edid[len] = 0x100 - sum;
}
}
static uint8_t *edid_desc_next(uint8_t *edid, uint8_t *dta, uint8_t *desc)
{
if (desc == NULL) {
return NULL;
}
if (desc + 18 + 18 < edid + 127) {
return desc + 18;
}
if (dta) {
if (desc < edid + 127) {
return dta + dta[2];
}
if (desc + 18 + 18 < dta + 127) {
return desc + 18;
}
}
return NULL;
}
static void edid_desc_type(uint8_t *desc, uint8_t type)
{
desc[0] = 0;
desc[1] = 0;
desc[2] = 0;
desc[3] = type;
desc[4] = 0;
}
static void edid_desc_text(uint8_t *desc, uint8_t type,
const char *text)
{
size_t len;
edid_desc_type(desc, type);
memset(desc + 5, ' ', 13);
len = strlen(text);
if (len > 12) {
len = 12;
}
memcpy(desc + 5, text, len);
desc[5 + len] = '\n';
}
static void edid_desc_ranges(uint8_t *desc)
{
edid_desc_type(desc, 0xfd);
/* vertical (50 -> 125 Hz) */
desc[5] = 50;
desc[6] = 125;
/* horizontal (30 -> 160 kHz) */
desc[7] = 30;
desc[8] = 160;
/* max dot clock (2550 MHz) */
desc[9] = 2550 / 10;
/* no extended timing information */
desc[10] = 0x01;
/* padding */
desc[11] = '\n';
memset(desc + 12, ' ', 6);
}
/* additional standard timings 3 */
static void edid_desc_xtra3_std(uint8_t *desc)
{
edid_desc_type(desc, 0xf7);
desc[5] = 10;
}
static void edid_desc_dummy(uint8_t *desc)
{
edid_desc_type(desc, 0x10);
}
static void edid_desc_timing(uint8_t *desc, uint32_t refresh_rate,
uint32_t xres, uint32_t yres,
uint32_t xmm, uint32_t ymm)
{
Timings timings;
generate_timings(&timings, refresh_rate, xres, yres);
stl_le_p(desc, timings.clock);
desc[2] = xres & 0xff;
desc[3] = timings.xblank & 0xff;
desc[4] = (((xres & 0xf00) >> 4) |
((timings.xblank & 0xf00) >> 8));
desc[5] = yres & 0xff;
desc[6] = timings.yblank & 0xff;
desc[7] = (((yres & 0xf00) >> 4) |
((timings.yblank & 0xf00) >> 8));
desc[8] = timings.xfront & 0xff;
desc[9] = timings.xsync & 0xff;
desc[10] = (((timings.yfront & 0x00f) << 4) |
((timings.ysync & 0x00f) << 0));
desc[11] = (((timings.xfront & 0x300) >> 2) |
((timings.xsync & 0x300) >> 4) |
((timings.yfront & 0x030) >> 2) |
((timings.ysync & 0x030) >> 4));
desc[12] = xmm & 0xff;
desc[13] = ymm & 0xff;
desc[14] = (((xmm & 0xf00) >> 4) |
((ymm & 0xf00) >> 8));
desc[17] = 0x18;
}
static uint32_t edid_to_10bit(float value)
{
return (uint32_t)(value * 1024 + 0.5);
}
static void edid_colorspace(uint8_t *edid,
float rx, float ry,
float gx, float gy,
float bx, float by,
float wx, float wy)
{
uint32_t red_x = edid_to_10bit(rx);
uint32_t red_y = edid_to_10bit(ry);
uint32_t green_x = edid_to_10bit(gx);
uint32_t green_y = edid_to_10bit(gy);
uint32_t blue_x = edid_to_10bit(bx);
uint32_t blue_y = edid_to_10bit(by);
uint32_t white_x = edid_to_10bit(wx);
uint32_t white_y = edid_to_10bit(wy);
edid[25] = (((red_x & 0x03) << 6) |
((red_y & 0x03) << 4) |
((green_x & 0x03) << 2) |
((green_y & 0x03) << 0));
edid[26] = (((blue_x & 0x03) << 6) |
((blue_y & 0x03) << 4) |
((white_x & 0x03) << 2) |
((white_y & 0x03) << 0));
edid[27] = red_x >> 2;
edid[28] = red_y >> 2;
edid[29] = green_x >> 2;
edid[30] = green_y >> 2;
edid[31] = blue_x >> 2;
edid[32] = blue_y >> 2;
edid[33] = white_x >> 2;
edid[34] = white_y >> 2;
}
static uint32_t qemu_edid_dpi_from_mm(uint32_t mm, uint32_t res)
{
return res * 254 / 10 / mm;
}
uint32_t qemu_edid_dpi_to_mm(uint32_t dpi, uint32_t res)
{
return res * 254 / 10 / dpi;
}
static void init_displayid(uint8_t *did)
{
did[0] = 0x70; /* display id extension */
did[1] = 0x13; /* version 1.3 */
did[2] = 4; /* length */
did[3] = 0x03; /* product type (0x03 == standalone display device) */
edid_checksum(did + 1, did[2] + 4);
}
static void qemu_displayid_generate(uint8_t *did, uint32_t refresh_rate,
uint32_t xres, uint32_t yres,
uint32_t xmm, uint32_t ymm)
{
Timings timings;
generate_timings(&timings, refresh_rate, xres, yres);
did[0] = 0x70; /* display id extension */
did[1] = 0x13; /* version 1.3 */
did[2] = 23; /* length */
did[3] = 0x03; /* product type (0x03 == standalone display device) */
did[5] = 0x03; /* Detailed Timings Data Block */
did[6] = 0x00; /* revision */
did[7] = 0x14; /* block length */
did[8] = timings.clock & 0xff;
did[9] = (timings.clock & 0xff00) >> 8;
did[10] = (timings.clock & 0xff0000) >> 16;
did[11] = 0x88; /* leave aspect ratio undefined */
stw_le_p(did + 12, 0xffff & (xres - 1));
stw_le_p(did + 14, 0xffff & (timings.xblank - 1));
stw_le_p(did + 16, 0xffff & (timings.xfront - 1));
stw_le_p(did + 18, 0xffff & (timings.xsync - 1));
stw_le_p(did + 20, 0xffff & (yres - 1));
stw_le_p(did + 22, 0xffff & (timings.yblank - 1));
stw_le_p(did + 24, 0xffff & (timings.yfront - 1));
stw_le_p(did + 26, 0xffff & (timings.ysync - 1));
edid_checksum(did + 1, did[2] + 4);
}
void qemu_edid_generate(uint8_t *edid, size_t size,
qemu_edid_info *info)
{
uint8_t *desc = edid + 54;
uint8_t *xtra3 = NULL;
uint8_t *dta = NULL;
uint8_t *did = NULL;
uint32_t width_mm, height_mm;
uint32_t refresh_rate = info->refresh_rate ? info->refresh_rate : 75000;
uint32_t dpi = 100; /* if no width_mm/height_mm */
uint32_t large_screen = 0;
/* =============== set defaults =============== */
if (!info->vendor || strlen(info->vendor) != 3) {
info->vendor = "RHT";
}
if (!info->name) {
info->name = "QEMU Monitor";
}
if (!info->prefx) {
info->prefx = 1024;
}
if (!info->prefy) {
info->prefy = 768;
}
if (info->prefx >= 4096 || info->prefy >= 4096) {
large_screen = 1;
}
if (info->width_mm && info->height_mm) {
width_mm = info->width_mm;
height_mm = info->height_mm;
dpi = qemu_edid_dpi_from_mm(width_mm, info->prefx);
} else {
width_mm = qemu_edid_dpi_to_mm(dpi, info->prefx);
height_mm = qemu_edid_dpi_to_mm(dpi, info->prefy);
}
/* =============== extensions =============== */
if (size >= 256) {
dta = edid + 128;
edid[126]++;
edid_ext_dta(dta);
}
if (size >= 384 && large_screen) {
did = edid + 256;
edid[126]++;
init_displayid(did);
}
/* =============== header information =============== */
/* fixed */
edid[0] = 0x00;
edid[1] = 0xff;
edid[2] = 0xff;
edid[3] = 0xff;
edid[4] = 0xff;
edid[5] = 0xff;
edid[6] = 0xff;
edid[7] = 0x00;
/* manufacturer id, product code, serial number */
uint16_t vendor_id = ((((info->vendor[0] - '@') & 0x1f) << 10) |
(((info->vendor[1] - '@') & 0x1f) << 5) |
(((info->vendor[2] - '@') & 0x1f) << 0));
uint16_t model_nr = 0x1234;
uint32_t serial_nr = info->serial ? atoi(info->serial) : 0;
stw_be_p(edid + 8, vendor_id);
stw_le_p(edid + 10, model_nr);
stl_le_p(edid + 12, serial_nr);
/* manufacture week and year */
edid[16] = 42;
edid[17] = 2014 - 1990;
/* edid version */
edid[18] = 1;
edid[19] = 4;
/* =============== basic display parameters =============== */
/* video input: digital, 8bpc, displayport */
edid[20] = 0xa5;
/* screen size: undefined */
edid[21] = width_mm / 10;
edid[22] = height_mm / 10;
/* display gamma: 2.2 */
edid[23] = 220 - 100;
/* supported features bitmap: std sRGB, preferred timing */
edid[24] = 0x06;
/* =============== chromaticity coordinates =============== */
/* standard sRGB colorspace */
edid_colorspace(edid,
0.6400, 0.3300, /* red */
0.3000, 0.6000, /* green */
0.1500, 0.0600, /* blue */
0.3127, 0.3290); /* white point */
/* =============== established timing bitmap =============== */
/* =============== standard timing information =============== */
/* both filled by edid_fill_modes() */
/* =============== descriptor blocks =============== */
if (!large_screen) {
/* The DTD section has only 12 bits to store the resolution */
edid_desc_timing(desc, refresh_rate, info->prefx, info->prefy,
width_mm, height_mm);
desc = edid_desc_next(edid, dta, desc);
}
xtra3 = desc;
edid_desc_xtra3_std(xtra3);
desc = edid_desc_next(edid, dta, desc);
edid_fill_modes(edid, xtra3, dta, info->maxx, info->maxy);
/*
* dta video data block is finished at thus point,
* so dta descriptor offsets don't move any more.
*/
edid_desc_ranges(desc);
desc = edid_desc_next(edid, dta, desc);
if (desc && info->name) {
edid_desc_text(desc, 0xfc, info->name);
desc = edid_desc_next(edid, dta, desc);
}
if (desc && info->serial) {
edid_desc_text(desc, 0xff, info->serial);
desc = edid_desc_next(edid, dta, desc);
}
while (desc) {
edid_desc_dummy(desc);
desc = edid_desc_next(edid, dta, desc);
}
/* =============== display id extensions =============== */
if (did && large_screen) {
qemu_displayid_generate(did, refresh_rate, info->prefx, info->prefy,
width_mm, height_mm);
}
/* =============== finish up =============== */
edid_checksum(edid, 127);
if (dta) {
edid_checksum(dta, 127);
}
if (did) {
edid_checksum(did, 127);
}
}
size_t qemu_edid_size(uint8_t *edid)
{
uint32_t exts;
if (edid[0] != 0x00 ||
edid[1] != 0xff) {
/* doesn't look like a valid edid block */
return 0;
}
exts = edid[126];
return 128 * (exts + 1);
}
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