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edid: add support for DisplayID extension (5k resolution)

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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>
This commit is contained in:
Konstantin Nazarov 2021-04-27 17:08:24 +02:00 committed by Gerd Hoffmann
parent 5a4e88cf3b
commit 35f171a2eb
2 changed files with 74 additions and 6 deletions
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78
hw/display/edid-generate.c
View File

@ -229,8 +229,8 @@ static void edid_desc_ranges(uint8_t *desc)
desc[7] = 30;
desc[8] = 160;
/* max dot clock (1200 MHz) */
desc[9] = 1200 / 10;
/* max dot clock (2550 MHz) */
desc[9] = 2550 / 10;
/* no extended timing information */
desc[10] = 0x01;
@ -336,15 +336,61 @@ 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 =============== */
@ -360,6 +406,9 @@ void qemu_edid_generate(uint8_t *edid, size_t size,
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;
@ -377,6 +426,12 @@ void qemu_edid_generate(uint8_t *edid, size_t size,
edid_ext_dta(dta);
}
if (size >= 384 && large_screen) {
did = edid + 256;
edid[126]++;
init_displayid(did);
}
/* =============== header information =============== */
/* fixed */
@ -441,9 +496,12 @@ void qemu_edid_generate(uint8_t *edid, size_t size,
/* =============== descriptor blocks =============== */
edid_desc_timing(desc, refresh_rate, info->prefx, info->prefy,
width_mm, height_mm);
desc = edid_desc_next(edid, dta, desc);
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);
@ -472,12 +530,22 @@ void qemu_edid_generate(uint8_t *edid, size_t size,
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)

2
hw/display/vga-pci.c
View File

@ -49,7 +49,7 @@ struct PCIVGAState {
qemu_edid_info edid_info;
MemoryRegion mmio;
MemoryRegion mrs[4];
uint8_t edid[256];
uint8_t edid[384];
};
#define TYPE_PCI_VGA "pci-vga"