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x86: coreboot: Enable VIDEO_COPY

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At least on modern machines the write-back mechanism for the frame buffer
is quite slow when scrolling, since it must read the entire frame buffer
and write it back.

Enable the VIDEO_COPY feature to resolve this problem.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2023-09-19 21:00:11 -06:00 committed by Bin Meng
parent 85c35c794e
commit 3fef0def84
4 changed files with 15 additions and 0 deletions
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1
arch/x86/dts/coreboot.dts
View file

@ -42,6 +42,7 @@
};
coreboot-fb {
bootph-some-ram;
compatible = "coreboot-fb";
};
};

1
configs/coreboot64_defconfig
View file

@ -59,6 +59,7 @@ CONFIG_NVME_PCI=y
CONFIG_SYS_NS16550_MEM32=y
CONFIG_SOUND=y
CONFIG_SOUND_I8254=y
CONFIG_VIDEO_COPY=y
CONFIG_CONSOLE_SCROLL_LINES=5
CONFIG_SPL_ACPI=y
CONFIG_CMD_DHRYSTONE=y

1
configs/coreboot_defconfig
View file

@ -53,6 +53,7 @@ CONFIG_NVME_PCI=y
CONFIG_SYS_NS16550_MEM32=y
CONFIG_SOUND=y
CONFIG_SOUND_I8254=y
CONFIG_VIDEO_COPY=y
CONFIG_CONSOLE_SCROLL_LINES=5
CONFIG_CMD_DHRYSTONE=y
# CONFIG_GZIP is not set

12
drivers/video/coreboot.c
View file

@ -73,6 +73,17 @@ err:
return ret;
}
static int coreboot_video_bind(struct udevice *dev)
{
struct video_uc_plat *uc_plat = dev_get_uclass_plat(dev);
/* Set the maximum supported resolution */
uc_plat->size = 4096 * 2160 * 4;
log_debug("%s: Frame buffer size %x\n", __func__, uc_plat->size);
return 0;
}
static const struct udevice_id coreboot_video_ids[] = {
{ .compatible = "coreboot-fb" },
{ }
@ -82,5 +93,6 @@ U_BOOT_DRIVER(coreboot_video) = {
.name = "coreboot_video",
.id = UCLASS_VIDEO,
.of_match = coreboot_video_ids,
.bind = coreboot_video_bind,
.probe = coreboot_video_probe,
};