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soc/mediatek/common: Add bootsplash support

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This change introduces support for displaying a bootsplash logo during
boot on Mediatek platforms.

A new `display_logo` function is added to render a logo from the CBFS
into the framebuffer. This function is called from `mtk_display_init` if
`BMP_LOGO` is enabled in the board's Kconfig.

Additionally, this change refactors the backlight configuration logic
into a new `panel_configure_backlight` helper function for better
clarity.

BUG=b:319511268
TEST=Verified on Hylia that the bootsplash logo is displayed correctly
during ramstage. Boot time increased by 562ms due to display
initialization.

Change-Id: Ibcfaa7d309eb4a0b14244b98c78a0dc32e6836e5
Signed-off-by: Yidi Lin <yidilin@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/89543
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Yidi Lin 2025-10-13 11:35:39 +08:00
commit 193420fe0b
1 changed files with 36 additions and 2 deletions
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38
src/soc/mediatek/common/display.c
View file

@ -1,5 +1,7 @@
/* SPDX-License-Identifier: GPL-2.0-only */
#include <assert.h>
#include <bootsplash.h>
#include <cbfs.h>
#include <console/console.h>
#include <delay.h>
@ -64,6 +66,35 @@ static void process_panel_quirks(struct mtk_dp *mtk_dp,
mtk_dp->force_max_swing = true;
}
static void panel_configure_backlight(struct panel_description *panel,
bool enable)
{
assert(panel);
if (!panel->configure_backlight)
return;
panel->configure_backlight(enable);
}
static void display_logo(struct panel_description *panel,
uintptr_t fb_addr,
const struct edid *edid)
{
memset((void *)fb_addr, 0, edid->bytes_per_line * edid->y_resolution);
struct logo_config config = {
.panel_orientation = panel->orientation,
.halignment = FW_SPLASH_HALIGNMENT_CENTER,
.valignment = FW_SPLASH_VALIGNMENT_CENTER,
.logo_bottom_margin = 100,
};
render_logo_to_framebuffer(&config);
mtk_ddp_ovlsys_start(fb_addr);
panel_configure_backlight(panel, true);
}
int mtk_display_init(void)
{
struct edid edid = {0};
@ -84,8 +115,8 @@ int mtk_display_init(void)
mtcmos_protect_display_bus();
/* Set up backlight control pins as output pin and turn-off the backlight */
if (panel->configure_backlight)
panel->configure_backlight(false);
panel_configure_backlight(panel, false);
if (panel->power_on)
panel->power_on();
@ -152,5 +183,8 @@ int mtk_display_init(void)
if (info)
fb_set_orientation(info, panel->orientation);
if (CONFIG(BMP_LOGO))
display_logo(panel, fb_addr, &edid);
return 0;
}