Hi, On Tue, Jan 06, 2026 at 03:25:40PM +0100, Francesco Valla wrote: > Add a DRM client that draws a simple splash, with possibility to show: > > - a colored background; > - a static BMP image (loaded as firmware); > - the logo provided by EFI BGRT. > > The client is not meant to replace a full-featured bootsplash, but > rather to remove some complexity (and hopefully boot time) on small > embedded platforms or on systems with a limited scope (e.g: recovery > or manufacturing images). > > The background color can be set either at build time from a dedicated > config option or at runtime through the drm_client_lib.splash_color > command line parameter. Any color in RGB888 format can be used. > > If enabled, the static BMP image is loaded using the kernel firmware > infrastructure; a valid BMP image with 24bpp color and no compression > is expected. The name of the image can be set through the > drm_client_lib.splash_bmp kernel command line parameter, with the > default being 'drm_splash.bmp'. > > Just like the existing DRM clients, the splash can be enabled from the > kernel command line using drm_client_lib.active=splash. > > Signed-off-by: Francesco Valla <[email protected]> > --- > drivers/gpu/drm/clients/Kconfig | 79 ++- > drivers/gpu/drm/clients/Makefile | 1 + > drivers/gpu/drm/clients/drm_client_internal.h | 9 + > drivers/gpu/drm/clients/drm_client_setup.c | 8 + > drivers/gpu/drm/clients/drm_splash.c | 883 > ++++++++++++++++++++++++++ > 5 files changed, 979 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/clients/Kconfig b/drivers/gpu/drm/clients/Kconfig > index > 6096c623d9d5b1a3d4a40d986c45aad2f8277767..dd8cd6cacd1166932eb3890dd816b9ae2d26330f > 100644 > --- a/drivers/gpu/drm/clients/Kconfig > +++ b/drivers/gpu/drm/clients/Kconfig > @@ -12,6 +12,7 @@ config DRM_CLIENT_LIB > config DRM_CLIENT_SELECTION > tristate > depends on DRM > + select DRM_CLIENT_LIB if DRM_CLIENT_SPLASH > select DRM_CLIENT_LIB if DRM_CLIENT_LOG > select DRM_CLIENT_LIB if DRM_FBDEV_EMULATION > help > @@ -85,10 +86,79 @@ config DRM_CLIENT_LOG > If you only need logs, but no terminal, or if you prefer userspace > terminal, say "Y". > > +config DRM_CLIENT_SPLASH > + bool "Display graphic splash" > + depends on DRM_CLIENT_SELECTION > + select DRM_CLIENT > + select DRM_CLIENT_SETUP > + select DRM_DRAW > + help > + This enables a splash drm client, able to display either a plain > + color or a static image until the userspace is ready to take over. > + The splash will be displayed on all screens available at boot, if > + any, or on the ones part of the first hotplug event. > + > +config DRM_CLIENT_SPLASH_BACKGROUND_COLOR > + hex "Splash background color" > + depends on DRM_CLIENT_SPLASH > + default 0x000000 > + help > + The default splash background color, in RGB888 format. > + > + The color can be overridden through the drm_client_lib.splash_color > + kernel command line parameter. > + > +config DRM_CLIENT_SPLASH_BMP_SUPPORT > + bool > + > +choice > + prompt "Splash source" > + depends on DRM_CLIENT_SPLASH > + default DRM_CLIENT_SPLASH_SRC_COLOR > + help > + Selects the source for the splash graphic. > + > +config DRM_CLIENT_SPLASH_SRC_COLOR > + bool "Solid color" > + help > + Use a solid color as splash. The color is selected through the > + DRM_CLIENT_SPLASH_BACKGROUND_COLOR config option. > + > + The image will be loaded using the firmware loading facility the > + kernel provides. > + > +config DRM_CLIENT_SPLASH_SRC_BMP > + bool "BMP image" > + select DRM_CLIENT_SPLASH_BMP_SUPPORT > + select FW_LOADER > + help > + Use a BMP (bitmap) image as splash. If the image is smaller than the > + display(s), it will be centered and the color specified through the > + DRM_CLIENT_SPLASH_BACKGROUND_COLOR config option will be used as > + background. > + > + The image will be loaded using the firmware loading facility the > + kernel provides; it shall use 24 bits per pixel and shall not be > + compressed. The name of the file can be set through the > + drm_client_lib.splash_bmp command line parameter, with the default > + being 'drm_splash.bmp'. > + > +config DRM_CLIENT_SPLASH_SRC_BGRT > + bool "EFI BGRT" > + select DRM_CLIENT_SPLASH_BMP_SUPPORT > + depends on EFI > + help > + Use the BGRT image provided by the EFI bootloader. If the image is > + smaller than the display(s), it will be centered and the color > + specified through the DRM_CLIENT_SPLASH_BACKGROUND_COLOR config > + option will be used as background. > + > +endchoice
I'm not sure we should consider it a xor choice. If we do, that means that it's effectively unusable by distros, since you don't know ahead of time if the platform it's going to boot on will have a BGRT or not. Trying BGRT, and then falling back to either an image or a solid background would be easier to work with. Maxime
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