video: Add simple driver for ST-Ericsson MCDE with pre-configured display
The U-Boot port for ST-Ericsson Ux500 is currently only used on the
"stemmy" board, where U-Boot runs after firmware that already sets up
a boot splash screen. This means that the display is already on
and we can just continue using it for U-Boot.
Add a simple driver that simplifies this by reading the display
configuration (e.g. screen size, bpp) from the hardware registers.
It also checks the configured "source synchronization" - for some
displays (usually DSI command mode displays) we need to explicitly
trigger a software sync. This is done through the video_sync()
callback that triggers the sync and wait for completion.
Cc: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index b69ffca..e614a04 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -854,6 +854,18 @@
The video output is initialized by U-Boot, and kept by the
kernel.
+config VIDEO_MCDE_SIMPLE
+ bool "Simple driver for ST-Ericsson MCDE with preconfigured display"
+ depends on DM_VIDEO
+ help
+ Enables a simple display driver for ST-Ericsson MCDE
+ (Multichannel Display Engine), which reads the configuration from
+ the MCDE registers.
+
+ This driver assumes that the display hardware has been initialized
+ before u-boot starts, and u-boot will simply render to the pre-
+ allocated frame buffer surface.
+
config OSD
bool "Enable OSD support"
depends on DM