video: stm32: stm32_ltdc: align framebuffer on 2MB
Align the framebuffer size on MMU_SECTION_SIZE in kernel, = max 2MB for
LPAE for armV7, to avoid issue with the simple frame buffer activation,
when U-Boot add a reserved memory in the kernel device tree to preserve
the splash screen until Linux driver initialization.
See Linux documentation for details:
Documentation/devicetree/bindings/display/simple-framebuffer.yaml
Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
diff --git a/drivers/video/stm32/stm32_ltdc.c b/drivers/video/stm32/stm32_ltdc.c
index 65c882d..87e5fd5 100644
--- a/drivers/video/stm32/stm32_ltdc.c
+++ b/drivers/video/stm32/stm32_ltdc.c
@@ -459,7 +459,10 @@
uc_plat->size = CONFIG_VIDEO_STM32_MAX_XRES *
CONFIG_VIDEO_STM32_MAX_YRES *
(CONFIG_VIDEO_STM32_MAX_BPP >> 3);
- dev_dbg(dev, "frame buffer max size %d bytes\n", uc_plat->size);
+ /* align framebuffer on kernel MMU_SECTION_SIZE = max 2MB for LPAE */
+ uc_plat->align = SZ_2M;
+ dev_dbg(dev, "frame buffer max size %d bytes align %x\n",
+ uc_plat->size, uc_plat->align);
return 0;
}