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 ---
drivers/video/stm32/stm32_ltdc.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/video/stm32/stm32_ltdc.c b/drivers/video/stm32/stm32_ltdc.c index 65c882d9f1..87e5fd54d9 100644 --- a/drivers/video/stm32/stm32_ltdc.c +++ b/drivers/video/stm32/stm32_ltdc.c @@ -459,7 +459,10 @@ static int stm32_ltdc_bind(struct udevice *dev) 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; }