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video: stm32: stm32_ltdc: align framebuffer on 2MB

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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>
This commit is contained in:
Patrick Delaunay 2021-11-15 16:32:22 +01:00 • committed by Patrice Chotard
parent 77debf61ef
commit 6cdeb323b8
1 changed files with 4 additions and 1 deletions
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5
drivers/video/stm32/stm32_ltdc.c
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@ -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;
}