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ARM: dts: sun4i: Add simplefb node with de_fe0-de_be0-lcd0-hdmi pipeline

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Testing has shown that on sun4i the display backend engine does not have
deep enough fifo-s causing flickering / tearing in full-hd mode due to
fifo underruns. This can be avoided by letting the display frontend engine
do the dma from memory, and then letting it feed the data directly into
the backend unmodified, as the frontend does have deep enough fifo-s.

Note since u-boot-v2015.01 has been released using the de_be0-lcd0-hdmi
pipeline on sun4i, we need to keep that one around too (unfortunately).

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
This commit is contained in:
Hans de Goede 2015-01-19 14:01:17 +01:00 committed by Maxime Ripard
parent 6ba8bbe8e2
commit 8cedd66284
1 changed files with 8 additions and 0 deletions
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8
arch/arm/boot/dts/sun4i-a10.dtsi
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@ -39,6 +39,14 @@
<&ahb_gates 44>;
status = "disabled";
};
framebuffer@1 {
compatible = "allwinner,simple-framebuffer", "simple-framebuffer";
allwinner,pipeline = "de_fe0-de_be0-lcd0-hdmi";
clocks = <&pll5 1>, <&ahb_gates 36>, <&ahb_gates 43>,
<&ahb_gates 44>, <&ahb_gates 46>;
status = "disabled";
};
};
cpus {