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authorHans de Goede <hdegoede@redhat.com>2015-01-19 14:01:17 +0100
committerMaxime Ripard <maxime.ripard@free-electrons.com>2015-01-21 09:56:35 +0100
commit8cedd6628472aa2d8f2f54dfcc36633e46a59db8 (patch)
tree302b973b24272d6d6ef3fb7da1fde4ee624127a2
parent6ba8bbe8e283674bd9737bcb31a9c55ba4f8fbee (diff)
ARM: dts: sun4i: Add simplefb node with de_fe0-de_be0-lcd0-hdmi pipeline
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>
-rw-r--r--arch/arm/boot/dts/sun4i-a10.dtsi8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/arm/boot/dts/sun4i-a10.dtsi b/arch/arm/boot/dts/sun4i-a10.dtsi
index e3422309e54b..3b25de8f5fce 100644
--- a/arch/arm/boot/dts/sun4i-a10.dtsi
+++ b/arch/arm/boot/dts/sun4i-a10.dtsi
@@ -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 {