45 lines
1.6 KiB
Diff
45 lines
1.6 KiB
Diff
From 5429cd33ae8abeada683b08bab6d13f6227e2734 Mon Sep 17 00:00:00 2001
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From: Hans de Goede <hdegoede@redhat.com>
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Date: Mon, 19 Jan 2015 14:01:17 +0100
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Subject: [PATCH 14/15] ARM: dts: sun4i: Add simplefb node with
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de_fe0-de_be0-lcd0-hdmi pipeline
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Origin: https://git.kernel.org/linus/8cedd6628472aa2d8f2f54dfcc36633e46a59db8
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Testing has shown that on sun4i the display backend engine does not have
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deep enough fifo-s causing flickering / tearing in full-hd mode due to
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fifo underruns. This can be avoided by letting the display frontend engine
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do the dma from memory, and then letting it feed the data directly into
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the backend unmodified, as the frontend does have deep enough fifo-s.
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Note since u-boot-v2015.01 has been released using the de_be0-lcd0-hdmi
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pipeline on sun4i, we need to keep that one around too (unfortunately).
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Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
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---
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arch/arm/boot/dts/sun4i-a10.dtsi | 8 ++++++++
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1 file changed, 8 insertions(+)
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diff --git a/arch/arm/boot/dts/sun4i-a10.dtsi b/arch/arm/boot/dts/sun4i-a10.dtsi
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index a9a657c..7e3e5dd 100644
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--- a/arch/arm/boot/dts/sun4i-a10.dtsi
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+++ b/arch/arm/boot/dts/sun4i-a10.dtsi
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@@ -39,6 +39,14 @@
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<&ahb_gates 44>;
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status = "disabled";
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};
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+
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+ framebuffer@1 {
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+ compatible = "allwinner,simple-framebuffer", "simple-framebuffer";
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+ allwinner,pipeline = "de_fe0-de_be0-lcd0-hdmi";
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+ clocks = <&pll5 1>, <&ahb_gates 36>, <&ahb_gates 43>,
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+ <&ahb_gates 44>, <&ahb_gates 46>;
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+ status = "disabled";
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+ };
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};
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cpus {
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--
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2.1.4
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