linux-kernel - [stable 4.19][PATCH 1/4] ARM: dts: am4372: Set memory bandwidth limit for DISPC

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Date:   Tue, 15 Oct 2019 00:59:34 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [stable 4.19][PATCH 1/4] ARM: dts: am4372: Set memory bandwidth limit for DISPC

From: Peter Ujfalusi <peter.ujfalusi@...com>

commit f90ec6cdf674248dcad85bf9af6e064bf472b841 upstream

Set memory bandwidth limit to filter out resolutions above 720p@...z to
avoid underflow errors due to the bandwidth needs of higher resolutions.

am43xx can not provide enough bandwidth to DISPC to correctly handle
'high' resolutions.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...com>
Signed-off-by: Tony Lindgren <tony@...mide.com>
Cc: stable <stable@...r.kernel.org> # 4.19
Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
---
 arch/arm/boot/dts/am4372.dtsi | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/boot/dts/am4372.dtsi b/arch/arm/boot/dts/am4372.dtsi
index d4b7c59eec68..cf1e4f747242 100644
--- a/arch/arm/boot/dts/am4372.dtsi
+++ b/arch/arm/boot/dts/am4372.dtsi
@@ -1142,6 +1142,8 @@
 				ti,hwmods = "dss_dispc";
 				clocks = <&disp_clk>;
 				clock-names = "fck";
+
+				max-memory-bandwidth = <230000000>;
 			};
 
 			rfbi: rfbi@...2a800 {
-- 
2.17.1