From d396a47bac8a694ff5236d78934293746e7b137a Mon Sep 17 00:00:00 2001 From: Dmitry Baryshkov Date: Sat, 26 Oct 2024 20:59:41 +0300 Subject: [PATCH] arm64: dts: qcom: sm8650: correct MDSS interconnects BugLink: https://bugs.launchpad.net/bugs/2114239 commit 9fa33cbca3d2842f1f47ed4e5f6574e611dae32b upstream. SM8650 lists two interconnects for the display subsystem, mdp0-mem (between MDP and LLCC) and mdp1-mem (between LLCC and EBI, memory). The second interconnect is a misuse. mdpN-mem paths should be used for several outboud MDP interconnects rather than the path between LLCC and memory. This kind of misuse can result in bandwidth underflows, possibly degrading picture quality as the required memory bandwidth is divided between all mdpN-mem paths (and LLCC-EBI should not be a part of such division). Drop the second path and use direct MDP-EBI path for mdp0-mem until we support separate MDP-LLCC and LLCC-EBI paths. Fixes: 10e024671295 ("arm64: dts: qcom: sm8650: add interconnect dependent device nodes") Cc: stable@kernel.org Signed-off-by: Dmitry Baryshkov Link: https://lore.kernel.org/r/20241026-fix-sm8x50-mdp-icc-v2-2-fd8ddf755acc@linaro.org Signed-off-by: Bjorn Andersson Signed-off-by: Greg Kroah-Hartman Signed-off-by: Noah Wager Signed-off-by: Mehmet Basaran --- arch/arm64/boot/dts/qcom/sm8650.dtsi | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/arch/arm64/boot/dts/qcom/sm8650.dtsi b/arch/arm64/boot/dts/qcom/sm8650.dtsi index 72adbea83a4b..9670bb859311 100644 --- a/arch/arm64/boot/dts/qcom/sm8650.dtsi +++ b/arch/arm64/boot/dts/qcom/sm8650.dtsi @@ -3080,11 +3080,8 @@ resets = <&dispcc DISP_CC_MDSS_CORE_BCR>; interconnects = <&mmss_noc MASTER_MDP QCOM_ICC_TAG_ALWAYS - &gem_noc SLAVE_LLCC QCOM_ICC_TAG_ALWAYS>, - <&mc_virt MASTER_LLCC QCOM_ICC_TAG_ALWAYS &mc_virt SLAVE_EBI1 QCOM_ICC_TAG_ALWAYS>; - interconnect-names = "mdp0-mem", - "mdp1-mem"; + interconnect-names = "mdp0-mem"; power-domains = <&dispcc MDSS_GDSC>;