linux-kernel - [PATCH v2 0/2] arm64: dts: qcom: sm8[56]50: correct MDSS interconnects

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Message-Id: <20241026-fix-sm8x50-mdp-icc-v2-0-fd8ddf755acc@linaro.org>
Date: Sat, 26 Oct 2024 20:59:39 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Neil Armstrong <neil.armstrong@...aro.org>
Cc: Abhinav Kumar <quic_abhinavk@...cinc.com>, 
 Rob Clark <robdclark@...il.com>, 
 Marijn Suijten <marijn.suijten@...ainline.org>, 
 linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, freedreno@...ts.freedesktop.org, 
 stable@...nel.org
Subject: [PATCH v2 0/2] arm64: dts: qcom: sm8[56]50: correct MDSS
 interconnects

Both SM8550 and SM8650 misuse mdp1-mem interconnect path for the
LLCC->EBI path, while it should only be used for the MDP->EBI paths.

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 mdp1-mem paths and use MDP-EBI path directly.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
---
Changes in v2:
- Fixed type in 'degrading' in the commit messages (Konrad)
- Link to v1: https://lore.kernel.org/r/20241008-fix-sm8x50-mdp-icc-v1-0-77ffd361b8de@linaro.org

---
Dmitry Baryshkov (2):
      arm64: dts: qcom: sm8550: correct MDSS interconnects
      arm64: dts: qcom: sm8650: correct MDSS interconnects

 arch/arm64/boot/dts/qcom/sm8550.dtsi | 5 ++---
 arch/arm64/boot/dts/qcom/sm8650.dtsi | 5 +----
 2 files changed, 3 insertions(+), 7 deletions(-)
---
base-commit: 7f773fd61baa9b136faa5c4e6555aa64c758d07c
change-id: 20241006-fix-sm8x50-mdp-icc-138afd0e083a

Best regards,
-- 
Dmitry Baryshkov <dmitry.baryshkov@...aro.org>