From: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
To: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
Bjorn Andersson <andersson@kernel.org>,
Konrad Dybcio <konradybcio@kernel.org>,
Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>,
Neil Armstrong <neil.armstrong@linaro.org>
Cc: Abhinav Kumar <quic_abhinavk@quicinc.com>,
Rob Clark <robdclark@gmail.com>,
Marijn Suijten <marijn.suijten@somainline.org>,
linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, freedreno@lists.freedesktop.org,
stable@kernel.org
Subject: Re: [PATCH v2 1/2] arm64: dts: qcom: sm8550: correct MDSS interconnects
Date: Mon, 2 Dec 2024 15:39:04 +0100 [thread overview]
Message-ID: <d8e1c1d0-a375-4944-aada-2bbd6a4739ff@oss.qualcomm.com> (raw)
In-Reply-To: <20241026-fix-sm8x50-mdp-icc-v2-1-fd8ddf755acc@linaro.org>
On 26.10.2024 7:59 PM, Dmitry Baryshkov wrote:
> SM8550 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: d7da51db5b81 ("arm64: dts: qcom: sm8550: add display hardware devices")
> Cc: stable@kernel.org
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> ---
Feel free to use QCOM_ICC_TAG_ALWAYS, for both patches:
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Konrad
next prev parent reply other threads:[~2024-12-02 14:39 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-10-26 17:59 [PATCH v2 0/2] arm64: dts: qcom: sm8[56]50: correct MDSS interconnects Dmitry Baryshkov
2024-10-26 17:59 ` [PATCH v2 1/2] arm64: dts: qcom: sm8550: " Dmitry Baryshkov
2024-12-02 14:39 ` Konrad Dybcio [this message]
2024-10-26 17:59 ` [PATCH v2 2/2] arm64: dts: qcom: sm8650: " Dmitry Baryshkov
2024-12-30 9:42 ` Neil Armstrong
2024-12-27 4:15 ` [PATCH v2 0/2] arm64: dts: qcom: sm8[56]50: " Bjorn Andersson
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