From: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
To: Michael McAllister <me@michaelmcallister.org>,
Bjorn Andersson <andersson@kernel.org>,
Konrad Dybcio <konradybcio@kernel.org>,
Dmitry Baryshkov <lumag@kernel.org>
Cc: Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>,
Rob Clark <robin.clark@oss.qualcomm.com>,
Abhinav Kumar <abhinav.kumar@linux.dev>,
Jessica Zhang <jesszhan0024@gmail.com>,
Sean Paul <sean@poorly.run>,
Marijn Suijten <marijn.suijten@somainline.org>,
Adam Skladowski <a39.skl@gmail.com>,
linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org,
freedreno@lists.freedesktop.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] arm64: dts: qcom: sm6115: Add missing MDSS AHB clock
Date: Mon, 26 Oct 2026 13:57:21 +0100 [thread overview]
Message-ID: <a272a425-0d1e-4409-bffe-19b77c0f2fc0@oss.qualcomm.com> (raw)
In-Reply-To: <7f99fda6f99d6053db240f2f1ba4d7b71da72261.1792852079.git.me@michaelmcallister.org>
On 10/24/26 4:27 PM, Michael McAllister wrote:
> The MDSS node is missing DISP_CC_MDSS_AHB_CLK. Although the DPU child
> already requests this clock, MDSS resumes before the child enables it.
> The MDSS hardware-version register can then read as zero, causing
> msm_mdss_enable() to skip UBWC configuration.
>
> On the Motorola Moto G10 (SM4250), this results in garbled compressed
> scanout after display power cycling. Adding the clock restores the
> UBWC configuration and makes compressed and linear scanout agree.
>
> Include the DISPCC AHB clock in the MDSS clock list so that its existing
> bulk clock handling enables it before accessing the MDSS registers.
>
> Fixes: 705e50427d81 ("arm64: dts: qcom: sm6115: Add mdss/dpu node")
> Cc: stable@vger.kernel.org
>
> Signed-off-by: Michael McAllister <me@michaelmcallister.org>
> ---
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Konrad
next prev parent reply other threads:[~2026-10-26 12:57 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-24 14:27 [PATCH 0/2] Fix SM6115 MDSS register access during runtime resume Michael McAllister
2026-10-24 14:27 ` [PATCH 1/2] dt-bindings: display: msm: sm6115-mdss: Add missing AHB clock Michael McAllister
2026-10-26 12:40 ` Krzysztof Kozlowski
2026-10-24 14:27 ` [PATCH 2/2] arm64: dts: qcom: sm6115: Add missing MDSS " Michael McAllister
2026-10-26 12:57 ` Konrad Dybcio [this message]
2026-10-26 21:46 ` [PATCH v2 0/2] Fix SM6115 MDSS register access during runtime resume Michael McAllister
2026-10-26 21:46 ` [PATCH v2 1/2] dt-bindings: display: msm: sm6115-mdss: Add missing AHB clock Michael McAllister
2026-10-26 21:46 ` [PATCH v2 2/2] arm64: dts: qcom: sm6115: Add missing MDSS " Michael McAllister
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