linux-kernel - Re: [PATCH 3/3] arm64: dts: qcom: sc7280: Add MDSS

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Message-ID: <61a781d3-eb4f-4c56-8873-41c95999630f@oss.qualcomm.com>
Date: Tue, 12 Aug 2025 10:48:24 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Bjorn Andersson <bjorn.andersson@....qualcomm.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd
 <sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>,
        cros-qcom-dts-watchers@...omium.org,
        Konrad Dybcio <konradybcio@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] arm64: dts: qcom: sc7280: Add MDSS_CORE reset to mdss

On 8/12/25 5:11 AM, Bjorn Andersson wrote:
> Like on other platforms, if the OS does not support recovering the state
> left by the bootloader it needs access to MDSS_CORE, so that it can
> clear the MDSS configuration.
> 
> Until now it seems no version of the bootloaders have done so, but e.g.
> the Particle Tachyon ships with a bootloader that does leave the display
> in a state that results in a series of iommu faults.
> 
> So let's provide the reset, to allow the OS to clear that state.
> 
> Signed-off-by: Bjorn Andersson <bjorn.andersson@....qualcomm.com>
> ---

Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>

Konrad