linux-kernel - Re: [PATCH] needsreview! arm64: dts: qcom: sdm845: Add missing MDSS reset

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Message-ID: <654126da-3cdb-465e-82a9-cbeb1b46a657@ixit.cz>
Date: Mon, 12 Jan 2026 13:36:49 +0100
From: David Heidelberg <david@...t.cz>
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>
Cc: Petr Hodina <petr.hodina@...tonmail.com>, linux-arm-msm@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 phone-devel@...r.kernel.org
Subject: Re: [PATCH] needsreview! arm64: dts: qcom: sdm845: Add missing MDSS
 reset

Seeing the $subj, I asking myself why do I use `b4 --reflect`...

Anyway, if the patch will be good enough, feel free to strip 
`needsreview!`, or I'll sent v2 ;-)

David

On 12/01/2026 13:33, David Heidelberg via B4 Relay wrote:
> From: David Heidelberg <david@...t.cz>
> 
> If the OS does not support recovering the state left by the
> bootloader it needs a way to reset display hardware, so that it can
> start from a clean state. Add a reference to the relevant reset.
> 
> Signed-off-by: David Heidelberg <david@...t.cz>
> ---
> It efficiently fixes nothing for us (at least what we're aware), so I
> assume the state left by bootloader is good enough
> 
> I sending this as a something "which seems right" and works for us in
> sdm845-next tree.
> 
> David
> ---
>   arch/arm64/boot/dts/qcom/sdm845.dtsi | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> index bf2f9c04adba7..75c192eddc57c 100644
> --- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> @@ -4550,6 +4550,7 @@ mdss: display-subsystem@...0000 {
>   			reg-names = "mdss";
>   
>   			power-domains = <&dispcc MDSS_GDSC>;
> +			resets = <&dispcc DISP_CC_MDSS_RSCC_BCR>;
>   
>   			clocks = <&dispcc DISP_CC_MDSS_AHB_CLK>,
>   				 <&dispcc DISP_CC_MDSS_MDP_CLK>;
> 
> ---
> base-commit: f417b7ffcbef7d76b0d8860518f50dae0e7e5eda
> change-id: 20260112-mdss-reset-06988f05af96
> 
> Best regards,

-- 
David Heidelberg