Re: [PATCH 3/4] arm64: dts: qcom: sdm845: Add missing MDSS reset

[David Heidelberg <david@ixit.cz>]

On 18/02/2026 11:30, Konrad Dybcio wrote:
> On 2/17/26 10:20 PM, Dmitry Baryshkov wrote:
>> From: David Heidelberg <david@ixit.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.
> 
> This is not the relevant reset
> 
> You want MDSS_CORE_BCR @ 0xaf0_2000

Thanks, I prepared the fixes [1].

I'll try to test it if it's not breaking anything for us and send as v2 
of [2].

David

[1] https://codeberg.org/sdm845/linux/commits/branch/b4/mdss-reset
[2] 
https://patchwork.kernel.org/project/linux-arm-msm/patch/20260112-mdss-reset-v1-1-af7c572204d3@ixit.cz/

> 
> Konrad
> 
>>
>> Signed-off-by: David Heidelberg <david@ixit.cz>
>> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
>> ---
> 
> 
>>   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 bf2f9c04adba..75c192eddc57 100644
>> --- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
>> @@ -4550,6 +4550,7 @@ mdss: display-subsystem@ae00000 {
>>   			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>;
>>

-- 
David Heidelberg