Re: [PATCH v2 3/3] arm64: dts: qcom: Add INT2 GDSC to Kaanapali DPU

[Yongxing Mou <yongxing.mou@oss.qualcomm.com>]

On 10/5/2026 9:06 AM, Dmitry Baryshkov wrote:
> On Tue, Sep 15, 2026 at 05:27:50PM +0800, Yongxing Mou wrote:
>> The INT2 GDSC on Kaanapali (SM8850) powers a subset of the DPU
>> source pipes (VIG2/VIG3/DMA5). Add it as a second power domain of
>> the display-controller (DPU) node, alongside the existing MMCX
>> performance-state power domain.
>>
>> The MDSS node's CORE_GDSC is unaffected, since it continues to power
>> the rest of the MDSS hardware on its own.
>>
>> Signed-off-by: Yongxing Mou <yongxing.mou@oss.qualcomm.com>
>> ---
>>   arch/arm64/boot/dts/qcom/kaanapali.dtsi | 4 +++-
>>   1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/kaanapali.dtsi b/arch/arm64/boot/dts/qcom/kaanapali.dtsi
>> index ace19b8b12d7..b3e3cd1d311c 100644
>> --- a/arch/arm64/boot/dts/qcom/kaanapali.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/kaanapali.dtsi
>> @@ -3619,7 +3619,9 @@ mdss_mdp: display-controller@9801000 {
>>   
>>   				operating-points-v2 = <&mdp_opp_table>;
>>   
>> -				power-domains = <&rpmhpd RPMHPD_MMCX>;
>> +				power-domains = <&rpmhpd RPMHPD_MMCX>,
> 
> Should it continue to be RPMHPD_MMCX or should it become
> DISP_CC_MDSS_CORE_GDSC?
> 
It should remain RPMHPD_MMCX, as this power domain is used by the DPU 
OPP table for performance-state voting.

DISP_CC_MDSS_CORE_GDSC remains attached to the parent MDSS device 
because it supplies hardware shared across the MDSS subsystem. Since the 
DPU is a child of MDSS, it inherits access to this power domain through 
the parent-child runtime PM hierarchy.

Only INT2 is attached directly to the DPU, as it exclusively powers a 
subset of the DPU source pipes.

>> +						<&dispcc DISP_CC_MDSS_CORE_INT2_GDSC>;
>> +				power-domain-names = "mmcx", "int2";
>>   
>>   				ports {
>>   					#address-cells = <1>;
>>
>> -- 
>> 2.43.0
>>
>