linux-kernel - Re: [PATCH v3 15/18] arm64: dts: qcom: Add MXC power domain to videocc node on SM8650

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Message-ID: <7af5a2a5-6eac-4734-aa20-3e0f2141afef@quicinc.com>
Date: Fri, 11 Apr 2025 12:57:55 +0530
From: Jagadeesh Kona <quic_jkona@...cinc.com>
To: Konrad Dybcio <konrad.dybcio@....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>,
        Konrad Dybcio
	<konradybcio@...nel.org>,
        Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>,
        Dmitry Baryshkov <lumag@...nel.org>
CC: Ajit Pandey <quic_ajipan@...cinc.com>,
        Imran Shaik
	<quic_imrashai@...cinc.com>,
        Taniya Das <quic_tdas@...cinc.com>,
        "Satya Priya
 Kakitapalli" <quic_skakitap@...cinc.com>,
        <linux-arm-msm@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Krzysztof Kozlowski
	<krzysztof.kozlowski@...aro.org>,
        Bryan O'Donoghue
	<bryan.odonoghue@...aro.org>
Subject: Re: [PATCH v3 15/18] arm64: dts: qcom: Add MXC power domain to
 videocc node on SM8650



On 4/1/2025 9:30 PM, Konrad Dybcio wrote:
> On 4/1/25 5:27 PM, Konrad Dybcio wrote:
>> On 3/27/25 10:52 AM, Jagadeesh Kona wrote:
>>> Videocc requires both MMCX and MXC rails to be powered ON to configure
>>> the video PLLs on SM8650 platform. Hence add MXC power domain to videocc
>>> node on SM8650.
>>>
>>> Signed-off-by: Jagadeesh Kona <quic_jkona@...cinc.com>
>>> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
>>> Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
>>> ---
>>>  arch/arm64/boot/dts/qcom/sm8650.dtsi | 3 ++-
>>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/arch/arm64/boot/dts/qcom/sm8650.dtsi b/arch/arm64/boot/dts/qcom/sm8650.dtsi
>>> index 818db6ba3b3be99c187512ea4acf2004422f6a18..ad60596b71d25bb0198b26660dc41195a1210a23 100644
>>> --- a/arch/arm64/boot/dts/qcom/sm8650.dtsi
>>> +++ b/arch/arm64/boot/dts/qcom/sm8650.dtsi
>>> @@ -4959,7 +4959,8 @@ videocc: clock-controller@...0000 {
>>>  			reg = <0 0x0aaf0000 0 0x10000>;
>>>  			clocks = <&bi_tcxo_div2>,
>>>  				 <&gcc GCC_VIDEO_AHB_CLK>;
>>> -			power-domains = <&rpmhpd RPMHPD_MMCX>;
>>> +			power-domains = <&rpmhpd RPMHPD_MMCX>,
>>> +					<&rpmhpd RPMHPD_MXC>;
>>
>> So all other DTs touched in this series reference low_svs in required-opps
> 
> actually "all" is wrong on my side, please also consider and if necessary apply
> the same change to patch 18
> 
> Konrad
>
It is not needed for SM8650. In the initial SM8650 videocc and camcc series,
required-opps was added for MMCX. But it was dropped based on the review comments
in that series, after confirming that minimum non-zero level from cmd-db on MMCX
is > retention on SM8650. And as mentioned here[1], required-opps is not mandatory
for MXC as well.

[1]: https://lore.kernel.org/all/44dad3b5-ea3d-47db-8aca-8f67294fced9@quicinc.com/

Thanks,
Jagadeesh

>>
>> Is that an actual requirement? Otherwise since Commit e3e56c050ab6
>> ("soc: qcom: rpmhpd: Make power_on actually enable the domain") we get the
>> first nonzero state, which can be something like low_svs_d2
>>
>> Konrad