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Message-ID: <b730bf22-fa3a-4720-9fd1-79d2207d6812@linaro.org>
Date: Fri, 29 Dec 2023 14:06:26 +0100
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Subject: Re: [PATCH 2/3] arm64: dts: qcom: sc8280xp: Correct USB PHY power
 domains
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To: Johan Hovold <johan@kernel.org>
Cc: Bjorn Andersson <andersson@kernel.org>, Rob Herring <robh+dt@kernel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
 Conor Dooley <conor+dt@kernel.org>, Johan Hovold <johan+linaro@kernel.org>,
 Marijn Suijten <marijn.suijten@somainline.org>,
 linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,
 linux-kernel@vger.kernel.org,
 Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
 Konrad Dybcio <konrad.dybcio@somainline.org>
References: <20231227-topic-8280_pcie_dts-v1-0-13d12b1698ff@linaro.org>
 <20231227-topic-8280_pcie_dts-v1-2-13d12b1698ff@linaro.org>
 <ZY7DEpaIgvfL_A11@hovoldconsulting.com>
From: Konrad Dybcio <konrad.dybcio@linaro.org>
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In-Reply-To: <ZY7DEpaIgvfL_A11@hovoldconsulting.com>
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On 29.12.2023 14:01, Johan Hovold wrote:
> On Wed, Dec 27, 2023 at 11:28:27PM +0100, Konrad Dybcio wrote:
>> The USB GDSCs are only related to the controllers.
> 
> Are you sure?
That's what I've been told from rather reliable sources.

> 
>> The PHYs on the other
>> hand, are powered by VDD_MX and their specific VDDA_PHY/PLL regulators.
>>
>> Fix the power-domains assignment to stop potentially toggling the GDSC
>> unnecessarily.
> 
> Again, there's no additional toggling being done here, but yes, this may
> keep the domains enabled during suspend depending on how the driver is
> implemented.
No, it can actually happen. (Some) QMP PHYs are referenced by the
DP hardware. If USB is disabled (or suspended), the DP being active
will hold these GDSCs enabled.

Konrad
> If that's the concern, then please spell that out too.
> 
>> Fixes: 152d1faf1e2f ("arm64: dts: qcom: add SC8280XP platform")
> 
> May not be needed either.
> 
>> @@ -2597,7 +2597,7 @@ usb_2_qmpphy0: phy@88ef000 {
>>  				 <&gcc GCC_USB3UNIPHY_PHY_MP0_BCR>;
>>  			reset-names = "phy", "phy_phy";
>>  
>> -			power-domains = <&gcc USB30_MP_GDSC>;
>> +			power-domains = <&rpmhpd SC8280XP_MX>;
> 
> Johan