linux-kernel - Re: [PATCH] arm64: dts: qcom: sc8280xp: Vote for CX in USB controllers

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Date:   Thu, 12 Jan 2023 16:49:33 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Bjorn Andersson <quic_bjorande@...cinc.com>
Cc:     Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Johan Hovold <johan+linaro@...nel.org>
Subject: Re: [PATCH] arm64: dts: qcom: sc8280xp: Vote for CX in USB
 controllers

On Thu, Jan 12, 2023 at 05:51:17AM -0800, Bjorn Andersson wrote:
> Running GCC_USB30_*_MASTER_CLK at 200MHz requires CX at nominal level,
> not doing so results in occasional lockups. This was previously hidden
> by the fact that the display stack incorrectly voted for CX (instead of
> MMCX).
> 
> Fixes: 152d1faf1e2f ("arm64: dts: qcom: add SC8280XP platform")
> Signed-off-by: Bjorn Andersson <quic_bjorande@...cinc.com>
> ---
>  arch/arm64/boot/dts/qcom/sc8280xp.dtsi | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
> index 2ed17baf50d3..4f4353f84cba 100644
> --- a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
> @@ -2265,6 +2265,7 @@ usb_0: usb@...8800 {
>  					  "ss_phy_irq";
>  
>  			power-domains = <&gcc USB30_PRIM_GDSC>;
> +			required-opps = <&rpmhpd_opp_nom>;
>  
>  			resets = <&gcc GCC_USB30_PRIM_BCR>;
>  
> @@ -2319,6 +2320,7 @@ usb_1: usb@...8800 {
>  					  "ss_phy_irq";
>  
>  			power-domains = <&gcc USB30_SEC_GDSC>;
> +			required-opps = <&rpmhpd_opp_nom>;
>  
>  			resets = <&gcc GCC_USB30_SEC_BCR>;

Looks good. Perhaps you can send a binding patch adding 'required-oops'
as well.

Reviewed-by: Johan Hovold <johan+linaro@...nel.org>

Johan