linux-kernel - Re: [PATCH 1/2] arm64: dts: qcom: sc8280xp: fix UFS reference clocks

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Date:   Fri, 4 Nov 2022 10:43:49 +0100
From:   Konrad Dybcio <konrad.dybcio@...ainline.org>
To:     Johan Hovold <johan+linaro@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>
Cc:     Andy Gross <agross@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Brian Masney <bmasney@...hat.com>,
        Shazad Hussain <quic_shazhuss@...cinc.com>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 1/2] arm64: dts: qcom: sc8280xp: fix UFS reference clocks


On 04/11/2022 10:20, Johan Hovold wrote:
> There are three UFS reference clocks on SC8280XP which are used as
> follows:
>
>   - The GCC_UFS_REF_CLKREF_CLK clock is fed to any UFS device connected
>     to either controller.
>
>   - The GCC_UFS_1_CARD_CLKREF_CLK and GCC_UFS_CARD_CLKREF_CLK clocks
>     provide reference clocks to the two PHYs.
>
> Note that this depends on first updating the clock driver to reflect
> that all three clocks are sourced from CXO. Specifically, the UFS
> controller driver expects the device reference clock to have a valid
> frequency:
>
> 	ufshcd-qcom 1d84000.ufs: invalid ref_clk setting = 0
>
> Fixes: 152d1faf1e2f ("arm64: dts: qcom: add SC8280XP platform")
> Fixes: 8d6b458ce6e9 ("arm64: dts: qcom: sc8280xp: fix ufs_card_phy ref clock")
> Fixes: f3aa975e230e ("arm64: dts: qcom: sc8280xp: correct ref clock for ufs_mem_phy")
> Link: https://lore.kernel.org/lkml/Y2OEjNAPXg5BfOxH@hovoldconsulting.com/
> Cc: stable@...r.kernel.org	# 5.20
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> ---

Reviewed-by: Konrad Dybcio <konrad.dybcio@...ainline.org>


Konrad

>   arch/arm64/boot/dts/qcom/sc8280xp.dtsi | 8 ++++----
>   1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
> index 21ac119e0382..e0d0fb6994b5 100644
> --- a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
> @@ -912,7 +912,7 @@ ufs_mem_hc: ufs@...4000 {
>   				 <&gcc GCC_AGGRE_UFS_PHY_AXI_CLK>,
>   				 <&gcc GCC_UFS_PHY_AHB_CLK>,
>   				 <&gcc GCC_UFS_PHY_UNIPRO_CORE_CLK>,
> -				 <&rpmhcc RPMH_CXO_CLK>,
> +				 <&gcc GCC_UFS_REF_CLKREF_CLK>,
>   				 <&gcc GCC_UFS_PHY_TX_SYMBOL_0_CLK>,
>   				 <&gcc GCC_UFS_PHY_RX_SYMBOL_0_CLK>,
>   				 <&gcc GCC_UFS_PHY_RX_SYMBOL_1_CLK>;
> @@ -943,7 +943,7 @@ ufs_mem_phy: phy@...7000 {
>   			ranges;
>   			clock-names = "ref",
>   				      "ref_aux";
> -			clocks = <&gcc GCC_UFS_REF_CLKREF_CLK>,
> +			clocks = <&gcc GCC_UFS_CARD_CLKREF_CLK>,
>   				 <&gcc GCC_UFS_PHY_PHY_AUX_CLK>;
>   
>   			resets = <&ufs_mem_hc 0>;
> @@ -980,7 +980,7 @@ ufs_card_hc: ufs@...4000 {
>   				 <&gcc GCC_AGGRE_UFS_CARD_AXI_CLK>,
>   				 <&gcc GCC_UFS_CARD_AHB_CLK>,
>   				 <&gcc GCC_UFS_CARD_UNIPRO_CORE_CLK>,
> -				 <&rpmhcc RPMH_CXO_CLK>,
> +				 <&gcc GCC_UFS_REF_CLKREF_CLK>,
>   				 <&gcc GCC_UFS_CARD_TX_SYMBOL_0_CLK>,
>   				 <&gcc GCC_UFS_CARD_RX_SYMBOL_0_CLK>,
>   				 <&gcc GCC_UFS_CARD_RX_SYMBOL_1_CLK>;
> @@ -1011,7 +1011,7 @@ ufs_card_phy: phy@...7000 {
>   			ranges;
>   			clock-names = "ref",
>   				      "ref_aux";
> -			clocks = <&gcc GCC_UFS_REF_CLKREF_CLK>,
> +			clocks = <&gcc GCC_UFS_1_CARD_CLKREF_CLK>,
>   				 <&gcc GCC_UFS_CARD_PHY_AUX_CLK>;
>   
>   			resets = <&ufs_card_hc 0>;