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

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Date:   Mon, 7 Nov 2022 06:09:12 -0500
From:   Brian Masney <bmasney@...hat.com>
To:     Johan Hovold <johan+linaro@...nel.org>
Cc:     Bjorn Andersson <andersson@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        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 Fri, Nov 04, 2022 at 10:20:44AM +0100, 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: Brian Masney <bmasney@...hat.com>

Note that there was no 5.20 kernel; that should be 6.0. Bjorn should be
able to fix this up during merge.

https://en.wikipedia.org/wiki/Linux_kernel_version_history