linux-kernel - Re: [PATCH] arm64: dts: qcom: sc8280xp: fix ufs_card

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Date:   Thu, 6 Oct 2022 10:38:40 -0400
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>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: sc8280xp: fix ufs_card_phy ref clock

On Wed, Oct 05, 2022 at 04:33:05PM +0200, Johan Hovold wrote:
> The GCC_UFS_REF_CLKREF_CLK must be enabled or the second UFS controller
> fails to enumerate on sa8295p-adp.
> 
> Note that the vendor kernel enables both GCC_UFS_REF_CLKREF_CLK and
> GCC_UFS_1_CARD_CLKREF_CLK and it is possible that the former should be
> modelled as a parent of the latter. The clock driver also has a
> GCC_UFS_CARD_CLKREF_CLK clock which the firmware appears to enable on
> the ADP.
> 
> The usual lack of documentation for Qualcomm SoCs makes this a highly
> annoying guessing game, but as the second controller works on the ADP
> without either card reference clock enabled, only enable
> GCC_UFS_REF_CLKREF_CLK for now.
> 
> Fixes: 152d1faf1e2f ("arm64: dts: qcom: add SC8280XP platform")
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>

Reviewed-by: Brian Masney <bmasney@...hat.com>