linux-kernel - Re: [PATCH 13/13] phy: qcom-qmp-usb: drop power-down delay config

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Date:   Tue, 11 Oct 2022 17:05:47 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Johan Hovold <johan+linaro@...nel.org>,
        Vinod Koul <vkoul@...nel.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 13/13] phy: qcom-qmp-usb: drop power-down delay config

On 11/10/2022 16:14, Johan Hovold wrote:
> The power-down delay was included in the first version of the QMP driver
> as an optional delay after powering on the PHY (using
> POWER_DOWN_CONTROL) and just before starting it. Later changes modified
> this sequence by powering on before initialising the PHY, but the
> optional delay stayed where it was (i.e. before starting the PHY).
> 
> The vendor driver does not use a delay before starting the PHY and this
> is likely not needed on any platform unless there is a corresponding
> delay in the vendor kernel init sequence tables (i.e. in devicetree).
> 
> Let's keep the delay for now, but drop the redundant delay period
> configuration while increasing the unnecessarily low timer slack
> somewhat.
> 
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> ---
>   drivers/phy/qualcomm/phy-qcom-qmp-usb.c | 35 +------------------------
>   1 file changed, 1 insertion(+), 34 deletions(-)

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

-- 
With best wishes
Dmitry