linux-kernel - Re: [PATCH 1/2] clk: qcom: gcc-sc7180: Keep USB GDSC power domain on when USB wakeup is enabled

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Date:   Tue, 23 Aug 2022 12:05:31 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Stephen Boyd <sboyd@...nel.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Michael Turquette <mturquette@...libre.com>,
        linux-arm-msm@...r.kernel.org,
        Johan Hovold <johan+linaro@...nel.org>,
        Douglas Anderson <dianders@...omium.org>,
        Krishna Kurapati <quic_kriskura@...cinc.com>,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Subject: Re: [PATCH 1/2] clk: qcom: gcc-sc7180: Keep USB GDSC power domain on
 when USB wakeup is enabled

Hi Stephen,

On Mon, Aug 22, 2022 at 04:52:05PM -0700, Stephen Boyd wrote:
> Quoting Matthias Kaehlcke (2022-08-22 11:53:10)
> > Set GENPD_FLAG_ACTIVE_WAKEUP for the USB GDSC power domain of SC7180.
> 
> Why? Does it fix something? Please add details to the commit text so we
> know how urgent of a patch it is and why it is important.

Without it USB is broken after resume when the PHYs remain enabled
during suspend.

Johan just sent a patch [1] that always disables the PHYs (again)
during system suspend, with that this series shouldn't be needed.
It is possible that in the future we add a mechanism to keep the
PHYs on depending on some config option (quick, kconfig, ...). If
that happens we'll have to revisit this series, for now it
shouldn't be needed assuming Johan's patch gets landed.

[1] https://patchwork.kernel.org/project/linux-usb/patch/20220823124047.14634-1-johan+linaro@kernel.org/