linux-kernel - Re: [PATCH 2/2] clk: qcom: gcc-sc7280: Keep USB GDSC power domains on when USB wakeup is enabled

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Message-ID: <YwUDjaG6n95Ddij2@google.com>
Date:   Tue, 23 Aug 2022 09:42:53 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Johan Hovold <johan@...nel.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, 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 2/2] clk: qcom: gcc-sc7280: Keep USB GDSC power domains
 on when USB wakeup is enabled

On Tue, Aug 23, 2022 at 01:16:36PM +0200, Johan Hovold wrote:
> On Mon, Aug 22, 2022 at 11:53:11AM -0700, Matthias Kaehlcke wrote:
> > Set GENPD_FLAG_ACTIVE_WAKEUP for the USB GDSC power domains of SC7280.
> > 
> > Suggested-by: Johan Hovold <johan+linaro@...nel.org>
> > Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> > ---
> > 
> >  drivers/clk/qcom/gcc-sc7280.c | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/drivers/clk/qcom/gcc-sc7280.c b/drivers/clk/qcom/gcc-sc7280.c
> > index 7ff64d4d5920..4ff855269467 100644
> > --- a/drivers/clk/qcom/gcc-sc7280.c
> > +++ b/drivers/clk/qcom/gcc-sc7280.c
> > @@ -3125,6 +3125,7 @@ static struct gdsc gcc_usb30_prim_gdsc = {
> >  	.gdscr = 0xf004,
> >  	.pd = {
> >  		.name = "gcc_usb30_prim_gdsc",
> > +		.flags = GENPD_FLAG_ACTIVE_WAKEUP,
> 
> Have you verified that the power-domain doesn't need to remain on also
> when USB isn't used for wakeup?

So far I haven't observed issues with this on sc7180 and sc7280 when USB
wakeup is disabled.

> This is the case for sc8280xp and indicates that there are further
> missing pieces here (at least for that platform).

What are you observing on sc8280xp when wakeup is disabled?