linux-kernel - Re: [PATCH v2 2/2] clk: qcom: gcc-sc7280: Keep the USB GDSCs always on

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Message-ID: <YwjiyV3yeL7D1mQK@google.com>
Date:   Fri, 26 Aug 2022 08:12:09 -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>,
        Johan Hovold <johan+linaro@...nel.org>,
        linux-clk@...r.kernel.org,
        Krishna Kurapati <quic_kriskura@...cinc.com>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Douglas Anderson <dianders@...omium.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Subject: Re: [PATCH v2 2/2] clk: qcom: gcc-sc7280: Keep the USB GDSCs always
 on

On Fri, Aug 26, 2022 at 09:16:38AM +0200, Johan Hovold wrote:
> On Thu, Aug 25, 2022 at 06:21:59PM -0700, Matthias Kaehlcke wrote:
> > When the GDSC is disabled during system suspend USB is broken on
> > sc7280 when the system resumes. Mark the GDSC as always on to
> > make sure USB still works after system suspend.
> > 
> > Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> > ---
> > 
> > Changes in v2:
> > - set the flags of the GDSC not of the GDSC power domain
> > - updated commit message
> > 
> >  drivers/clk/qcom/gcc-sc7280.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/clk/qcom/gcc-sc7280.c b/drivers/clk/qcom/gcc-sc7280.c
> > index 7ff64d4d5920..adef68d2cb0b 100644
> > --- a/drivers/clk/qcom/gcc-sc7280.c
> > +++ b/drivers/clk/qcom/gcc-sc7280.c
> 
> Perhaps you can add a comment here about why this is needed similar to
> what I did for sc8280xp:
> 
> 	https://lore.kernel.org/all/20220805121250.10347-3-johan+linaro@kernel.org/

>From Bjorn's comment on the sc7180 patch it seems it's not an dwc3
implementation issue. IIUC the GDSCs should have a retention state
that would be used during suspend.

> > @@ -3127,7 +3127,7 @@ static struct gdsc gcc_usb30_prim_gdsc = {
> >  		.name = "gcc_usb30_prim_gdsc",
> >  	},
> >  	.pwrsts = PWRSTS_OFF_ON,
> > -	.flags = VOTABLE,
> > +	.flags = VOTABLE | ALWAYS_ON,
> >  };
> >  
> >  static struct gdsc gcc_usb30_sec_gdsc = {
> 
> Look good otherwise. For both patches:
> 
> Reviewed-by: Johan Hovold <johan+linaro@...nel.org>

Thanks!