linux-kernel - Re: [PATCH v6 5/5] clk: qcom: Alwaya on pcie gdsc

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Date:   Tue, 13 Sep 2022 22:12:33 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Rajendra Nayak <quic_rjendra@...cinc.com>
Cc:     Krishna chaitanya chundru <quic_krichai@...cinc.com>,
        helgaas@...nel.org, linux-pci@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        mka@...omium.org, quic_vbadigan@...cinc.com,
        quic_hemantk@...cinc.com, quic_nitegupt@...cinc.com,
        quic_skananth@...cinc.com, quic_ramkri@...cinc.com,
        swboyd@...omium.org, dmitry.baryshkov@...aro.org,
        Bjorn Andersson <andersson@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        "open list:COMMON CLK FRAMEWORK" <linux-clk@...r.kernel.org>
Subject: Re: [PATCH v6 5/5] clk: qcom: Alwaya on pcie gdsc

On Tue, Sep 13, 2022 at 12:12:32PM +0530, Rajendra Nayak wrote:
> 
> On 9/12/2022 10:34 PM, Manivannan Sadhasivam wrote:
> > + Rajendra
> > 
> > On Fri, Sep 09, 2022 at 02:14:44PM +0530, Krishna chaitanya chundru wrote:
> > > Make GDSC always on to ensure controller and its dependent clocks
> > > won't go down during system suspend.
> > > 
> > 
> > You need to mention the SoC name in subject, otherwise one cannot know for
> > which platform this patch applies to.
> > 
> > > Signed-off-by: Krishna chaitanya chundru <quic_krichai@...cinc.com>
> > > ---
> > >   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 7ff64d4..2f781a2 100644
> > > --- a/drivers/clk/qcom/gcc-sc7280.c
> > > +++ b/drivers/clk/qcom/gcc-sc7280.c
> > > @@ -3109,7 +3109,7 @@ static struct gdsc gcc_pcie_1_gdsc = {
> > >   		.name = "gcc_pcie_1_gdsc",
> > >   	},
> > >   	.pwrsts = PWRSTS_OFF_ON,
> > > -	.flags = VOTABLE,
> > > +	.flags = ALWAYS_ON,
> > 
> > Rajendra, should we also put PCIe GDSC into retention state as you have done for
> > USB [1]?
> 
> Yes, it looks like we should handle this the same way as we did with usb.

Okay, thanks for the confirmation.

> Why are we removing the VOTABLE flag anyway?

Yeah, I don't see a reason for doing that.

Chaitanya, please follow the patch from Rajendra I mentioned above and adapt it
for PCIe GDSC.

Thanks,
Mani

> 
> > 
> > Thanks,
> > Mani
> > 
> > [1] https://lore.kernel.org/all/20220901101756.28164-2-quic_rjendra@quicinc.com/
> > 
> > >   };
> > >   static struct gdsc gcc_ufs_phy_gdsc = {
> > > -- 
> > > 2.7.4
> > > 
> >