linux-kernel - Re: [PATCH] Revert "clk: gcc-sc8280xp: keep PCIe power-domains always-on"

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Message-ID: <20230706135434.GE4808@thinkpad>
Date:   Thu, 6 Jul 2023 19:24:34 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Johan Hovold <johan@...nel.org>
Cc:     andersson@...nel.org, mturquette@...libre.com, sboyd@...nel.org,
        konrad.dybcio@...aro.org, johan+linaro@...nel.org,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Revert "clk: gcc-sc8280xp: keep PCIe power-domains
 always-on"

On Thu, Jul 06, 2023 at 03:38:22PM +0200, Johan Hovold wrote:
> On Thu, Jul 06, 2023 at 06:17:00PM +0530, Manivannan Sadhasivam wrote:
> > This reverts commit 12d2a4769380f0dc9ba6f827839869db2b81ef00.
> 
> Please update the commit summary and remove or rephrase the above as
> direct reverts are typically used for patches that were broken or causes
> trouble (e.g rephrase as "allow pcie gdsdc to be disabled" or similar).
> 
> The patch in question was correct at the time even if it may no longer
> be required, but see below.
> 

Ok!

> > With the minimal system suspend support in place for the PCIe driver that
> > keeps the interconnect path active, the ALWAYS_ON flags can now be dropped.
> > 
> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > ---
> >  drivers/clk/qcom/gcc-sc8280xp.c | 14 +++++---------
> >  1 file changed, 5 insertions(+), 9 deletions(-)
> > 
> > diff --git a/drivers/clk/qcom/gcc-sc8280xp.c b/drivers/clk/qcom/gcc-sc8280xp.c
> > index 04a99dbaa57e..07eb6110442c 100644
> > --- a/drivers/clk/qcom/gcc-sc8280xp.c
> > +++ b/drivers/clk/qcom/gcc-sc8280xp.c
> > @@ -6774,10 +6774,6 @@ static struct gdsc pcie_1_tunnel_gdsc = {
> >  	.flags = VOTABLE,
> >  };
> >  
> > -/*
> > - * The Qualcomm PCIe driver does not yet implement suspend so to keep the
> > - * PCIe power domains always-on for now.
> > - */
> >  static struct gdsc pcie_2a_gdsc = {
> >  	.gdscr = 0x9d004,
> >  	.collapse_ctrl = 0x52128,
> > @@ -6786,7 +6782,7 @@ static struct gdsc pcie_2a_gdsc = {
> >  		.name = "pcie_2a_gdsc",
> >  	},
> >  	.pwrsts = PWRSTS_OFF_ON,
> > -	.flags = VOTABLE | ALWAYS_ON,
> > +	.flags = VOTABLE,
> >  };
> 
> Are you sure this is correct? Won't the controller state be lost if the
> GDSC is powered off during suspend? Shouldn't this be PWRSTS_RET_ON at
> least?
> 

Doh! Yes, I missed that. Will add it in v2.

- Mani

> Johan

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