linux-kernel - Re: [PATCH] clk: qcom: Make gcc_gpu_cfg_ahb

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Message-ID: <CAOCk7NpZmH8XahFmcKXSGsbT2nrY7kuWftGW1Ss6NdkqGs08cA@mail.gmail.com>
Date:   Thu, 19 Dec 2019 07:20:23 -0700
From:   Jeffrey Hugo <jeffrey.l.hugo@...il.com>
To:     Stephen Boyd <sboyd@...nel.org>
Cc:     Michael Turquette <mturquette@...libre.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        MSM <linux-arm-msm@...r.kernel.org>, linux-clk@...r.kernel.org,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] clk: qcom: Make gcc_gpu_cfg_ahb_clk critical

On Wed, Dec 18, 2019 at 11:00 PM Stephen Boyd <sboyd@...nel.org> wrote:
>
> Quoting Jeffrey Hugo (2019-12-17 09:12:05)
> > diff --git a/drivers/clk/qcom/gcc-msm8998.c b/drivers/clk/qcom/gcc-msm8998.c
> > index df1d7056436c..26cc1458ce4a 100644
> > --- a/drivers/clk/qcom/gcc-msm8998.c
> > +++ b/drivers/clk/qcom/gcc-msm8998.c
> > @@ -2044,6 +2044,7 @@ static struct clk_branch gcc_gpu_cfg_ahb_clk = {
> >                 .hw.init = &(struct clk_init_data){
> >                         .name = "gcc_gpu_cfg_ahb_clk",
> >                         .ops = &clk_branch2_ops,
> > +                       .flags = CLK_IS_CRITICAL, /* to access gpucc */
>
> Can we not do the thing that Bjorn did to turn on ahb clks with runtime
> PM for clk controllers that need them? See 892df0191b29 ("clk: qcom: Add
> QCS404 TuringCC").
>

Interesting.  I didn't think of that solution, nor was I aware of that
change.  Let me have a look.  Thanks for the tip.