linux-kernel - Re: [PATCH 1/3] clk: qcom: gcc-msm8998: Mark hmss_dvm and lpass

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Date:   Thu, 29 Nov 2018 23:24:20 -0800
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Stephen Boyd <sboyd@...nel.org>
Cc:     Michael Turquette <mturquette@...libre.com>,
        Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        Marc Gonzalez <marc.w.gonzalez@...e.fr>,
        Amit Kucheria <amit.kucheria@...aro.org>
Subject: Re: [PATCH 1/3] clk: qcom: gcc-msm8998: Mark hmss_dvm and lpass_at
 critical

On Thu 29 Nov 23:05 PST 2018, Stephen Boyd wrote:

> Quoting Bjorn Andersson (2018-11-29 22:52:57)
> > Keep the two clocks enabled, so that the platform passes
> > clk_disable_unused().
> > 
> > Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> > ---
> >  drivers/clk/qcom/gcc-msm8998.c | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/drivers/clk/qcom/gcc-msm8998.c b/drivers/clk/qcom/gcc-msm8998.c
> > index 9f0ae403d5f5..d89f8e7c2a59 100644
> > --- a/drivers/clk/qcom/gcc-msm8998.c
> > +++ b/drivers/clk/qcom/gcc-msm8998.c
> > @@ -1972,6 +1972,7 @@ static struct clk_branch gcc_hmss_dvm_bus_clk = {
> >                 .enable_mask = BIT(0),
> >                 .hw.init = &(struct clk_init_data){
> >                         .name = "gcc_hmss_dvm_bus_clk",
> > +                       .flags = CLK_IS_CRITICAL,
> 
> Please add a comment about why they're critical. This is a temporary
> solution?
> 

Disabling them in clk_disable_unused() are bad, mkay...


SDM845 marks the equivalent clocks as critical with a comment that they
must be on for system operation... I'm uncertain what the exact purpose
of these two clocks are, so I don't have a better explanation right now.

Regards,
Bjorn

> >                         .ops = &clk_branch2_ops,
> >                 },
> >         },