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

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Message-ID: <154356557630.88331.15462727905875864666@swboyd.mtv.corp.google.com>
Date:   Fri, 30 Nov 2018 00:12:56 -0800
From:   Stephen Boyd <sboyd@...nel.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.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

Quoting Bjorn Andersson (2018-11-29 23:24:20)
> 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...

Ugh sad.

> 
> 
> 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.
> 

Ok. But does any driver ever want to use it? It may make more sense to
just remove it entirely and not touch it.