linux-kernel - Re: [PATCH v2 1/3] clk: rockchip: rk3399: make CPU clocks critical

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Date:   Mon, 13 Sep 2021 12:52:50 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     Brian Norris <briannorris@...omium.org>,
        Heiko Stuebner <heiko@...ech.de>
Cc:     Doug Anderson <dianders@...omium.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/3] clk: rockchip: rk3399: make CPU clocks critical

On Thu, Sep 9, 2021 at 3:44 AM Doug Anderson <dianders@...omium.org> wrote:
>
> Hi,
>
> On Wed, Sep 8, 2021 at 11:14 AM Brian Norris <briannorris@...omium.org> wrote:
> >
> > The CPU clocks don't currently have any owner (e.g., cpufreq-dt doesn't
> > enable() them -- and even if it did, it's not early enough compared to
> > other consumers -- nor does arch/arm64/kernel/smp.c), and instead are
> > simply assumed to be "on" all the time.
> >
> > They are also parents of a few other clocks which haven't been
> > previously exposed for other devices to consume. If we want to expose
> > those clocks, then the common clock framework may eventually choose to
> > disable their parents (including the CPU PLLs) -- which is no fun for
> > anyone.
> >
> > Thus, mark the CPU clocks as critical, to prevent them from being
> > disabled implicitly.
> >
> > Signed-off-by: Brian Norris <briannorris@...omium.org>
> > ---
> >
> > Changes in v2:
> >   - New, split from the patch that requires this change
> >
> >  drivers/clk/rockchip/clk-rk3399.c | 11 +++++++----
> >  1 file changed, 7 insertions(+), 4 deletions(-)
>
> Reviewed-by: Douglas Anderson <dianders@...omium.org>

Reviewed-by: Chen-Yu Tsai <wenst@...omium.org>