linux-kernel - Re: [PATCH] PM / clk: make PM clock layer compatible with clocks that must sleep

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Date:   Thu, 21 Jan 2021 17:39:39 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Nicolas Pitre <npitre@...libre.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Linux PM <linux-pm@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Mark Brown <broonie@...nel.org>, Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] PM / clk: make PM clock layer compatible with clocks that
 must sleep

On Thu, 21 Jan 2021 at 16:28, Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> On Thu, Jan 21, 2021 at 10:13 AM Naresh Kamboju
> <naresh.kamboju@...aro.org> wrote:
> > On Tue, 5 Jan 2021 at 08:48, Nicolas Pitre <npitre@...libre.com> wrote:
> > >
> > > The clock API splits its interface into sleepable ant atomic contexts:
> > >
> > > - clk_prepare/clk_unprepare for stuff that might sleep
> > >
> > > - clk_enable_clk_disable for anything that may be done in atomic context
> > >
> >
> > <trim>
> >
> > >
> > > Signed-off-by: Nicolas Pitre <npitre@...libre.com>
> > >
> > > diff --git a/drivers/base/power/clock_ops.c b/drivers/base/power/clock_ops.c
> > > index ced6863a16..a62fb0f9b1 100644
> > > --- a/drivers/base/power/clock_ops.c
> > > +++ b/drivers/base/power/clock_ops.c
> >
> > <trim>
> >
> > > @@ -64,17 +166,20 @@ static void pm_clk_acquire(struct device *dev, struct pm_clock_entry *ce)
> > >                 ce->clk = clk_get(dev, ce->con_id);
> > >         if (IS_ERR(ce->clk)) {
> > >                 ce->status = PCE_STATUS_ERROR;
> > > +               return;
> > > +       } else if (clk_is_enabled_when_prepared(ce->clk)) {
> >
> > arm-linux-gnueabihf-ld: drivers/base/power/clock_ops.o: in function
> > `pm_clk_acquire':
> > drivers/base/power/clock_ops.c:170: undefined reference to
> > `clk_is_enabled_when_prepared'
> >
> > Reported-by: Naresh Kamboju <naresh.kamboju@...aro.org>
> >
> > This build error was noticed on arm architecture on linux next 20210121 tag.
> > Following builds failed.
> >  - arm (omap1_defconfig) with clang-10 - FAILED
> >  - arm (omap1_defconfig) with clang-11 - FAILED
> >
> >  - arm (omap1_defconfig) with gcc-8 - FAILED
> >  - arm (omap1_defconfig) with gcc-9 - FAILED
> >  - arm (omap1_defconfig) with gcc-10 - FAILED
>
> Missing dummy clk_is_enabled_when_prepared() for the
> !CONFIG_HAVE_CLK case?

I see these configs enabled in failed builds config file,

CONFIG_HAVE_CLK=y
CONFIG_CLKDEV_LOOKUP=y
CONFIG_HAVE_LEGACY_CLK=y

ref:
https://builds.tuxbuild.com/1nN0vkpNP4qhvIuIJN12j7tTpQs/

- Naresh