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 14:41:02 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     Nicolas Pitre <npitre@...libre.com>
Cc:     "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

Hi Nicolas,

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

Steps to reproduce:
---------------------------
1)

# TuxMake is a command line tool and Python library that provides
# portable and repeatable Linux kernel builds across a variety of
# architectures, toolchains, kernel configurations, and make targets.
#
# TuxMake supports the concept of runtimes.
# See https://docs.tuxmake.org/runtimes/, for that to work it requires
# that you install podman or docker on your system.
#
# To install tuxmake on your system globally:
# sudo pip3 install -U tuxmake
#
# See https://docs.tuxmake.org/ for complete documentation.

tuxmake --runtime docker --target-arch arm --toolchain gcc-8 --kconfig
omap1_defconfig

2)
tuxbuild build --git-repo
https://gitlab.com/Linaro/lkft/mirrors/next/linux-next --git-sha
bc085f8fc88fc16796c9f2364e2bfb3fef305cad --target-arch arm --toolchain
gcc-8 --kconfig omap1_defconfig

-- 
Linaro LKFT
https://lkft.linaro.org