linux-kernel - Re: [PATCH 1/2] host: ehci-exynos: Convert to use the SET_SYSTEM_SLEEP_PM

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Message-ID: <CANAwSgS9tbhPK4jwoqR6G1=iKAo15H3Dizu3Lp03KMGbQ4aj9A@mail.gmail.com>
Date:   Sun, 9 Oct 2016 23:57:59 +0530
From:   Anand Moon <linux.amoon@...il.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     Alan Stern <stern@...land.harvard.edu>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kukjin Kim <kgene@...nel.org>,
        Javier Martinez Canillas <javier@....samsung.com>,
        Linux USB Mailing List <linux-usb@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        "linux-samsung-soc@...r.kernel.org" 
        <linux-samsung-soc@...r.kernel.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] host: ehci-exynos: Convert to use the SET_SYSTEM_SLEEP_PM_OPS

hi Krzysztof,

On 9 October 2016 at 22:57, Krzysztof Kozlowski <krzk@...nel.org> wrote:
> On Sun, Oct 09, 2016 at 10:45:40PM +0530, Anand Moon wrote:
>> Hi Krzysztof,
>>
>> On 9 October 2016 at 22:04, Krzysztof Kozlowski <krzk@...nel.org> wrote:
>> > On Sun, Oct 09, 2016 at 02:34:14PM +0000, Anand Moon wrote:
>> >> Move the ehci-exynos system PM callbacks within #ifdef CONFIG_PM_SLEEP
>> >> as to avoid them being build when not used. This also allows us to use the
>> >> SET_SYSTEM_SLEEP_PM_OPS macro which simplifies the code.
>> >>
>> >> Signed-off-by: Anand Moon <linux.amoon@...il.com>
>> >> ---
>> >>  drivers/usb/host/ehci-exynos.c | 14 ++++++--------
>> >>  1 file changed, 6 insertions(+), 8 deletions(-)
>> >>
>> >> diff --git a/drivers/usb/host/ehci-exynos.c b/drivers/usb/host/ehci-exynos.c
>> >> index 42e5b66..1899900 100644
>> >> --- a/drivers/usb/host/ehci-exynos.c
>> >> +++ b/drivers/usb/host/ehci-exynos.c
>> >> @@ -251,7 +251,7 @@ static int exynos_ehci_remove(struct platform_device *pdev)
>> >>       return 0;
>> >>  }
>> >>
>> >> -#ifdef CONFIG_PM
>> >> +#ifdef CONFIG_PM_SLEEP
>> >
>> > Does not look like an equivalent change. How will it behave in a config
>> > with !SUSPEND && !HIBERNATE && PM?
>> >
>>
>> [snip]
>>
>> I just wanted to update suspend and resume callback to use
>> SET_SYSTEM_SLEEP_PM_OPS
>> as they are define under CONFIG_PM_SLEEP so I update above to avoid
>> compilation warning/error.
>
Apologize: for not understanding your question.

> First of all you did not answer to my question, so let me rephrase into
> two:
> 1. Is the code equivalent?

No CONFIG_PM and CONFIG_PM_SLEEP are different options.
But I could not disable CONFIG_PM_SLEEP option with either in exynos_defconfig

CONFIG_PM_SLEEP=n or
# CONFIG_PM_SLEEP is not set

> 2. What will be the output with !SUSPEND && !HIBERNATE && PM?

#
# Power management options
#
# CONFIG_SUSPEND is not set
# CONFIG_HIBERNATION is not set
# CONFIG_PM is not set

When CONFIG_SUSPEND and CONFIG_HIBERNATION are not set
CONFIG_PM is disabled and so is CONFIG_PM_SLEEP.

Best Regards
-Anand Moon

>
> You didn't mention compilation warning/error in message commit so I do
> not know what you are thinking about...
>
> Best regards,
> Krzysztof