linux-kernel - Re: [PATCH 1/2] time: Introduce one suspend clocksource to compensate the suspend time

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Message-ID: <9efe5275-e429-76c7-7746-7750c8fd4203@linaro.org>
Date:   Tue, 17 Jul 2018 10:48:29 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Baolin Wang <baolin.wang@...aro.org>, tglx@...utronix.de,
        john.stultz@...aro.org, sboyd@...nel.org, arnd@...db.de,
        broonie@...nel.org
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] time: Introduce one suspend clocksource to compensate
 the suspend time

On 17/07/2018 09:55, Baolin Wang wrote:
> On some hardware with multiple clocksources, we have coarse grained
> clocksources that support the CLOCK_SOURCE_SUSPEND_NONSTOP flag, but
> which are less than ideal for timekeeping whereas other clocksources
> can be better candidates but halt on suspend.
> 
> Currently, the timekeeping core only supports timing suspend using
> CLOCK_SOURCE_SUSPEND_NONSTOP clocksources if that clocksource is the
> current clocksource for timekeeping.
> 
> As a result, some architectures try to implement read_persistent_clock64()
> using those non-stop clocksources, but isn't really ideal, which will
> introduce more duplicate code. To fix this, provide logic to allow a
> registered SUSPEND_NONSTOP clocksource, which isn't the current
> clocksource, to be used to calculate the suspend time.
> 
> Suggested-by: Thomas Gleixner <tglx@...utronix.de>
> Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
> ---

Reviewed-by: Daniel Lezcano <daniel.lezcano@...aro.org>


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