linux-kernel - Re: [PATCH v2 1/2] clocksource: arm_arch_timer: Don't assume clock runs in suspend

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Message-ID: <20161013112140.6f71fec7@arm.com>
Date:   Thu, 13 Oct 2016 11:21:40 +0100
From:   Marc Zyngier <marc.zyngier@....com>
To:     Brian Norris <briannorris@...omium.org>
Cc:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Heiko Stuebner <heiko@...ech.de>,
        Mark Rutland <mark.rutland@....com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        <linux-rockchip@...ts.infradead.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Douglas Anderson <dianders@...omium.org>,
        Caesar Wang <wxt@...k-chips.com>,
        Rob Herring <robh+dt@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>
Subject: Re: [PATCH v2 1/2] clocksource: arm_arch_timer: Don't assume clock
 runs in suspend

On Tue,  4 Oct 2016 11:12:09 -0700
Brian Norris <briannorris@...omium.org> wrote:

> The ARM ARM specifies that the system counter "must be implemented in an
> always-on power domain," and so we try to use the counter as a source of
> timekeeping across suspend/resume. Unfortunately, some SoCs (e.g.,
> Rockchip's RK3399) do not keep the counter ticking properly when
> switched from their high-power clock to the lower-power clock used in
> system suspend. Support this quirk by adding a new device tree property.
> 
> Signed-off-by: Brian Norris <briannorris@...omium.org>

Acked-by: Marc Zyngier <marc.zyngier@....com>

	M.
-- 
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