linux-kernel - Re: [PATCH] arm64: dts: allwinner: Mark timer as stopped in suspend

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Message-ID: <20200818091038.uie3gxn7i74loho6@gilmour.lan>
Date:   Tue, 18 Aug 2020 11:10:38 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Samuel Holland <samuel@...lland.org>
Cc:     Chen-Yu Tsai <wens@...e.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: allwinner: Mark timer as stopped in suspend

Hi!

On Sat, Aug 08, 2020 at 09:18:22PM -0500, Samuel Holland wrote:
> When possible, system firmware on 64-bit Allwinner platforms disables
> OSC24M during system suspend. Since this oscillator is the clock source
> for the ARM architectural timer, this causes the timer to stop counting.
> Therefore, the ARM architectural timer must not be marked as NONSTOP on
> these platforms, or the time will be wrong after system resume.
> 
> Adding the arm,no-tick-in-suspend property forces the kernel to ignore
> the ARM architectural timer when calculating sleeptime; it falls back to
> reading the RTC. Note that this only affects deep suspend, not s2idle.
> 
> Signed-off-by: Samuel Holland <samuel@...lland.org>

Applied, thanks!

I assume it affects all the SoCs with a Cortex-A7 as well?

Maxime

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