linux-kernel - Re: [PATCH] ARM: dts: rockchip: Mark that the rk3288 timer might stop in suspend

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Message-ID: <1654629.mRIXxtDvp3@phil>
Date:   Wed, 22 May 2019 10:04:20 +0200
From:   Heiko Stuebner <heiko@...ech.de>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     briannorris@...omium.org, ryandcase@...omium.org, mka@...omium.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-rockchip@...ts.infradead.org,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] ARM: dts: rockchip: Mark that the rk3288 timer might stop in suspend

Am Mittwoch, 22. Mai 2019, 01:49:33 CEST schrieb Douglas Anderson:
> This is similar to commit e6186820a745 ("arm64: dts: rockchip: Arch
> counter doesn't tick in system suspend").  Specifically on the rk3288
> it can be seen that the timer stops ticking in suspend if we end up
> running through the "osc_disable" path in rk3288_slp_mode_set().  In
> that path the 24 MHz clock will turn off and the timer stops.
> 
> To test this, I ran this on a Chrome OS filesystem:
>   before=$(date); \
>   suspend_stress_test -c1 --suspend_min=30 --suspend_max=31; \
>   echo ${before}; date
> 
> ...and I found that unless I plug in a device that requests USB wakeup
> to be active that the two calls to "date" would show that fewer than
> 30 seconds passed.
> 
> NOTE: deep suspend (where the 24 MHz clock gets disabled) isn't
> supported yet on upstream Linux so this was tested on a downstream
> kernel.
> 
> Signed-off-by: Douglas Anderson <dianders@...omium.org>

applied for 5.3