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From: Heiko Stuebner <heiko@sntech.de>
To: Douglas Anderson <dianders@chromium.org>
Cc: Mark Rutland <mark.rutland@arm.com>,
	devicetree@vger.kernel.org, briannorris@chromium.org,
	linux-kernel@vger.kernel.org, Rob Herring <robh+dt@kernel.org>,
	linux-rockchip@lists.infradead.org, mka@chromium.org,
	ryandcase@chromium.org, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] ARM: dts: rockchip: Mark that the rk3288 timer might stop in suspend
Date: Wed, 22 May 2019 10:04:20 +0200
Message-ID: <1654629.mRIXxtDvp3@phil> (raw)
In-Reply-To: <20190521234933.153953-1-dianders@chromium.org>

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@chromium.org>

applied for 5.3



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Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-21 23:49 Douglas Anderson
2019-05-22  8:04 ` Heiko Stuebner [this message]

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