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From: Douglas Anderson <dianders@chromium.org>
To: Heiko Stuebner <heiko@sntech.de>
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>,
	Douglas Anderson <dianders@chromium.org>,
	linux-rockchip@lists.infradead.org, mka@chromium.org,
	ryandcase@chromium.org, linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: dts: rockchip: Mark that the rk3288 timer might stop in suspend
Date: Tue, 21 May 2019 16:49:33 -0700
Message-ID: <20190521234933.153953-1-dianders@chromium.org> (raw)

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>
---

 arch/arm/boot/dts/rk3288.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/boot/dts/rk3288.dtsi b/arch/arm/boot/dts/rk3288.dtsi
index 171231a0cd9b..1e5260b556b7 100644
--- a/arch/arm/boot/dts/rk3288.dtsi
+++ b/arch/arm/boot/dts/rk3288.dtsi
@@ -231,6 +231,7 @@
 			     <GIC_PPI 11 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_HIGH)>,
 			     <GIC_PPI 10 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_HIGH)>;
 		clock-frequency = <24000000>;
+		arm,no-tick-in-suspend;
 	};
 
 	timer: timer@ff810000 {
-- 
2.21.0.1020.gf2820cf01a-goog


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

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