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Message-Id: <20190726134432.12993-4-sashal@kernel.org>
Date: Fri, 26 Jul 2019 09:44:06 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Douglas Anderson <dianders@...omium.org>,
Heiko Stuebner <heiko@...ech.de>,
Sasha Levin <sashal@...nel.org>,
linux-rockchip@...ts.infradead.org, devicetree@...r.kernel.org
Subject: [PATCH AUTOSEL 4.9 04/30] ARM: dts: rockchip: Mark that the rk3288 timer might stop in suspend
From: Douglas Anderson <dianders@...omium.org>
[ Upstream commit 8ef1ba39a9fa53d2205e633bc9b21840a275908e ]
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>
Signed-off-by: Heiko Stuebner <heiko@...ech.de>
Signed-off-by: Sasha Levin <sashal@...nel.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 17ec2e2d7a60..30f1384f619b 100644
--- a/arch/arm/boot/dts/rk3288.dtsi
+++ b/arch/arm/boot/dts/rk3288.dtsi
@@ -210,6 +210,7 @@
<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@...10000 {
--
2.20.1
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