linux-kernel - [PATCH AUTOSEL for 3.18 34/63] ARM: dts: rockchip: disable arm-global-timer for rk3188

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Date:   Sat, 3 Mar 2018 22:33:30 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Alexander Kochetkov <al.kochet@...il.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 3.18 34/63] ARM: dts: rockchip: disable
 arm-global-timer for rk3188

From: Alexander Kochetkov <al.kochet@...il.com>

[ Upstream commit 500d0aa918a2ea6bb918fee8adcf27dc2912bcd1 ]

The clocksource and the sched_clock provided by the arm_global_timer
are quite unstable because their rates depend on the cpu frequency.

On the other side, the arm_global_timer has a higher rating than the
rockchip_timer, it will be selected by default by the time framework
while we want to use the stable rockchip clocksource.

Let's disable the arm_global_timer in order to have the rockchip
clocksource selected by default.

Signed-off-by: Alexander Kochetkov <al.kochet@...il.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
Reviewed-by: Heiko Stuebner <heiko@...ech.de>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 arch/arm/boot/dts/rk3188.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/boot/dts/rk3188.dtsi b/arch/arm/boot/dts/rk3188.dtsi
index ddaada788b45..72b0b4cb538f 100644
--- a/arch/arm/boot/dts/rk3188.dtsi
+++ b/arch/arm/boot/dts/rk3188.dtsi
@@ -404,6 +404,7 @@
 
 &global_timer {
 	interrupts = <GIC_PPI 11 0xf04>;
+	status = "disabled";
 };
 
 &local_timer {
-- 
2.14.1