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From: Alexander Kochetkov <al.kochet-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: Daniel Lezcano
	<daniel.lezcano-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
	Heiko Stuebner <heiko-4mtYJXux2i+zQB+pC5nmwQ@public.gmane.org>,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
	linux-rockchip-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
Cc: Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>,
	Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>,
	Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	Russell King <linux-I+IVW8TIWO2tmTQ+vhA3Yw@public.gmane.org>,
	Caesar Wang <wxt-TNX95d0MmH7DzftRWevZcw@public.gmane.org>,
	Huang Tao <huangtao-TNX95d0MmH7DzftRWevZcw@public.gmane.org>,
	Alexander Kochetkov
	<al.kochet-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: [PATCH v6 5/5] ARM: dts: rockchip: disable arm-global-timer for rk3188
Date: Tue, 31 Jan 2017 15:43:16 +0300	[thread overview]
Message-ID: <1485866596-32254-6-git-send-email-al.kochet@gmail.com> (raw)
In-Reply-To: <1485866596-32254-1-git-send-email-al.kochet-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>

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-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 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 0dc52fe..44da3d42 100644
--- a/arch/arm/boot/dts/rk3188.dtsi
+++ b/arch/arm/boot/dts/rk3188.dtsi
@@ -546,6 +546,7 @@
 
 &global_timer {
 	interrupts = <GIC_PPI 11 0xf04>;
+	status = "disabled";
 };
 
 &local_timer {
-- 
1.7.9.5

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  parent reply	other threads:[~2017-01-31 12:43 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-01-31 12:43 [PATCH v6 0/5] Implement clocksource for rockchip SoC using rockchip timer Alexander Kochetkov
2017-01-31 12:43 ` [PATCH v6 1/5] dt-bindings: clarify compatible property for rockchip timers Alexander Kochetkov
     [not found]   ` <1485866596-32254-2-git-send-email-al.kochet-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2017-02-01  9:33     ` Heiko Stuebner
2017-01-31 12:43 ` [PATCH v6 2/5] ARM: dts: rockchip: update compatible property for rk322x timer Alexander Kochetkov
     [not found]   ` <1485866596-32254-3-git-send-email-al.kochet-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2017-02-01  9:34     ` Heiko Stuebner
     [not found] ` <1485866596-32254-1-git-send-email-al.kochet-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2017-01-31 12:43   ` [PATCH v6 3/5] clocksource/drivers/rockchip_timer: implement clocksource timer Alexander Kochetkov
2017-01-31 12:43   ` [PATCH v6 4/5] ARM: dts: rockchip: add timer entries to rk3188 SoC Alexander Kochetkov
2017-02-01  9:43     ` Heiko Stuebner
2017-01-31 12:43   ` Alexander Kochetkov [this message]
     [not found]     ` <1485866596-32254-6-git-send-email-al.kochet-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2017-02-01  9:48       ` [PATCH v6 5/5] ARM: dts: rockchip: disable arm-global-timer for rk3188 Heiko Stuebner
2017-03-20 13:18 ` [PATCH v6 0/5] Implement clocksource for rockchip SoC using rockchip timer Alexander Kochetkov
2017-03-21  8:02   ` Daniel Lezcano

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