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From: Alexander Kochetkov <al.kochet@gmail.com>
To: Daniel Lezcano <daniel.lezcano@linaro.org>,
	Heiko Stuebner <heiko@sntech.de>,
	linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-rockchip@lists.infradead.org
Cc: Thomas Gleixner <tglx@linutronix.de>,
	Mark Rutland <mark.rutland@arm.com>,
	Rob Herring <robh+dt@kernel.org>,
	Russell King <linux@armlinux.org.uk>,
	Caesar Wang <wxt@rock-chips.com>,
	Huang Tao <huangtao@rock-chips.com>,
	Alexander Kochetkov <al.kochet@gmail.com>
Subject: [PATCH v7 7/7] ARM: dts: rockchip: disable arm-global-timer for rk3188
Date: Wed, 22 Mar 2017 18:48:34 +0300	[thread overview]
Message-ID: <1490197714-25415-8-git-send-email-al.kochet@gmail.com> (raw)
In-Reply-To: <1490197714-25415-1-git-send-email-al.kochet@gmail.com>

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@gmail.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
---
 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 a20d501..c316468 100644
--- a/arch/arm/boot/dts/rk3188.dtsi
+++ b/arch/arm/boot/dts/rk3188.dtsi
@@ -548,6 +548,7 @@
 
 &global_timer {
 	interrupts = <GIC_PPI 11 0xf04>;
+	status = "disabled";
 };
 
 &local_timer {
-- 
1.7.9.5

WARNING: multiple messages have this Message-ID (diff)
From: Alexander Kochetkov <al.kochet@gmail.com>
To: Daniel Lezcano <daniel.lezcano@linaro.org>,
	Heiko Stuebner <heiko@sntech.de>,
	linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-rockchip@lists.infradead.org
Cc: Mark Rutland <mark.rutland@arm.com>,
	Huang Tao <huangtao@rock-chips.com>,
	Alexander Kochetkov <al.kochet@gmail.com>,
	Russell King <linux@armlinux.org.uk>,
	Rob Herring <robh+dt@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Caesar Wang <wxt@rock-chips.com>
Subject: [PATCH v7 7/7] ARM: dts: rockchip: disable arm-global-timer for rk3188
Date: Wed, 22 Mar 2017 18:48:34 +0300	[thread overview]
Message-ID: <1490197714-25415-8-git-send-email-al.kochet@gmail.com> (raw)
In-Reply-To: <1490197714-25415-1-git-send-email-al.kochet@gmail.com>

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@gmail.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
---
 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 a20d501..c316468 100644
--- a/arch/arm/boot/dts/rk3188.dtsi
+++ b/arch/arm/boot/dts/rk3188.dtsi
@@ -548,6 +548,7 @@
 
 &global_timer {
 	interrupts = <GIC_PPI 11 0xf04>;
+	status = "disabled";
 };
 
 &local_timer {
-- 
1.7.9.5

WARNING: multiple messages have this Message-ID (diff)
From: al.kochet@gmail.com (Alexander Kochetkov)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v7 7/7] ARM: dts: rockchip: disable arm-global-timer for rk3188
Date: Wed, 22 Mar 2017 18:48:34 +0300	[thread overview]
Message-ID: <1490197714-25415-8-git-send-email-al.kochet@gmail.com> (raw)
In-Reply-To: <1490197714-25415-1-git-send-email-al.kochet@gmail.com>

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@gmail.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
---
 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 a20d501..c316468 100644
--- a/arch/arm/boot/dts/rk3188.dtsi
+++ b/arch/arm/boot/dts/rk3188.dtsi
@@ -548,6 +548,7 @@
 
 &global_timer {
 	interrupts = <GIC_PPI 11 0xf04>;
+	status = "disabled";
 };
 
 &local_timer {
-- 
1.7.9.5

  parent reply	other threads:[~2017-03-22 15:58 UTC|newest]

Thread overview: 56+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-03-22 15:48 [PATCH v7 0/7] Implement clocksource for rockchip SoC using rockchip timer Alexander Kochetkov
2017-03-22 15:48 ` Alexander Kochetkov
2017-03-22 15:48 ` Alexander Kochetkov
2017-03-22 15:48 ` [PATCH v7 1/7] clocksource/drivers/clksrc-evt-probe: Describe with the DT both the clocksource and the clockevent Alexander Kochetkov
2017-03-22 15:48   ` Alexander Kochetkov
2017-03-29  1:51   ` Rob Herring
2017-03-29  1:51     ` Rob Herring
2017-03-29  1:51     ` Rob Herring
2017-03-29  9:22     ` Daniel Lezcano
2017-03-29  9:22       ` Daniel Lezcano
2017-03-29  9:22       ` Daniel Lezcano
2017-03-29 10:49       ` Mark Rutland
2017-03-29 10:49         ` Mark Rutland
2017-03-29 10:49         ` Mark Rutland
2017-03-29 12:36         ` Daniel Lezcano
2017-03-29 12:36           ` Daniel Lezcano
2017-03-29 12:36           ` Daniel Lezcano
2017-03-29 12:57           ` Mark Rutland
2017-03-29 12:57             ` Mark Rutland
2017-03-29 13:41             ` Daniel Lezcano
2017-03-29 13:41               ` Daniel Lezcano
2017-03-29 13:41               ` Daniel Lezcano
2017-03-29 14:34               ` Mark Rutland
2017-03-29 14:34                 ` Mark Rutland
2017-03-29 14:34                 ` Mark Rutland
2017-03-22 15:48 ` [PATCH v7 2/7] dt-bindings: clarify compatible property for rockchip timers Alexander Kochetkov
2017-03-22 15:48   ` Alexander Kochetkov
2017-03-22 15:48   ` Alexander Kochetkov
2017-03-22 15:48 ` [PATCH v7 3/7] ARM: dts: rockchip: update compatible property for rk322x timer Alexander Kochetkov
2017-03-22 15:48   ` Alexander Kochetkov
2017-03-22 15:48   ` Alexander Kochetkov
2017-03-22 15:48 ` [PATCH v7 4/7] ARM: dts: rockchip: add clockevent attribute to rockchip timers Alexander Kochetkov
2017-03-22 15:48   ` Alexander Kochetkov
2017-03-22 15:48 ` [PATCH v7 5/7] clocksource/drivers/rockchip_timer: implement clocksource timer Alexander Kochetkov
2017-03-22 15:48   ` Alexander Kochetkov
2017-03-22 15:48   ` Alexander Kochetkov
2017-03-24  8:29   ` kbuild test robot
2017-03-24  8:29     ` kbuild test robot
2017-03-24  8:29     ` kbuild test robot
2017-03-24  8:41     ` Alexander Kochetkov
2017-03-24  8:41       ` Alexander Kochetkov
2017-03-24  8:41       ` Alexander Kochetkov
2017-03-24  8:55       ` Daniel Lezcano
2017-03-24  8:55         ` Daniel Lezcano
2017-03-24  8:55         ` Daniel Lezcano
2017-03-22 15:48 ` [PATCH v7 6/7] ARM: dts: rockchip: add timer entries to rk3188 SoC Alexander Kochetkov
2017-03-22 15:48   ` Alexander Kochetkov
2017-03-22 15:48   ` Alexander Kochetkov
2017-03-22 15:48 ` Alexander Kochetkov [this message]
2017-03-22 15:48   ` [PATCH v7 7/7] ARM: dts: rockchip: disable arm-global-timer for rk3188 Alexander Kochetkov
2017-03-22 15:48   ` Alexander Kochetkov
2017-03-29 13:22 ` [PATCH v7 0/7] Implement clocksource for rockchip SoC using rockchip timer Alexander Kochetkov
2017-03-29 13:22   ` Alexander Kochetkov
2017-03-30  9:26   ` Daniel Lezcano
2017-03-30  9:26     ` Daniel Lezcano
2017-03-30  9:26     ` Daniel Lezcano

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