From: Johan Jonker <jbx6244@gmail.com>
To: heiko@sntech.de
Cc: linux@armlinux.org.uk, robh+dt@kernel.org,
krzysztof.kozlowski+dt@linaro.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-rockchip@lists.infradead.org
Subject: [PATCH v1 2/2] ARM: dts: rockchip: rk3066a: disable arm_global_timer
Date: Sun, 30 Oct 2022 19:37:01 +0100 [thread overview]
Message-ID: <903ba85a-75fc-ff9e-e0ba-4a1e6161abc1@gmail.com> (raw)
In-Reply-To: <88e93a81-ef9f-adcc-db83-f8b5ba615c47@gmail.com>
The clocksource and the sched_clock provided by the arm_global_timer
on Rockchip rk3066a/rk3188 are quite unstable because their rates
depend on the cpu frequency.
Recent changes to the arm_global_timer driver makes it impossible to use.
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 DW_APB_TIMER
(rk3066a) selected by default.
Signed-off-by: Johan Jonker <jbx6244@gmail.com>
---
ARM: dts: rockchip: disable arm-global-timer for rk3188
https://lore.kernel.org/linux-rockchip/1492374441-23336-26-git-send-email-daniel.lezcano@linaro.org/
clocksource: arm_global_timer: implement rate compensation whenever source clock changes
https://lore.kernel.org/all/20210406130045.15491-2-andrea.merello@gmail.com/
---
arch/arm/boot/dts/rk3066a.dtsi | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/arm/boot/dts/rk3066a.dtsi b/arch/arm/boot/dts/rk3066a.dtsi
index de9915d94..cf8045625 100644
--- a/arch/arm/boot/dts/rk3066a.dtsi
+++ b/arch/arm/boot/dts/rk3066a.dtsi
@@ -653,6 +653,10 @@
};
};
+&global_timer {
+ status = "disabled";
+};
+
&gpu {
compatible = "rockchip,rk3066-mali", "arm,mali-400";
interrupts = <GIC_SPI 5 IRQ_TYPE_LEVEL_HIGH>,
--
2.20.1
next prev parent reply other threads:[~2022-10-30 18:37 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-30 18:36 [PATCH v1 1/2] arm: rockchip: Kconfig: remove select ARM_GLOBAL_TIMER Johan Jonker
2022-10-30 18:37 ` Johan Jonker [this message]
2022-10-30 19:30 ` Heiko Stuebner
2022-10-30 19:45 ` Johan Jonker
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