Re: [PATCH AUTOSEL for 4.9 124/219] ARM: dts: rockchip: disable arm-global-timer for rk3188

Alexander Kochetkov
2018-03-04T23:19:48Z

Hello, Sasha!

Following 2 patches must be applied together with the patch:
5e0a39d0f727b35c8b7ef56ba0724c8ceb006297 clocksource/drivers/rockchip_timer: Implement clocksource timer
627988a66aee3c845aa2f1f874a3ddba8adb89d9 ARM: dts: rockchip: Add timer entries to rk3188 SoC

Alexander.

> 4 марта 2018 г., в 1:29, Sasha Levin <Alexander.Levin@microsoft.com> написал(а):
>
> From: Alexander Kochetkov <al.kochet@gmail.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@gmail.com>
> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
> Reviewed-by: Heiko Stuebner <heiko@sntech.de>
> Signed-off-by: Sasha Levin <alexander.levin@microsoft.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 31f81b265cef..73a200914f0b 100644
> --- a/arch/arm/boot/dts/rk3188.dtsi
> +++ b/arch/arm/boot/dts/rk3188.dtsi
> @@ -530,6 +530,7 @@
>
> &global_timer {
> interrupts = <GIC_PPI 11 0xf04>;
> + status = "disabled";
> };
>
> &local_timer {
> --
> 2.14.1