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Subject: Re: [PATCH AUTOSEL for 4.9 124/219] ARM: dts: rockchip: disable arm-global-timer for rk3188
From:   Alexander Kochetkov <al.kochet@gmail.com>
In-Reply-To: <20180303222716.26640-124-alexander.levin@microsoft.com>
Date:   Mon, 5 Mar 2018 02:19:42 +0300
Cc:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "stable@vger.kernel.org" <stable@vger.kernel.org>,
        Daniel Lezcano <daniel.lezcano@linaro.org>
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Message-Id: <D6AE445D-6A73-4AFE-8642-6F5ADF14D084@gmail.com>
References: <20180303222716.26640-1-alexander.levin@microsoft.com> <20180303222716.26640-124-alexander.levin@microsoft.com>
To:     Sasha Levin <Alexander.Levin@microsoft.com>
Sender: linux-kernel-owner@vger.kernel.org
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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 =D0=BC=D0=B0=D1=80=D1=82=D0=B0 2018 =D0=B3., =D0=B2 1:29, Sasha =
Levin <Alexander.Levin@microsoft.com> =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=
=D0=BB(=D0=B0):
>=20
> From: Alexander Kochetkov <al.kochet@gmail.com>
>=20
> [ Upstream commit 500d0aa918a2ea6bb918fee8adcf27dc2912bcd1 ]
>=20
> The clocksource and the sched_clock provided by the arm_global_timer
> are quite unstable because their rates depend on the cpu frequency.
>=20
> 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.
>=20
> Let's disable the arm_global_timer in order to have the rockchip
> clocksource selected by default.
>=20
> 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(+)
>=20
> 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 @@
>=20
> &global_timer {
> 	interrupts =3D <GIC_PPI 11 0xf04>;
> +	status =3D "disabled";
> };
>=20
> &local_timer {
> --=20
> 2.14.1