From: Heiko Stuebner <heiko@sntech.de>
To: Alexander Kochetkov <al.kochet@gmail.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>,
linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-rockchip@lists.infradead.org,
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>
Subject: Re: [PATCH v6 5/5] ARM: dts: rockchip: disable arm-global-timer for rk3188
Date: Wed, 01 Feb 2017 10:48:53 +0100 [thread overview]
Message-ID: <2265306.UfJ65TkXez@phil> (raw)
In-Reply-To: <1485866596-32254-6-git-send-email-al.kochet@gmail.com>
Am Dienstag, 31. Januar 2017, 15:43:16 CET schrieb Alexander Kochetkov:
> 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>
depending on who is picking that up, they can add my
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
if needed.
Later on we might need to look at the rk3066 as well, as it might have the
same issue.
WARNING: multiple messages have this Message-ID (diff)
From: Heiko Stuebner <heiko-4mtYJXux2i+zQB+pC5nmwQ@public.gmane.org>
To: Alexander Kochetkov <al.kochet-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: Daniel Lezcano
<daniel.lezcano-QSEj5FYQhm4dnm+yROfE0A@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,
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>
Subject: Re: [PATCH v6 5/5] ARM: dts: rockchip: disable arm-global-timer for rk3188
Date: Wed, 01 Feb 2017 10:48:53 +0100 [thread overview]
Message-ID: <2265306.UfJ65TkXez@phil> (raw)
In-Reply-To: <1485866596-32254-6-git-send-email-al.kochet-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Am Dienstag, 31. Januar 2017, 15:43:16 CET schrieb Alexander Kochetkov:
> 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>
depending on who is picking that up, they can add my
Reviewed-by: Heiko Stuebner <heiko-4mtYJXux2i+zQB+pC5nmwQ@public.gmane.org>
if needed.
Later on we might need to look at the rk3066 as well, as it might have the
same issue.
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WARNING: multiple messages have this Message-ID (diff)
From: heiko@sntech.de (Heiko Stuebner)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v6 5/5] ARM: dts: rockchip: disable arm-global-timer for rk3188
Date: Wed, 01 Feb 2017 10:48:53 +0100 [thread overview]
Message-ID: <2265306.UfJ65TkXez@phil> (raw)
In-Reply-To: <1485866596-32254-6-git-send-email-al.kochet@gmail.com>
Am Dienstag, 31. Januar 2017, 15:43:16 CET schrieb Alexander Kochetkov:
> 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>
depending on who is picking that up, they can add my
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
if needed.
Later on we might need to look at the rk3066 as well, as it might have the
same issue.
next prev parent reply other threads:[~2017-02-01 9:49 UTC|newest]
Thread overview: 33+ 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 ` Alexander Kochetkov
2017-01-31 12:43 ` Alexander Kochetkov
2017-01-31 12:43 ` [PATCH v6 1/5] dt-bindings: clarify compatible property for rockchip timers Alexander Kochetkov
2017-01-31 12:43 ` Alexander Kochetkov
2017-02-01 9:33 ` Heiko Stuebner
2017-02-01 9:33 ` Heiko Stuebner
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
2017-01-31 12:43 ` Alexander Kochetkov
2017-01-31 12:43 ` Alexander Kochetkov
2017-02-01 9:34 ` Heiko Stuebner
2017-02-01 9:34 ` Heiko Stuebner
2017-02-01 9:34 ` Heiko Stuebner
2017-01-31 12:43 ` [PATCH v6 3/5] clocksource/drivers/rockchip_timer: implement clocksource timer Alexander Kochetkov
2017-01-31 12:43 ` Alexander Kochetkov
2017-01-31 12:43 ` Alexander Kochetkov
2017-01-31 12:43 ` [PATCH v6 4/5] ARM: dts: rockchip: add timer entries to rk3188 SoC Alexander Kochetkov
2017-01-31 12:43 ` Alexander Kochetkov
2017-01-31 12:43 ` Alexander Kochetkov
2017-02-01 9:43 ` Heiko Stuebner
2017-02-01 9:43 ` Heiko Stuebner
2017-01-31 12:43 ` [PATCH v6 5/5] ARM: dts: rockchip: disable arm-global-timer for rk3188 Alexander Kochetkov
2017-01-31 12:43 ` Alexander Kochetkov
2017-01-31 12:43 ` Alexander Kochetkov
2017-02-01 9:48 ` Heiko Stuebner [this message]
2017-02-01 9:48 ` Heiko Stuebner
2017-02-01 9:48 ` Heiko Stuebner
2017-03-20 13:18 ` [PATCH v6 0/5] Implement clocksource for rockchip SoC using rockchip timer Alexander Kochetkov
2017-03-20 13:18 ` Alexander Kochetkov
2017-03-20 13:18 ` Alexander Kochetkov
2017-03-21 8:02 ` Daniel Lezcano
2017-03-21 8:02 ` Daniel Lezcano
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