linux-kernel - Re: [PATCH v6 5/5] ARM: dts: rockchip: disable arm-global-timer for rk3188

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Message-ID: <2265306.UfJ65TkXez@phil>
Date:   Wed, 01 Feb 2017 10:48:53 +0100
From:   Heiko Stuebner <heiko@...ech.de>
To:     Alexander Kochetkov <al.kochet@...il.com>
Cc:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Caesar Wang <wxt@...k-chips.com>,
        Huang Tao <huangtao@...k-chips.com>
Subject: Re: [PATCH v6 5/5] ARM: dts: rockchip: disable arm-global-timer for rk3188

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@...il.com>

depending on who is picking that up, they can add my
Reviewed-by: Heiko Stuebner <heiko@...ech.de>

if needed.

Later on we might need to look at the rk3066 as well, as it might have the 
same issue.