From: Alexander Kochetkov <al.kochet@gmail.com> To: Daniel Lezcano <daniel.lezcano@linaro.org>, Heiko Stuebner <heiko@sntech.de>, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org Cc: 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>, Alexander Kochetkov <al.kochet@gmail.com> Subject: [PATCH v5 4/8] ARM: dts: rockchip: disable arm-global-timer for rk3188 Date: Tue, 24 Jan 2017 15:16:39 +0300 [thread overview] Message-ID: <1485260203-14216-5-git-send-email-al.kochet@gmail.com> (raw) In-Reply-To: <1485260203-14216-1-git-send-email-al.kochet@gmail.com> clocksource and shed_clock provided by arm-global-timer is quite unstable, because their rate depends on cpu frequency. So disable arm-global-timer and use clocksource and sched_clock from rockchip_timer. It is impossible get stable clocksource having rockchip_timer and arm-global-timer enabled at the same time. Because arm-global-timer looks like a better candidate for the kernel: it has higher frequency and rating. Disabling arm-global-timer doesn't leave kernel without clockevents as there is another clockevent provider (smp-twd). Signed-off-by: Alexander Kochetkov <al.kochet@gmail.com> Reviwed-by: Heiko Stübner <heiko@sntech.de> --- 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 bcf8e03..f677130 100644 --- a/arch/arm/boot/dts/rk3188.dtsi +++ b/arch/arm/boot/dts/rk3188.dtsi @@ -546,6 +546,7 @@ &global_timer { interrupts = <GIC_PPI 11 0xf04>; + status = "disabled"; }; &local_timer { -- 1.7.9.5
WARNING: multiple messages have this Message-ID (diff)
From: al.kochet@gmail.com (Alexander Kochetkov) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v5 4/8] ARM: dts: rockchip: disable arm-global-timer for rk3188 Date: Tue, 24 Jan 2017 15:16:39 +0300 [thread overview] Message-ID: <1485260203-14216-5-git-send-email-al.kochet@gmail.com> (raw) In-Reply-To: <1485260203-14216-1-git-send-email-al.kochet@gmail.com> clocksource and shed_clock provided by arm-global-timer is quite unstable, because their rate depends on cpu frequency. So disable arm-global-timer and use clocksource and sched_clock from rockchip_timer. It is impossible get stable clocksource having rockchip_timer and arm-global-timer enabled at the same time. Because arm-global-timer looks like a better candidate for the kernel: it has higher frequency and rating. Disabling arm-global-timer doesn't leave kernel without clockevents as there is another clockevent provider (smp-twd). Signed-off-by: Alexander Kochetkov <al.kochet@gmail.com> Reviwed-by: Heiko St?bner <heiko@sntech.de> --- 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 bcf8e03..f677130 100644 --- a/arch/arm/boot/dts/rk3188.dtsi +++ b/arch/arm/boot/dts/rk3188.dtsi @@ -546,6 +546,7 @@ &global_timer { interrupts = <GIC_PPI 11 0xf04>; + status = "disabled"; }; &local_timer { -- 1.7.9.5
next prev parent reply other threads:[~2017-01-24 12:18 UTC|newest] Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-01-24 12:16 [PATCH v5 0/8] Implement clocksource for rockchip SoC using rockchip timer Alexander Kochetkov 2017-01-24 12:16 ` Alexander Kochetkov 2017-01-24 12:16 ` Alexander Kochetkov 2017-01-24 12:16 ` [PATCH v5 1/8] dt-bindings: clarify compatible property for rockchip timers Alexander Kochetkov 2017-01-24 12:16 ` Alexander Kochetkov 2017-01-24 12:16 ` Alexander Kochetkov 2017-01-24 12:16 ` [PATCH v5 2/8] ARM: dts: rockchip: update compatible property for rk322x timer Alexander Kochetkov 2017-01-24 12:16 ` Alexander Kochetkov 2017-01-24 12:16 ` [PATCH v5 3/8] ARM: dts: rockchip: add timer entries to rk3188 SoC Alexander Kochetkov 2017-01-24 12:16 ` Alexander Kochetkov 2017-01-30 11:04 ` Daniel Lezcano 2017-01-30 11:04 ` Daniel Lezcano 2017-01-30 11:04 ` Daniel Lezcano 2017-01-30 11:20 ` Alexander Kochetkov 2017-01-30 11:20 ` Alexander Kochetkov 2017-01-30 12:04 ` Daniel Lezcano 2017-01-30 12:04 ` Daniel Lezcano 2017-01-30 13:13 ` Alexander Kochetkov 2017-01-30 13:13 ` Alexander Kochetkov 2017-01-30 13:13 ` Alexander Kochetkov 2017-01-30 13:35 ` Daniel Lezcano 2017-01-30 13:35 ` Daniel Lezcano 2017-01-30 13:35 ` Daniel Lezcano 2017-01-24 12:16 ` Alexander Kochetkov [this message] 2017-01-24 12:16 ` [PATCH v5 4/8] ARM: dts: rockchip: disable arm-global-timer for rk3188 Alexander Kochetkov 2017-01-30 10:21 ` Daniel Lezcano 2017-01-30 10:21 ` Daniel Lezcano 2017-01-24 12:16 ` [PATCH v5 5/8] clocksource/drivers/rockchip_timer: split bc_timer into rk_timer and rk_clock_event_device Alexander Kochetkov 2017-01-24 12:16 ` Alexander Kochetkov 2017-01-24 12:16 ` Alexander Kochetkov 2017-01-24 15:02 ` Heiko Stübner 2017-01-24 15:02 ` Heiko Stübner 2017-01-24 15:02 ` Heiko Stübner 2017-01-24 15:16 ` Alexander Kochetkov 2017-01-24 15:16 ` Alexander Kochetkov 2017-01-24 15:16 ` Alexander Kochetkov 2017-01-29 20:30 ` Heiko Stuebner 2017-01-29 20:30 ` Heiko Stuebner 2017-01-29 20:30 ` Heiko Stuebner 2017-01-30 13:12 ` Daniel Lezcano 2017-01-30 13:12 ` Daniel Lezcano 2017-01-30 13:12 ` Daniel Lezcano 2017-01-30 13:55 ` Alexander Kochetkov 2017-01-30 13:55 ` Alexander Kochetkov 2017-01-30 13:55 ` Alexander Kochetkov 2017-01-30 14:20 ` Daniel Lezcano 2017-01-30 14:20 ` Daniel Lezcano 2017-01-30 14:20 ` Daniel Lezcano 2017-01-24 12:16 ` [PATCH v5 6/8] clocksource/drivers/rockchip_timer: low level routines take rk_timer as parameter Alexander Kochetkov 2017-01-24 12:16 ` Alexander Kochetkov 2017-01-24 12:16 ` [PATCH v5 7/8] clocksource/drivers/rockchip_timer: move TIMER_INT_UNMASK out of rk_timer_enable() Alexander Kochetkov 2017-01-24 12:16 ` Alexander Kochetkov 2017-01-24 12:16 ` [PATCH v5 8/8] clocksource/drivers/rockchip_timer: implement clocksource timer Alexander Kochetkov 2017-01-24 12:16 ` Alexander Kochetkov 2017-01-24 12:16 ` Alexander Kochetkov 2017-01-30 13:54 ` Daniel Lezcano 2017-01-30 13:54 ` Daniel Lezcano 2017-01-30 13:54 ` Daniel Lezcano
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