From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751210AbdAXMSG (ORCPT ); Tue, 24 Jan 2017 07:18:06 -0500 Received: from mail-lf0-f68.google.com ([209.85.215.68]:34705 "EHLO mail-lf0-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750922AbdAXMQ4 (ORCPT ); Tue, 24 Jan 2017 07:16:56 -0500 From: Alexander Kochetkov To: Daniel Lezcano , Heiko Stuebner , linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org Cc: Thomas Gleixner , Mark Rutland , Rob Herring , Russell King , Caesar Wang , Huang Tao , Alexander Kochetkov Subject: [PATCH v5 4/8] ARM: dts: rockchip: disable arm-global-timer for rk3188 Date: Tue, 24 Jan 2017 15:16:39 +0300 Message-Id: <1485260203-14216-5-git-send-email-al.kochet@gmail.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1485260203-14216-1-git-send-email-al.kochet@gmail.com> References: <1485260203-14216-1-git-send-email-al.kochet@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 Reviwed-by: Heiko Stübner --- 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 = ; + status = "disabled"; }; &local_timer { -- 1.7.9.5 From mboxrd@z Thu Jan 1 00:00:00 1970 From: al.kochet@gmail.com (Alexander Kochetkov) Date: Tue, 24 Jan 2017 15:16:39 +0300 Subject: [PATCH v5 4/8] ARM: dts: rockchip: disable arm-global-timer for rk3188 In-Reply-To: <1485260203-14216-1-git-send-email-al.kochet@gmail.com> References: <1485260203-14216-1-git-send-email-al.kochet@gmail.com> Message-ID: <1485260203-14216-5-git-send-email-al.kochet@gmail.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 Reviwed-by: Heiko St?bner --- 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 = ; + status = "disabled"; }; &local_timer { -- 1.7.9.5