From mboxrd@z Thu Jan 1 00:00:00 1970 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752952AbeAJVFC (ORCPT + 1 other); Wed, 10 Jan 2018 16:05:02 -0500 Received: from mail.kmu-office.ch ([178.209.48.109]:47316 "EHLO mail.kmu-office.ch" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752866AbeAJVE6 (ORCPT ); Wed, 10 Jan 2018 16:04:58 -0500 From: Stefan Agner To: shawnguo@kernel.org, kernel@pengutronix.de Cc: fabio.estevam@nxp.com, robh+dt@kernel.org, mark.rutland@arm.com, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Stefan Agner , Anson Huang Subject: [PATCH v2 1/7] ARM: imx: add timer stop flag to ARM power off state Date: Wed, 10 Jan 2018 22:04:47 +0100 Message-Id: <20180110210453.19264-1-stefan@agner.ch> X-Mailer: git-send-email 2.15.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Return-Path: When the CPU is in ARM power off state the ARM architected timers are stopped. The flag is already present in the higher power WAIT mode. This allows to use the ARM generic timer on i.MX 6UL/6ULL SoC. Without the flag the kernel freezes when the timer enters the first time ARM power off mode. Note: The default timer on i.MX6SX is the i.MX GPT timer which is not disabled during CPU idle. However, the timer is not affected by the CPUIDLE_FLAG_TIMER_STOP flag. The flag only affects CPU local timers. Cc: Anson Huang Signed-off-by: Stefan Agner Reviewed-by: Lucas Stach --- arch/arm/mach-imx/cpuidle-imx6sx.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm/mach-imx/cpuidle-imx6sx.c b/arch/arm/mach-imx/cpuidle-imx6sx.c index c5a5c3a70ab1..d0f14b761ff7 100644 --- a/arch/arm/mach-imx/cpuidle-imx6sx.c +++ b/arch/arm/mach-imx/cpuidle-imx6sx.c @@ -89,6 +89,7 @@ static struct cpuidle_driver imx6sx_cpuidle_driver = { */ .exit_latency = 300, .target_residency = 500, + .flags = CPUIDLE_FLAG_TIMER_STOP, .enter = imx6sx_enter_wait, .name = "LOW-POWER-IDLE", .desc = "ARM power off", -- 2.15.1 From mboxrd@z Thu Jan 1 00:00:00 1970 From: stefan@agner.ch (Stefan Agner) Date: Wed, 10 Jan 2018 22:04:47 +0100 Subject: [PATCH v2 1/7] ARM: imx: add timer stop flag to ARM power off state Message-ID: <20180110210453.19264-1-stefan@agner.ch> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org When the CPU is in ARM power off state the ARM architected timers are stopped. The flag is already present in the higher power WAIT mode. This allows to use the ARM generic timer on i.MX 6UL/6ULL SoC. Without the flag the kernel freezes when the timer enters the first time ARM power off mode. Note: The default timer on i.MX6SX is the i.MX GPT timer which is not disabled during CPU idle. However, the timer is not affected by the CPUIDLE_FLAG_TIMER_STOP flag. The flag only affects CPU local timers. Cc: Anson Huang Signed-off-by: Stefan Agner Reviewed-by: Lucas Stach --- arch/arm/mach-imx/cpuidle-imx6sx.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm/mach-imx/cpuidle-imx6sx.c b/arch/arm/mach-imx/cpuidle-imx6sx.c index c5a5c3a70ab1..d0f14b761ff7 100644 --- a/arch/arm/mach-imx/cpuidle-imx6sx.c +++ b/arch/arm/mach-imx/cpuidle-imx6sx.c @@ -89,6 +89,7 @@ static struct cpuidle_driver imx6sx_cpuidle_driver = { */ .exit_latency = 300, .target_residency = 500, + .flags = CPUIDLE_FLAG_TIMER_STOP, .enter = imx6sx_enter_wait, .name = "LOW-POWER-IDLE", .desc = "ARM power off", -- 2.15.1