linux-kernel - Re: [PATCH 1/7] ARM: imx: add timer stop flag to ARM power off state

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Message-ID: <1515606522.12538.44.camel@pengutronix.de>
Date:   Wed, 10 Jan 2018 18:48:42 +0100
From:   Lucas Stach <l.stach@...gutronix.de>
To:     Stefan Agner <stefan@...er.ch>, shawnguo@...nel.org,
        kernel@...gutronix.de
Cc:     mark.rutland@....com, devicetree@...r.kernel.org,
        Anson Huang <anson.huang@....com>,
        linux-kernel@...r.kernel.org, robh+dt@...nel.org,
        fabio.estevam@....com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/7] ARM: imx: add timer stop flag to ARM power off state

Am Dienstag, den 02.01.2018, 17:42 +0100 schrieb Stefan Agner:
> 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.
> 
> Cc: Anson Huang <anson.huang@....com>
> Signed-off-by: Stefan Agner <stefan@...er.ch>

Reviewed-by: Lucas Stach <l.stach@...gutronix.de>

> ---
>  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",