Best Regards! Anson Huang > -----Original Message----- > From: Dong Aisheng [mailto:dongas86@xxxxxxxxx] > Sent: 2018-01-09 5:23 PM > To: Stefan Agner <stefan@xxxxxxxx> > Cc: shawnguo@xxxxxxxxxx; kernel@xxxxxxxxxxxxxx; Fabio Estevam > <fabio.estevam@xxxxxxx>; robh+dt@xxxxxxxxxx; mark.rutland@xxxxxxx; > linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx; linux- > kernel@xxxxxxxxxxxxxxx; Anson Huang <anson.huang@xxxxxxx>; dl-linux-imx > <linux-imx@xxxxxxx> > Subject: Re: [PATCH 1/7] ARM: imx: add timer stop flag to ARM power off state > > On Tue, Jan 02, 2018 at 05:42:17PM +0100, Stefan Agner wrote: > > 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@xxxxxxx> > > Signed-off-by: Stefan Agner <stefan@xxxxxxxx> > > It seems ok at my side. > Did you meet the real issue? If yes, how to reproduce? > > Both mx6sx and mx6ul are using GPT which do not need that flag, suppose we > should remove it, right? > Anson can help confirm it. For UP system like i.MX6SX, we do NOT enable "cortex-a9-twd-timer", so local timer is NOT used, GPT is used instead, GPT's clock is NOT disabled when cpuidle, so I think we should remove all these Timer stop flag for 6SX CPUIDLE. Anson. > > Regards > Dong Aisheng > > > --- > > 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 > > -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
