On 2018-01-09 10:22, Dong Aisheng wrote: > 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.hu...@nxp.com> >> Signed-off-by: Stefan Agner <ste...@agner.ch> > > It seems ok at my side. > Did you meet the real issue? If yes, how to reproduce?
Enable the timer added with Patch 5, use a U-Boot with this patchset applied: https://www.mail-archive.com/u-boot@lists.denx.de/msg273287.html And boot... For me it freezed somewhere early during systemd boot phase, presumably the first time the CPU got into this idle mode. -- Stefan > > Both mx6sx and mx6ul are using GPT which do not need that flag, suppose > we should remove it, right? > Anson can help confirm it. > > 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 >>
