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Date: Sun, 29 Nov 2015 16:29:29 -0800 From: "santosh.shilimkar@...cle.com" <santosh.shilimkar@...cle.com> To: Grygorii Strashko <grygorii.strashko@...com>, Russell King <linux@....linux.org.uk>, Daniel Lezcano <daniel.lezcano@...aro.org>, Thomas Gleixner <tglx@...utronix.de>, Srinivas Kandagatla <srinivas.kandagatla@...il.com>, Maxime Coquelin <maxime.coquelin@...com> Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, kernel@...inux.com, linux-omap@...r.kernel.org, Arnd Bergmann <arnd@...db.de>, John Stultz <john.stultz@...aro.org>, Felipe Balbi <balbi@...com>, Tony Lindgren <tony@...mide.com>, Santosh Shilimkar <ssantosh@...nel.org>, Marc Zyngier <marc.zyngier@....com> Subject: Re: [PATCH v3] clocksource: arm_global_timer: fix suspend resume On 11/27/15 11:47 AM, Grygorii Strashko wrote: > Now the System stall is observed on TI AM437x based board > (am437x-gp-evm) during resuming from System suspend when ARM Global > timer is selected as clocksource device (CPUIdle not enabled) - SysRq are working, > but nothing else. > > The reason of stall is that ARM Global timer loses its contexts during > System suspend: > GT_CONTROL.TIMER_ENABLE = 0 (unbanked) > GT_COUNTERx = 0 > > Hence, update ARM Global timer driver to reflect above behaviour > - re-enable ARM Global timer on resume GT_CONTROL.TIMER_ENABLE = 1. > > CC: Arnd Bergmann <arnd@...db.de> > Cc: John Stultz <john.stultz@...aro.org> > Cc: Felipe Balbi <balbi@...com> > Cc: Tony Lindgren <tony@...mide.com> > Cc: Santosh Shilimkar <ssantosh@...nel.org> > Cc: Marc Zyngier <marc.zyngier@....com> > Signed-off-by: Grygorii Strashko <grygorii.strashko@...com> > --- > Changes in v3: > - dropped all DT specific code > Changes in v2: > - suspend/resume simplified: nothing is stored any more and > ARM GT just re-enabled > Link on v2: > https://lkml.org/lkml/2015/11/20/355 > Link on v1: > https://lkml.org/lkml/2015/11/13/456 > Looks reasonable to me. > drivers/clocksource/arm_global_timer.c | 7 +++++++ > 1 file changed, 7 insertions(+) > > diff --git a/drivers/clocksource/arm_global_timer.c b/drivers/clocksource/arm_global_timer.c > index a2cb6fa..10d1417 100644 > --- a/drivers/clocksource/arm_global_timer.c > +++ b/drivers/clocksource/arm_global_timer.c > @@ -195,12 +195,19 @@ static cycle_t gt_clocksource_read(struct clocksource *cs) > return gt_counter_read(); > } > > +static void gt_resume(struct clocksource *cs) > +{ > + /* re-enable timer on resume */ > + writel(GT_CONTROL_TIMER_ENABLE, gt_base + GT_CONTROL); Check if its disabled before enabling it. Other than that, Reviewed-by: Santosh Shilimkar <ssantosh@...nel.org> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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