On Monday 31 December 2012 06:37 PM, Vaibhav Bedia wrote:
The current OMAP timer code registers two timers - one as clocksource and one as clockevent. AM33XX has only one usable timer in the WKUP domain so one of the timers needs suspend-resume support to restore the configuration to pre-suspend state.commit adc78e6 (timekeeping: Add suspend and resume of clock event devices) introduced .suspend and .resume callbacks for clock event devices. Leverages these callbacks to have AM33XX clockevent timer which is in not in WKUP domain to behave properly across system suspend. Signed-off-by: Vaibhav Bedia <vaibhav.be...@ti.com> Cc: Santosh Shilimkar <santosh.shilim...@ti.com> Cc: Benoit Cousson <b-cous...@ti.com> Cc: Paul Walmsley <p...@pwsan.com> Cc: Kevin Hilman <khil...@deeprootsystems.com> Cc: Vaibhav Hiremath <hvaib...@ti.com> Cc: Jon Hunter <jon-hun...@ti.com> --- v1->v2: Get rid of harcoded timer id. Note: since a platform device is not created for these timer instances and because there's very minimal change needed for restarting the timer a full blown context save and restore has been skipped. arch/arm/mach-omap2/timer.c | 33 +++++++++++++++++++++++++++++++++ 1 files changed, 33 insertions(+), 0 deletions(-) diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c index 691aa67..38f9cbc 100644 --- a/arch/arm/mach-omap2/timer.c +++ b/arch/arm/mach-omap2/timer.c @@ -128,6 +128,36 @@ static void omap2_gp_timer_set_mode(enum clock_event_mode mode, } } +static void omap_clkevt_suspend(struct clock_event_device *unused) +{ + char name[10]; + struct omap_hwmod *oh; + + sprintf(name, "timer%d", clkev.id); + oh = omap_hwmod_lookup(name); + if (!oh) + return; + + __omap_dm_timer_stop(&clkev, 1, clkev.rate); + omap_hwmod_idle(oh); +} + +static void omap_clkevt_resume(struct clock_event_device *unused) +{ + char name[10]; + struct omap_hwmod *oh; + + sprintf(name, "timer%d", clkev.id); + oh = omap_hwmod_lookup(name); + if (!oh) + return; + + omap_hwmod_enable(oh); + __omap_dm_timer_load_start(&clkev, + OMAP_TIMER_CTRL_ST | OMAP_TIMER_CTRL_AR, 0, 1); + __omap_dm_timer_int_enable(&clkev, OMAP_TIMER_INT_OVERFLOW); +} +
Am still bit uncomfortable with direct hwmod usage in the suspend/resmue hooks. Jon, Any alternatives you can think of ? Regards, Santosh -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
