On Tue, Aug 6, 2013 at 10:49 AM, Dave Gerlach <d-gerlach@xxxxxx> wrote:
> From: Vaibhav Bedia <vaibhav.bedia@xxxxxx>
>
> OMAP timer code registers two timers - one as clocksource
> and one as clockevent. Since AM33XX has only one usable timer
> in the WKUP domain 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.bedia@xxxxxx>
> Signed-off-by: Dave Gerlach <d-gerlach@xxxxxx>
Reviewed-by: Russ Dill <russ.dill@xxxxxx>
> ---
> arch/arm/mach-omap2/timer.c | 32 ++++++++++++++++++++++++++++++++
> 1 file changed, 32 insertions(+)
>
> diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c
> index b37e1fc..cce5d39 100644
> --- a/arch/arm/mach-omap2/timer.c
> +++ b/arch/arm/mach-omap2/timer.c
> @@ -118,11 +118,43 @@ 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);
> +}
> +
> static struct clock_event_device clockevent_gpt = {
> .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
> .rating = 300,
> .set_next_event = omap2_gp_timer_set_next_event,
> .set_mode = omap2_gp_timer_set_mode,
> + .suspend = omap_clkevt_suspend,
> + .resume = omap_clkevt_resume,
> };
>
> static struct property device_disabled = {
> --
> 1.7.9.5
>
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