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powerpc/time: Add set_state_oneshot_stopped decrementer callback 

If CONFIG_PPC_WATCHDOG is enabled we always cap the decrementer to
0x7fffffff:

       if (IS_ENABLED(CONFIG_PPC_WATCHDOG))
                set_dec(0x7fffffff);
        else
                set_dec(decrementer_max);

If there are no future events, we don't reprogram the decrementer
after this and we end up with 0x7fffffff even on a large decrementer
capable system.

As suggested by Nick, add a set_state_oneshot_stopped callback
so we program the decrementer with decrementer_max if there are
no future events.

Signed-off-by: Anton Blanchard <anton@ozlabs.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Anton Blanchard 2018-10-02 09:01:05 +10:00 committed by Michael Ellerman
parent 8b78fdb045
commit 817593604e
1 changed files with 1 additions and 0 deletions
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arch/powerpc/kernel/time.c
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@ -111,6 +111,7 @@ struct clock_event_device decrementer_clockevent = {
.rating = 200,
.irq = 0,
.set_next_event = decrementer_set_next_event,
.set_state_oneshot_stopped = decrementer_shutdown,
.set_state_shutdown = decrementer_shutdown,
.tick_resume = decrementer_shutdown,
.features = CLOCK_EVT_FEAT_ONESHOT |