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rtc: Provide flag for rtc devices that don't support UIE

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Richard Weinberger noticed that on some RTC hardware that
doesn't support UIE mode, due to coarse granular alarms
(like 1minute resolution), the current virtualized RTC
support doesn't properly error out when UIE is enabled.

Instead the current code queues an alarm for the next second,
but it won't fire until up to a miniute later.

This patch provides a generic way to flag this sort of hardware
and fixes the issue on the mpc5121 where Richard noticed the
problem.

CC: stable@vger.kernel.org
Reported-by: Richard Weinberger <richard@nod.at>
Tested-by: Richard Weinberger <richard@nod.at>
Signed-off-by: John Stultz <john.stultz@linaro.org>
This commit is contained in:
John Stultz
2012-03-06 17:16:09 -08:00
parent 74a622be3d
commit 4a649903f9
3 changed files with 9 additions and 1 deletions
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5
drivers/rtc/interface.c
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@@ -458,6 +458,11 @@ int rtc_update_irq_enable(struct rtc_device *rtc, unsigned int enabled)
if (rtc->uie_rtctimer.enabled == enabled)
goto out;
if (rtc->uie_unsupported) {
err = -EINVAL;
goto out;
}
if (enabled) {
struct rtc_time tm;
ktime_t now, onesec;