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drivers/rtc/rtc-twl.c: ensure IRQ is wakeup enabled 

Currently, the RTC IRQ is never wakeup-enabled so is not capable of
bringing the system out of suspend.

On OMAP platforms, we have gotten by without this because the TWL RTC is
on an I2C-connected chip which is capable of waking up the OMAP via the IO
ring when the OMAP is in low-power states.

However, if the OMAP suspends without hitting the low-power states (and
the IO ring is not enabled), RTC wakeups will not work because the IRQ is
not wakeup enabled.

To fix, ensure the RTC IRQ is wakeup enabled whenever the RTC alarm is
set.

Signed-off-by: Kevin Hilman <khilman@linaro.org>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Tony Lindgren <tony@atomide.com>
Cc: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kevin Hilman 2013-07-03 15:07:53 -07:00 committed by Linus Torvalds
parent ee605e0b2e
commit ae8458949a
1 changed files with 14 additions and 2 deletions
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16
drivers/rtc/rtc-twl.c
View File

@ -213,12 +213,24 @@ static int mask_rtc_irq_bit(unsigned char bit)
static int twl_rtc_alarm_irq_enable(struct device *dev, unsigned enabled) static int twl_rtc_alarm_irq_enable(struct device *dev, unsigned enabled)
{ {
struct platform_device *pdev = to_platform_device(dev);
int irq = platform_get_irq(pdev, 0);
static bool twl_rtc_wake_enabled;
int ret; int ret;
if (enabled) if (enabled) {
ret = set_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_ALARM_M); ret = set_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
else if (device_can_wakeup(dev) && !twl_rtc_wake_enabled) {
enable_irq_wake(irq);
twl_rtc_wake_enabled = true;
}
} else {
ret = mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_ALARM_M); ret = mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
if (twl_rtc_wake_enabled) {
disable_irq_wake(irq);
twl_rtc_wake_enabled = false;
}
}
return ret; return ret;
} }