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authorKevin Hilman <khilman@linaro.org>2013-07-04 02:07:53 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2013-07-04 03:07:59 +0400
commitae8458949a57346e17a07768fbdb626cbe993b89 (patch)
tree5ff97ce8b5167c62a28c5d0aa012a8624b51bb5b /drivers/rtc/rtc-twl.c
parentee605e0b2e12040dc1fe88eb8ab03bde0b8f92b8 (diff)
downloadlinux-ae8458949a57346e17a07768fbdb626cbe993b89.tar.xz
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>
Diffstat (limited to 'drivers/rtc/rtc-twl.c')
-rw-r--r--drivers/rtc/rtc-twl.c16
1 files changed, 14 insertions, 2 deletions
diff --git a/drivers/rtc/rtc-twl.c b/drivers/rtc/rtc-twl.c
index 52843d0132be..3614874f7e3f 100644
--- a/drivers/rtc/rtc-twl.c
+++ b/drivers/rtc/rtc-twl.c
@@ -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)
{
+ struct platform_device *pdev = to_platform_device(dev);
+ int irq = platform_get_irq(pdev, 0);
+ static bool twl_rtc_wake_enabled;
int ret;
- if (enabled)
+ if (enabled) {
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);
+ if (twl_rtc_wake_enabled) {
+ disable_irq_wake(irq);
+ twl_rtc_wake_enabled = false;
+ }
+ }
return ret;
}