1 files changed, 12 insertions, 3 deletions

diff --git a/drivers/rtc/rtc-bfin.c b/drivers/rtc/rtc-bfin.c
index 72b2bcc2c224..d4fb82d85e9b 100644
--- a/drivers/rtc/rtc-bfin.c
+++ b/drivers/rtc/rtc-bfin.c
@@ -426,7 +426,7 @@ static int bfin_rtc_suspend(struct platform_device *pdev, pm_message_t state)
                 enable_irq_wake(IRQ_RTC);
                 bfin_rtc_sync_pending(&pdev->dev);
         } else
-                bfin_rtc_int_clear(-1);
+                bfin_rtc_int_clear(0);
 
         return 0;
 }
@@ -435,8 +435,17 @@ static int bfin_rtc_resume(struct platform_device *pdev)
 {
         if (device_may_wakeup(&pdev->dev))
                 disable_irq_wake(IRQ_RTC);
-        else
-                bfin_write_RTC_ISTAT(-1);
+
+        /*
+         * Since only some of the RTC bits are maintained externally in the
+         * Vbat domain, we need to wait for the RTC MMRs to be synced into
+         * the core after waking up.  This happens every RTC 1HZ.  Once that
+         * has happened, we can go ahead and re-enable the important write
+         * complete interrupt event.
+         */
+        while (!(bfin_read_RTC_ISTAT() & RTC_ISTAT_SEC))
+                continue;
+        bfin_rtc_int_set(RTC_ISTAT_WRITE_COMPLETE);
 
         return 0;
 }