1 files changed, 11 insertions, 2 deletions
diff --git a/drivers/rtc/rtc-bfin.c b/drivers/rtc/rtc-bfin.c
index 65facfbe70f..d4fb82d85e9 100644
--- a/drivers/rtc/rtc-bfin.c
+++ b/drivers/rtc/rtc-bfin.c
@@ -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;
 }