[patch] rtc-sh: act on rtc_wkalrm.enabled when setting an alarm

[Jamie Lenehan <lenehan@twibble.org>]

This fixes the SH rtc driver correctly act on the "enabled" flag when
setting an alarm.

Signed-off-by: Jamie Lenehan <lenehan@twibble.org>

--- a/drivers/rtc/rtc-sh.c
+++ b/drivers/rtc/rtc-sh.c
@@ -492,10 +492,10 @@ static int sh_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
 
 	spin_lock_irq(&rtc->lock);
 
-	/* disable alarm interrupt and clear flag */
+	/* disable alarm interrupt and clear the alarm flag */
 	rcr1 = readb(rtc->regbase + RCR1);
-	rcr1 &= ~RCR1_AF;
-	writeb(rcr1 & ~RCR1_AIE, rtc->regbase + RCR1);
+	rcr1 &= ~(RCR1_AF|RCR1_AIE);
+	writeb(rcr1, rtc->regbase + RCR1);
 
 	rtc->rearm_aie = 0;
 
@@ -510,8 +510,10 @@ static int sh_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
 		mon += 1;
 	sh_rtc_write_alarm_value(rtc, mon, RMONAR);
 
-	/* Restore interrupt activation status */
-	writeb(rcr1, rtc->regbase + RCR1);
+	if (wkalrm->enabled) {
+		rcr1 |= RCR1_AIE;
+		writeb(rcr1, rtc->regbase + RCR1);
+	}
 
 	spin_unlock_irq(&rtc->lock);
 

-- 
 Jamie Lenehan <lenehan@twibble.org>
-
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