drivers/rtc/rtc-s3c.c: fix no occurrence of alarm interrupt

The driver does not generate an alarm interrupt even though a time for
an alarm is set.

This results from disabling rtc_clk after setting the alarm time.

To generate an alarm interrupt the driver should maintain its enabled
state for rtc_clk the until alarm interrupt occurs.  This patch permits
generation of an alarm interrupt.

[akpm@linux-foundation.org: make s3c_rtc_alarm_clk_lock local to s3c_rtc_alarm_clk_enable()]
Signed-off-by: Donggeun Kim <dg77.kim@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 26 insertions, 0 deletions

diff --git a/drivers/rtc/rtc-s3c.c b/drivers/rtc/rtc-s3c.c
index 4e7c04e773e..7639ab906f0 100644
--- a/drivers/rtc/rtc-s3c.c
+++ b/drivers/rtc/rtc-s3c.c
@@ -51,6 +51,27 @@ static enum s3c_cpu_type s3c_rtc_cpu_type;
 
 static DEFINE_SPINLOCK(s3c_rtc_pie_lock);
 
+static void s3c_rtc_alarm_clk_enable(bool enable)
+{
+        static DEFINE_SPINLOCK(s3c_rtc_alarm_clk_lock);
+        static bool alarm_clk_enabled;
+        unsigned long irq_flags;
+
+        spin_lock_irqsave(&s3c_rtc_alarm_clk_lock, irq_flags);
+        if (enable) {
+                if (!alarm_clk_enabled) {
+                        clk_enable(rtc_clk);
+                        alarm_clk_enabled = true;
+                }
+        } else {
+                if (alarm_clk_enabled) {
+                        clk_disable(rtc_clk);
+                        alarm_clk_enabled = false;
+                }
+        }
+        spin_unlock_irqrestore(&s3c_rtc_alarm_clk_lock, irq_flags);
+}
+
 /* IRQ Handlers */
 
 static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
@@ -64,6 +85,9 @@ static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
                 writeb(S3C2410_INTP_ALM, s3c_rtc_base + S3C2410_INTP);
 
         clk_disable(rtc_clk);
+
+        s3c_rtc_alarm_clk_enable(false);
+
         return IRQ_HANDLED;
 }
 
@@ -97,6 +121,8 @@ static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
         writeb(tmp, s3c_rtc_base + S3C2410_RTCALM);
         clk_disable(rtc_clk);
 
+        s3c_rtc_alarm_clk_enable(enabled);
+
         return 0;
 }