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authorDonggeun Kim <dg77.kim@samsung.com>2011-09-15 03:22:19 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2011-09-15 05:09:38 +0400
commit88cee8fd77af28d414b983798dd30c8950c71e31 (patch)
treedd22f35e13c9305d5ecda7297f69eb8b68ffaf61 /drivers/rtc
parent7a5caabd090b8f7d782c40fc1c048d798f2b6fd7 (diff)
downloadlinux-88cee8fd77af28d414b983798dd30c8950c71e31.tar.xz
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>
Diffstat (limited to 'drivers/rtc')
-rw-r--r--drivers/rtc/rtc-s3c.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-s3c.c b/drivers/rtc/rtc-s3c.c
index 4e7c04e773e0..7639ab906f02 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;
}