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-rw-r--r--src/drivers/pc80/mc146818rtc.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/src/drivers/pc80/mc146818rtc.c b/src/drivers/pc80/mc146818rtc.c
index 52cfb63275..6e5b92a35c 100644
--- a/src/drivers/pc80/mc146818rtc.c
+++ b/src/drivers/pc80/mc146818rtc.c
@@ -8,6 +8,9 @@
#include "option_table.h"
#include <cbfs.h>
#endif
+#if CONFIG_HAVE_ACPI_RESUME
+#include <arch/acpi.h>
+#endif
/* control registers - Moto names
*/
@@ -127,6 +130,7 @@ static void rtc_set_checksum(int range_start, int range_end, int cks_loc)
#endif
#endif
+#ifndef __SMM__
void rtc_init(int invalid)
{
int cmos_invalid = 0;
@@ -192,9 +196,20 @@ void rtc_init(int invalid)
PC_CKS_RANGE_END,PC_CKS_LOC);
#endif
+#if CONFIG_HAVE_ACPI_RESUME
+ /*
+ * Avoid clearing pending interrupts in the resume path because
+ * the Linux kernel relies on this to know if it should restart
+ * the RTC timerqueue if the wake was due to the RTC alarm.
+ */
+ if (acpi_slp_type == 3)
+ return;
+#endif
+
/* Clear any pending interrupts */
(void) cmos_read(RTC_INTR_FLAGS);
}
+#endif
#if CONFIG_USE_OPTION_TABLE