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-rw-r--r--drivers/rtc/rtc-cmos.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c
index 5171bade16f2..cd3a2411bc2f 100644
--- a/drivers/rtc/rtc-cmos.c
+++ b/drivers/rtc/rtc-cmos.c
@@ -43,6 +43,8 @@
#include <linux/of_platform.h>
#ifdef CONFIG_X86
#include <asm/i8259.h>
+#include <asm/processor.h>
+#include <linux/dmi.h>
#endif
/* this is for "generic access to PC-style RTC" using CMOS_READ/CMOS_WRITE */
@@ -1174,6 +1176,28 @@ static void rtc_wake_off(struct device *dev)
acpi_disable_event(ACPI_EVENT_RTC, 0);
}
+#ifdef CONFIG_X86
+/* Enable use_acpi_alarm mode for Intel platforms no earlier than 2015 */
+static void use_acpi_alarm_quirks(void)
+{
+ int year;
+
+ if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
+ return;
+
+ if (!(acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0))
+ return;
+
+ if (!is_hpet_enabled())
+ return;
+
+ if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year >= 2015)
+ use_acpi_alarm = true;
+}
+#else
+static inline void use_acpi_alarm_quirks(void) { }
+#endif
+
/* Every ACPI platform has a mc146818 compatible "cmos rtc". Here we find
* its device node and pass extra config data. This helps its driver use
* capabilities that the now-obsolete mc146818 didn't have, and informs it
@@ -1186,6 +1210,8 @@ static void cmos_wake_setup(struct device *dev)
if (acpi_disabled)
return;
+ use_acpi_alarm_quirks();
+
rtc_wake_setup(dev);
acpi_rtc_info.wake_on = rtc_wake_on;
acpi_rtc_info.wake_off = rtc_wake_off;