diff options
| -rw-r--r-- | drivers/rtc/rtc-cmos.c | 26 |
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; |