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ACPI / EC: Use ec_no_wakeup on Thinkpad X1 Carbon 6th

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On this system EC interrupt triggers constantly kicking devices out of
low power states and thus blocking power management. The system also has
a PCIe root port hosting Alpine Ridge Thunderbolt controller and it
never gets a chance to go to D3cold because of this.

Since the power button works the same regardless if EC interrupt is
enabled or not during s2idle, add a quirk for this machine that sets
ec_no_wakeup=true preventing spurious wakeups.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Mika Westerberg 2018-06-18 14:17:16 +03:00 committed by Rafael J. Wysocki
parent ce397d215c
commit 8195a655e5
1 changed files with 20 additions and 0 deletions
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20
drivers/acpi/ec.c
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@ -2037,6 +2037,17 @@ static inline void acpi_ec_query_exit(void)
}
}
static const struct dmi_system_id acpi_ec_no_wakeup[] = {
{
.ident = "Thinkpad X1 Carbon 6th",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
DMI_MATCH(DMI_PRODUCT_NAME, "20KGS3JF01"),
},
},
{ },
};
int __init acpi_ec_init(void)
{
int result;
@ -2047,6 +2058,15 @@ int __init acpi_ec_init(void)
if (result)
return result;
/*
* Disable EC wakeup on following systems to prevent periodic
* wakeup from EC GPE.
*/
if (dmi_check_system(acpi_ec_no_wakeup)) {
ec_no_wakeup = true;
pr_debug("Disabling EC wakeup on suspend-to-idle\n");
}
/* Drivers must be started after acpi_ec_query_init() */
dsdt_fail = acpi_bus_register_driver(&acpi_ec_driver);
/*