diff options
Diffstat (limited to 'drivers/acpi/x86/utils.c')
| -rw-r--r-- | drivers/acpi/x86/utils.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/acpi/x86/utils.c b/drivers/acpi/x86/utils.c index c2b925f8cd4e..63d834dd3811 100644 --- a/drivers/acpi/x86/utils.c +++ b/drivers/acpi/x86/utils.c @@ -518,3 +518,38 @@ bool acpi_quirk_skip_acpi_ac_and_battery(void) return false; } EXPORT_SYMBOL_GPL(acpi_quirk_skip_acpi_ac_and_battery); + +/* This section provides a workaround for a specific x86 system + * which requires disabling of mwait to work correctly. + */ +static int __init acpi_proc_quirk_set_no_mwait(const struct dmi_system_id *id) +{ + pr_notice("%s detected - disabling mwait for CPU C-states\n", + id->ident); + boot_option_idle_override = IDLE_NOMWAIT; + return 0; +} + +static const struct dmi_system_id acpi_proc_quirk_mwait_dmi_table[] __initconst = { + { + .callback = acpi_proc_quirk_set_no_mwait, + .ident = "Extensa 5220", + .matches = { + DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), + DMI_MATCH(DMI_SYS_VENDOR, "Acer"), + DMI_MATCH(DMI_PRODUCT_VERSION, "0100"), + DMI_MATCH(DMI_BOARD_NAME, "Columbia"), + }, + .driver_data = NULL, + }, + {} +}; + +void __init acpi_proc_quirk_mwait_check(void) +{ + /* + * Check whether the system is DMI table. If yes, OSPM + * should not use mwait for CPU-states. + */ + dmi_check_system(acpi_proc_quirk_mwait_dmi_table); +} |