diff options
Diffstat (limited to 'drivers/acpi/sleep/main.c')
| -rw-r--r-- | drivers/acpi/sleep/main.c | 40 |
1 files changed, 39 insertions, 1 deletions
diff --git a/drivers/acpi/sleep/main.c b/drivers/acpi/sleep/main.c index 80c0868d0480..28a691cc625e 100644 --- a/drivers/acpi/sleep/main.c +++ b/drivers/acpi/sleep/main.c @@ -90,6 +90,18 @@ void __init acpi_old_suspend_ordering(void) old_suspend_ordering = true; } +/* + * According to the ACPI specification the BIOS should make sure that ACPI is + * enabled and SCI_EN bit is set on wake-up from S1 - S3 sleep states. Still, + * some BIOSes don't do that and therefore we use acpi_enable() to enable ACPI + * on such systems during resume. Unfortunately that doesn't help in + * particularly pathological cases in which SCI_EN has to be set directly on + * resume, although the specification states very clearly that this flag is + * owned by the hardware. The set_sci_en_on_resume variable will be set in such + * cases. + */ +static bool set_sci_en_on_resume; + /** * acpi_pm_disable_gpes - Disable the GPEs. */ @@ -235,7 +247,11 @@ static int acpi_suspend_enter(suspend_state_t pm_state) } /* If ACPI is not enabled by the BIOS, we need to enable it here. */ - acpi_enable(); + if (set_sci_en_on_resume) + acpi_set_register(ACPI_BITREG_SCI_ENABLE, 1); + else + acpi_enable(); + /* Reprogram control registers and execute _BFS */ acpi_leave_sleep_state_prep(acpi_state); @@ -323,6 +339,12 @@ static int __init init_old_suspend_ordering(const struct dmi_system_id *d) return 0; } +static int __init init_set_sci_en_on_resume(const struct dmi_system_id *d) +{ + set_sci_en_on_resume = true; + return 0; +} + static struct dmi_system_id __initdata acpisleep_dmi_table[] = { { .callback = init_old_suspend_ordering, @@ -340,6 +362,22 @@ static struct dmi_system_id __initdata acpisleep_dmi_table[] = { DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"), }, }, + { + .callback = init_set_sci_en_on_resume, + .ident = "Apple MacBook 1,1", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."), + DMI_MATCH(DMI_PRODUCT_NAME, "MacBook1,1"), + }, + }, + { + .callback = init_set_sci_en_on_resume, + .ident = "Apple MacMini 1,1", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."), + DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"), + }, + }, {}, }; #endif /* CONFIG_SUSPEND */ |