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ACPI: Unconditionally set SCI_EN on resume

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The ACPI spec tells us that the firmware will reenable SCI_EN on resume.
Reality disagrees in some cases. The ACPI spec tells us that the only way
to set SCI_EN is via an SMM call.
https://bugzilla.kernel.org/show_bug.cgi?id=13745 shows us that doing so
may break machines. Tracing the ACPI calls made by Windows shows that it
unconditionally sets SCI_EN on resume with a direct register write, and
therefore the overwhelming probability is that everything is fine with
this behaviour.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Tested-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Matthew Garrett
2010-05-11 13:49:25 -04:00
committed by Len Brown
parent b430acbd7c
commit b6dacf63e9
3 changed files with 2 additions and 158 deletions
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include/linux/acpi.h
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@@ -251,7 +251,6 @@ int acpi_check_mem_region(resource_size_t start, resource_size_t n,
void __init acpi_no_s4_hw_signature(void);
void __init acpi_old_suspend_ordering(void);
void __init acpi_s4_no_nvs(void);
void __init acpi_set_sci_en_on_resume(void);
#endif /* CONFIG_PM_SLEEP */
struct acpi_osc_context {