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[ACPI] Prefer _CST over FADT for C-state capabilities 

Note: This ACPI standard compliance may cause regression
on some system, if they have _CST present, but _CST value
is bogus. "nocst" module parameter should workaround
that regression.

http://bugzilla.kernel.org/show_bug.cgi?id=5165

Signed-off-by: Venkatesh Pallipadi<venkatesh.pallipadi@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
(cherry picked from 883baf7f7e81cca26f4683ae0d25ba48f094cc08 commit)
hifive-unleashed-5.1
Venkatesh Pallipadi 2005-09-15 12:19:00 -04:00 committed by Len Brown
parent d2ef5ebb4c
commit 6d93c64803
1 changed files with 5 additions and 5 deletions
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10
drivers/acpi/processor_idle.c
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@ -690,7 +690,7 @@ static int acpi_processor_get_power_info_cst(struct acpi_processor *pr)
/* Validate number of power states discovered */
if (pr->power.count < 2)
status = -ENODEV;
status = -EFAULT;
end:
acpi_os_free(buffer.pointer);
@ -841,11 +841,11 @@ static int acpi_processor_get_power_info(struct acpi_processor *pr)
* this function */
result = acpi_processor_get_power_info_cst(pr);
if ((result) || (acpi_processor_power_verify(pr) < 2)) {
if (result == -ENODEV)
result = acpi_processor_get_power_info_fadt(pr);
if ((result) || (acpi_processor_power_verify(pr) < 2))
result = acpi_processor_get_power_info_default_c1(pr);
}
if ((result) || (acpi_processor_power_verify(pr) < 2))
result = acpi_processor_get_power_info_default_c1(pr);
/*
* Set Default Policy