[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)
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@ -690,7 +690,7 @@ static int acpi_processor_get_power_info_cst(struct acpi_processor *pr)
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/* Validate number of power states discovered */
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if (pr->power.count < 2)
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status = -ENODEV;
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status = -EFAULT;
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end:
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acpi_os_free(buffer.pointer);
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@ -841,11 +841,11 @@ static int acpi_processor_get_power_info(struct acpi_processor *pr)
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* this function */
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result = acpi_processor_get_power_info_cst(pr);
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if ((result) || (acpi_processor_power_verify(pr) < 2)) {
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if (result == -ENODEV)
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result = acpi_processor_get_power_info_fadt(pr);
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if ((result) || (acpi_processor_power_verify(pr) < 2))
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result = acpi_processor_get_power_info_default_c1(pr);
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}
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if ((result) || (acpi_processor_power_verify(pr) < 2))
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result = acpi_processor_get_power_info_default_c1(pr);
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/*
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* Set Default Policy
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