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authorLen Brown <len.brown@intel.com>2008-10-22 23:19:45 -0400
committerLen Brown <len.brown@intel.com>2008-10-22 23:19:45 -0400
commit6b3c4f8b9c417541c561155bf6b2150a81b5d5eb (patch)
tree64d1a60ade7e5f2a0ad0e2d701b57f51aabd1f3d /drivers/acpi
parent3fa8749e584b55f1180411ab1b51117190bac1e5 (diff)
parent2fd47094f92fa2bdbf99be33294a7b6b97785a70 (diff)
Merge branch 'FW_BUG' into test
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/processor_perflib.c18
1 files changed, 15 insertions, 3 deletions
diff --git a/drivers/acpi/processor_perflib.c b/drivers/acpi/processor_perflib.c
index 80c251ec6d2..242f8143008 100644
--- a/drivers/acpi/processor_perflib.c
+++ b/drivers/acpi/processor_perflib.c
@@ -38,6 +38,7 @@
#include <asm/uaccess.h>
#endif
+#include <asm/cpufeature.h>
#include <acpi/acpi_bus.h>
#include <acpi/processor.h>
@@ -334,7 +335,6 @@ static int acpi_processor_get_performance_info(struct acpi_processor *pr)
acpi_status status = AE_OK;
acpi_handle handle = NULL;
-
if (!pr || !pr->performance || !pr->handle)
return -EINVAL;
@@ -347,13 +347,25 @@ static int acpi_processor_get_performance_info(struct acpi_processor *pr)
result = acpi_processor_get_performance_control(pr);
if (result)
- return result;
+ goto update_bios;
result = acpi_processor_get_performance_states(pr);
if (result)
- return result;
+ goto update_bios;
return 0;
+
+ /*
+ * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
+ * the BIOS is older than the CPU and does not know its frequencies
+ */
+ update_bios:
+ if (ACPI_SUCCESS(acpi_get_handle(pr->handle, "_PPC", &handle))){
+ if(boot_cpu_has(X86_FEATURE_EST))
+ printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
+ "frequency support\n");
+ }
+ return result;
}
int acpi_processor_notify_smm(struct module *calling_module)