#include <asm/uaccess.h>
#endif
+#ifdef CONFIG_X86
+#include <asm/cpufeature.h>
+#endif
+
#include <acpi/acpi_bus.h>
#include <acpi/processor.h>
static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
{
acpi_status status = 0;
- unsigned long ppc = 0;
+ unsigned long long ppc = 0;
if (!pr)
acpi_status status = AE_OK;
acpi_handle handle = NULL;
-
if (!pr || !pr->performance || !pr->handle)
return -EINVAL;
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:
+#ifdef CONFIG_X86
+ 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");
+ }
+#endif
+ return result;
}
int acpi_processor_notify_smm(struct module *calling_module)