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@@ -38,6 +38,7 @@
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#include <asm/uaccess.h>
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#endif
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+#include <asm/cpufeature.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/processor.h>
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@@ -334,7 +335,6 @@ static int acpi_processor_get_performance_info(struct acpi_processor *pr)
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acpi_status status = AE_OK;
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acpi_handle handle = NULL;
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-
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if (!pr || !pr->performance || !pr->handle)
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return -EINVAL;
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@@ -347,13 +347,25 @@ static int acpi_processor_get_performance_info(struct acpi_processor *pr)
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result = acpi_processor_get_performance_control(pr);
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if (result)
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- return result;
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+ goto update_bios;
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result = acpi_processor_get_performance_states(pr);
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if (result)
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- return result;
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+ goto update_bios;
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return 0;
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+
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+ /*
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+ * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
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+ * the BIOS is older than the CPU and does not know its frequencies
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+ */
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+ update_bios:
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+ if (ACPI_SUCCESS(acpi_get_handle(pr->handle, "_PPC", &handle))){
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+ if(boot_cpu_has(X86_FEATURE_EST))
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+ printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
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+ "frequency support\n");
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+ }
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+ return result;
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}
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int acpi_processor_notify_smm(struct module *calling_module)
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