diff options
| author | Len Brown <len.brown@intel.com> | 2008-10-23 03:19:45 (GMT) |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2008-10-23 03:19:45 (GMT) |
| commit | 6b3c4f8b9c417541c561155bf6b2150a81b5d5eb (patch) | |
| tree | 64d1a60ade7e5f2a0ad0e2d701b57f51aabd1f3d /drivers | |
| parent | 3fa8749e584b55f1180411ab1b51117190bac1e5 (diff) | |
| parent | 2fd47094f92fa2bdbf99be33294a7b6b97785a70 (diff) | |
| download | linux-6b3c4f8b9c417541c561155bf6b2150a81b5d5eb.tar.xz | |
Merge branch 'FW_BUG' into test
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/acpi/processor_perflib.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/drivers/acpi/processor_perflib.c b/drivers/acpi/processor_perflib.c index 80c251e..242f814 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) |