diff options
author | Jaroslav Kysela <perex@perex.cz> | 2010-01-08 09:11:18 +0100 |
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committer | Jaroslav Kysela <perex@perex.cz> | 2010-01-08 09:11:18 +0100 |
commit | a4ad68d57e4dc4138304df23d1817eb094149389 (patch) | |
tree | ca7d8c4ce5377c4251560de06e15dd7be7063351 /drivers/acpi/processor_perflib.c | |
parent | cd9d95a55550555da8e587ead9cbba5f98a371a3 (diff) | |
parent | c97259df3f2e163c72f4d0685c61fb2e026dc989 (diff) |
Merge branch 'topic/hda' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6 into devel
Diffstat (limited to 'drivers/acpi/processor_perflib.c')
-rw-r--r-- | drivers/acpi/processor_perflib.c | 50 |
1 files changed, 47 insertions, 3 deletions
diff --git a/drivers/acpi/processor_perflib.c b/drivers/acpi/processor_perflib.c index 01e366d2b6fb..2cabadcc4d8c 100644 --- a/drivers/acpi/processor_perflib.c +++ b/drivers/acpi/processor_perflib.c @@ -152,15 +152,59 @@ static int acpi_processor_get_platform_limit(struct acpi_processor *pr) return 0; } -int acpi_processor_ppc_has_changed(struct acpi_processor *pr) +#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80 +/* + * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status + * @handle: ACPI processor handle + * @status: the status code of _PPC evaluation + * 0: success. OSPM is now using the performance state specificed. + * 1: failure. OSPM has not changed the number of P-states in use + */ +static void acpi_processor_ppc_ost(acpi_handle handle, int status) +{ + union acpi_object params[2] = { + {.type = ACPI_TYPE_INTEGER,}, + {.type = ACPI_TYPE_INTEGER,}, + }; + struct acpi_object_list arg_list = {2, params}; + acpi_handle temp; + + params[0].integer.value = ACPI_PROCESSOR_NOTIFY_PERFORMANCE; + params[1].integer.value = status; + + /* when there is no _OST , skip it */ + if (ACPI_FAILURE(acpi_get_handle(handle, "_OST", &temp))) + return; + + acpi_evaluate_object(handle, "_OST", &arg_list, NULL); + return; +} + +int acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag) { int ret; - if (ignore_ppc) + if (ignore_ppc) { + /* + * Only when it is notification event, the _OST object + * will be evaluated. Otherwise it is skipped. + */ + if (event_flag) + acpi_processor_ppc_ost(pr->handle, 1); return 0; + } ret = acpi_processor_get_platform_limit(pr); - + /* + * Only when it is notification event, the _OST object + * will be evaluated. Otherwise it is skipped. + */ + if (event_flag) { + if (ret < 0) + acpi_processor_ppc_ost(pr->handle, 1); + else + acpi_processor_ppc_ost(pr->handle, 0); + } if (ret < 0) return (ret); else |