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authorShaohua Li <shaohua.li@intel.com>2009-10-29 04:05:05 +0100
committerLen Brown <len.brown@intel.com>2009-12-16 20:05:34 +0100
commit3563ff964fdc36358cef0330936fdac28e65142a (patch)
tree5815c93ce3c6adc57f9b8c73113ee77605a1b0ef /drivers
parentACPI: cleanup pci_root _OSC code. (diff)
downloadlinux-3563ff964fdc36358cef0330936fdac28e65142a.tar.xz
linux-3563ff964fdc36358cef0330936fdac28e65142a.zip
ACPI: Add platform-wide _OSC support.
Signed-off-by: Shaohua Li <shaohua.li@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/acpi/bus.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 12240be58f27..65f7e335f122 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -466,6 +466,30 @@ out_kfree:
}
EXPORT_SYMBOL(acpi_run_osc);
+static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
+static void acpi_bus_osc_support(void)
+{
+ u32 capbuf[2];
+ struct acpi_osc_context context = {
+ .uuid_str = sb_uuid_str,
+ .rev = 1,
+ .cap.length = 8,
+ .cap.pointer = capbuf,
+ };
+ acpi_handle handle;
+
+ capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
+ capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
+#ifdef CONFIG_ACPI_PROCESSOR_AGGREGATOR
+ capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
+#endif
+ if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
+ return;
+ if (ACPI_SUCCESS(acpi_run_osc(handle, &context)))
+ kfree(context.ret.pointer);
+ /* do we need to check the returned cap? Sounds no */
+}
+
/* --------------------------------------------------------------------------
Event Management
-------------------------------------------------------------------------- */
@@ -856,6 +880,8 @@ static int __init acpi_bus_init(void)
status = acpi_ec_ecdt_probe();
/* Ignore result. Not having an ECDT is not fatal. */
+ acpi_bus_osc_support();
+
status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
if (ACPI_FAILURE(status)) {
printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");