Add platform-wide _OSC support.
Signed-off-by: Shaohua Li <shaohua.li@xxxxxxxxx>
---
drivers/acpi/bus.c | 26 ++++++++++++++++++++++++++
include/linux/acpi.h | 7 +++++++
2 files changed, 33 insertions(+)
Index: linux/drivers/acpi/bus.c
===================================================================
--- linux.orig/drivers/acpi/bus.c 2009-10-29 10:26:43.000000000 +0800
+++ linux/drivers/acpi/bus.c 2009-10-29 10:31:58.000000000 +0800
@@ -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");
Index: linux/include/linux/acpi.h
===================================================================
--- linux.orig/include/linux/acpi.h 2009-10-29 10:29:30.000000000 +0800
+++ linux/include/linux/acpi.h 2009-10-29 10:31:06.000000000 +0800
@@ -273,6 +273,13 @@ struct acpi_osc_context {
acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context);
+/* platform-wide _OSC bits */
+#define OSC_SB_PAD_SUPPORT 1
+#define OSC_SB_PPC_OST_SUPPORT 2
+#define OSC_SB_PR3_SUPPORT 4
+#define OSC_SB_CPUHP_OST_SUPPORT 8
+#define OSC_SB_APEI_SUPPORT 16
+
/* PCI defined _OSC bits */
/* _OSC DW1 Definition (OS Support Fields) */
#define OSC_EXT_PCI_CONFIG_SUPPORT 1
--
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