From 3563ff964fdc36358cef0330936fdac28e65142a Mon Sep 17 00:00:00 2001 From: Shaohua Li Date: Thu, 29 Oct 2009 11:05:05 +0800 Subject: [PATCH] ACPI: Add platform-wide _OSC support. Signed-off-by: Shaohua Li Signed-off-by: Len Brown --- drivers/acpi/bus.c | 26 ++++++++++++++++++++++++++ include/linux/acpi.h | 7 +++++++ 2 files changed, 33 insertions(+) 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"); diff --git a/include/linux/acpi.h b/include/linux/acpi.h index 535beecc37cf..e11090d462d2 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -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 -- 2.34.1