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| author | Peter Lekensteyn <lekensteyn@gmail.com> | 2011-12-17 12:53:43 +0100 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2012-01-13 09:09:07 +0000 |
| commit | 9075e85f46c598e4dfc852b16b256a32e2fb396f (patch) | |
| tree | 841922a76fb85d8cbcaa7d6f64b5ea6c4d067370 | |
| parent | 3b32a592ea6e49145d4dc610b85dd9042226896d (diff) | |
| download | linux-9075e85f46c598e4dfc852b16b256a32e2fb396f.tar.gz linux-9075e85f46c598e4dfc852b16b256a32e2fb396f.tar.bz2 linux-9075e85f46c598e4dfc852b16b256a32e2fb396f.zip | |
nouveau: properly check for _DSM function support
According to the ACPI spec version 4, section 9.14.1, _DSM functions
must return a value with the first bit enabled if any DSM functions are
supported for the given UUID and revision ID. For a given function index n
to be marked supported, bit n must be enabled.
Signed-off-by: Peter Lekensteyn <lekensteyn@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
| -rw-r--r-- | drivers/gpu/drm/nouveau/nouveau_acpi.c | 35 |
1 files changed, 22 insertions, 13 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_acpi.c b/drivers/gpu/drm/nouveau/nouveau_acpi.c index 525744d593c1..96756d0d6411 100644 --- a/drivers/gpu/drm/nouveau/nouveau_acpi.c +++ b/drivers/gpu/drm/nouveau/nouveau_acpi.c @@ -18,12 +18,6 @@ #include <linux/vga_switcheroo.h> -#define NOUVEAU_DSM_SUPPORTED 0x00 -#define NOUVEAU_DSM_SUPPORTED_FUNCTIONS 0x00 - -#define NOUVEAU_DSM_ACTIVE 0x01 -#define NOUVEAU_DSM_ACTIVE_QUERY 0x00 - #define NOUVEAU_DSM_LED 0x02 #define NOUVEAU_DSM_LED_STATE 0x00 #define NOUVEAU_DSM_LED_OFF 0x10 @@ -35,6 +29,7 @@ #define NOUVEAU_DSM_POWER_SPEED 0x01 #define NOUVEAU_DSM_POWER_STAMINA 0x02 +#define NOUVEAU_DSM_OPTIMUS_FN 0x1A static struct nouveau_dsm_priv { bool dsm_detected; bool optimus_detected; @@ -148,6 +143,23 @@ static int nouveau_dsm(acpi_handle handle, int func, int arg, uint32_t *result) return 0; } +/* Returns 1 if a DSM function is usable and 0 otherwise */ +static int nouveau_test_dsm(acpi_handle test_handle, + int (*dsm_func)(acpi_handle, int, int, uint32_t *), + int sfnc) +{ + u32 result = 0; + + /* Function 0 returns a Buffer containing available functions. The args + * parameter is ignored for function 0, so just put 0 in it */ + if (dsm_func(test_handle, 0, 0, &result)) + return 0; + + /* ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported. If + * the n-th bit is enabled, function n is supported */ + return result & 1 && result & (1 << sfnc); +} + static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id) { mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0); @@ -212,8 +224,7 @@ static int nouveau_dsm_pci_probe(struct pci_dev *pdev) { acpi_handle dhandle, nvidia_handle; acpi_status status; - int ret, retval = 0; - uint32_t result; + int retval = 0; dhandle = DEVICE_ACPI_HANDLE(&pdev->dev); if (!dhandle) @@ -224,13 +235,11 @@ static int nouveau_dsm_pci_probe(struct pci_dev *pdev) return false; } - ret = nouveau_dsm(dhandle, NOUVEAU_DSM_SUPPORTED, - NOUVEAU_DSM_SUPPORTED_FUNCTIONS, &result); - if (ret == 0) + if (nouveau_test_dsm(dhandle, nouveau_dsm, NOUVEAU_DSM_POWER)) retval |= NOUVEAU_DSM_HAS_MUX; - ret = nouveau_optimus_dsm(dhandle, 0, 0, &result); - if (ret == 0) + if (nouveau_test_dsm(dhandle, nouveau_optimus_dsm, + NOUVEAU_DSM_OPTIMUS_FN)) retval |= NOUVEAU_DSM_HAS_OPT; if (retval) |