diff options
Diffstat (limited to 'drivers/gpu/drm/i915/intel_acpi.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_acpi.c | 286 |
1 files changed, 286 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_acpi.c b/drivers/gpu/drm/i915/intel_acpi.c new file mode 100644 index 00000000000..65c88f9ba12 --- /dev/null +++ b/drivers/gpu/drm/i915/intel_acpi.c @@ -0,0 +1,286 @@ +/* + * Intel ACPI functions + * + * _DSM related code stolen from nouveau_acpi.c. + */ +#include <linux/pci.h> +#include <linux/acpi.h> +#include <linux/vga_switcheroo.h> +#include <acpi/acpi_drivers.h> + +#include "drmP.h" + +#define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */ + +#define INTEL_DSM_FN_SUPPORTED_FUNCTIONS 0 /* No args */ +#define INTEL_DSM_FN_PLATFORM_MUX_INFO 1 /* No args */ + +static struct intel_dsm_priv { + acpi_handle dhandle; +} intel_dsm_priv; + +static const u8 intel_dsm_guid[] = { + 0xd3, 0x73, 0xd8, 0x7e, + 0xd0, 0xc2, + 0x4f, 0x4e, + 0xa8, 0x54, + 0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c +}; + +static int intel_dsm(acpi_handle handle, int func, int arg) +{ + struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; + struct acpi_object_list input; + union acpi_object params[4]; + union acpi_object *obj; + u32 result; + int ret = 0; + + input.count = 4; + input.pointer = params; + params[0].type = ACPI_TYPE_BUFFER; + params[0].buffer.length = sizeof(intel_dsm_guid); + params[0].buffer.pointer = (char *)intel_dsm_guid; + params[1].type = ACPI_TYPE_INTEGER; + params[1].integer.value = INTEL_DSM_REVISION_ID; + params[2].type = ACPI_TYPE_INTEGER; + params[2].integer.value = func; + params[3].type = ACPI_TYPE_INTEGER; + params[3].integer.value = arg; + + ret = acpi_evaluate_object(handle, "_DSM", &input, &output); + if (ret) { + DRM_DEBUG_DRIVER("failed to evaluate _DSM: %d\n", ret); + return ret; + } + + obj = (union acpi_object *)output.pointer; + + result = 0; + switch (obj->type) { + case ACPI_TYPE_INTEGER: + result = obj->integer.value; + break; + + case ACPI_TYPE_BUFFER: + if (obj->buffer.length == 4) { + result =(obj->buffer.pointer[0] | + (obj->buffer.pointer[1] << 8) | + (obj->buffer.pointer[2] << 16) | + (obj->buffer.pointer[3] << 24)); + break; + } + default: + ret = -EINVAL; + break; + } + if (result == 0x80000002) + ret = -ENODEV; + + kfree(output.pointer); + return ret; +} + +static char *intel_dsm_port_name(u8 id) +{ + switch (id) { + case 0: + return "Reserved"; + case 1: + return "Analog VGA"; + case 2: + return "LVDS"; + case 3: + return "Reserved"; + case 4: + return "HDMI/DVI_B"; + case 5: + return "HDMI/DVI_C"; + case 6: + return "HDMI/DVI_D"; + case 7: + return "DisplayPort_A"; + case 8: + return "DisplayPort_B"; + case 9: + return "DisplayPort_C"; + case 0xa: + return "DisplayPort_D"; + case 0xb: + case 0xc: + case 0xd: + return "Reserved"; + case 0xe: + return "WiDi"; + default: + return "bad type"; + } +} + +static char *intel_dsm_mux_type(u8 type) +{ + switch (type) { + case 0: + return "unknown"; + case 1: + return "No MUX, iGPU only"; + case 2: + return "No MUX, dGPU only"; + case 3: + return "MUXed between iGPU and dGPU"; + default: + return "bad type"; + } +} + +static void intel_dsm_platform_mux_info(void) +{ + struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; + struct acpi_object_list input; + union acpi_object params[4]; + union acpi_object *pkg; + int i, ret; + + input.count = 4; + input.pointer = params; + params[0].type = ACPI_TYPE_BUFFER; + params[0].buffer.length = sizeof(intel_dsm_guid); + params[0].buffer.pointer = (char *)intel_dsm_guid; + params[1].type = ACPI_TYPE_INTEGER; + params[1].integer.value = INTEL_DSM_REVISION_ID; + params[2].type = ACPI_TYPE_INTEGER; + params[2].integer.value = INTEL_DSM_FN_PLATFORM_MUX_INFO; + params[3].type = ACPI_TYPE_INTEGER; + params[3].integer.value = 0; + + ret = acpi_evaluate_object(intel_dsm_priv.dhandle, "_DSM", &input, + &output); + if (ret) { + DRM_DEBUG_DRIVER("failed to evaluate _DSM: %d\n", ret); + goto out; + } + + pkg = (union acpi_object *)output.pointer; + + if (pkg->type == ACPI_TYPE_PACKAGE) { + union acpi_object *connector_count = &pkg->package.elements[0]; + DRM_DEBUG_DRIVER("MUX info connectors: %lld\n", + (unsigned long long)connector_count->integer.value); + for (i = 1; i < pkg->package.count; i++) { + union acpi_object *obj = &pkg->package.elements[i]; + union acpi_object *connector_id = + &obj->package.elements[0]; + union acpi_object *info = &obj->package.elements[1]; + DRM_DEBUG_DRIVER("Connector id: 0x%016llx\n", + (unsigned long long)connector_id->integer.value); + DRM_DEBUG_DRIVER(" port id: %s\n", + intel_dsm_port_name(info->buffer.pointer[0])); + DRM_DEBUG_DRIVER(" display mux info: %s\n", + intel_dsm_mux_type(info->buffer.pointer[1])); + DRM_DEBUG_DRIVER(" aux/dc mux info: %s\n", + intel_dsm_mux_type(info->buffer.pointer[2])); + DRM_DEBUG_DRIVER(" hpd mux info: %s\n", + intel_dsm_mux_type(info->buffer.pointer[3])); + } + } else { + DRM_ERROR("MUX INFO call failed\n"); + } + +out: + kfree(output.pointer); +} + +static int intel_dsm_switchto(enum vga_switcheroo_client_id id) +{ + return 0; +} + +static int intel_dsm_power_state(enum vga_switcheroo_client_id id, + enum vga_switcheroo_state state) +{ + return 0; +} + +static int intel_dsm_init(void) +{ + return 0; +} + +static int intel_dsm_get_client_id(struct pci_dev *pdev) +{ + if (intel_dsm_priv.dhandle == DEVICE_ACPI_HANDLE(&pdev->dev)) + return VGA_SWITCHEROO_IGD; + else + return VGA_SWITCHEROO_DIS; +} + +static struct vga_switcheroo_handler intel_dsm_handler = { + .switchto = intel_dsm_switchto, + .power_state = intel_dsm_power_state, + .init = intel_dsm_init, + .get_client_id = intel_dsm_get_client_id, +}; + +static bool intel_dsm_pci_probe(struct pci_dev *pdev) +{ + acpi_handle dhandle, intel_handle; + acpi_status status; + int ret; + + dhandle = DEVICE_ACPI_HANDLE(&pdev->dev); + if (!dhandle) + return false; + + status = acpi_get_handle(dhandle, "_DSM", &intel_handle); + if (ACPI_FAILURE(status)) { + DRM_DEBUG_KMS("no _DSM method for intel device\n"); + return false; + } + + ret = intel_dsm(dhandle, INTEL_DSM_FN_SUPPORTED_FUNCTIONS, 0); + if (ret < 0) { + DRM_ERROR("failed to get supported _DSM functions\n"); + return false; + } + + intel_dsm_priv.dhandle = dhandle; + + intel_dsm_platform_mux_info(); + return true; +} + +static bool intel_dsm_detect(void) +{ + char acpi_method_name[255] = { 0 }; + struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name}; + struct pci_dev *pdev = NULL; + bool has_dsm = false; + int vga_count = 0; + + while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) { + vga_count++; + has_dsm |= intel_dsm_pci_probe(pdev); + } + + if (vga_count == 2 && has_dsm) { + acpi_get_name(intel_dsm_priv.dhandle, ACPI_FULL_PATHNAME, &buffer); + DRM_DEBUG_DRIVER("VGA switcheroo: detected DSM switching method %s handle\n", + acpi_method_name); + return true; + } + + return false; +} + +void intel_register_dsm_handler(void) +{ + if (!intel_dsm_detect()) + return; + + vga_switcheroo_register_handler(&intel_dsm_handler); +} + +void intel_unregister_dsm_handler(void) +{ + vga_switcheroo_unregister_handler(); +} |