drm/i915: add _DSM support
The _DSM method on the integrated graphics device can tell us which
connectors are muxable, so add support for making the call and parsing
out the connector info.
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
[ickle: fix compiler warnings for using uninitialized 'result' and
downgrade error message for non-switchable devices]
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
diff --git a/drivers/gpu/drm/i915/intel_acpi.c b/drivers/gpu/drm/i915/intel_acpi.c
new file mode 100644
index 0000000..65c88f9
--- /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();
+}