drm/i915: add _DSM support
authorJesse Barnes <jbarnes@virtuousgeek.org>
Thu, 7 Oct 2010 23:01:13 +0000 (16:01 -0700)
committerChris Wilson <chris@chris-wilson.co.uk>
Fri, 8 Oct 2010 09:27:43 +0000 (10:27 +0100)
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>
drivers/gpu/drm/i915/Makefile
drivers/gpu/drm/i915/i915_dma.c
drivers/gpu/drm/i915/i915_drv.h
drivers/gpu/drm/i915/intel_acpi.c [new file with mode: 0644]
drivers/gpu/drm/i915/intel_display.c

index f6e98dd416c9085d662042fd14655b66f03c4880..fdc833d5cc7b473eb2f69cb2e856aaf8811215ce 100644 (file)
@@ -35,6 +35,8 @@ i915-y := i915_drv.o i915_dma.o i915_irq.o i915_mem.o \
 
 i915-$(CONFIG_COMPAT)   += i915_ioc32.o
 
+i915-$(CONFIG_ACPI)    += intel_acpi.o
+
 obj-$(CONFIG_DRM_I915)  += i915.o
 
 CFLAGS_i915_trace_points.o := -I$(src)
index 3bbe72352cd88ac381e2dd01b9ac8567251c38fd..f451af69d4377bb238300e11075b0033a448405d 100644 (file)
@@ -1244,6 +1244,8 @@ static int i915_load_modeset_init(struct drm_device *dev,
        if (ret)
                goto cleanup_ringbuffer;
 
+       intel_register_dsm_handler();
+
        ret = vga_switcheroo_register_client(dev->pdev,
                                             i915_switcheroo_set_state,
                                             i915_switcheroo_can_switch);
index 73ad8bff2c2a7ab833dbad13156453e5d9c2569d..e4ffcd3a7aefa05841b699b463da57323fa62255 100644 (file)
@@ -1136,6 +1136,15 @@ static inline void intel_opregion_gse_intr(struct drm_device *dev) { return; }
 static inline void intel_opregion_enable_asle(struct drm_device *dev) { return; }
 #endif
 
+/* intel_acpi.c */
+#ifdef CONFIG_ACPI
+extern void intel_register_dsm_handler(void);
+extern void intel_unregister_dsm_handler(void);
+#else
+static inline void intel_register_dsm_handler(void) { return; }
+static inline void intel_unregister_dsm_handler(void) { return; }
+#endif /* CONFIG_ACPI */
+
 /* modesetting */
 extern void intel_modeset_init(struct drm_device *dev);
 extern void intel_modeset_cleanup(struct drm_device *dev);
diff --git a/drivers/gpu/drm/i915/intel_acpi.c b/drivers/gpu/drm/i915/intel_acpi.c
new file mode 100644 (file)
index 0000000..65c88f9
--- /dev/null
@@ -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();
+}
index 4c44e1663a9557c5a24ffa5b0b2d4b4f0826a0e4..349710a8014c43ae52b32d4f6d6b51ae004c7f4f 100644 (file)
@@ -6127,6 +6127,9 @@ void intel_modeset_cleanup(struct drm_device *dev)
        drm_kms_helper_poll_fini(dev);
        mutex_lock(&dev->struct_mutex);
 
+       intel_unregister_dsm_handler();
+
+
        list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
                /* Skip inactive CRTCs */
                if (!crtc->fb)