DRM for platform devices

This modifies the DRM core in a small number of places to allow platform
devices to be used for direct rendering, alongside PCI devices.

Signed-off-by: Thomas White <taw@bitwiz.org.uk>

1 files changed, 27 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
index a75ca63deea..26005d93ad0 100644
--- a/drivers/gpu/drm/drm_drv.c
+++ b/drivers/gpu/drm/drm_drv.c
@@ -247,6 +247,7 @@ int drm_lastclose(struct drm_device * dev)
  */
 int drm_init(struct drm_driver *driver)
 {
+#ifdef CONFIG_PCI
 	struct pci_dev *pdev = NULL;
 	const struct pci_device_id *pid;
 	int i;
@@ -280,11 +281,37 @@ int drm_init(struct drm_driver *driver)
 			drm_get_dev(pdev, pid, driver);
 		}
 	}
+#endif
 	return 0;
 }
 
 EXPORT_SYMBOL(drm_init);
 
+/**
+ * Call this to associate a drm_driver with a platform_device.
+ *
+ * \return zero on success or a negative number on failure.
+ *
+ * This is a replacement for drm_init(), but for platform drivers.
+ * In this case, the caller must provide the matching platform_device
+ *
+ * since there is no physical bus to scan through.
+ *
+ * \sa drm_init
+ *
+ */
+int drm_platform_init(struct drm_driver *driver, struct platform_device *pdev,
+		      void *priv)
+{
+	DRM_DEBUG("\n");
+
+	INIT_LIST_HEAD(&driver->device_list);
+
+	return drm_get_platform_dev(pdev, driver, priv);
+}
+
+EXPORT_SYMBOL(drm_platform_init);
+
 void drm_exit(struct drm_driver *driver)
 {
 	struct drm_device *dev, *tmp;