drm: Add drm_crtc_init_with_planes() (v2)

Add a new drm_crtc_init_with_planes() to allow drivers to provide
specific primary and cursor planes at CRTC initialization.  The existing
drm_crtc_init() interface remains to avoid driver churn in existing
drivers; it will initialize the CRTC with a plane helper-created primary
plane and no cursor plane.

v2:
  - Move drm_crtc_init() to plane helper file so that nothing in the DRM
    core depends on helpers.  [suggested by Daniel Vetter]
  - Keep cursor parameter to drm_crtc_init_with_planes() a void* until
    we actually add cursor support.  [suggested by Daniel Vetter]

Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Rob Clark <robdclark@gmail.com>

2 files changed, 36 insertions, 4 deletions

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index eb2165954f18..110e5ce117f5 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -692,9 +692,12 @@ void drm_framebuffer_remove(struct drm_framebuffer *fb)
 EXPORT_SYMBOL(drm_framebuffer_remove);
 
 /**
- * drm_crtc_init - Initialise a new CRTC object
+ * drm_crtc_init_with_planes - Initialise a new CRTC object with
+ *    specified primary and cursor planes.
  * @dev: DRM device
  * @crtc: CRTC object to init
+ * @primary: Primary plane for CRTC
+ * @cursor: Cursor plane for CRTC
  * @funcs: callbacks for the new CRTC
  *
  * Inits a new object created as base part of a driver crtc object.
@@ -702,8 +705,10 @@ EXPORT_SYMBOL(drm_framebuffer_remove);
  * Returns:
  * Zero on success, error code on failure.
  */
-int drm_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
-		   const struct drm_crtc_funcs *funcs)
+int drm_crtc_init_with_planes(struct drm_device *dev, struct drm_crtc *crtc,
+			      struct drm_plane *primary,
+			      void *cursor,
+			      const struct drm_crtc_funcs *funcs)
 {
 	int ret;
 
@@ -724,12 +729,16 @@ int drm_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
 	list_add_tail(&crtc->head, &dev->mode_config.crtc_list);
 	dev->mode_config.num_crtc++;
 
+	crtc->primary = primary;
+	if (primary)
+		primary->possible_crtcs = 1 << drm_crtc_index(crtc);
+
  out:
 	drm_modeset_unlock_all(dev);
 
 	return ret;
 }
-EXPORT_SYMBOL(drm_crtc_init);
+EXPORT_SYMBOL(drm_crtc_init_with_planes);
 
 /**
  * drm_crtc_cleanup - Clean up the core crtc usage
@@ -2219,6 +2228,8 @@ int drm_mode_set_config_internal(struct drm_mode_set *set)
 
 	ret = crtc->funcs->set_config(set);
 	if (ret == 0) {
+		crtc->primary->crtc = crtc;
+
 		/* crtc->fb must be updated by ->set_config, enforces this. */
 		WARN_ON(fb != crtc->fb);
 	}
diff --git a/drivers/gpu/drm/drm_plane_helper.c b/drivers/gpu/drm/drm_plane_helper.c
index 2f2374aba42e..e768d35ff22e 100644
--- a/drivers/gpu/drm/drm_plane_helper.c
+++ b/drivers/gpu/drm/drm_plane_helper.c
@@ -310,3 +310,24 @@ struct drm_plane *drm_primary_helper_create_plane(struct drm_device *dev,
 }
 EXPORT_SYMBOL(drm_primary_helper_create_plane);
 
+/**
+ * drm_crtc_init - Legacy CRTC initialization function
+ * @dev: DRM device
+ * @crtc: CRTC object to init
+ * @funcs: callbacks for the new CRTC
+ *
+ * Initialize a CRTC object with a default helper-provided primary plane and no
+ * cursor plane.
+ *
+ * Returns:
+ * Zero on success, error code on failure.
+ */
+int drm_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
+		  const struct drm_crtc_funcs *funcs)
+{
+	struct drm_plane *primary;
+
+	primary = drm_primary_helper_create_plane(dev, NULL, 0);
+	return drm_crtc_init_with_planes(dev, crtc, primary, NULL, funcs);
+}
+EXPORT_SYMBOL(drm_crtc_init);