drm/msm: Move implicit sync handling to prepare_fb

In preparation for moving to atomic helpers, move the implicit sync
fence handling out of atomic commit and into the plane->prepare_fb()
hook. While we're at it, de-duplicate the mdp*_prepare_fb functions.

Changes in v4:
- Added
Reported-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>

drivers/gpu/drm/msm/disp/mdp4/mdp4_plane.c

@@ -98,21 +98,6 @@ static const struct drm_plane_funcs mdp4_plane_funcs = {
 		.atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
 };
 
-static int mdp4_plane_prepare_fb(struct drm_plane *plane,
-				 struct drm_plane_state *new_state)
-{
-	struct mdp4_plane *mdp4_plane = to_mdp4_plane(plane);
-	struct mdp4_kms *mdp4_kms = get_kms(plane);
-	struct msm_kms *kms = &mdp4_kms->base.base;
-	struct drm_framebuffer *fb = new_state->fb;
-
-	if (!fb)
-		return 0;
-
-	DBG("%s: prepare: FB[%u]", mdp4_plane->name, fb->base.id);
-	return msm_framebuffer_prepare(fb, kms->aspace);
-}
-
 static void mdp4_plane_cleanup_fb(struct drm_plane *plane,
 				  struct drm_plane_state *old_state)
 {
@@ -152,7 +137,7 @@ static void mdp4_plane_atomic_update(struct drm_plane *plane,
 }
 
 static const struct drm_plane_helper_funcs mdp4_plane_helper_funcs = {
-		.prepare_fb = mdp4_plane_prepare_fb,
+		.prepare_fb = msm_atomic_prepare_fb,
 		.cleanup_fb = mdp4_plane_cleanup_fb,
 		.atomic_check = mdp4_plane_atomic_check,
 		.atomic_update = mdp4_plane_atomic_update,

drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c

@@ -245,20 +245,6 @@ static const struct drm_plane_funcs mdp5_plane_funcs = {
 		.atomic_print_state = mdp5_plane_atomic_print_state,
 };
 
-static int mdp5_plane_prepare_fb(struct drm_plane *plane,
-				 struct drm_plane_state *new_state)
-{
-	struct mdp5_kms *mdp5_kms = get_kms(plane);
-	struct msm_kms *kms = &mdp5_kms->base.base;
-	struct drm_framebuffer *fb = new_state->fb;
-
-	if (!new_state->fb)
-		return 0;
-
-	DBG("%s: prepare: FB[%u]", plane->name, fb->base.id);
-	return msm_framebuffer_prepare(fb, kms->aspace);
-}
-
 static void mdp5_plane_cleanup_fb(struct drm_plane *plane,
 				  struct drm_plane_state *old_state)
 {
@@ -543,7 +529,7 @@ static void mdp5_plane_atomic_async_update(struct drm_plane *plane,
 }
 
 static const struct drm_plane_helper_funcs mdp5_plane_helper_funcs = {
-		.prepare_fb = mdp5_plane_prepare_fb,
+		.prepare_fb = msm_atomic_prepare_fb,
 		.cleanup_fb = mdp5_plane_cleanup_fb,
 		.atomic_check = mdp5_plane_atomic_check,
 		.atomic_update = mdp5_plane_atomic_update,

drivers/gpu/drm/msm/msm_atomic.c

@@ -16,6 +16,7 @@
  */
 
 #include "msm_drv.h"
+#include "msm_gem.h"
 #include "msm_kms.h"
 #include "msm_gem.h"
 #include "msm_fence.h"
@@ -97,6 +98,27 @@ static void msm_atomic_wait_for_commit_done(struct drm_device *dev,
 	}
 }
 
+int msm_atomic_prepare_fb(struct drm_plane *plane,
+			  struct drm_plane_state *new_state)
+{
+	struct msm_drm_private *priv = plane->dev->dev_private;
+	struct msm_kms *kms = priv->kms;
+	struct drm_gem_object *obj;
+	struct msm_gem_object *msm_obj;
+	struct dma_fence *fence;
+
+	if (!new_state->fb)
+		return 0;
+
+	obj = msm_framebuffer_bo(new_state->fb, 0);
+	msm_obj = to_msm_bo(obj);
+	fence = reservation_object_get_excl_rcu(msm_obj->resv);
+
+	drm_atomic_set_fence_for_plane(new_state, fence);
+
+	return msm_framebuffer_prepare(new_state->fb, kms->aspace);
+}
+
 static void msm_atomic_commit_tail(struct drm_atomic_state *state)
 {
 	struct drm_device *dev = state->dev;

drivers/gpu/drm/msm/msm_drv.h

@@ -160,6 +160,8 @@ struct msm_format {
 	uint32_t pixel_format;
 };
 
+int msm_atomic_prepare_fb(struct drm_plane *plane,
+			  struct drm_plane_state *new_state);
 int msm_atomic_commit(struct drm_device *dev,
 		struct drm_atomic_state *state, bool nonblock);
 struct drm_atomic_state *msm_atomic_state_alloc(struct drm_device *dev);