[Intel-gfx] [PATCH 5/6] drm/i915: Quick spring clean of intel_prepare_plane_fb()

[Chris Wilson]

Just a quick tidy now to make the next patch neater.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/intel_display.c | 43 +++++++++++++++++++++---------------
 1 file changed, 25 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 9fc4c5406a75..8925f9d6ecfd 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -13904,6 +13904,17 @@ static int intel_atomic_check(struct drm_device *dev,
 	return calc_watermark_data(state);
 }
 
+static bool old_plane_needs_modeset(struct drm_plane *plane,
+				    struct drm_plane_state *new_state)
+{
+	struct drm_crtc_state *crtc_state;
+
+	crtc_state = drm_atomic_get_existing_crtc_state(new_state->state,
+							plane->state->crtc);
+
+	return needs_modeset(crtc_state);
+}
+
 /**
  * intel_prepare_plane_fb - Prepare fb for usage on plane
  * @plane: drm plane to prepare for
@@ -13925,16 +13936,12 @@ intel_prepare_plane_fb(struct drm_plane *plane,
 	struct drm_device *dev = plane->dev;
 	struct drm_framebuffer *fb = new_state->fb;
 	struct drm_i915_gem_object *obj = intel_fb_obj(fb);
-	struct drm_i915_gem_object *old_obj = intel_fb_obj(plane->state->fb);
 	struct reservation_object *resv;
-	int ret = 0;
-
-	if (!obj && !old_obj)
-		return 0;
+	int ret;
 
-	if (old_obj) {
-		struct drm_crtc_state *crtc_state =
-			drm_atomic_get_existing_crtc_state(new_state->state, plane->state->crtc);
+	if (plane->state->fb && old_plane_needs_modeset(plane, new_state)) {
+		struct drm_i915_gem_object *old_obj =
+			intel_fb_obj(plane->state->fb);
 
 		/* Big Hammer, we also need to ensure that any pending
 		 * MI_WAIT_FOR_EVENT inside a user batch buffer on the
@@ -13947,8 +13954,8 @@ intel_prepare_plane_fb(struct drm_plane *plane,
 		 * This should only fail upon a hung GPU, in which case we
 		 * can safely continue.
 		 */
-		if (needs_modeset(crtc_state))
-			ret = i915_gem_object_wait_rendering(old_obj, true);
+
+		ret = i915_gem_object_wait_rendering(old_obj, true);
 		if (ret) {
 			/* GPU hangs should have been swallowed by the wait */
 			WARN_ON(ret == -EIO);
@@ -13976,25 +13983,25 @@ intel_prepare_plane_fb(struct drm_plane *plane,
 	    INTEL_INFO(dev)->cursor_needs_physical) {
 		int align = IS_I830(dev) ? 16 * 1024 : 256;
 		ret = i915_gem_object_attach_phys(obj, align);
-		if (ret)
+		if (ret) {
 			DRM_DEBUG_KMS("failed to attach phys object\n");
+			return ret;
+		}
 	} else {
 		struct i915_vma *vma;
 
 		vma = intel_pin_and_fence_fb_obj(fb, new_state->rotation);
 		if (IS_ERR(vma))
-			ret = PTR_ERR(vma);
+			return PTR_ERR(vma);
 
 		to_intel_plane_state(new_state)->vma = vma;
 	}
 
-	if (ret == 0) {
-		new_state->fence =
-			&i915_gem_active_get(&obj->last_write,
-					     &obj->base.dev->struct_mutex)->fence;
-	}
+	new_state->fence =
+		&i915_gem_active_get(&obj->last_write,
+				     &obj->base.dev->struct_mutex)->fence;
 
-	return ret;
+	return 0;
 }
 
 /**
-- 
2.9.3