[PATCH v6 06/15] drm/atomic: Create function to insert plane state into a commit

[Maxime Ripard <mripard@kernel.org>]

drm_atomic_get_plane_state() allocates a new plane state by
duplicating the current one and inserts it into the atomic commit as
a single operation.

However, a later change will need to insert a plane state into a
commit without going through the full allocation and duplication path
in drm_atomic_get_plane_state().

Extract the state insertion logic into a new static
drm_atomic_commit_set_plane_state() helper, and convert
drm_atomic_get_plane_state() to use it.

Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Signed-off-by: Maxime Ripard <mripard@kernel.org>
---
 drivers/gpu/drm/drm_atomic.c | 23 +++++++++++++++++------
 1 file changed, 17 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 178eca95d0e3..b26458ee98d8 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -631,4 +631,19 @@ static int drm_atomic_connector_check(struct drm_connector *connector,
 }
 
+static void drm_atomic_commit_set_plane_state(struct drm_atomic_commit *commit,
+					      struct drm_plane *plane,
+					      struct drm_plane_state *plane_state)
+{
+	int index = drm_plane_index(plane);
+
+	drm_modeset_lock_assert_held(&plane->mutex);
+
+	commit->planes[index].state_to_destroy = plane_state;
+	commit->planes[index].old_state = plane->state;
+	commit->planes[index].new_state = plane_state;
+	commit->planes[index].ptr = plane;
+	plane_state->state = commit;
+}
+
 /**
  * drm_atomic_get_plane_state - get plane state
@@ -649,5 +664,5 @@ drm_atomic_get_plane_state(struct drm_atomic_commit *state,
 			  struct drm_plane *plane)
 {
-	int ret, index = drm_plane_index(plane);
+	int ret;
 	struct drm_plane_state *plane_state;
 
@@ -672,9 +687,5 @@ drm_atomic_get_plane_state(struct drm_atomic_commit *state,
 		return ERR_PTR(-ENOMEM);
 
-	state->planes[index].state_to_destroy = plane_state;
-	state->planes[index].ptr = plane;
-	state->planes[index].old_state = plane->state;
-	state->planes[index].new_state = plane_state;
-	plane_state->state = state;
+	drm_atomic_commit_set_plane_state(state, plane, plane_state);
 
 	drm_dbg_atomic(plane->dev, "Added [PLANE:%d:%s] %p state to %p\n",

-- 
2.55.0