Remove the common code from the driver and use the
drm_fb_cma_extract_and_attach_fence() helper instead.
Moveover, call the helper from prepare_fb() plane hook .

Signed-off-by: Marek Vasut <marex at denx.de>
Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
Cc: Lucas Stach <l.stach at pengutronix.de>
---
V2: - Rename the function to drm_fb_cma_extract_and_attach_fence()
    - Add missing newline
---
 drivers/gpu/drm/imx/imx-drm-core.c | 30 +-----------------------------
 drivers/gpu/drm/imx/ipuv3-plane.c  |  9 +++++++++
 2 files changed, 10 insertions(+), 29 deletions(-)

diff --git a/drivers/gpu/drm/imx/imx-drm-core.c 
b/drivers/gpu/drm/imx/imx-drm-core.c
index 98df09c..c7faa1f 100644
--- a/drivers/gpu/drm/imx/imx-drm-core.c
+++ b/drivers/gpu/drm/imx/imx-drm-core.c
@@ -18,7 +18,6 @@
 #include <linux/dma-buf.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
-#include <linux/reservation.h>
 #include <drm/drmP.h>
 #include <drm/drm_atomic.h>
 #include <drm/drm_atomic_helper.h>
@@ -151,38 +150,11 @@ static int imx_drm_atomic_check(struct drm_device *dev,
        return ret;
 }

-static int imx_drm_atomic_commit(struct drm_device *dev,
-                                struct drm_atomic_state *state,
-                                bool nonblock)
-{
-       struct drm_plane_state *plane_state;
-       struct drm_plane *plane;
-       struct dma_buf *dma_buf;
-       int i;
-
-       /*
-        * If the plane fb has an dma-buf attached, fish out the exclusive
-        * fence for the atomic helper to wait on.
-        */
-       for_each_plane_in_state(state, plane, plane_state, i) {
-               if ((plane->state->fb != plane_state->fb) && plane_state->fb) {
-                       dma_buf = drm_fb_cma_get_gem_obj(plane_state->fb,
-                                                        0)->base.dma_buf;
-                       if (!dma_buf)
-                               continue;
-                       plane_state->fence =
-                               reservation_object_get_excl_rcu(dma_buf->resv);
-               }
-       }
-
-       return drm_atomic_helper_commit(dev, state, nonblock);
-}
-
 static const struct drm_mode_config_funcs imx_drm_mode_config_funcs = {
        .fb_create = drm_fb_cma_create,
        .output_poll_changed = imx_drm_output_poll_changed,
        .atomic_check = imx_drm_atomic_check,
-       .atomic_commit = imx_drm_atomic_commit,
+       .atomic_commit = drm_atomic_helper_commit,
 };

 static void imx_drm_atomic_commit_tail(struct drm_atomic_state *state)
diff --git a/drivers/gpu/drm/imx/ipuv3-plane.c 
b/drivers/gpu/drm/imx/ipuv3-plane.c
index ce22d0a..eb115a3 100644
--- a/drivers/gpu/drm/imx/ipuv3-plane.c
+++ b/drivers/gpu/drm/imx/ipuv3-plane.c
@@ -250,6 +250,14 @@ static const struct drm_plane_funcs ipu_plane_funcs = {
        .atomic_destroy_state   = drm_atomic_helper_plane_destroy_state,
 };

+static int ipu_plane_prepare_fb(struct drm_plane *plane,
+                               struct drm_plane_state *state)
+{
+       drm_fb_cma_extract_and_attach_fence(plane, state);
+
+       return 0;
+}
+
 static int ipu_plane_atomic_check(struct drm_plane *plane,
                                  struct drm_plane_state *state)
 {
@@ -442,6 +450,7 @@ static void ipu_plane_atomic_update(struct drm_plane *plane,
 }

 static const struct drm_plane_helper_funcs ipu_plane_helper_funcs = {
+       .prepare_fb = ipu_plane_prepare_fb,
        .atomic_check = ipu_plane_atomic_check,
        .atomic_disable = ipu_plane_atomic_disable,
        .atomic_update = ipu_plane_atomic_update,
-- 
2.9.3

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