Convert atmel-hlcdc to using __drm_atomic_helper_crtc_reset(), instead
of writing its own version. Instead of open coding destroy_state(),
call it directly for freeing the old state.

Signed-off-by: Maarten Lankhorst <maarten.lankho...@linux.intel.com>
Cc: Boris Brezillon <bbrezil...@kernel.org>
---
 .../gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c    | 29 +++++++------------
 1 file changed, 11 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c 
b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
index 8070a558d7b1..816161d0a09d 100644
--- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
@@ -400,24 +400,6 @@ void atmel_hlcdc_crtc_irq(struct drm_crtc *c)
        atmel_hlcdc_crtc_finish_page_flip(drm_crtc_to_atmel_hlcdc_crtc(c));
 }
 
-static void atmel_hlcdc_crtc_reset(struct drm_crtc *crtc)
-{
-       struct atmel_hlcdc_crtc_state *state;
-
-       if (crtc->state) {
-               __drm_atomic_helper_crtc_destroy_state(crtc->state);
-               state = drm_crtc_state_to_atmel_hlcdc_crtc_state(crtc->state);
-               kfree(state);
-               crtc->state = NULL;
-       }
-
-       state = kzalloc(sizeof(*state), GFP_KERNEL);
-       if (state) {
-               crtc->state = &state->base;
-               crtc->state->crtc = crtc;
-       }
-}
-
 static struct drm_crtc_state *
 atmel_hlcdc_crtc_duplicate_state(struct drm_crtc *crtc)
 {
@@ -447,6 +429,17 @@ static void atmel_hlcdc_crtc_destroy_state(struct drm_crtc 
*crtc,
        kfree(state);
 }
 
+static void atmel_hlcdc_crtc_reset(struct drm_crtc *crtc)
+{
+       struct atmel_hlcdc_crtc_state *state =
+               kzalloc(sizeof(*state), GFP_KERNEL);
+
+       if (crtc->state)
+               atmel_hlcdc_crtc_destroy_state(crtc, crtc->state);
+
+       __drm_atomic_helper_crtc_reset(crtc, &state->base);
+}
+
 static int atmel_hlcdc_crtc_enable_vblank(struct drm_crtc *c)
 {
        struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
-- 
2.20.1

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