Convert vc4 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: Eric Anholt <e...@anholt.net>
---
 drivers/gpu/drm/vc4/vc4_crtc.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
index e7c04a9eb219..fdf21594b050 100644
--- a/drivers/gpu/drm/vc4/vc4_crtc.c
+++ b/drivers/gpu/drm/vc4/vc4_crtc.c
@@ -1041,12 +1041,13 @@ static void vc4_crtc_destroy_state(struct drm_crtc 
*crtc,
 static void
 vc4_crtc_reset(struct drm_crtc *crtc)
 {
-       if (crtc->state)
-               vc4_crtc_destroy_state(crtc->state);
+       struct vc4_crtc_state *crtc_state =
+               kzalloc(sizeof(*crtc_state), GFP_KERNEL);
 
-       crtc->state = kzalloc(sizeof(struct vc4_crtc_state), GFP_KERNEL);
        if (crtc->state)
-               crtc->state->crtc = crtc;
+               vc4_crtc_destroy_state(crtc, crtc->state);
+
+       __drm_atomic_helper_crtc_reset(crtc, &crtc_state->base);
 }
 
 static const struct drm_crtc_funcs vc4_crtc_funcs = {
-- 
2.20.1

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