Convert tegra 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: Thierry Reding <thierry.red...@gmail.com>
Cc: Jonathan Hunter <jonath...@nvidia.com>
Cc: linux-te...@vger.kernel.org
---
 drivers/gpu/drm/tegra/dc.c | 30 +++++++++++-------------------
 1 file changed, 11 insertions(+), 19 deletions(-)

diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c
index 607a6ea17ecc..57c88d78cdaa 100644
--- a/drivers/gpu/drm/tegra/dc.c
+++ b/drivers/gpu/drm/tegra/dc.c
@@ -1153,25 +1153,6 @@ static void tegra_dc_destroy(struct drm_crtc *crtc)
        drm_crtc_cleanup(crtc);
 }
 
-static void tegra_crtc_reset(struct drm_crtc *crtc)
-{
-       struct tegra_dc_state *state;
-
-       if (crtc->state)
-               __drm_atomic_helper_crtc_destroy_state(crtc->state);
-
-       kfree(crtc->state);
-       crtc->state = NULL;
-
-       state = kzalloc(sizeof(*state), GFP_KERNEL);
-       if (state) {
-               crtc->state = &state->base;
-               crtc->state->crtc = crtc;
-       }
-
-       drm_crtc_vblank_reset(crtc);
-}
-
 static struct drm_crtc_state *
 tegra_crtc_atomic_duplicate_state(struct drm_crtc *crtc)
 {
@@ -1198,6 +1179,17 @@ static void tegra_crtc_atomic_destroy_state(struct 
drm_crtc *crtc,
        kfree(state);
 }
 
+static void tegra_crtc_reset(struct drm_crtc *crtc)
+{
+       struct tegra_dc_state *state = kzalloc(sizeof(*state), GFP_KERNEL);
+
+       if (crtc->state)
+               tegra_crtc_atomic_destroy_state(crtc, crtc->state);
+
+       __drm_atomic_helper_crtc_reset(crtc, &state->base);
+       drm_crtc_vblank_reset(crtc);
+}
+
 #define DEBUGFS_REG32(_name) { .name = #_name, .offset = _name }
 
 static const struct debugfs_reg32 tegra_dc_regs[] = {
-- 
2.20.1

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