drm/mtk: Use __drm_atomic_helper_crtc_reset

Now also comes with the added benefit of doing a drm_crtc_vblank_off(),
which means vblank state isn't ill-defined and fail-y at driver load
before the first modeset on each crtc.

Acked-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Chun-Kuang Hu <chunkuang.hu@kernel.org>
Cc: Philipp Zabel <p.zabel@pengutronix.de>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-mediatek@lists.infradead.org
Link: https://patchwork.freedesktop.org/patch/msgid/20200612160056.2082681-4-daniel.vetter@ffwll.ch

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
index e56e47a..f6adc5b 100644 (file)
--- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
@@ -113,19 +113,15 @@ static void mtk_drm_crtc_reset(struct drm_crtc *crtc)
 {
        struct mtk_crtc_state *state;
 
-       if (crtc->state) {
+       if (crtc->state)
                __drm_atomic_helper_crtc_destroy_state(crtc->state);
 
-               state = to_mtk_crtc_state(crtc->state);
-               memset(state, 0, sizeof(*state));
-       } else {
-               state = kzalloc(sizeof(*state), GFP_KERNEL);
-               if (!state)
-                       return;
-               crtc->state = &state->base;
-       }
+       kfree(to_mtk_crtc_state(crtc->state));
+       crtc->state = NULL;
 
-       state->base.crtc = crtc;
+       state = kzalloc(sizeof(*state), GFP_KERNEL);
+       if (state)
+               __drm_atomic_helper_crtc_reset(crtc, &state->base);
 }
 
 static struct drm_crtc_state *mtk_drm_crtc_duplicate_state(struct drm_crtc *crtc)