drm/msm: Add .commit() callback to msm_kms functions

Called right before wait_for_commit_done() to perform kickoff for
active crtcs.

Changes in v3:
- None
Signed-off-by: Jeykumar Sankaran <jsanka@codeaurora.org>
[seanpaul split this out of the megapatch]
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>

drivers/gpu/drm/msm/msm_atomic.c

@@ -71,6 +71,11 @@ void msm_atomic_commit_tail(struct drm_atomic_state *state)
 
 	drm_atomic_helper_commit_modeset_enables(dev, state);
 
+	if (kms->funcs->commit) {
+		DRM_DEBUG_ATOMIC("triggering commit\n");
+		kms->funcs->commit(kms, state);
+	}
+
 	msm_atomic_wait_for_commit_done(dev, state);
 
 	kms->funcs->complete_commit(kms, state);

drivers/gpu/drm/msm/msm_kms.h

@@ -42,6 +42,7 @@ struct msm_kms_funcs {
 	void (*disable_vblank)(struct msm_kms *kms, struct drm_crtc *crtc);
 	/* modeset, bracketing atomic_commit(): */
 	void (*prepare_commit)(struct msm_kms *kms, struct drm_atomic_state *state);
+	void (*commit)(struct msm_kms *kms, struct drm_atomic_state *state);
 	void (*complete_commit)(struct msm_kms *kms, struct drm_atomic_state *state);
 	/* functions to wait for atomic commit completed on each CRTC */
 	void (*wait_for_crtc_commit_done)(struct msm_kms *kms,