drm/msm/dpu: Require modeset if clone mode status changes

If the clone mode enabled status is changing, a modeset needs to happen
so that the resources can be reassigned

Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Jessica Zhang <quic_jesszhan@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/637483/
Link: https://lore.kernel.org/r/20250214-concurrent-wb-v6-5-a44c293cf422@quicinc.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c

@@ -1351,19 +1351,26 @@ static int dpu_crtc_assign_resources(struct drm_crtc *crtc,
  *
  * Check if the changes in the object properties demand full mode set.
  */
-int dpu_crtc_check_mode_changed(struct drm_crtc_state *crtc_state)
+int dpu_crtc_check_mode_changed(struct drm_crtc_state *old_crtc_state,
+				struct drm_crtc_state *new_crtc_state)
 {
 	struct drm_encoder *drm_enc;
-	struct drm_crtc *crtc = crtc_state->crtc;
+	struct drm_crtc *crtc = new_crtc_state->crtc;
+	bool clone_mode_enabled = drm_crtc_in_clone_mode(old_crtc_state);
+	bool clone_mode_requested = drm_crtc_in_clone_mode(new_crtc_state);
 
 	DRM_DEBUG_ATOMIC("%d\n", crtc->base.id);
 
 	/* there might be cases where encoder needs a modeset too */
-	drm_for_each_encoder_mask(drm_enc, crtc->dev, crtc_state->encoder_mask) {
-		if (dpu_encoder_needs_modeset(drm_enc, crtc_state->state))
-			crtc_state->mode_changed = true;
+	drm_for_each_encoder_mask(drm_enc, crtc->dev, new_crtc_state->encoder_mask) {
+		if (dpu_encoder_needs_modeset(drm_enc, new_crtc_state->state))
+			new_crtc_state->mode_changed = true;
 	}
 
+	if ((clone_mode_requested && !clone_mode_enabled) ||
+	    (!clone_mode_requested && clone_mode_enabled))
+		new_crtc_state->mode_changed = true;
+
 	return 0;
 }
 

drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h

@@ -239,7 +239,8 @@ static inline int dpu_crtc_frame_pending(struct drm_crtc *crtc)
 	return crtc ? atomic_read(&to_dpu_crtc(crtc)->frame_pending) : -EINVAL;
 }
 
-int dpu_crtc_check_mode_changed(struct drm_crtc_state *crtc_state);
+int dpu_crtc_check_mode_changed(struct drm_crtc_state *old_crtc_state,
+				struct drm_crtc_state *new_crtc_state);
 
 int dpu_crtc_vblank(struct drm_crtc *crtc, bool en);
 

drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c

@@ -449,11 +449,12 @@ static void dpu_kms_disable_commit(struct msm_kms *kms)
 static int dpu_kms_check_mode_changed(struct msm_kms *kms, struct drm_atomic_state *state)
 {
 	struct drm_crtc_state *new_crtc_state;
+	struct drm_crtc_state *old_crtc_state;
 	struct drm_crtc *crtc;
 	int i;
 
-	for_each_new_crtc_in_state(state, crtc, new_crtc_state, i)
-		dpu_crtc_check_mode_changed(new_crtc_state);
+	for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i)
+		dpu_crtc_check_mode_changed(old_crtc_state, new_crtc_state);
 
 	return 0;
 }