drm/msm/dpu: manage DPU resources if CTM is requested

Allow modeset to be triggered during CTM enable/disable.
In the modeset callbacks, DPU resources required for the
CTM feature are managed appropriately.
Signed-off-by: Kalyan Thota <quic_kalyant@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/522448/
Link: https://lore.kernel.org/r/1676286704-818-5-git-send-email-quic_kalyant@quicinc.comSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

drivers/gpu/drm/msm/msm_atomic.c

@@ -179,6 +179,24 @@ static unsigned get_crtc_mask(struct drm_atomic_state *state)
 	return mask;
 }
 
+int msm_atomic_check(struct drm_device *dev, struct drm_atomic_state *state)
+{
+	struct drm_crtc_state *old_crtc_state, *new_crtc_state;
+	struct drm_crtc *crtc;
+	int i;
+
+	for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state,
+				      new_crtc_state, i) {
+		if ((old_crtc_state->ctm && !new_crtc_state->ctm) ||
+		    (!old_crtc_state->ctm && new_crtc_state->ctm)) {
+			new_crtc_state->mode_changed = true;
+			state->allow_modeset = true;
+		}
+	}
+
+	return drm_atomic_helper_check(dev, state);
+}
+
 void msm_atomic_commit_tail(struct drm_atomic_state *state)
 {
 	struct drm_device *dev = state->dev;

drivers/gpu/drm/msm/msm_drv.c

@@ -55,7 +55,7 @@
 static const struct drm_mode_config_funcs mode_config_funcs = {
 	.fb_create = msm_framebuffer_create,
 	.output_poll_changed = drm_fb_helper_output_poll_changed,
-	.atomic_check = drm_atomic_helper_check,
+	.atomic_check = msm_atomic_check,
 	.atomic_commit = drm_atomic_helper_commit,
 };
 

drivers/gpu/drm/msm/msm_drv.h

@@ -261,6 +261,7 @@ int msm_atomic_init_pending_timer(struct msm_pending_timer *timer,
 		struct msm_kms *kms, int crtc_idx);
 void msm_atomic_destroy_pending_timer(struct msm_pending_timer *timer);
 void msm_atomic_commit_tail(struct drm_atomic_state *state);
+int msm_atomic_check(struct drm_device *dev, struct drm_atomic_state *state);
 struct drm_atomic_state *msm_atomic_state_alloc(struct drm_device *dev);
 void msm_atomic_state_clear(struct drm_atomic_state *state);
 void msm_atomic_state_free(struct drm_atomic_state *state);