drm/msm/dp: remove unused stubs

Refactoring DP code transformed several functions into empty stubs.
Remove them.
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/490100/
Link: https://lore.kernel.org/r/20220617232434.1139950-1-dmitry.baryshkov@linaro.orgSigned-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/dp/dp_display.c

@@ -867,11 +867,6 @@ static int dp_display_set_mode(struct msm_dp *dp_display,
 	return 0;
 }
 
-static int dp_display_prepare(struct msm_dp *dp_display)
-{
-	return 0;
-}
-
 static int dp_display_enable(struct dp_display_private *dp, u32 data)
 {
 	int rc = 0;
@@ -948,11 +943,6 @@ static int dp_display_disable(struct dp_display_private *dp, u32 data)
 	return 0;
 }
 
-static int dp_display_unprepare(struct msm_dp *dp_display)
-{
-	return 0;
-}
-
 int dp_display_set_plugged_cb(struct msm_dp *dp_display,
 		hdmi_codec_plugged_cb fn, struct device *codec_dev)
 {
@@ -1468,21 +1458,9 @@ static int dp_pm_suspend(struct device *dev)
 	return 0;
 }
 
-static int dp_pm_prepare(struct device *dev)
-{
-	return 0;
-}
-
-static void dp_pm_complete(struct device *dev)
-{
-
-}
-
 static const struct dev_pm_ops dp_pm_ops = {
 	.suspend = dp_pm_suspend,
 	.resume =  dp_pm_resume,
-	.prepare = dp_pm_prepare,
-	.complete = dp_pm_complete,
 };
 
 static struct platform_driver dp_display_driver = {
@@ -1694,13 +1672,6 @@ void dp_bridge_enable(struct drm_bridge *drm_bridge)
 		return;
 	}
 
-	rc = dp_display_prepare(dp);
-	if (rc) {
-		DRM_ERROR("DP display prepare failed, rc=%d\n", rc);
-		mutex_unlock(&dp_display->event_mutex);
-		return;
-	}
-
 	state =  dp_display->hpd_state;
 
 	if (state == ST_DISPLAY_OFF) {
@@ -1714,7 +1685,6 @@ void dp_bridge_enable(struct drm_bridge *drm_bridge)
 	if (rc) {
 		DRM_ERROR("DP display post enable failed, rc=%d\n", rc);
 		dp_display_disable(dp_display, 0);
-		dp_display_unprepare(dp);
 	}
 
 	/* completed connection */
@@ -1739,7 +1709,6 @@ void dp_bridge_post_disable(struct drm_bridge *drm_bridge)
 {
 	struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
 	struct msm_dp *dp = dp_bridge->dp_display;
-	int rc = 0;
 	u32 state;
 	struct dp_display_private *dp_display;
 
@@ -1758,10 +1727,6 @@ void dp_bridge_post_disable(struct drm_bridge *drm_bridge)
 
 	dp_display_disable(dp_display, 0);
 
-	rc = dp_display_unprepare(dp);
-	if (rc)
-		DRM_ERROR("DP display unprepare failed, rc=%d\n", rc);
-
 	state =  dp_display->hpd_state;
 	if (state == ST_DISCONNECT_PENDING) {
 		/* completed disconnection */