msm: mdss: hdmi: refactor event handler

HDMI driver handles many MDP events. Currently all the events
are handled in one function. Create different functions for
each event for a cleaner approach.

Change-Id: Ib48c02b2b89f7fdb347afd3a02d8b6b7c1c03e85
Signed-off-by: Ajay Singh Parmar <aparmar@codeaurora.org>

3 files changed, 258 insertions, 181 deletions

diff --git a/drivers/video/fbdev/msm/mdss_hdmi_tx.c b/drivers/video/fbdev/msm/mdss_hdmi_tx.c
index 6df5c0d94e1f..4f266fffadfb 100644
--- a/drivers/video/fbdev/msm/mdss_hdmi_tx.c
+++ b/drivers/video/fbdev/msm/mdss_hdmi_tx.c
@@ -468,15 +468,14 @@ static inline bool hdmi_tx_is_cec_wakeup_en(struct hdmi_tx_ctrl *hdmi_ctrl)
 	return hdmi_cec_is_wakeup_en(fd);
 }
 
-static inline void hdmi_tx_cec_device_suspend(struct hdmi_tx_ctrl *hdmi_ctrl,
-		bool suspend)
+static inline void hdmi_tx_cec_device_suspend(struct hdmi_tx_ctrl *hdmi_ctrl)
 {
 	void *fd = hdmi_tx_get_fd(HDMI_TX_FEAT_CEC_HW);
 
 	if (!hdmi_ctrl || !fd)
 		return;
 
-	hdmi_cec_device_suspend(fd, suspend);
+	hdmi_cec_device_suspend(fd, hdmi_ctrl->panel_suspend);
 }
 
 
@@ -3698,17 +3697,18 @@ static inline void hdmi_tx_audio_off(struct hdmi_tx_ctrl *hdmi_ctrl)
 		sizeof(struct msm_ext_disp_audio_setup_params));
 }
 
-static int hdmi_tx_power_off(struct mdss_panel_data *panel_data)
+static int hdmi_tx_power_off(struct hdmi_tx_ctrl *hdmi_ctrl)
 {
 	struct dss_io_data *io = NULL;
-	struct hdmi_tx_ctrl *hdmi_ctrl =
-		hdmi_tx_get_drvdata_from_panel_data(panel_data);
+	struct mdss_panel_data *panel_data;
 
 	if (!hdmi_ctrl) {
 		DEV_ERR("%s: invalid input\n", __func__);
 		return -EINVAL;
 	}
 
+	panel_data = &hdmi_ctrl->panel_data;
+
 	io = &hdmi_ctrl->pdata.io[HDMI_TX_CORE_IO];
 	if (!io->base) {
 		DEV_ERR("%s: Core io is not initialized\n", __func__);
@@ -3744,14 +3744,13 @@ end:
 	return 0;
 } /* hdmi_tx_power_off */
 
-static int hdmi_tx_power_on(struct mdss_panel_data *panel_data)
+static int hdmi_tx_power_on(struct hdmi_tx_ctrl *hdmi_ctrl)
 {
 	int rc = 0;
 	int res_changed = RESOLUTION_UNCHANGED;
 	struct dss_io_data *io = NULL;
 	struct mdss_panel_info *panel_info = NULL;
-	struct hdmi_tx_ctrl *hdmi_ctrl =
-		hdmi_tx_get_drvdata_from_panel_data(panel_data);
+	struct mdss_panel_data *panel_data;
 
 	if (!hdmi_ctrl) {
 		DEV_ERR("%s: invalid input\n", __func__);
@@ -3770,6 +3769,8 @@ static int hdmi_tx_power_on(struct mdss_panel_data *panel_data)
 		goto end;
 	}
 
+	panel_data = &hdmi_ctrl->panel_data;
+
 	rc = hdmi_tx_check_clk_state(hdmi_ctrl, HDMI_TX_HPD_PM);
 	if (rc)
 		goto end;
@@ -4407,219 +4408,258 @@ static void hdmi_tx_fps_work(struct work_struct *work)
 	hdmi_tx_update_fps(hdmi_ctrl);
 }
 
-static int hdmi_tx_panel_event_handler(struct mdss_panel_data *panel_data,
-	int event, void *arg)
+static int hdmi_tx_evt_handle_register(struct hdmi_tx_ctrl *hdmi_ctrl)
 {
-	int rc = 0, new_vic = -1;
-	struct hdmi_tx_ctrl *hdmi_ctrl =
-		hdmi_tx_get_drvdata_from_panel_data(panel_data);
+	int rc = 0;
 
-	if (!hdmi_ctrl) {
-		DEV_ERR("%s: invalid input\n", __func__);
-		return -EINVAL;
+	rc = hdmi_tx_sysfs_create(hdmi_ctrl, hdmi_ctrl->evt_arg);
+	if (rc) {
+		DEV_ERR("%s: hdmi_tx_sysfs_create failed.rc=%d\n",
+			__func__, rc);
+		goto sysfs_err;
 	}
-
-	/* UPDATE FPS is called from atomic context */
-	if (event == MDSS_EVENT_PANEL_UPDATE_FPS) {
-		hdmi_ctrl->dynamic_fps = (u32) (unsigned long)arg;
-		queue_work(hdmi_ctrl->workq, &hdmi_ctrl->fps_work);
-		return rc;
+	rc = hdmi_tx_init_features(hdmi_ctrl, hdmi_ctrl->evt_arg);
+	if (rc) {
+		DEV_ERR("%s: init_features failed.rc=%d\n", __func__, rc);
+		goto init_err;
 	}
 
-	mutex_lock(&hdmi_ctrl->tx_lock);
-
-	DEV_DBG("%s: event = %s suspend=%d, hpd_feature=%d\n", __func__,
-		hdmi_tx_get_event_name(event), hdmi_ctrl->panel_suspend,
-		hdmi_ctrl->hpd_feature_on);
+	rc = hdmi_tx_init_switch_dev(hdmi_ctrl);
+	if (rc) {
+		DEV_ERR("%s: init switch dev failed.rc=%d\n", __func__, rc);
+		goto switch_err;
+	}
 
-	switch (event) {
-	case MDSS_EVENT_FB_REGISTERED:
-		rc = hdmi_tx_sysfs_create(hdmi_ctrl, arg);
-		if (rc) {
-			DEV_ERR("%s: hdmi_tx_sysfs_create failed.rc=%d\n",
-					__func__, rc);
-			goto end;
-		}
-		rc = hdmi_tx_init_features(hdmi_ctrl, arg);
+	if (hdmi_ctrl->pdata.primary || !hdmi_ctrl->pdata.pluggable) {
+		reinit_completion(&hdmi_ctrl->hpd_int_done);
+		rc = hdmi_tx_sysfs_enable_hpd(hdmi_ctrl, true);
 		if (rc) {
-			DEV_ERR("%s: init_features failed.rc=%d\n",
-					__func__, rc);
-			hdmi_tx_sysfs_remove(hdmi_ctrl);
-			goto end;
+			DEV_ERR("%s: hpd_enable failed. rc=%d\n", __func__, rc);
+			goto primary_err;
+		} else {
+			hdmi_ctrl->hpd_feature_on = true;
 		}
+	}
 
-		rc = hdmi_tx_init_switch_dev(hdmi_ctrl);
-		if (rc) {
-			DEV_ERR("%s: init switch dev failed.rc=%d\n",
-				__func__, rc);
-			hdmi_tx_sysfs_remove(hdmi_ctrl);
-			goto end;
-		}
+	return 0;
 
-		if (hdmi_ctrl->pdata.primary || !hdmi_ctrl->pdata.pluggable) {
-			reinit_completion(&hdmi_ctrl->hpd_int_done);
-			rc = hdmi_tx_sysfs_enable_hpd(hdmi_ctrl, true);
-			if (rc) {
-				DEV_ERR("%s: hpd_enable failed. rc=%d\n",
-					__func__, rc);
-				hdmi_tx_sysfs_remove(hdmi_ctrl);
-				goto end;
-			} else {
-				hdmi_ctrl->hpd_feature_on = true;
-			}
-		}
+primary_err:
+	switch_dev_unregister(&hdmi_ctrl->sdev);
+switch_err:
+	hdmi_tx_deinit_features(hdmi_ctrl, HDMI_TX_FEAT_MAX);
+init_err:
+	hdmi_tx_sysfs_remove(hdmi_ctrl);
+sysfs_err:
+	return rc;
+}
 
-		break;
+static int hdmi_tx_evt_handle_check_param(struct hdmi_tx_ctrl *hdmi_ctrl)
+{
+	int new_vic = -1;
+	int rc = 0;
 
-	case MDSS_EVENT_CHECK_PARAMS:
-		new_vic = hdmi_tx_get_vic_from_panel_info(hdmi_ctrl,
-			(struct mdss_panel_info *)arg);
-		if ((new_vic < 0) || (new_vic > HDMI_VFRMT_MAX)) {
-			DEV_ERR("%s: invalid or not supported vic\n", __func__);
-			goto end;
-		}
+	new_vic = hdmi_tx_get_vic_from_panel_info(hdmi_ctrl,
+			hdmi_ctrl->evt_arg);
+	if ((new_vic < 0) || (new_vic > HDMI_VFRMT_MAX)) {
+		DEV_ERR("%s: invalid or not supported vic\n", __func__);
+		goto end;
+	}
 
-		/*
-		 * return value of 1 lets mdss know that panel
-		 * needs a reconfig due to new resolution and
-		 * it will issue close and open subsequently.
-		 */
-		if (new_vic != hdmi_ctrl->vid_cfg.vic)
-			rc = 1;
-		else
-			DEV_DBG("%s: no res change.\n", __func__);
-		break;
+	/*
+	 * return value of 1 lets mdss know that panel
+	 * needs a reconfig due to new resolution and
+	 * it will issue close and open subsequently.
+	 */
+	if (new_vic != hdmi_ctrl->vid_cfg.vic) {
+		rc = 1;
+		DEV_DBG("%s: res change %d ==> %d\n", __func__,
+			hdmi_ctrl->vid_cfg.vic, new_vic);
+	}
+end:
+	return rc;
+}
 
-	case MDSS_EVENT_RESUME:
-		hdmi_ctrl->panel_suspend = false;
-		hdmi_tx_cec_device_suspend(hdmi_ctrl, hdmi_ctrl->panel_suspend);
+static int hdmi_tx_evt_handle_resume(struct hdmi_tx_ctrl *hdmi_ctrl)
+{
+	int rc = 0;
 
-		if (!hdmi_ctrl->hpd_feature_on)
-			goto end;
+	hdmi_ctrl->panel_suspend = false;
+	hdmi_tx_cec_device_suspend(hdmi_ctrl);
 
-		rc = hdmi_tx_hpd_on(hdmi_ctrl);
-		if (rc) {
-			DEV_ERR("%s: hpd_on failed. rc=%d\n", __func__, rc);
-			goto end;
-		}
+	if (!hdmi_ctrl->hpd_feature_on)
+		goto end;
 
-		if (hdmi_ctrl->sdev.state &&
-			!hdmi_tx_hw_is_cable_connected(hdmi_ctrl)) {
-			u32 timeout;
-
-			reinit_completion(&hdmi_ctrl->hpd_int_done);
-			timeout = wait_for_completion_timeout(
-				&hdmi_ctrl->hpd_int_done, HZ/10);
-			if (!timeout && !hdmi_ctrl->hpd_state) {
-				DEV_DBG("%s: cable removed during suspend\n",
-					__func__);
-				hdmi_tx_set_audio_switch_node(hdmi_ctrl, 0);
-				hdmi_tx_wait_for_audio_engine(hdmi_ctrl);
-				hdmi_tx_send_cable_notification(hdmi_ctrl, 0);
-			}
-		}
+	rc = hdmi_tx_hpd_on(hdmi_ctrl);
+	if (rc) {
+		DEV_ERR("%s: hpd_on failed. rc=%d\n", __func__, rc);
+		goto end;
+	}
 
-		break;
+	if (hdmi_ctrl->sdev.state &&
+		!hdmi_tx_hw_is_cable_connected(hdmi_ctrl)) {
+		u32 timeout;
 
-	case MDSS_EVENT_RESET:
-		if (!hdmi_ctrl->pdata.cont_splash_enabled &&
-				hdmi_ctrl->hpd_initialized) {
-			hdmi_tx_set_mode(hdmi_ctrl, false);
-			hdmi_tx_phy_reset(hdmi_ctrl);
-			hdmi_tx_set_mode(hdmi_ctrl, true);
+		reinit_completion(&hdmi_ctrl->hpd_int_done);
+		timeout = wait_for_completion_timeout(
+			&hdmi_ctrl->hpd_int_done, HZ/10);
+		if (!timeout && !hdmi_ctrl->hpd_state) {
+			DEV_DBG("%s: cable removed during suspend\n", __func__);
+			hdmi_tx_set_audio_switch_node(hdmi_ctrl, 0);
+			hdmi_tx_wait_for_audio_engine(hdmi_ctrl);
+			hdmi_tx_send_cable_notification(hdmi_ctrl, 0);
 		}
+	}
+end:
+	return rc;
+}
 
-		break;
+static int hdmi_tx_evt_handle_reset(struct hdmi_tx_ctrl *hdmi_ctrl)
+{
+	if (!hdmi_ctrl->panel_data.panel_info.cont_splash_enabled &&
+	    hdmi_ctrl->hpd_initialized) {
+		hdmi_tx_set_mode(hdmi_ctrl, false);
+		hdmi_tx_phy_reset(hdmi_ctrl);
+		hdmi_tx_set_mode(hdmi_ctrl, true);
+	}
 
-	case MDSS_EVENT_UNBLANK:
-		rc = hdmi_tx_enable_power(hdmi_ctrl, HDMI_TX_DDC_PM, true);
-		if (rc) {
-			DEV_ERR("%s: ddc power on failed. rc=%d\n",
-				__func__, rc);
-		} else {
-			rc = hdmi_tx_power_on(panel_data);
-			if (rc)
-				DEV_ERR("%s: hdmi_tx_power_on failed. rc=%d\n",
-					__func__, rc);
-		}
-		break;
+	return 0;
+}
 
-	case MDSS_EVENT_PANEL_ON:
-		if (!hdmi_ctrl->sim_mode) {
-			hdmi_tx_update_hdcp_info(hdmi_ctrl);
+static int hdmi_tx_evt_handle_unblank(struct hdmi_tx_ctrl *hdmi_ctrl)
+{
+	int rc;
 
-			rc = hdmi_tx_start_hdcp(hdmi_ctrl);
-			if (rc)
-				DEV_ERR("%s: hdcp start failed rc=%d\n",
-					__func__, rc);
-		}
+	rc = hdmi_tx_enable_power(hdmi_ctrl, HDMI_TX_DDC_PM, true);
+	if (rc) {
+		DEV_ERR("%s: ddc power on failed. rc=%d\n", __func__, rc);
+		goto end;
+	}
 
-		hdmi_ctrl->timing_gen_on = true;
+	rc = hdmi_tx_power_on(hdmi_ctrl);
+	if (rc)
+		DEV_ERR("%s: hdmi_tx_power_on failed. rc=%d\n", __func__, rc);
+end:
+	return rc;
+}
 
-		if (hdmi_ctrl->panel_suspend) {
-			DEV_DBG("%s: panel suspend has triggered\n", __func__);
+static int hdmi_tx_evt_handle_panel_on(struct hdmi_tx_ctrl *hdmi_ctrl)
+{
+	int rc = 0;
 
-			hdmi_tx_set_audio_switch_node(hdmi_ctrl, 0);
-			hdmi_tx_wait_for_audio_engine(hdmi_ctrl);
-			hdmi_tx_send_cable_notification(hdmi_ctrl, 0);
-		}
-		break;
+	if (!hdmi_ctrl->sim_mode) {
+		hdmi_tx_update_hdcp_info(hdmi_ctrl);
 
-	case MDSS_EVENT_SUSPEND:
-		if (!hdmi_ctrl->hpd_feature_on)
-			goto end;
+		rc = hdmi_tx_start_hdcp(hdmi_ctrl);
+		if (rc)
+			DEV_ERR("%s: hdcp start failed rc=%d\n", __func__, rc);
+	}
 
-		if (!hdmi_ctrl->hpd_state && !hdmi_ctrl->panel_power_on)
-			hdmi_tx_hpd_off(hdmi_ctrl);
+	hdmi_ctrl->timing_gen_on = true;
 
-		hdmi_ctrl->panel_suspend = true;
-		hdmi_tx_cec_device_suspend(hdmi_ctrl, hdmi_ctrl->panel_suspend);
-		break;
+	if (hdmi_ctrl->panel_suspend) {
+		DEV_DBG("%s: panel suspend has triggered\n", __func__);
 
-	case MDSS_EVENT_BLANK:
-		if (hdmi_tx_is_hdcp_enabled(hdmi_ctrl))
-			hdmi_tx_hdcp_off(hdmi_ctrl);
+		hdmi_tx_set_audio_switch_node(hdmi_ctrl, 0);
+		hdmi_tx_wait_for_audio_engine(hdmi_ctrl);
+		hdmi_tx_send_cable_notification(hdmi_ctrl, 0);
+	}
 
-		break;
+	return rc;
+}
 
-	case MDSS_EVENT_PANEL_OFF:
-		rc = hdmi_tx_enable_power(hdmi_ctrl, HDMI_TX_DDC_PM, false);
-		if (rc) {
-			DEV_ERR("%s: Failed to disable ddc power\n", __func__);
-			return rc;
-		}
+static int hdmi_tx_evt_handle_suspend(struct hdmi_tx_ctrl *hdmi_ctrl)
+{
+	if (!hdmi_ctrl->hpd_feature_on)
+		goto end;
 
-		if (hdmi_ctrl->panel_power_on) {
-			hdmi_tx_config_avmute(hdmi_ctrl, 1);
-			rc = hdmi_tx_power_off(panel_data);
-			if (rc)
-				DEV_ERR("%s: hdmi_tx_power_off failed.rc=%d\n",
-					__func__, rc);
-		} else {
-			DEV_DBG("%s: hdmi is already powered off\n", __func__);
-		}
+	if (!hdmi_ctrl->hpd_state && !hdmi_ctrl->panel_power_on)
+		hdmi_tx_hpd_off(hdmi_ctrl);
 
-		hdmi_ctrl->timing_gen_on = false;
-		break;
+	hdmi_ctrl->panel_suspend = true;
+	hdmi_tx_cec_device_suspend(hdmi_ctrl);
+end:
+	return 0;
+}
 
-	case MDSS_EVENT_CLOSE:
-		if (panel_data->panel_info.cont_splash_enabled) {
-			hdmi_tx_power_off(panel_data);
-			panel_data->panel_info.cont_splash_enabled = false;
+static int hdmi_tx_evt_handle_blank(struct hdmi_tx_ctrl *hdmi_ctrl)
+{
+	if (hdmi_tx_is_hdcp_enabled(hdmi_ctrl))
+		hdmi_tx_hdcp_off(hdmi_ctrl);
 
-			goto end;
-		}
+	return 0;
+}
 
-		if (hdmi_ctrl->hpd_feature_on && hdmi_ctrl->hpd_initialized &&
-			!hdmi_ctrl->hpd_state)
-			hdmi_tx_hpd_polarity_setup(hdmi_ctrl,
-				HPD_CONNECT_POLARITY);
-		break;
+static int hdmi_tx_evt_handle_panel_off(struct hdmi_tx_ctrl *hdmi_ctrl)
+{
+	int rc;
+
+	rc = hdmi_tx_enable_power(hdmi_ctrl, HDMI_TX_DDC_PM, false);
+	if (rc) {
+		DEV_ERR("%s: Failed to disable ddc power\n", __func__);
+		goto end;
+	}
+
+	if (hdmi_ctrl->panel_power_on) {
+		hdmi_tx_config_avmute(hdmi_ctrl, 1);
+		rc = hdmi_tx_power_off(hdmi_ctrl);
+		if (rc)
+			DEV_ERR("%s: hdmi_tx_power_off failed.rc=%d\n",
+				__func__, rc);
+	} else {
+		DEV_DBG("%s: hdmi_ctrl is already powered off\n", __func__);
 	}
+
+	hdmi_ctrl->timing_gen_on = false;
 end:
+	return rc;
+}
+
+static int hdmi_tx_evt_handle_close(struct hdmi_tx_ctrl *hdmi_ctrl)
+{
+	if (hdmi_ctrl->hpd_feature_on && hdmi_ctrl->hpd_initialized &&
+	    !hdmi_ctrl->hpd_state)
+		hdmi_tx_hpd_polarity_setup(hdmi_ctrl, HPD_CONNECT_POLARITY);
+
+	return 0;
+}
+
+static int hdmi_tx_event_handler(struct mdss_panel_data *panel_data,
+	int event, void *arg)
+{
+	int rc = 0;
+	hdmi_tx_evt_handler handler;
+	struct hdmi_tx_ctrl *hdmi_ctrl =
+		hdmi_tx_get_drvdata_from_panel_data(panel_data);
+
+	if (!hdmi_ctrl) {
+		DEV_ERR("%s: invalid input\n", __func__);
+		rc = -EINVAL;
+		goto end;
+	}
+
+	/* UPDATE FPS is called from atomic context */
+	if (event == MDSS_EVENT_PANEL_UPDATE_FPS) {
+		hdmi_ctrl->dynamic_fps = (u32) (unsigned long)arg;
+		queue_work(hdmi_ctrl->workq, &hdmi_ctrl->fps_work);
+		return rc;
+	}
+
+	mutex_lock(&hdmi_ctrl->tx_lock);
+
+	hdmi_ctrl->evt_arg = arg;
+
+	DEV_DBG("%s: event = %s suspend=%d, hpd_feature=%d\n", __func__,
+		hdmi_tx_get_event_name(event), hdmi_ctrl->panel_suspend,
+		hdmi_ctrl->hpd_feature_on);
+
+	handler = hdmi_ctrl->evt_handler[event];
+	if (handler)
+		rc = handler(hdmi_ctrl);
+
 	mutex_unlock(&hdmi_ctrl->tx_lock);
+end:
 	return rc;
-} /* hdmi_tx_panel_event_handler */
+}
 
 static int hdmi_tx_register_panel(struct hdmi_tx_ctrl *hdmi_ctrl)
 {
@@ -4630,7 +4670,7 @@ static int hdmi_tx_register_panel(struct hdmi_tx_ctrl *hdmi_ctrl)
 		return -EINVAL;
 	}
 
-	hdmi_ctrl->panel_data.event_handler = hdmi_tx_panel_event_handler;
+	hdmi_ctrl->panel_data.event_handler = hdmi_tx_event_handler;
 
 	if (!hdmi_ctrl->pdata.primary)
 		hdmi_ctrl->vid_cfg.vic = DEFAULT_VIDEO_RESOLUTION;
@@ -5220,6 +5260,29 @@ error:
 	return rc;
 } /* hdmi_tx_get_dt_data */
 
+static int hdmi_tx_init_event_handler(struct hdmi_tx_ctrl *hdmi_ctrl)
+{
+	hdmi_tx_evt_handler *handler;
+
+	if (!hdmi_ctrl)
+		return -EINVAL;
+
+	handler = hdmi_ctrl->evt_handler;
+
+	handler[MDSS_EVENT_FB_REGISTERED] = hdmi_tx_evt_handle_register;
+	handler[MDSS_EVENT_CHECK_PARAMS]  = hdmi_tx_evt_handle_check_param;
+	handler[MDSS_EVENT_RESUME]        = hdmi_tx_evt_handle_resume;
+	handler[MDSS_EVENT_RESET]         = hdmi_tx_evt_handle_reset;
+	handler[MDSS_EVENT_UNBLANK]       = hdmi_tx_evt_handle_unblank;
+	handler[MDSS_EVENT_PANEL_ON]      = hdmi_tx_evt_handle_panel_on;
+	handler[MDSS_EVENT_SUSPEND]       = hdmi_tx_evt_handle_suspend;
+	handler[MDSS_EVENT_BLANK]         = hdmi_tx_evt_handle_blank;
+	handler[MDSS_EVENT_PANEL_OFF]     = hdmi_tx_evt_handle_panel_off;
+	handler[MDSS_EVENT_CLOSE]         = hdmi_tx_evt_handle_close;
+
+	return 0;
+}
+
 static int hdmi_tx_probe(struct platform_device *pdev)
 {
 	int rc = 0, i;
@@ -5301,6 +5364,13 @@ static int hdmi_tx_probe(struct platform_device *pdev)
 		goto failed_dev_init;
 	}
 
+	rc = hdmi_tx_init_event_handler(hdmi_ctrl);
+	if (rc) {
+		DEV_ERR("%s: FAILED: hdmi_tx_init_event_handler. rc=%d\n",
+			__func__, rc);
+		goto failed_dev_init;
+	}
+
 	rc = hdmi_tx_register_panel(hdmi_ctrl);
 	if (rc) {
 		DEV_ERR("%s: FAILED: register_panel. rc=%d\n", __func__, rc);
diff --git a/drivers/video/fbdev/msm/mdss_hdmi_tx.h b/drivers/video/fbdev/msm/mdss_hdmi_tx.h
index ff7b9f72ae6f..f348bfba6929 100644
--- a/drivers/video/fbdev/msm/mdss_hdmi_tx.h
+++ b/drivers/video/fbdev/msm/mdss_hdmi_tx.h
@@ -121,6 +121,9 @@ struct hdmi_video_config {
 	struct hdmi_avi_infoframe_config avi_iframe;
 };
 
+struct hdmi_tx_ctrl;
+typedef int (*hdmi_tx_evt_handler) (struct hdmi_tx_ctrl *);
+
 struct hdmi_tx_ctrl {
 	struct platform_device *pdev;
 	u32 hdmi_tx_ver;
@@ -200,6 +203,9 @@ struct hdmi_tx_ctrl {
 
 	char disp_switch_name[MAX_SWITCH_NAME_SIZE];
 	bool power_data_enable[HDMI_TX_MAX_PM];
+
+	hdmi_tx_evt_handler evt_handler[MDSS_EVENT_MAX];
+	void *evt_arg;
 };
 
 #endif /* __MDSS_HDMI_TX_H__ */
diff --git a/drivers/video/fbdev/msm/mdss_panel.h b/drivers/video/fbdev/msm/mdss_panel.h
index 7528f642149b..d3f836032bb6 100644
--- a/drivers/video/fbdev/msm/mdss_panel.h
+++ b/drivers/video/fbdev/msm/mdss_panel.h
@@ -262,6 +262,7 @@ enum mdss_intf_events {
 	MDSS_EVENT_DSI_RECONFIG_CMD,
 	MDSS_EVENT_DSI_RESET_WRITE_PTR,
 	MDSS_EVENT_PANEL_TIMING_SWITCH,
+	MDSS_EVENT_MAX,
 };
 
 struct lcd_panel_info {