msm: mdss: add MDSS_EVENT_LINK READY

At split display case, DSI panel initialization dcs
commands need to be sent to panel when both dsi links
are in LP-11 state. Add MDSS_EVENT_LINK_READY to have
both dsi controller's phy/pll initialized which brings
link to LP-11 state first so that panel initialization
dcs commands be received by panel successfully to bring
panel to display_on state.

Change-Id: I4b33fafd2673be1f068819bee25fc1a335eb0fe8
Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>

drivers/video/fbdev/msm/mdss_dsi.c

@@ -1193,15 +1193,17 @@ static int mdss_dsi_event_handler(struct mdss_panel_data *pdata,
 	}
 	ctrl_pdata = container_of(pdata, struct mdss_dsi_ctrl_pdata,
 				panel_data);
-	pr_debug("%s+:event=%d\n", __func__, event);
+	pr_debug("%s+: ctrl=%d event=%d\n", __func__, ctrl_pdata->ndx, event);
 
 	MDSS_XLOG(event, arg, ctrl_pdata->ndx, 0x3333);
 
 	switch (event) {
-	case MDSS_EVENT_UNBLANK:
+	case MDSS_EVENT_LINK_READY:
 		rc = mdss_dsi_on(pdata);
 		mdss_dsi_op_mode_config(pdata->panel_info.mipi.mode,
 							pdata);
+		break;
+	case MDSS_EVENT_UNBLANK:
 		if (ctrl_pdata->on_cmds.link_state == DSI_LP_MODE)
 			rc = mdss_dsi_unblank(pdata);
 		break;

drivers/video/fbdev/msm/mdss_mdp_intf_cmd.c

@@ -734,6 +734,9 @@ int mdss_mdp_cmd_kickoff(struct mdss_mdp_ctl *ctl, void *arg)
 	}
 
 	if (__mdss_mdp_cmd_panel_power_off(ctx)) {
+		rc = mdss_mdp_ctl_intf_event(ctl, MDSS_EVENT_LINK_READY, NULL);
+		WARN(rc, "intf %d link ready error (%d)\n", ctl->intf_num, rc);
+
 		rc = mdss_mdp_ctl_intf_event(ctl, MDSS_EVENT_UNBLANK, NULL);
 		WARN(rc, "intf %d unblank error (%d)\n", ctl->intf_num, rc);
 

drivers/video/fbdev/msm/mdss_mdp_intf_video.c

@@ -926,15 +926,18 @@ static int mdss_mdp_video_display(struct mdss_mdp_ctl *ctl, void *arg)
 	MDSS_XLOG(ctl->num, ctl->underrun_cnt);
 
 	if (!ctx->timegen_en) {
-		rc = mdss_mdp_ctl_intf_event(ctl, MDSS_EVENT_UNBLANK, NULL);
+		rc = mdss_mdp_ctl_intf_event(ctl, MDSS_EVENT_LINK_READY, NULL);
 		if (rc) {
-			pr_warn("intf #%d unblank error (%d)\n",
+			pr_warn("intf #%d link ready error (%d)\n",
 					ctl->intf_num, rc);
 			video_vsync_irq_disable(ctl);
 			ctx->wait_pending = 0;
 			return rc;
 		}
 
+		rc = mdss_mdp_ctl_intf_event(ctl, MDSS_EVENT_UNBLANK, NULL);
+		WARN(rc, "intf %d unblank error (%d)\n", ctl->intf_num, rc);
+
 		pr_debug("enabling timing gen for intf=%d\n", ctl->intf_num);
 
 		if (pdata->panel_info.cont_splash_enabled &&

drivers/video/fbdev/msm/mdss_panel.h

@@ -137,6 +137,7 @@ struct mdss_intf_recovery {
  * enum mdss_intf_events - Different events generated by MDP core
  *
  * @MDSS_EVENT_RESET:		MDP control path is being (re)initialized.
+ * @MDSS_EVENT_LINK_READY	Interface data path inited to ready state.
  * @MDSS_EVENT_UNBLANK:		Sent before first frame update from MDP is
  *				sent to panel.
  * @MDSS_EVENT_PANEL_ON:	After first frame update from MDP.
@@ -182,6 +183,7 @@ struct mdss_intf_recovery {
  */
 enum mdss_intf_events {
 	MDSS_EVENT_RESET = 1,
+	MDSS_EVENT_LINK_READY,
 	MDSS_EVENT_UNBLANK,
 	MDSS_EVENT_PANEL_ON,
 	MDSS_EVENT_BLANK,