disp: msm: dp: skip link training in simulation mode

Skip link training when in simulation mode considering that we
are not yet implementing tests specific to link training. This
change will reduce the time it takes to power on the panel in
simulation mode, and also reduce the likelihood of failures
caused by unresponsive host machines.

Change-Id: Ie215cafd545bb25b4a033ceae1f275c690e7433d
Signed-off-by: Tatenda Chipeperekwa <tatendac@codeaurora.org>

msm/dp/dp_ctrl.c

@@ -70,6 +70,7 @@ struct dp_ctrl_private {
 	bool mst_mode;
 	bool fec_mode;
 	bool dsc_mode;
+	bool sim_mode;
 
 	atomic_t aborted;
 
@@ -328,6 +329,12 @@ static int dp_ctrl_link_training_1(struct dp_ctrl_private *ctrl)
 	ctrl->aux->state &= ~DP_STATE_TRAIN_1_SUCCEEDED;
 	ctrl->aux->state |= DP_STATE_TRAIN_1_STARTED;
 
+	if (ctrl->sim_mode) {
+		DP_DEBUG("simulation enabled, skip clock recovery\n");
+		ret = 0;
+		goto skip_training;
+	}
+
 	dp_ctrl_state_ctrl(ctrl, 0);
 	/* Make sure to clear the current pattern before starting a new one */
 	wmb();
@@ -398,6 +405,7 @@ static int dp_ctrl_link_training_1(struct dp_ctrl_private *ctrl)
 		}
 	}
 
+skip_training:
 	ctrl->aux->state &= ~DP_STATE_TRAIN_1_STARTED;
 
 	if (ret)
@@ -451,6 +459,12 @@ static int dp_ctrl_link_training_2(struct dp_ctrl_private *ctrl)
 	ctrl->aux->state &= ~DP_STATE_TRAIN_2_SUCCEEDED;
 	ctrl->aux->state |= DP_STATE_TRAIN_2_STARTED;
 
+	if (ctrl->sim_mode) {
+		DP_DEBUG("simulation enabled, skip channel equalization\n");
+		ret = 0;
+		goto skip_training;
+	}
+
 	dp_ctrl_state_ctrl(ctrl, 0);
 	/* Make sure to clear the current pattern before starting a new one */
 	wmb();
@@ -505,6 +519,7 @@ static int dp_ctrl_link_training_2(struct dp_ctrl_private *ctrl)
 		ctrl->link->adjust_levels(ctrl->link, link_status);
 	}
 
+skip_training:
 	ctrl->aux->state &= ~DP_STATE_TRAIN_2_STARTED;
 
 	if (ret)
@@ -1397,6 +1412,18 @@ static void dp_ctrl_isr(struct dp_ctrl *dp_ctrl)
 		dp_ctrl_idle_patterns_sent(ctrl);
 }
 
+void dp_ctrl_set_sim_mode(struct dp_ctrl *dp_ctrl, bool en)
+{
+	struct dp_ctrl_private *ctrl;
+
+	if (!dp_ctrl)
+		return;
+
+	ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
+	ctrl->sim_mode = en;
+	DP_INFO("sim_mode=%d\n", ctrl->sim_mode);
+}
+
 struct dp_ctrl *dp_ctrl_get(struct dp_ctrl_in *in)
 {
 	int rc = 0;
@@ -1445,6 +1472,7 @@ struct dp_ctrl *dp_ctrl_get(struct dp_ctrl_in *in)
 	dp_ctrl->stream_off = dp_ctrl_stream_off;
 	dp_ctrl->stream_pre_off = dp_ctrl_stream_pre_off;
 	dp_ctrl->set_mst_channel_info = dp_ctrl_set_mst_channel_info;
+	dp_ctrl->set_sim_mode = dp_ctrl_set_sim_mode;
 
 	return dp_ctrl;
 error: