drm/msm/dp: rename is_connected with link_ready

The is_connected flag is set to true after DP mainlink successfully
finishes link training to enter into ST_MAINLINK_READY state rather
than being set after the DP dongle is connected. Rename the
is_connected flag with link_ready flag to match the state of DP
driver's state machine.

Changes in v5:
-- reworded commit text according to review comments from change #4

Changes in v4:
-- reworded commit text
Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/570063/
Link: https://lore.kernel.org/r/1701472789-25951-3-git-send-email-quic_khsieh@quicinc.comSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

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

@@ -351,12 +351,11 @@ static void dp_display_send_hpd_event(struct msm_dp *dp_display)
 	drm_helper_hpd_irq_event(connector->dev);
 }
 
-
 static int dp_display_send_hpd_notification(struct dp_display_private *dp,
 					    bool hpd)
 {
-	if ((hpd && dp->dp_display.is_connected) ||
-			(!hpd && !dp->dp_display.is_connected)) {
+	if ((hpd && dp->dp_display.link_ready) ||
+			(!hpd && !dp->dp_display.link_ready)) {
 		drm_dbg_dp(dp->drm_dev, "HPD already %s\n",
 				(hpd ? "on" : "off"));
 		return 0;
@@ -370,7 +369,7 @@ static int dp_display_send_hpd_notification(struct dp_display_private *dp,
 						 dp->panel->dpcd, dp->panel->downstream_ports);
 	}
 
-	dp->dp_display.is_connected = hpd;
+	dp->dp_display.link_ready = hpd;
 
 	drm_dbg_dp(dp->drm_dev, "type=%d hpd=%d\n",
 			dp->dp_display.connector_type, hpd);
@@ -912,7 +911,7 @@ int dp_display_set_plugged_cb(struct msm_dp *dp_display,
 
 	dp_display->plugged_cb = fn;
 	dp_display->codec_dev = codec_dev;
-	plugged = dp_display->is_connected;
+	plugged = dp_display->link_ready;
 	dp_display_handle_plugged_change(dp_display, plugged);
 
 	return 0;
@@ -1343,16 +1342,16 @@ static int dp_pm_resume(struct device *dev)
 	 * also only signal audio when disconnected
 	 */
 	if (dp->link->sink_count) {
-		dp->dp_display.is_connected = true;
+		dp->dp_display.link_ready = true;
 	} else {
-		dp->dp_display.is_connected = false;
+		dp->dp_display.link_ready = false;
 		dp_display_handle_plugged_change(dp_display, false);
 	}
 
 	drm_dbg_dp(dp->drm_dev,
 		"After, type=%d sink=%d conn=%d core_init=%d phy_init=%d power=%d\n",
 		dp->dp_display.connector_type, dp->link->sink_count,
-		dp->dp_display.is_connected, dp->core_initialized,
+		dp->dp_display.link_ready, dp->core_initialized,
 		dp->phy_initialized, dp_display->power_on);
 
 	mutex_unlock(&dp->event_mutex);
@@ -1740,8 +1739,8 @@ void dp_bridge_hpd_notify(struct drm_bridge *bridge,
 		return;
 	}
 
-	if (!dp_display->is_connected && status == connector_status_connected)
+	if (!dp_display->link_ready && status == connector_status_connected)
 		dp_add_event(dp, EV_HPD_PLUG_INT, 0, 0);
-	else if (dp_display->is_connected && status == connector_status_disconnected)
+	else if (dp_display->link_ready && status == connector_status_disconnected)
 		dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0);
 }

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

@@ -17,7 +17,7 @@ struct msm_dp {
 	struct drm_bridge *bridge;
 	struct drm_connector *connector;
 	struct drm_bridge *next_bridge;
-	bool is_connected;
+	bool link_ready;
 	bool audio_enabled;
 	bool power_on;
 	unsigned int connector_type;

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

@@ -24,10 +24,10 @@ static enum drm_connector_status dp_bridge_detect(struct drm_bridge *bridge)
 
 	dp = to_dp_bridge(bridge)->dp_display;
 
-	drm_dbg_dp(dp->drm_dev, "is_connected = %s\n",
-		(dp->is_connected) ? "true" : "false");
+	drm_dbg_dp(dp->drm_dev, "link_ready = %s\n",
+		(dp->link_ready) ? "true" : "false");
 
-	return (dp->is_connected) ? connector_status_connected :
+	return (dp->link_ready) ? connector_status_connected :
 					connector_status_disconnected;
 }
 
@@ -40,8 +40,8 @@ static int dp_bridge_atomic_check(struct drm_bridge *bridge,
 
 	dp = to_dp_bridge(bridge)->dp_display;
 
-	drm_dbg_dp(dp->drm_dev, "is_connected = %s\n",
-		(dp->is_connected) ? "true" : "false");
+	drm_dbg_dp(dp->drm_dev, "link_ready = %s\n",
+		(dp->link_ready) ? "true" : "false");
 
 	/*
 	 * There is no protection in the DRM framework to check if the display
@@ -55,7 +55,7 @@ static int dp_bridge_atomic_check(struct drm_bridge *bridge,
 	 * After that this piece of code can be removed.
 	 */
 	if (bridge->ops & DRM_BRIDGE_OP_HPD)
-		return (dp->is_connected) ? 0 : -ENOTCONN;
+		return (dp->link_ready) ? 0 : -ENOTCONN;
 
 	return 0;
 }
@@ -78,7 +78,7 @@ static int dp_bridge_get_modes(struct drm_bridge *bridge, struct drm_connector *
 	dp = to_dp_bridge(bridge)->dp_display;
 
 	/* pluggable case assumes EDID is read when HPD */
-	if (dp->is_connected) {
+	if (dp->link_ready) {
 		rc = dp_display_get_modes(dp);
 		if (rc <= 0) {
 			DRM_ERROR("failed to get DP sink modes, rc=%d\n", rc);