drm/msm/dp: Use the connector passed to dp_debug_get()

The debugfs code is provided an array of a single drm_connector. Then to
access the connector, the list of all connectors of the DRM device is
traversed and all non-DisplayPort connectors are skipped, to find the
one and only DisplayPort connector.

But as we move to support multiple DisplayPort controllers this will now
find multiple connectors and has no way to distinguish them.

Pass the single connector to dp_debug_get() and use this in the debugfs
functions instead, both to simplify the code and the support the
multiple instances.

Reviewed-by: Abhinav Kumar <[e-mail]>
Reviewed-by: Stephen Boyd <[e-mail]>
Signed-off-by: Bjorn Andersson <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Rob Clark <[e-mail]>

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

···
 	struct dp_usbpd *usbpd;
 	struct dp_link *link;
 	struct dp_panel *panel;
-	struct drm_connector **connector;
+	struct drm_connector *connector;
 	struct device *dev;
 	struct drm_device *drm_dev;
 
···
 
 static int dp_test_data_show(struct seq_file *m, void *data)
 {
-	struct drm_device *dev;
-	struct dp_debug_private *debug;
-	struct drm_connector *connector;
-	struct drm_connector_list_iter conn_iter;
+	const struct dp_debug_private *debug = m->private;
+	const struct drm_connector *connector = debug->connector;
 	u32 bpc;
 
-	debug = m->private;
-	dev = debug->drm_dev;
-	drm_connector_list_iter_begin(dev, &conn_iter);
-	drm_for_each_connector_iter(connector, &conn_iter) {
-
-		if (connector->connector_type !=
-			DRM_MODE_CONNECTOR_DisplayPort)
-			continue;
-
-		if (connector->status == connector_status_connected) {
-			bpc = debug->link->test_video.test_bit_depth;
-			seq_printf(m, "hdisplay: %d\n",
-					debug->link->test_video.test_h_width);
-			seq_printf(m, "vdisplay: %d\n",
-					debug->link->test_video.test_v_height);
-			seq_printf(m, "bpc: %u\n",
-					dp_link_bit_depth_to_bpc(bpc));
-		} else
-			seq_puts(m, "0");
+	if (connector->status == connector_status_connected) {
+		bpc = debug->link->test_video.test_bit_depth;
+		seq_printf(m, "hdisplay: %d\n",
+				debug->link->test_video.test_h_width);
+		seq_printf(m, "vdisplay: %d\n",
+				debug->link->test_video.test_v_height);
+		seq_printf(m, "bpc: %u\n",
+				dp_link_bit_depth_to_bpc(bpc));
+	} else {
+		seq_puts(m, "0");
 	}
-
-	drm_connector_list_iter_end(&conn_iter);
 
 	return 0;
 }
···
 
 static int dp_test_type_show(struct seq_file *m, void *data)
 {
-	struct dp_debug_private *debug = m->private;
-	struct drm_device *dev = debug->drm_dev;
-	struct drm_connector *connector;
-	struct drm_connector_list_iter conn_iter;
+	const struct dp_debug_private *debug = m->private;
+	const struct drm_connector *connector = debug->connector;
 
-	drm_connector_list_iter_begin(dev, &conn_iter);
-	drm_for_each_connector_iter(connector, &conn_iter) {
-
-		if (connector->connector_type !=
-			DRM_MODE_CONNECTOR_DisplayPort)
-			continue;
-
-		if (connector->status == connector_status_connected)
-			seq_printf(m, "%02x", DP_TEST_LINK_VIDEO_PATTERN);
-		else
-			seq_puts(m, "0");
-	}
-	drm_connector_list_iter_end(&conn_iter);
+	if (connector->status == connector_status_connected)
+		seq_printf(m, "%02x", DP_TEST_LINK_VIDEO_PATTERN);
+	else
+		seq_puts(m, "0");
 
 	return 0;
 }
···
 {
 	char *input_buffer;
 	int status = 0;
-	struct dp_debug_private *debug;
-	struct drm_device *dev;
-	struct drm_connector *connector;
-	struct drm_connector_list_iter conn_iter;
+	const struct dp_debug_private *debug;
+	const struct drm_connector *connector;
 	int val = 0;
 
 	debug = ((struct seq_file *)file->private_data)->private;
-	dev = debug->drm_dev;
+	connector = debug->connector;
 
 	if (len == 0)
 		return 0;
···
 
 	DRM_DEBUG_DRIVER("Copied %d bytes from user\n", (unsigned int)len);
 
-	drm_connector_list_iter_begin(dev, &conn_iter);
-	drm_for_each_connector_iter(connector, &conn_iter) {
-		if (connector->connector_type !=
-			DRM_MODE_CONNECTOR_DisplayPort)
-			continue;
-
-		if (connector->status == connector_status_connected) {
-			status = kstrtoint(input_buffer, 10, &val);
-			if (status < 0)
-				break;
-			DRM_DEBUG_DRIVER("Got %d for test active\n", val);
-			/* To prevent erroneous activation of the compliance
-			 * testing code, only accept an actual value of 1 here
-			 */
-			if (val == 1)
-				debug->panel->video_test = true;
-			else
-				debug->panel->video_test = false;
+	if (connector->status == connector_status_connected) {
+		status = kstrtoint(input_buffer, 10, &val);
+		if (status < 0) {
+			kfree(input_buffer);
+			return status;
 		}
+		DRM_DEBUG_DRIVER("Got %d for test active\n", val);
+		/* To prevent erroneous activation of the compliance
+		 * testing code, only accept an actual value of 1 here
+		 */
+		if (val == 1)
+			debug->panel->video_test = true;
+		else
+			debug->panel->video_test = false;
 	}
-	drm_connector_list_iter_end(&conn_iter);
 	kfree(input_buffer);
-	if (status < 0)
-		return status;
 
 	*offp += len;
 	return len;
···
 static int dp_test_active_show(struct seq_file *m, void *data)
 {
 	struct dp_debug_private *debug = m->private;
-	struct drm_device *dev = debug->drm_dev;
-	struct drm_connector *connector;
-	struct drm_connector_list_iter conn_iter;
+	struct drm_connector *connector = debug->connector;
 
-	drm_connector_list_iter_begin(dev, &conn_iter);
-	drm_for_each_connector_iter(connector, &conn_iter) {
-		if (connector->connector_type !=
-			DRM_MODE_CONNECTOR_DisplayPort)
-			continue;
-
-		if (connector->status == connector_status_connected) {
-			if (debug->panel->video_test)
-				seq_puts(m, "1");
-			else
-				seq_puts(m, "0");
-		} else
+	if (connector->status == connector_status_connected) {
+		if (debug->panel->video_test)
+			seq_puts(m, "1");
+		else
 			seq_puts(m, "0");
+	} else {
+		seq_puts(m, "0");
 	}
-	drm_connector_list_iter_end(&conn_iter);
 
 	return 0;
 }
···
 
 struct dp_debug *dp_debug_get(struct device *dev, struct dp_panel *panel,
 		struct dp_usbpd *usbpd, struct dp_link *link,
-		struct drm_connector **connector, struct drm_minor *minor)
+		struct drm_connector *connector, struct drm_minor *minor)
 {
 	int rc = 0;
 	struct dp_debug_private *debug;

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

···
  */
 struct dp_debug *dp_debug_get(struct device *dev, struct dp_panel *panel,
 		struct dp_usbpd *usbpd, struct dp_link *link,
-		struct drm_connector **connector,
+		struct drm_connector *connector,
 		struct drm_minor *minor);
 
 /**
···
 static inline
 struct dp_debug *dp_debug_get(struct device *dev, struct dp_panel *panel,
 		struct dp_usbpd *usbpd, struct dp_link *link,
-		struct drm_connector **connector, struct drm_minor *minor)
+		struct drm_connector *connector, struct drm_minor *minor)
 {
 	return ERR_PTR(-EINVAL);
 }

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

···
 	dev = &dp->pdev->dev;
 
 	dp->debug = dp_debug_get(dev, dp->panel, dp->usbpd,
-					dp->link, &dp->dp_display.connector,
+					dp->link, dp->dp_display.connector,
 					minor);
 	if (IS_ERR(dp->debug)) {
 		rc = PTR_ERR(dp->debug);