Re: [PATCH] drm/msm/dp: Use the connector passed to dp_debug_get()

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On 2021-10-09 20:04, Bjorn Andersson wrote:
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.


Change itself is fine, hence
Reviewed-by: Abhinav Kumar <abhinavk@xxxxxxxxxxxxxx>
What has to be checked now is now to create multiple DP nodes for multi-DP cases. 
Today, the debug node will be created only once :

https://gitlab.freedesktop.org/drm/msm/-/blob/msm-next/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c#L206
This also needs to be expanded for multi-DP to make the solution complete. 


Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
---
 drivers/gpu/drm/msm/dp/dp_debug.c   | 131 ++++++++++------------------
 drivers/gpu/drm/msm/dp/dp_debug.h   |   2 +-
 drivers/gpu/drm/msm/dp/dp_display.c |   2 +-
 3 files changed, 46 insertions(+), 89 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_debug.c
b/drivers/gpu/drm/msm/dp/dp_debug.c
index af709d93bb9f..da4323556ef3 100644
--- a/drivers/gpu/drm/msm/dp/dp_debug.c
+++ b/drivers/gpu/drm/msm/dp/dp_debug.c
@@ -24,7 +24,7 @@ struct dp_debug_private {
 	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;

@@ -97,59 +97,35 @@ DEFINE_SHOW_ATTRIBUTE(dp_debug);

 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;
 }
 DEFINE_SHOW_ATTRIBUTE(dp_test_data);

 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;
-
-	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;
+	const struct dp_debug_private *debug = m->private;
+	const struct drm_connector *connector = debug->connector;

-		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;
 }
@@ -161,14 +137,12 @@ static ssize_t dp_test_active_write(struct file *file, 
 {
 	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;
@@ -179,30 +153,22 @@ static ssize_t dp_test_active_write(struct file *file, 

 	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;
@@ -211,25 +177,16 @@ static ssize_t dp_test_active_write(struct file *file, 
 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;
-
-	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
+	struct drm_connector *connector = debug->connector;
+
+	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;
 }
@@ -278,7 +235,7 @@ static int dp_debug_init(struct dp_debug
*dp_debug, struct drm_minor *minor)
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;
diff --git a/drivers/gpu/drm/msm/dp/dp_debug.h
b/drivers/gpu/drm/msm/dp/dp_debug.h
index 7eaedfbb149c..3f90acfffc5a 100644
--- a/drivers/gpu/drm/msm/dp/dp_debug.h
+++ b/drivers/gpu/drm/msm/dp/dp_debug.h
@@ -43,7 +43,7 @@ struct dp_debug {
  */
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);

 /**
diff --git a/drivers/gpu/drm/msm/dp/dp_display.c
b/drivers/gpu/drm/msm/dp/dp_display.c
index 1708b7cdc1b3..41a6f58916e6 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -1464,7 +1464,7 @@ void msm_dp_debugfs_init(struct msm_dp
*dp_display, struct drm_minor *minor)
 	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);
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