It's useful to know the connector's max supported bpc for IGT
testing. Expose it via a debugfs file on the connector "output_bpc".
Example: cat /sys/kernel/debug/dri/0/DP-1/output_bpc
Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Cc: Harry Wentland <harry.wentland@xxxxxxx>
Signed-off-by: Bhanuprakash Modem <bhanuprakash.modem@xxxxxxxxx>
---
drivers/gpu/drm/drm_debugfs.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/drivers/gpu/drm/drm_debugfs.c b/drivers/gpu/drm/drm_debugfs.c
index 7f1b82dbaebb..33e5345c6f3e 100644
--- a/drivers/gpu/drm/drm_debugfs.c
+++ b/drivers/gpu/drm/drm_debugfs.c
@@ -395,6 +395,23 @@ static int vrr_range_show(struct seq_file *m, void *data)
}
DEFINE_SHOW_ATTRIBUTE(vrr_range);
+/*
+ * Returns Connector's max supported bpc through debugfs file.
+ * Example usage: cat /sys/kernel/debug/dri/0/DP-1/max_bpc
+ */
+static int output_bpc_show(struct seq_file *m, void *data)
+{
+ struct drm_connector *connector = m->private;
+
+ if (connector->status != connector_status_connected)
+ return -ENODEV;
+
+ seq_printf(m, "Maximum: %u\n", connector->display_info.bpc);
+
+ return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(output_bpc);
+
static const struct file_operations drm_edid_fops = {
.owner = THIS_MODULE,
.open = edid_open,
@@ -437,6 +454,10 @@ void drm_debugfs_connector_add(struct drm_connector *connector)
debugfs_create_file("vrr_range", S_IRUGO, root, connector,
&vrr_range_fops);
+ /* max bpc */
+ debugfs_create_file("output_bpc", 0444, root, connector,
+ &output_bpc_fops);
+
if (connector->funcs->debugfs_init)
connector->funcs->debugfs_init(connector, root);
}
--
2.35.1
