[PATCH 14/17] drm/i915: Add debugfs function to check connector status for compliance testing

[Todd Previte <tprevite@gmail.com>]

Adds a function to check the status of a Displayport connector. This function
simplifies the Displayport compliance testing interface in debugfs by providing
a single method for determining the status of a connector during Displayport
compliance testing. This function checks whether or not the connector is a
Displayport connector and whether or not that connector is active.

Signed-off-by: Todd Previte <tprevite@gmail.com>
---
 drivers/gpu/drm/i915/i915_debugfs.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 5eb6c24..978ddd1 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -3920,6 +3920,35 @@ static int displayport_parse_config(char *input_buffer,
 	return status;
 }
 
+static bool dp_connector_is_valid(struct drm_connector *connector,
+				  bool check_active)
+{
+	struct intel_encoder *intel_encoder;
+	struct intel_connector *intel_connector;
+
+	intel_connector = to_intel_connector(connector);
+	intel_encoder = intel_connector->encoder;
+
+	if (connector->connector_type != DRM_MODE_CONNECTOR_DisplayPort)
+		goto no;
+
+	if (intel_encoder->type != INTEL_OUTPUT_DISPLAYPORT &&
+	    intel_encoder->type != INTEL_OUTPUT_UNKNOWN)
+		goto no;
+
+	if (check_active) {
+		if (connector->status == connector_status_connected)
+			goto yes;
+		else
+			goto no;
+	}
+
+yes:
+	return true;
+no:
+	return false;
+}
+
 static int displayport_config_ctl_show(struct seq_file *m, void *data)
 {
 	struct drm_device *dev = m->private;
-- 
1.9.1

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