drm/i915/dp: Add debugfs entry to get the link retrain disabled state

Add a connector debugfs entry showing if link retraining is disabled.

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240610164933.2947366-22-imre.deak@intel.com

diff --git a/drivers/gpu/drm/i915/display/intel_dp_link_training.c b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
index 4da550d6e0ffc0ac7ba2a9b45a977511369dc0cf..1bc4ef84ff3bcda93940f172843e9a83be8d2625 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
@@ -1898,6 +1898,25 @@ DEFINE_DEBUGFS_ATTRIBUTE(i915_dp_force_link_retrain_fops,
                         i915_dp_force_link_retrain_show,
                         i915_dp_force_link_retrain_write, "%llu\n");
 
+static int i915_dp_link_retrain_disabled_show(struct seq_file *m, void *data)
+{
+       struct intel_connector *connector = to_intel_connector(m->private);
+       struct drm_i915_private *i915 = to_i915(connector->base.dev);
+       struct intel_dp *intel_dp = intel_connector_to_intel_dp(connector);
+       int err;
+
+       err = drm_modeset_lock_single_interruptible(&i915->drm.mode_config.connection_mutex);
+       if (err)
+               return err;
+
+       seq_printf(m, "%s\n", str_yes_no(intel_dp->link.retrain_disabled));
+
+       drm_modeset_unlock(&i915->drm.mode_config.connection_mutex);
+
+       return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(i915_dp_link_retrain_disabled);
+
 void intel_dp_link_training_debugfs_add(struct intel_connector *connector)
 {
        struct dentry *root = connector->base.debugfs_entry;
@@ -1923,4 +1942,7 @@ void intel_dp_link_training_debugfs_add(struct intel_connector *connector)
 
        debugfs_create_file("i915_dp_force_link_retrain", 0644, root,
                            connector, &i915_dp_force_link_retrain_fops);
+
+       debugfs_create_file("i915_dp_link_retrain_disabled", 0444, root,
+                           connector, &i915_dp_link_retrain_disabled_fops);
 }