[PATCH v2 18/21] drm/i915/dp: Add debugfs entries to get the max link rate/lane count

Imre Deak
2024-05-20T18:58:40Z

Add connector debugfs entries to get the maximum link rate and lane
count.

Signed-off-by: Imre Deak <imre.deak@intel.com>
---
.../drm/i915/display/intel_dp_link_training.c | 46 +++++++++++++++++++
1 file changed, 46 insertions(+)

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 a6021e17cc1ef..764187bc42ff9 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
@@ -1759,6 +1759,46 @@ static ssize_t i915_dp_set_lane_count_write(struct file *file,
}
DEFINE_SHOW_STORE_ATTRIBUTE(i915_dp_set_lane_count);

+static int i915_dp_max_link_rate_show(void *data, u64 *val)
+{
+ struct intel_connector *connector = to_intel_connector(data);
+ struct drm_i915_private *i915 = to_i915(connector->base.dev);
+ struct intel_dp *intel_dp;
+ int err;
+
+ err = drm_modeset_lock_single_interruptible(&i915->drm.mode_config.connection_mutex);
+ if (err)
+ return err;
+
+ intel_dp = intel_connector_to_intel_dp(connector);
+ *val = intel_dp->link.max_rate;
+
+ drm_modeset_unlock(&i915->drm.mode_config.connection_mutex);
+
+ return 0;
+}
+DEFINE_DEBUGFS_ATTRIBUTE(i915_dp_max_link_rate_fops, i915_dp_max_link_rate_show, NULL, "%llu\n");
+
+static int i915_dp_max_lane_count_show(void *data, u64 *val)
+{
+ struct intel_connector *connector = to_intel_connector(data);
+ struct drm_i915_private *i915 = to_i915(connector->base.dev);
+ struct intel_dp *intel_dp;
+ int err;
+
+ err = drm_modeset_lock_single_interruptible(&i915->drm.mode_config.connection_mutex);
+ if (err)
+ return err;
+
+ intel_dp = intel_connector_to_intel_dp(connector);
+ *val = intel_dp->link.max_lane_count;
+
+ drm_modeset_unlock(&i915->drm.mode_config.connection_mutex);
+
+ return 0;
+}
+DEFINE_DEBUGFS_ATTRIBUTE(i915_dp_max_lane_count_fops, i915_dp_max_lane_count_show, NULL, "%llu\n");
+
void intel_dp_link_training_debugfs_add(struct intel_connector *connector)
{
struct dentry *root = connector->base.debugfs_entry;
@@ -1772,4 +1812,10 @@ void intel_dp_link_training_debugfs_add(struct intel_connector *connector)

debugfs_create_file("i915_dp_set_lane_count", 0644, root,
connector, &i915_dp_set_lane_count_fops);
+
+ debugfs_create_file("i915_dp_max_link_rate", 0444, root,
+ connector, &i915_dp_max_link_rate_fops);
+
+ debugfs_create_file("i915_dp_max_lane_count", 0444, root,
+ connector, &i915_dp_max_lane_count_fops);
}
--
2.43.3