[PATCH v4 3/3] drm/i915/dp: Expose connector VRR info via debugfs

[Manasi Navare]

From: Bhanuprakash Modem <bhanuprakash.modem at intel.com>

[Why]
It's useful to know the min and max vrr range for IGT testing.

[How]
Expose the min and max vfreq for the connector via a debugfs file
on the connector, "i915_vrr_info".

Example usage: cat /sys/kernel/debug/dri/0/DP-1/i915_vrr_info

v3:
* Remove the unnecessary debug print (Manasi)
v2:
* Fix the typo in max_vfreq (Manasi)
* Change the name of node to i915_vrr_info so we can add
other vrr info for more debug info (Manasi)
* Change the VRR capable to display Yes or No (Manasi)
* Fix indentation checkpatch errors (Manasi)

Signed-off-by: Bhanuprakash Modem <bhanuprakash.modem at intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare at intel.com>
Cc: Jani Nikula <jani.nikula at linux.intel.com>
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Tested-by: Manasi Navare <manasi.d.navare at intel.com>
---
 .../drm/i915/display/intel_display_debugfs.c  | 22 ++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display_debugfs.c b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
index bdeea2e02642..35b229ab4d19 100644
--- a/drivers/gpu/drm/i915/display/intel_display_debugfs.c
+++ b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
@@ -2096,6 +2096,21 @@ static const struct file_operations i915_dsc_fec_support_fops = {
 	.write = i915_dsc_fec_support_write
 };
 
+static int i915_vrr_info_show(struct seq_file *m, void *data)
+{
+	struct drm_connector *connector = m->private;
+
+	if (connector->status != connector_status_connected)
+		return -ENODEV;
+
+	seq_printf(m, "Vrr_capable: %s\n", yesno(intel_dp_is_vrr_capable(connector)));
+	seq_printf(m, "Min: %u\n", (u8)connector->display_info.monitor_range.min_vfreq);
+	seq_printf(m, "Max: %u\n", (u8)connector->display_info.monitor_range.max_vfreq);
+
+	return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(i915_vrr_info);
+
 /**
  * intel_connector_debugfs_add - add i915 specific connector debugfs files
  * @connector: pointer to a registered drm_connector
@@ -2130,9 +2145,14 @@ int intel_connector_debugfs_add(struct drm_connector *connector)
 
 	if (INTEL_GEN(dev_priv) >= 10 &&
 	    (connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort ||
-	     connector->connector_type == DRM_MODE_CONNECTOR_eDP))
+	     connector->connector_type == DRM_MODE_CONNECTOR_eDP)) {
 		debugfs_create_file("i915_dsc_fec_support", S_IRUGO, root,
 				    connector, &i915_dsc_fec_support_fops);
 
+		if (INTEL_GEN(dev_priv) >= 12)
+			debugfs_create_file("i915_vrr_info", S_IRUGO,
+					    root, connector, &i915_vrr_info_fops);
+	}
+
 	return 0;
 }
-- 
2.19.1