From: Bhanuprakash Modem <bhanuprakash.mo...@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, "vrr_range".
Example usage: cat /sys/kernel/debug/dri/0/DP-1/vrr_range
v6:
* Rebase (manasi)
v5:
* Rename to vrr_range to match AMD debugfs
v4:
* Rebase
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.mo...@intel.com>
Signed-off-by: Manasi Navare <manasi.d.nav...@intel.com>
Cc: Jani Nikula <jani.nik...@linux.intel.com>
Cc: Ville Syrjälä <ville.syrj...@linux.intel.com>
Tested-by: Manasi Navare <manasi.d.nav...@intel.com>
---
.../drm/i915/display/intel_display_debugfs.c | 20 +++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_display_debugfs.c
b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
index 28dd717e943a..fc05d3468a7b 100644
--- a/drivers/gpu/drm/i915/display/intel_display_debugfs.c
+++ b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
@@ -2185,6 +2185,21 @@ static const struct file_operations
i915_dsc_fec_support_fops = {
.write = i915_dsc_fec_support_write
};
+static int vrr_range_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(vrr_range);
+
/**
* intel_connector_debugfs_add - add i915 specific connector debugfs files
* @connector: pointer to a registered drm_connector
@@ -2224,6 +2239,11 @@ int intel_connector_debugfs_add(struct drm_connector
*connector)
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("vrr_range", S_IRUGO,
+ root, connector, &vrr_range_fops);
+ }
+
/* Legacy panels doesn't lpsp on any platform */
if ((INTEL_GEN(dev_priv) >= 9 || IS_HASWELL(dev_priv) ||
IS_BROADWELL(dev_priv)) &&
--
2.19.1
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