From: Bhanuprakash Modem bhanuprakash.modem@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.modem@intel.com Signed-off-by: Manasi Navare manasi.d.navare@intel.com Cc: Jani Nikula jani.nikula@linux.intel.com Cc: Ville Syrjälä ville.syrjala@linux.intel.com Tested-by: Manasi Navare manasi.d.navare@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)) &&