On Wed, May 13, 2020 at 04:08:38AM -0700, Modem, Bhanuprakash wrote:
> -----Original Message-----
> From: Navare, Manasi D <[email protected]>
> Sent: Wednesday, May 13, 2020 11:05 AM
> To: [email protected]; [email protected]
> Cc: Modem, Bhanuprakash <[email protected]>; Navare, Manasi D
> <[email protected]>; Jani Nikula <[email protected]>; Ville
> Syrjälä <[email protected]>
> Subject: [PATCH v5 3/3] drm/i915/dp: Expose connector VRR info via debugfs
>
> From: Bhanuprakash Modem <[email protected]>
>
> [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
>
> [Bhanu]: Can you please fix the commit message? 's/i915_vrr_info/vrr_range/'
>
> 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 <[email protected]>
> Signed-off-by: Manasi Navare <[email protected]>
> Cc: Jani Nikula <[email protected]>
> Cc: Ville Syrjälä <[email protected]>
> Tested-by: Manasi Navare <[email protected]>
> ---
> .../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 70525623bcdf..a0d680c13e0d 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)));
> [Bhanu]: As we can read "vrr_capable" property from
> DRM_IOCTL_MODE_OBJ_GETPROPERTIES ioctl, I think we don't need to expose
> "vrr_capable" through debugfs.
Yes we can get it with the Get prop IOCTL, but having it in debugfs will still
be a good debug info without
needing to call the ioctl
Manasi
> +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 @@ -2219,10 +2234,15 @@
> 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("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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