[v9 2/3] drm/debug: Expose connector VRR monitor range via debugfs

[Manasi Navare]

Thanks Bhanu for the patch, merged to drm-misc

Manasi

On Mon, Jun 22, 2020 at 07:55:18PM +0530, Bhanuprakash Modem wrote:
> [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
> 
> 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)
> v3:
> * Remove the unnecessary debug print (Manasi)
> v4:
> * Rebase
> v5:
> * Rename to vrr_range to match AMD debugfs
> v6:
> * Rebase (manasi)
> v7:
> * Fix cmpilation due to rebase
> v8:
> * Move debugfs node creation logic to DRM (Emil)
> * Remove AMD specific logic (Emil)
> v9:
> * Seperate patch for removal of AMD specific logic (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>
> Cc: Harry Wentland <harry.wentland at amd.com>
> CC: Emil Velikov <emil.l.velikov at gmail.com>
> ---
>  drivers/gpu/drm/drm_debugfs.c | 22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_debugfs.c b/drivers/gpu/drm/drm_debugfs.c
> index bfe4602f206b..3d7182001004 100644
> --- a/drivers/gpu/drm/drm_debugfs.c
> +++ b/drivers/gpu/drm/drm_debugfs.c
> @@ -376,6 +376,24 @@ static ssize_t edid_write(struct file *file, const char __user *ubuf,
>  	return (ret) ? ret : len;
>  }
>  
> +/*
> + * Returns the min and max vrr vfreq through the connector's debugfs file.
> + * Example usage: cat /sys/kernel/debug/dri/0/DP-1/vrr_range
> + */
> +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, "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);
> +
>  static const struct file_operations drm_edid_fops = {
>  	.owner = THIS_MODULE,
>  	.open = edid_open,
> @@ -413,6 +431,10 @@ void drm_debugfs_connector_add(struct drm_connector *connector)
>  	/* edid */
>  	debugfs_create_file("edid_override", S_IRUGO | S_IWUSR, root, connector,
>  			    &drm_edid_fops);
> +
> +	/* vrr range */
> +	debugfs_create_file("vrr_range", S_IRUGO, root, connector,
> +			    &vrr_range_fops);
>  }
>  
>  void drm_debugfs_connector_remove(struct drm_connector *connector)
> -- 
> 2.20.1
> 
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