On 2022-04-08 02:53, Bhanuprakash Modem wrote:
> It's useful to know the connector's max supported bpc for IGT
> testing. Expose it via a debugfs file on the connector "output_bpc".
>
> Example: cat /sys/kernel/debug/dri/0/DP-1/output_bpc
>
> Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
> Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> Cc: Harry Wentland <harry.wentland@xxxxxxx>
> Signed-off-by: Bhanuprakash Modem <bhanuprakash.modem@xxxxxxxxx>
> ---
> drivers/gpu/drm/drm_debugfs.c | 21 +++++++++++++++++++++
> 1 file changed, 21 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_debugfs.c b/drivers/gpu/drm/drm_debugfs.c
> index 7f1b82dbaebb..33e5345c6f3e 100644
> --- a/drivers/gpu/drm/drm_debugfs.c
> +++ b/drivers/gpu/drm/drm_debugfs.c
> @@ -395,6 +395,23 @@ static int vrr_range_show(struct seq_file *m, void *data)
> }
> DEFINE_SHOW_ATTRIBUTE(vrr_range);
>
> +/*
> + * Returns Connector's max supported bpc through debugfs file.
> + * Example usage: cat /sys/kernel/debug/dri/0/DP-1/max_bpc
/s/max_bpc/output_bpc
Btw, in amdgpu we have both max_bpc and output_bpc.
Harry
> + */
> +static int output_bpc_show(struct seq_file *m, void *data)
> +{
> + struct drm_connector *connector = m->private;
> +
> + if (connector->status != connector_status_connected)
> + return -ENODEV;
> +
> + seq_printf(m, "Maximum: %u\n", connector->display_info.bpc);
> +
> + return 0;
> +}
> +DEFINE_SHOW_ATTRIBUTE(output_bpc);
> +
> static const struct file_operations drm_edid_fops = {
> .owner = THIS_MODULE,
> .open = edid_open,
> @@ -437,6 +454,10 @@ void drm_debugfs_connector_add(struct drm_connector *connector)
> debugfs_create_file("vrr_range", S_IRUGO, root, connector,
> &vrr_range_fops);
>
> + /* max bpc */
> + debugfs_create_file("output_bpc", 0444, root, connector,
> + &output_bpc_fops);
> +
> if (connector->funcs->debugfs_init)
> connector->funcs->debugfs_init(connector, root);
> }
