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Expose it via a debugfs file on the connector "output_bpc". > > Example: cat /sys/kernel/debug/dri/0/DP-1/output_bpc > > V2: > * Fix typo in comments (Harry) > > Cc: Jani Nikula > Cc: Ville Syrjälä > Cc: Harry Wentland > Signed-off-by: Bhanuprakash Modem Reviewed-by: Harry Wentland Harry > --- > 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..fb04b7a984de 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/output_bpc > + */ > +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); > }