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drm/debug: Expose connector's max supported bpc via debugfs

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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

V2:
* Fix typo in comments (Harry)

Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Bhanuprakash Modem <bhanuprakash.modem@intel.com>
Reviewed-by: Arun R Murthy <arun.r.murthy@intel.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220519095149.3560034-2-bhanuprakash.modem@intel.com
This commit is contained in:
Bhanuprakash Modem 2022-05-19 15:21:47 +05:30 committed by Jani Nikula
parent 6556551f88
commit 67d935b471
1 changed files with 21 additions and 0 deletions
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21
drivers/gpu/drm/drm_debugfs.c
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@ -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);
}