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Date:   Sun, 10 Oct 2021 13:57:06 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Sam Ravnborg <sam@...nborg.org>
Cc:     linux-kernel@...r.kernel.org, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org,
        Stanislav Lisovskiy <stanislav.lisovskiy@...el.com>,
        Ville Syrjälä <ville.syrjala@...ux.intel.com>,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        Derek Basehore <dbasehore@...omium.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>
Subject: Re: [PATCH -next] drm/connector: fix all kernel-doc warnings

Hi Sam,

On 10/10/21 1:04 PM, Sam Ravnborg wrote:
> Hi Randy,
> 
> I noticed a few things that in my opinion could be improved.
> See below.
> 
> 	Sam
> 
> 
> On Wed, Oct 06, 2021 at 05:53:05PM -0700, Randy Dunlap wrote:
>> Clean up all of the kernel-doc issues in drm_connector.c:
>>
>> drivers/gpu/drm/drm_connector.c:2611: warning: Excess function parameter 'connector' description in 'drm_connector_oob_hotplug_event'
>> drivers/gpu/drm/drm_connector.c:2611: warning: Function parameter or member 'connector_fwnode' not described in 'drm_connector_oob_hotplug_event'
>>
>> drm_connector.c:630: warning: No description found for return value of 'drm_get_connector_status_name'
>> drm_connector.c:715: warning: No description found for return value of 'drm_connector_list_iter_next'
>> drm_connector.c:785: warning: No description found for return value of 'drm_get_subpixel_order_name'
>> drm_connector.c:816: warning: No description found for return value of 'drm_display_info_set_bus_formats'
>> drm_connector.c:1331: warning: No description found for return value of 'drm_mode_create_dvi_i_properties'
>> drm_connector.c:1412: warning: No description found for return value of 'drm_connector_attach_content_type_property'
>> drm_connector.c:1492: warning: No description found for return value of 'drm_mode_create_tv_margin_properties'
>> drm_connector.c:1534: warning: No description found for return value of 'drm_mode_create_tv_properties'
>> drm_connector.c:1627: warning: No description found for return value of 'drm_mode_create_scaling_mode_property'
>> drm_connector.c:1944: warning: No description found for return value of 'drm_mode_create_suggested_offset_properties'
>>
>> drm_connector.c:2315: warning: missing initial short description on line:
>>   * drm_connector_set_panel_orientation_with_quirk -
>>
>> [The last warning listed is probably a quirk/bug in scripts/kernel-doc.]
>>
>> Fixes: 613051dac40d ("drm: locking&new iterators for connector_list")
>> Fixes: 522171951761 ("drm: Extract drm_connector.[hc]")
>> Fixes: b3c6c8bfe378 ("drm: document drm_display_info")
>> Fixes: 50525c332b55 ("drm: content-type property for HDMI connector")
>> Fixes: 6c4f52dca36f ("drm/connector: Allow creation of margin props alone")
>> Fixes: 69654c632d80 ("drm/connector: Split out orientation quirk detection (v2)")
>> Fixes: 72ad49682dde ("drm/connector: Add support for out-of-band hotplug notification (v3)")
>> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
>> Cc: David Airlie <airlied@...ux.ie>
>> Cc: Daniel Vetter <daniel@...ll.ch>
>> Cc: dri-devel@...ts.freedesktop.org
>> Cc: Stanislav Lisovskiy <stanislav.lisovskiy@...el.com>
>> Cc: Ville Syrjälä <ville.syrjala@...ux.intel.com>
>> Cc: Boris Brezillon <boris.brezillon@...tlin.com>
>> Cc: Derek Basehore <dbasehore@...omium.org>
>> Cc: Hans de Goede <hdegoede@...hat.com>
>> Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
>> Cc: Maxime Ripard <mripard@...nel.org>
>> Cc: Thomas Zimmermann <tzimmermann@...e.de>
>> ---
>> 72ad49682dde ("drm/connector: Add support for out-of-band hotplug notification (v3)")
>>    is only in linux-next. The others are in mainline.
>>
>>   drivers/gpu/drm/drm_connector.c |   30 ++++++++++++++++++++++++++----
>>   1 file changed, 26 insertions(+), 4 deletions(-)
>>
>> --- linux-next-20211006.orig/drivers/gpu/drm/drm_connector.c
>> +++ linux-next-20211006/drivers/gpu/drm/drm_connector.c
>> @@ -625,6 +625,8 @@ int drm_connector_register_all(struct dr
>>    *
>>    * In contrast to the other drm_get_*_name functions this one here returns a
>>    * const pointer and hence is threadsafe.
>> + *
>> + * Returns: connector status string
>>    */
>>   const char *drm_get_connector_status_name(enum drm_connector_status status)
>>   {
>> @@ -707,7 +709,7 @@ __drm_connector_put_safe(struct drm_conn
>>    * drm_connector_list_iter_next - return next connector
>>    * @iter: connector_list iterator
>>    *
>> - * Returns the next connector for @iter, or NULL when the list walk has
>> + * Returns: the next connector for @iter, or NULL when the list walk has
>>    * completed.
>>    */
>>   struct drm_connector *
>> @@ -780,6 +782,8 @@ static const struct drm_prop_enum_list d
>>    *
>>    * Note you could abuse this and return something out of bounds, but that
>>    * would be a caller error.  No unscrubbed user data should make it here.
>> + *
>> + * Returns: string describing an enumerated subpixel property
>>    */
>>   const char *drm_get_subpixel_order_name(enum subpixel_order order)
>>   {
>> @@ -809,6 +813,9 @@ static const struct drm_prop_enum_list d
>>    * Store the supported bus formats in display info structure.
>>    * See MEDIA_BUS_FMT_* definitions in include/uapi/linux/media-bus-format.h for
>>    * a full list of available formats.
>> + *
>> + * Returns:
>> + * Zero on success, negative errno on failure.
> I prefer the following variant:
> "0 on success or a negative error code on failure."
> 
> Then we do not use the overloaded "errno" name.
> At least in include/drm/* my preferred variant is the most popular for
> what it is worth.

OK, I'll change it to that.

> 
>>    */
>>   int drm_display_info_set_bus_formats(struct drm_display_info *info,
>>   				     const u32 *formats,
>> @@ -1326,6 +1333,8 @@ int drm_connector_create_standard_proper
>>    * @dev: DRM device
>>    *
>>    * Called by a driver the first time a DVI-I connector is made.
>> + *
>> + * Returns: %0
> Looks like some macro gone wrong - but I looked it up.
> It is kernel-doc syntax for a named constant.
> 
> My personal preference would be a plain "0" - but that just
> bikeshedding.

Yeah, I would prefer to use kernel-doc notation for constants.
It is documented and has been around for a long time.

I will resend the patch.

Thanks.

-- 
~Randy

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