linux-kernel - Re: [PATCH 3/4] drm/uapi: document the USB subconnector type

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Date:   Wed, 02 Aug 2023 22:23:14 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
CC:     David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <rfoss@...nel.org>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Simon Ser <contact@...rsion.fr>, Janne Grunau <j@...nau.net>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        Harry Wentland <harry.wentland@....com>,
        Leo Li <sunpeng.li@....com>,
        Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, intel-gfx@...ts.freedesktop.org
Subject: Re: [PATCH 3/4] drm/uapi: document the USB subconnector type

2 августа 2023 г. 22:13:51 GMT+03:00, Laurent Pinchart <laurent.pinchart@...asonboard.com> пишет:
>On Wed, Aug 02, 2023 at 10:01:19PM +0300, Dmitry Baryshkov wrote:
>> On 02/08/2023 21:55, Laurent Pinchart wrote:
>> > Hi Dmitry,
>> > 
>> > Thank you for the patch.
>> > 
>> > On Sat, Jul 29, 2023 at 03:49:12AM +0300, Dmitry Baryshkov wrote:
>> >> To properly define the USB-C DP altmode connectors, add the USB
>> >> subconnector type.
>> >>
>> >> Suggested-by: Simon Ser <contact@...rsion.fr>
>> >> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
>> >> ---
>> >>   drivers/gpu/drm/drm_connector.c | 1 +
>> >>   include/uapi/drm/drm_mode.h     | 1 +
>> >>   2 files changed, 2 insertions(+)
>> >>
>> >> diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
>> >> index a6066e4a5e9a..9e96b038f5d0 100644
>> >> --- a/drivers/gpu/drm/drm_connector.c
>> >> +++ b/drivers/gpu/drm/drm_connector.c
>> >> @@ -1050,6 +1050,7 @@ static const struct drm_prop_enum_list drm_dp_subconnector_enum_list[] = {
>> >>   	{ DRM_MODE_SUBCONNECTOR_DisplayPort, "DP"        }, /* DP */
>> >>   	{ DRM_MODE_SUBCONNECTOR_Wireless,    "Wireless"  }, /* DP */
>> >>   	{ DRM_MODE_SUBCONNECTOR_Native,	     "Native"    }, /* DP */
>> >> +	{ DRM_MODE_SUBCONNECTOR_USB,	     "USB"       }, /* DP */
>> > 
>> > Should this be DRM_MODE_SUBCONNECTOR_USB_C and "USB-C", in case we get
>> > another USB type later ?
>> 
>> Hmm, which id should I use for micro-USB then? (consider anx7808, 
>> SlimPort). I thought about using DRM_MODE_SUBCONNECTOR_USB for both of 
>> them. But maybe I should add another subtype for SlimPort.
>
>I suppose it depends on whether userspace needs a way to differentiate
>those. Do you have a good visibility on the userspace use cases ?

No. I'm not even sure, which userspace handles subtypes properly.

For the reference, SlimPort is mostly legacy hardware, think about Nexus 4, 5, 6, 7 (2013)


>
>> >>   };
>> >>   
>> >>   DRM_ENUM_NAME_FN(drm_get_dp_subconnector_name,
>> >> diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
>> >> index 92d96a2b6763..0f74918b011c 100644
>> >> --- a/include/uapi/drm/drm_mode.h
>> >> +++ b/include/uapi/drm/drm_mode.h
>> >> @@ -398,6 +398,7 @@ enum drm_mode_subconnector {
>> >>   	DRM_MODE_SUBCONNECTOR_HDMIA       = 11, /*            DP */
>> >>   	DRM_MODE_SUBCONNECTOR_Native      = 15, /*            DP */
>> >>   	DRM_MODE_SUBCONNECTOR_Wireless    = 18, /*            DP */
>> >> +	DRM_MODE_SUBCONNECTOR_USB         = 20, /*            DP */
>> >>   };
>> >>   
>> >>   #define DRM_MODE_CONNECTOR_Unknown	0
>