diff options
| author | Simon Ser <contact@emersion.fr> | 2023-10-23 23:36:39 +0300 |
|---|---|---|
| committer | Simon Ser <contact@emersion.fr> | 2023-10-27 17:01:10 +0300 |
| commit | 88b02ebca8b6ea7457bed6809b1dd575420b7544 (patch) | |
| tree | 99de17a24ef5f37d41fac5913d2f2782b5902065 /drivers/gpu/drm/drm_connector.c | |
| parent | d208d875667e2a29beeec5d475f4b6b164b632fa (diff) | |
| download | linux-88b02ebca8b6ea7457bed6809b1dd575420b7544.tar.xz | |
drm/doc: describe PATH format for DP MST
This is already uAPI, xserver parses it. It's useful to document
since user-space might want to lookup the parent connector.
Additionally, people (me included) have misunderstood the PATH
property for being stable across reboots, but since a KMS object
ID is baked in there that's not the case. So PATH shouldn't be
used as-is in config files and such.
Signed-off-by: Simon Ser <contact@emersion.fr>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Acked-by: Pekka Paalanen <pekka.paalanen@collabora.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20231023203629.198109-1-contact@emersion.fr
Diffstat (limited to 'drivers/gpu/drm/drm_connector.c')
| -rw-r--r-- | drivers/gpu/drm/drm_connector.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c index c3725086f413..b0516505f7ae 100644 --- a/drivers/gpu/drm/drm_connector.c +++ b/drivers/gpu/drm/drm_connector.c @@ -1198,6 +1198,12 @@ static const u32 dp_colorspaces = * drm_connector_set_path_property(), in the case of DP MST with the * path property the MST manager created. Userspace cannot change this * property. + * + * In the case of DP MST, the property has the format + * ``mst:<parent>-<ports>`` where ``<parent>`` is the KMS object ID of the + * parent connector and ``<ports>`` is a hyphen-separated list of DP MST + * port numbers. Note, KMS object IDs are not guaranteed to be stable + * across reboots. * TILE: * Connector tile group property to indicate how a set of DRM connector * compose together into one logical screen. This is used by both high-res |