On 3/21/2024 1:41 AM, Imre Deak wrote:
Add a function to get the AUX device of the parent of an MST port, used by a follow-up i915 patch in the patchset. Cc: Lyude Paul <ly...@redhat.com> Cc: dri-devel@lists.freedesktop.org Signed-off-by: Imre Deak <imre.d...@intel.com> --- drivers/gpu/drm/display/drm_dp_mst_topology.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/gpu/drm/display/drm_dp_mst_topology.c b/drivers/gpu/drm/display/drm_dp_mst_topology.c index 6bd471a2266ce..d70f7de644371 100644 --- a/drivers/gpu/drm/display/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/display/drm_dp_mst_topology.c @@ -6004,6 +6004,22 @@ static bool drm_dp_mst_is_virtual_dpcd(struct drm_dp_mst_port *port) return false; }+/**+ * drm_dp_mst_aux_for_parent() - Get the AUX device for an MST port's parent + * @port: MST port whose parent's AUX device is returned + * + * Return the AUX device for @port's parent or NULL if port's parent is the + * root port. + */ +struct drm_dp_aux *drm_dp_mst_aux_for_parent(struct drm_dp_mst_port *port) +{ + if (!port->parent || !port->parent->port_parent) + return NULL; + + return &port->parent->port_parent->aux; +} +EXPORT_SYMBOL(drm_dp_mst_aux_for_parent);
As mentioned in previous patch, the declaration of this in the header, got included in previous patch.
Regards, Ankit
+ /** * drm_dp_mst_dsc_aux_for_port() - Find the correct aux for DSC * @port: The port to check. A leaf of the MST tree with an attached display.
