[PATCH 2/3] drm/dp_mst: Expose build_mst_prop_path()

[Lyude Paul]

Closer, but are we sure we want to use the MST prop path for this? Why not add
a sysfs attribute with the corresponding DRM connector name instead since the
connector itself will have a path property. That way we can associate aux
devices for eDP and DP devices with their corresponding connectors as well

On Mon, 2019-04-22 at 19:56 -0400, sunpeng.li at amd.com wrote:
> From: Leo Li <sunpeng.li at amd.com>
> 
> To give identifiable attributes to MST DP aux devices, we can use the
> MST relative address. Expose this function for later use.
> 
> Signed-off-by: Leo Li <sunpeng.li at amd.com>
> ---
>  drivers/gpu/drm/drm_dp_mst_topology.c | 4 ++--
>  include/drm/drm_dp_mst_helper.h       | 4 ++++
>  2 files changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c
> b/drivers/gpu/drm/drm_dp_mst_topology.c
> index 2ab16c9..86ff8e2 100644
> --- a/drivers/gpu/drm/drm_dp_mst_topology.c
> +++ b/drivers/gpu/drm/drm_dp_mst_topology.c
> @@ -1120,7 +1120,7 @@ static void drm_dp_check_mstb_guid(struct
> drm_dp_mst_branch *mstb, u8 *guid)
>  	}
>  }
>  
> -static void build_mst_prop_path(const struct drm_dp_mst_branch *mstb,
> +void drm_dp_build_mst_prop_path(const struct drm_dp_mst_branch *mstb,
>  				int pnum,
>  				char *proppath,
>  				size_t proppath_size)
> @@ -1202,7 +1202,7 @@ static void drm_dp_add_port(struct drm_dp_mst_branch
> *mstb,
>  	if (created && !port->input) {
>  		char proppath[255];
>  
> -		build_mst_prop_path(mstb, port->port_num, proppath,
> sizeof(proppath));
> +		drm_dp_build_mst_prop_path(mstb, port->port_num, proppath,
> sizeof(proppath));
>  		port->connector = (*mstb->mgr->cbs->add_connector)(mstb->mgr,
> port, proppath);
>  		if (!port->connector) {
>  			/* remove it from the port list */
> diff --git a/include/drm/drm_dp_mst_helper.h
> b/include/drm/drm_dp_mst_helper.h
> index 371cc28..81c8d79 100644
> --- a/include/drm/drm_dp_mst_helper.h
> +++ b/include/drm/drm_dp_mst_helper.h
> @@ -602,6 +602,10 @@ void drm_dp_mst_deallocate_vcpi(struct
> drm_dp_mst_topology_mgr *mgr,
>  int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr,
>  			   int pbn);
>  
> +void drm_dp_build_mst_prop_path(const struct drm_dp_mst_branch *mstb,
> +				   int pnum,
> +				   char *proppath,
> +				   size_t proppath_size);
>  
>  int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr);
>  
-- 
Cheers,
	Lyude Paul