This patch series looks awesome so far, thank you for the great work! This
patch looks great, I think we should just squash it into the next patch though
since we don't use this function until then.
On Wed, 2020-01-08 at 16:44 +0800, Wayne Lin wrote:
> [Why]
> For later usage convenience, add the function
> drm_dp_mst_is_dp_mst_end_device() to decide whether a peer device
> connected to a DFP is mst end device. Which also indicates if the peer
> device is capable of handling message or not.
>
> Signed-off-by: Wayne Lin <Wayne.Lin@xxxxxxx>
> ---
> drivers/gpu/drm/drm_dp_mst_topology.c | 16 ++++++++++++++++
> 1 file changed, 16 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c
> b/drivers/gpu/drm/drm_dp_mst_topology.c
> index eebf325d7f48..8f54b241db08 100644
> --- a/drivers/gpu/drm/drm_dp_mst_topology.c
> +++ b/drivers/gpu/drm/drm_dp_mst_topology.c
> @@ -1918,6 +1918,22 @@ static u8 drm_dp_calculate_rad(struct drm_dp_mst_port
> *port,
> return parent_lct + 1;
> }
>
> +static bool drm_dp_mst_is_dp_mst_end_device(u8 pdt, bool mcs)
> +{
> + switch (pdt) {
> + case DP_PEER_DEVICE_DP_LEGACY_CONV:
> + case DP_PEER_DEVICE_SST_SINK:
> + return true;
> + case DP_PEER_DEVICE_MST_BRANCHING:
> + /* For sst branch device */
> + if (!mcs)
> + return true;
> +
> + return false;
> + }
> + return true;
> +}
> +
> static int drm_dp_port_set_pdt(struct drm_dp_mst_port *port, u8 new_pdt)
> {
> struct drm_dp_mst_topology_mgr *mgr = port->mgr;
--
Cheers,
Lyude Paul
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