[alsa-devel] [Intel-gfx] [PATCH V4 1/2] dp/mst: add SDP stream support

[Libin Yang]

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Best Regards,
Libin

On 12/02/2015 02:09 PM, libin.yang at linux.intel.com wrote:
> From: Libin Yang <libin.yang at linux.intel.com>
>
> This adds code to initialise the SDP streams
> for a sink in the simplest ordering.
>
> I've no idea how you'd want to control the
> ordering at this level, so don't bother
> until someone comes up with a use case.
>
> Reviewed-by: Ander Conselvan de Oliveira <conselvan2 at gmail.com>
> Signed-off-by: Libin Yang <libin.yang at linux.intel.com>
> Signed-off-by: Dave Airlie <airlied at redhat.com>
> ---
>   drivers/gpu/drm/drm_dp_mst_topology.c | 38 ++++++++++++++++++++++++++++++++---
>   include/drm/drm_dp_mst_helper.h       |  7 +++++--
>   2 files changed, 40 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
> index 809959d..f50eb7b 100644
> --- a/drivers/gpu/drm/drm_dp_mst_topology.c
> +++ b/drivers/gpu/drm/drm_dp_mst_topology.c
> @@ -666,7 +666,9 @@ static int build_enum_path_resources(struct drm_dp_sideband_msg_tx *msg, int por
>   }
>
>   static int build_allocate_payload(struct drm_dp_sideband_msg_tx *msg, int port_num,
> -				  u8 vcpi, uint16_t pbn)
> +				  u8 vcpi, uint16_t pbn,
> +				  u8 number_sdp_streams,
> +				  u8 *sdp_stream_sink)
>   {
>   	struct drm_dp_sideband_msg_req_body req;
>   	memset(&req, 0, sizeof(req));
> @@ -674,6 +676,9 @@ static int build_allocate_payload(struct drm_dp_sideband_msg_tx *msg, int port_n
>   	req.u.allocate_payload.port_number = port_num;
>   	req.u.allocate_payload.vcpi = vcpi;
>   	req.u.allocate_payload.pbn = pbn;
> +	req.u.allocate_payload.number_sdp_streams = number_sdp_streams;
> +	memcpy(req.u.allocate_payload.sdp_stream_sink, sdp_stream_sink,
> +		   number_sdp_streams);
>   	drm_dp_encode_sideband_req(&req, msg);
>   	msg->path_msg = true;
>   	return 0;
> @@ -1562,6 +1567,8 @@ static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr,
>   	struct drm_dp_sideband_msg_tx *txmsg;
>   	struct drm_dp_mst_branch *mstb;
>   	int len, ret;
> +	u8 sinks[DRM_DP_MAX_SDP_STREAMS];
> +	int i;
>
>   	mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent);
>   	if (!mstb)
> @@ -1573,10 +1580,13 @@ static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr,
>   		goto fail_put;
>   	}
>
> +	for (i = 0; i < port->num_sdp_streams; i++)
> +		sinks[i] = i;
> +
>   	txmsg->dst = mstb;
>   	len = build_allocate_payload(txmsg, port->port_num,
>   				     id,
> -				     pbn);
> +				     pbn, port->num_sdp_streams, sinks);
>
>   	drm_dp_queue_down_tx(mgr, txmsg);
>
> @@ -2259,6 +2269,27 @@ out:
>   EXPORT_SYMBOL(drm_dp_mst_detect_port);
>
>   /**
> + * drm_dp_mst_port_has_audio() - Check whether port has audio capability or not
> + * @mgr: manager for this port
> + * @port: unverified pointer to a port.
> + *
> + * This returns whether the port supports audio or not.
> + */
> +bool drm_dp_mst_port_has_audio(struct drm_dp_mst_topology_mgr *mgr,
> +					struct drm_dp_mst_port *port)
> +{
> +	bool ret = false;
> +
> +	port = drm_dp_get_validated_port_ref(mgr, port);
> +	if (!port)
> +		return ret;
> +	ret = port->has_audio;
> +	drm_dp_put_port(port);
> +	return ret;
> +}
> +EXPORT_SYMBOL(drm_dp_mst_port_has_audio);
> +
> +/**
>    * drm_dp_mst_get_edid() - get EDID for an MST port
>    * @connector: toplevel connector to get EDID for
>    * @mgr: manager for this port
> @@ -2283,6 +2314,7 @@ struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_
>   		edid = drm_get_edid(connector, &port->aux.ddc);
>   		drm_mode_connector_set_tile_property(connector);
>   	}
> +	port->has_audio = drm_detect_monitor_audio(edid);
>   	drm_dp_put_port(port);
>   	return edid;
>   }
> @@ -2566,7 +2598,7 @@ static void drm_dp_mst_dump_mstb(struct seq_file *m,
>
>   	seq_printf(m, "%smst: %p, %d\n", prefix, mstb, mstb->num_ports);
>   	list_for_each_entry(port, &mstb->ports, next) {
> -		seq_printf(m, "%sport: %d: ddps: %d ldps: %d, %p, conn: %p\n", prefix, port->port_num, port->ddps, port->ldps, port, port->connector);
> +		seq_printf(m, "%sport: %d: ddps: %d ldps: %d, sdp: %d/%d, %p, conn: %p\n", prefix, port->port_num, port->ddps, port->ldps, port->num_sdp_streams, port->num_sdp_stream_sinks, port, port->connector);
>   		if (port->mstb)
>   			drm_dp_mst_dump_mstb(m, port->mstb);
>   	}
> diff --git a/include/drm/drm_dp_mst_helper.h b/include/drm/drm_dp_mst_helper.h
> index 5340099..74b5888 100644
> --- a/include/drm/drm_dp_mst_helper.h
> +++ b/include/drm/drm_dp_mst_helper.h
> @@ -94,6 +94,7 @@ struct drm_dp_mst_port {
>   	struct drm_dp_mst_topology_mgr *mgr;
>
>   	struct edid *cached_edid; /* for DP logical ports - make tiling work */
> +	bool has_audio;
>   };
>
>   /**
> @@ -215,13 +216,13 @@ struct drm_dp_sideband_msg_rx {
>   	struct drm_dp_sideband_msg_hdr initial_hdr;
>   };
>
> -
> +#define DRM_DP_MAX_SDP_STREAMS 16
>   struct drm_dp_allocate_payload {
>   	u8 port_number;
>   	u8 number_sdp_streams;
>   	u8 vcpi;
>   	u16 pbn;
> -	u8 sdp_stream_sink[8];
> +	u8 sdp_stream_sink[DRM_DP_MAX_SDP_STREAMS];
>   };
>
>   struct drm_dp_allocate_payload_ack_reply {
> @@ -484,6 +485,8 @@ int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handl
>
>   enum drm_connector_status drm_dp_mst_detect_port(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
>
> +bool drm_dp_mst_port_has_audio(struct drm_dp_mst_topology_mgr *mgr,
> +					struct drm_dp_mst_port *port);
>   struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
>
>
>