dp/mst: add SDP stream support

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@gmail.com>
Signed-off-by: Libin Yang <libin.yang@linux.intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1449036584-105393-1-git-send-email-libin.yang@linux.intel.com

diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
index 809959d56d7826364b540204a16190aaf270f9c4..f50eb7b87c2f6a22f4da539b08413a831399f6fb 100644 (file)
--- 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);
 
@@ -2258,6 +2268,27 @@ 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
@@ -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 5340099741aec8c48575b1c1056f23903e150ed6..74b5888bbc73e02950fbd64794633d4c6d1f24ff 100644 (file)
--- 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);