thunderbolt: Use dedicated flow control for DMA tunnels

The USB4 inter-domain service spec recommends using dedicated flow
control scheme so update the driver accordingly.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

diff --git a/drivers/thunderbolt/tunnel.c b/drivers/thunderbolt/tunnel.c
index 6557b6e..2e7ec03 100644 (file)
--- a/drivers/thunderbolt/tunnel.c
+++ b/drivers/thunderbolt/tunnel.c
@@ -794,24 +794,14 @@ static u32 tb_dma_credits(struct tb_port *nhi)
        return min(max_credits, 13U);
 }
 
-static int tb_dma_activate(struct tb_tunnel *tunnel, bool active)
-{
-       struct tb_port *nhi = tunnel->src_port;
-       u32 credits;
-
-       credits = active ? tb_dma_credits(nhi) : 0;
-       return tb_port_set_initial_credits(nhi, credits);
-}
-
-static void tb_dma_init_path(struct tb_path *path, unsigned int isb,
-                            unsigned int efc, u32 credits)
+static void tb_dma_init_path(struct tb_path *path, unsigned int efc, u32 credits)
 {
        int i;
 
        path->egress_fc_enable = efc;
        path->ingress_fc_enable = TB_PATH_ALL;
        path->egress_shared_buffer = TB_PATH_NONE;
-       path->ingress_shared_buffer = isb;
+       path->ingress_shared_buffer = TB_PATH_NONE;
        path->priority = 5;
        path->weight = 1;
        path->clear_fc = true;
@@ -856,7 +846,6 @@ struct tb_tunnel *tb_tunnel_alloc_dma(struct tb *tb, struct tb_port *nhi,
        if (!tunnel)
                return NULL;
 
-       tunnel->activate = tb_dma_activate;
        tunnel->src_port = nhi;
        tunnel->dst_port = dst;
 
@@ -869,8 +858,7 @@ struct tb_tunnel *tb_tunnel_alloc_dma(struct tb *tb, struct tb_port *nhi,
                        tb_tunnel_free(tunnel);
                        return NULL;
                }
-               tb_dma_init_path(path, TB_PATH_NONE, TB_PATH_SOURCE | TB_PATH_INTERNAL,
-                                credits);
+               tb_dma_init_path(path, TB_PATH_SOURCE | TB_PATH_INTERNAL, credits);
                tunnel->paths[i++] = path;
        }
 
@@ -881,7 +869,7 @@ struct tb_tunnel *tb_tunnel_alloc_dma(struct tb *tb, struct tb_port *nhi,
                        tb_tunnel_free(tunnel);
                        return NULL;
                }
-               tb_dma_init_path(path, TB_PATH_SOURCE, TB_PATH_ALL, credits);
+               tb_dma_init_path(path, TB_PATH_ALL, credits);
                tunnel->paths[i++] = path;
        }