Commit e5876559 authored by Mika Westerberg's avatar Mika Westerberg
Browse files

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: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
parent 46b494f2

drivers/thunderbolt/tunnel.c

+4 −16
Original line number Diff line number Diff line
@@ -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;

	}