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thunderbolt: Use dedicated flow control for DMA tunnels

Browse source 
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>
This commit is contained in:
Mika Westerberg 2021-01-14 20:27:58 +03:00
parent 46b494f286
commit e5876559b5
1 changed files with 4 additions and 16 deletions
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20
drivers/thunderbolt/tunnel.c
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@ -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;
}