diff options
| -rw-r--r-- | drivers/thunderbolt/clx.c | 2 | ||||
| -rw-r--r-- | drivers/thunderbolt/tb.c | 62 |
2 files changed, 58 insertions, 6 deletions
diff --git a/drivers/thunderbolt/clx.c b/drivers/thunderbolt/clx.c index 4f0cfbb24dd9..604cceb23659 100644 --- a/drivers/thunderbolt/clx.c +++ b/drivers/thunderbolt/clx.c @@ -317,7 +317,7 @@ int tb_switch_clx_enable(struct tb_switch *sw, unsigned int clx) struct tb_port *up, *down; int ret; - if (!clx) + if (!clx || sw->clx == clx) return 0; if (!validate_mask(clx)) diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c index 1d056ff6d77f..aa6e11589c28 100644 --- a/drivers/thunderbolt/tb.c +++ b/drivers/thunderbolt/tb.c @@ -240,8 +240,11 @@ static void tb_discover_dp_resources(struct tb *tb) } } +/* Enables CL states up to host router */ static int tb_enable_clx(struct tb_switch *sw) { + struct tb_cm *tcm = tb_priv(sw->tb); + const struct tb_tunnel *tunnel; int ret; /* @@ -251,10 +254,27 @@ static int tb_enable_clx(struct tb_switch *sw) * this in the future to cover the whole topology if it turns * out to be beneficial. */ + while (sw && sw->config.depth > 1) + sw = tb_switch_parent(sw); + + if (!sw) + return 0; + if (sw->config.depth != 1) return 0; /* + * If we are re-enabling then check if there is an active DMA + * tunnel and in that case bail out. + */ + list_for_each_entry(tunnel, &tcm->tunnel_list, list) { + if (tb_tunnel_is_dma(tunnel)) { + if (tb_tunnel_port_on_path(tunnel, tb_upstream_port(sw))) + return 0; + } + } + + /* * CL0s and CL1 are enabled and supported together. * Silently ignore CLx enabling in case CLx is not supported. */ @@ -262,6 +282,16 @@ static int tb_enable_clx(struct tb_switch *sw) return ret == -EOPNOTSUPP ? 0 : ret; } +/* Disables CL states up to the host router */ +static void tb_disable_clx(struct tb_switch *sw) +{ + do { + if (tb_switch_clx_disable(sw) < 0) + tb_sw_warn(sw, "failed to disable CL states\n"); + sw = tb_switch_parent(sw); + } while (sw); +} + static int tb_increase_switch_tmu_accuracy(struct device *dev, void *data) { struct tb_switch *sw; @@ -1470,30 +1500,45 @@ static int tb_approve_xdomain_paths(struct tb *tb, struct tb_xdomain *xd, struct tb_port *nhi_port, *dst_port; struct tb_tunnel *tunnel; struct tb_switch *sw; + int ret; sw = tb_to_switch(xd->dev.parent); dst_port = tb_port_at(xd->route, sw); nhi_port = tb_switch_find_port(tb->root_switch, TB_TYPE_NHI); mutex_lock(&tb->lock); + + /* + * When tunneling DMA paths the link should not enter CL states + * so disable them now. + */ + tb_disable_clx(sw); + tunnel = tb_tunnel_alloc_dma(tb, nhi_port, dst_port, transmit_path, transmit_ring, receive_path, receive_ring); if (!tunnel) { - mutex_unlock(&tb->lock); - return -ENOMEM; + ret = -ENOMEM; + goto err_clx; } if (tb_tunnel_activate(tunnel)) { tb_port_info(nhi_port, "DMA tunnel activation failed, aborting\n"); - tb_tunnel_free(tunnel); - mutex_unlock(&tb->lock); - return -EIO; + ret = -EIO; + goto err_free; } list_add_tail(&tunnel->list, &tcm->tunnel_list); mutex_unlock(&tb->lock); return 0; + +err_free: + tb_tunnel_free(tunnel); +err_clx: + tb_enable_clx(sw); + mutex_unlock(&tb->lock); + + return ret; } static void __tb_disconnect_xdomain_paths(struct tb *tb, struct tb_xdomain *xd, @@ -1519,6 +1564,13 @@ static void __tb_disconnect_xdomain_paths(struct tb *tb, struct tb_xdomain *xd, receive_path, receive_ring)) tb_deactivate_and_free_tunnel(tunnel); } + + /* + * Try to re-enable CL states now, it is OK if this fails + * because we may still have another DMA tunnel active through + * the same host router USB4 downstream port. + */ + tb_enable_clx(sw); } static int tb_disconnect_xdomain_paths(struct tb *tb, struct tb_xdomain *xd, |