diff options
Diffstat (limited to 'drivers/thunderbolt/lc.c')
| -rw-r--r-- | drivers/thunderbolt/lc.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/thunderbolt/lc.c b/drivers/thunderbolt/lc.c index c178f0d7beab..53495a38b4eb 100644 --- a/drivers/thunderbolt/lc.c +++ b/drivers/thunderbolt/lc.c @@ -193,6 +193,30 @@ int tb_lc_start_lane_initialization(struct tb_port *port) return tb_sw_write(sw, &ctrl, TB_CFG_SWITCH, cap + TB_LC_SX_CTRL, 1); } +/** + * tb_lc_is_clx_supported() - Check whether CLx is supported by the lane adapter + * @port: Lane adapter + * + * TB_LC_LINK_ATTR_CPS bit reflects if the link supports CLx including + * active cables (if connected on the link). + */ +bool tb_lc_is_clx_supported(struct tb_port *port) +{ + struct tb_switch *sw = port->sw; + int cap, ret; + u32 val; + + cap = find_port_lc_cap(port); + if (cap < 0) + return false; + + ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, cap + TB_LC_LINK_ATTR, 1); + if (ret) + return false; + + return !!(val & TB_LC_LINK_ATTR_CPS); +} + static int tb_lc_set_wake_one(struct tb_switch *sw, unsigned int offset, unsigned int flags) { |