diff options
Diffstat (limited to 'drivers/thunderbolt/usb4.c')
| -rw-r--r-- | drivers/thunderbolt/usb4.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/thunderbolt/usb4.c b/drivers/thunderbolt/usb4.c index ceddbe7e9f93..a95c3e9b88cd 100644 --- a/drivers/thunderbolt/usb4.c +++ b/drivers/thunderbolt/usb4.c @@ -1386,6 +1386,26 @@ int usb4_port_enumerate_retimers(struct tb_port *port) USB4_SB_OPCODE, &val, sizeof(val)); } +/** + * usb4_port_clx_supported() - Check if CLx is supported by the link + * @port: Port to check for CLx support for + * + * PORT_CS_18_CPS bit reflects if the link supports CLx including + * active cables (if connected on the link). + */ +bool usb4_port_clx_supported(struct tb_port *port) +{ + int ret; + u32 val; + + ret = tb_port_read(port, &val, TB_CFG_PORT, + port->cap_usb4 + PORT_CS_18, 1); + if (ret) + return false; + + return !!(val & PORT_CS_18_CPS); +} + static inline int usb4_port_retimer_op(struct tb_port *port, u8 index, enum usb4_sb_opcode opcode, int timeout_msec) |