diff options
Diffstat (limited to 'drivers/thunderbolt/usb4.c')
| -rw-r--r-- | drivers/thunderbolt/usb4.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/thunderbolt/usb4.c b/drivers/thunderbolt/usb4.c index d952de07493f..4d83b65afb5b 100644 --- a/drivers/thunderbolt/usb4.c +++ b/drivers/thunderbolt/usb4.c @@ -1831,6 +1831,30 @@ int usb4_port_retimer_is_last(struct tb_port *port, u8 index) } /** + * usb4_port_retimer_is_cable() - Is the retimer cable retimer + * @port: USB4 port + * @index: Retimer index + * + * If the retimer at @index is last cable retimer this function returns + * %1 and %0 if it is on-board retimer. In case a retimer is not present + * at @index returns %-ENODEV. Otherwise returns negative errno. + */ +int usb4_port_retimer_is_cable(struct tb_port *port, u8 index) +{ + u32 metadata; + int ret; + + ret = usb4_port_retimer_op(port, index, USB4_SB_OPCODE_QUERY_CABLE_RETIMER, + 500); + if (ret) + return ret; + + ret = usb4_port_sb_read(port, USB4_SB_TARGET_RETIMER, index, + USB4_SB_METADATA, &metadata, sizeof(metadata)); + return ret ? ret : metadata & 1; +} + +/** * usb4_port_retimer_nvm_sector_size() - Read retimer NVM sector size * @port: USB4 port * @index: Retimer index |