diff options
| -rw-r--r-- | drivers/thunderbolt/sb_regs.h | 2 | ||||
| -rw-r--r-- | drivers/thunderbolt/tb.h | 3 | ||||
| -rw-r--r-- | drivers/thunderbolt/usb4.c | 69 |
3 files changed, 74 insertions, 0 deletions
diff --git a/drivers/thunderbolt/sb_regs.h b/drivers/thunderbolt/sb_regs.h index 9dafd696612f..bda889ff3bda 100644 --- a/drivers/thunderbolt/sb_regs.h +++ b/drivers/thunderbolt/sb_regs.h @@ -17,7 +17,9 @@ enum usb4_sb_opcode { USB4_SB_OPCODE_ERR = 0x20525245, /* "ERR " */ USB4_SB_OPCODE_ONS = 0x444d4321, /* "!CMD" */ + USB4_SB_OPCODE_ROUTER_OFFLINE = 0x4e45534c, /* "LSEN" */ USB4_SB_OPCODE_ENUMERATE_RETIMERS = 0x4d554e45, /* "ENUM" */ + USB4_SB_OPCODE_SET_INBOUND_SBTX = 0x5055534c, /* "LSUP" */ USB4_SB_OPCODE_QUERY_LAST_RETIMER = 0x5453414c, /* "LAST" */ USB4_SB_OPCODE_GET_NVM_SECTOR_SIZE = 0x53534e47, /* "GNSS" */ USB4_SB_OPCODE_NVM_SET_OFFSET = 0x53504f42, /* "BOPS" */ diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h index c5704f495afa..936518adca74 100644 --- a/drivers/thunderbolt/tb.h +++ b/drivers/thunderbolt/tb.h @@ -1062,8 +1062,11 @@ int usb4_port_configure(struct tb_port *port); void usb4_port_unconfigure(struct tb_port *port); int usb4_port_configure_xdomain(struct tb_port *port); void usb4_port_unconfigure_xdomain(struct tb_port *port); +int usb4_port_router_offline(struct tb_port *port); +int usb4_port_router_online(struct tb_port *port); int usb4_port_enumerate_retimers(struct tb_port *port); +int usb4_port_retimer_set_inbound_sbtx(struct tb_port *port, u8 index); int usb4_port_retimer_read(struct tb_port *port, u8 index, u8 reg, void *buf, u8 size); int usb4_port_retimer_write(struct tb_port *port, u8 index, u8 reg, diff --git a/drivers/thunderbolt/usb4.c b/drivers/thunderbolt/usb4.c index 1f82af35328e..8af96dbaa7a7 100644 --- a/drivers/thunderbolt/usb4.c +++ b/drivers/thunderbolt/usb4.c @@ -1318,6 +1318,48 @@ static int usb4_port_sb_op(struct tb_port *port, enum usb4_sb_target target, return -ETIMEDOUT; } +static int usb4_port_set_router_offline(struct tb_port *port, bool offline) +{ + u32 val = !offline; + int ret; + + ret = usb4_port_sb_write(port, USB4_SB_TARGET_ROUTER, 0, + USB4_SB_METADATA, &val, sizeof(val)); + if (ret) + return ret; + + val = USB4_SB_OPCODE_ROUTER_OFFLINE; + return usb4_port_sb_write(port, USB4_SB_TARGET_ROUTER, 0, + USB4_SB_OPCODE, &val, sizeof(val)); +} + +/** + * usb4_port_router_offline() - Put the USB4 port to offline mode + * @port: USB4 port + * + * This function puts the USB4 port into offline mode. In this mode the + * port does not react on hotplug events anymore. This needs to be + * called before retimer access is done when the USB4 links is not up. + * + * Returns %0 in case of success and negative errno if there was an + * error. + */ +int usb4_port_router_offline(struct tb_port *port) +{ + return usb4_port_set_router_offline(port, true); +} + +/** + * usb4_port_router_online() - Put the USB4 port back to online + * @port: USB4 port + * + * Makes the USB4 port functional again. + */ +int usb4_port_router_online(struct tb_port *port) +{ + return usb4_port_set_router_offline(port, false); +} + /** * usb4_port_enumerate_retimers() - Send RT broadcast transaction * @port: USB4 port @@ -1344,6 +1386,33 @@ static inline int usb4_port_retimer_op(struct tb_port *port, u8 index, } /** + * usb4_port_retimer_set_inbound_sbtx() - Enable sideband channel transactions + * @port: USB4 port + * @index: Retimer index + * + * Enables sideband channel transations on SBTX. Can be used when USB4 + * link does not go up, for example if there is no device connected. + */ +int usb4_port_retimer_set_inbound_sbtx(struct tb_port *port, u8 index) +{ + int ret; + + ret = usb4_port_retimer_op(port, index, USB4_SB_OPCODE_SET_INBOUND_SBTX, + 500); + + if (ret != -ENODEV) + return ret; + + /* + * Per the USB4 retimer spec, the retimer is not required to + * send an RT (Retimer Transaction) response for the first + * SET_INBOUND_SBTX command + */ + return usb4_port_retimer_op(port, index, USB4_SB_OPCODE_SET_INBOUND_SBTX, + 500); +} + +/** * usb4_port_retimer_read() - Read from retimer sideband registers * @port: USB4 port * @index: Retimer index |