diff options
Diffstat (limited to 'drivers/thunderbolt/usb4.c')
| -rw-r--r-- | drivers/thunderbolt/usb4.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/thunderbolt/usb4.c b/drivers/thunderbolt/usb4.c index 9f5a98347bee..302d8d3fbd5a 100644 --- a/drivers/thunderbolt/usb4.c +++ b/drivers/thunderbolt/usb4.c @@ -2796,3 +2796,34 @@ int usb4_dp_port_requested_bw(struct tb_port *port) return (val & ADP_DP_CS_8_REQUESTED_BW_MASK) * granularity; } + +/** + * usb4_pci_port_set_ext_encapsulation() - Enable/disable extended encapsulation + * @port: PCIe adapter + * @enable: Enable/disable extended encapsulation + * + * Enables or disables extended encapsulation used in PCIe tunneling. Caller + * needs to make sure both adapters support this before enabling. Returns %0 on + * success and negative errno otherwise. + */ +int usb4_pci_port_set_ext_encapsulation(struct tb_port *port, bool enable) +{ + u32 val; + int ret; + + if (!tb_port_is_pcie_up(port) && !tb_port_is_pcie_down(port)) + return -EINVAL; + + ret = tb_port_read(port, &val, TB_CFG_PORT, + port->cap_adap + ADP_PCIE_CS_1, 1); + if (ret) + return ret; + + if (enable) + val |= ADP_PCIE_CS_1_EE; + else + val &= ~ADP_PCIE_CS_1_EE; + + return tb_port_write(port, &val, TB_CFG_PORT, + port->cap_adap + ADP_PCIE_CS_1, 1); +} |