diff options
Diffstat (limited to 'drivers/thunderbolt/switch.c')
| -rw-r--r-- | drivers/thunderbolt/switch.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c index d6c32e1e2b42..667413f3ad7a 100644 --- a/drivers/thunderbolt/switch.c +++ b/drivers/thunderbolt/switch.c @@ -139,6 +139,40 @@ int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged) } /** + * tb_port_add_nfc_credits() - add/remove non flow controlled credits to port + * + * Change the number of NFC credits allocated to @port by @credits. To remove + * NFC credits pass a negative amount of credits. + * + * Return: Returns 0 on success or an error code on failure. + */ +int tb_port_add_nfc_credits(struct tb_port *port, int credits) +{ + if (credits == 0) + return 0; + tb_port_info(port, + "adding %#x NFC credits (%#x -> %#x)", + credits, + port->config.nfc_credits, + port->config.nfc_credits + credits); + port->config.nfc_credits += credits; + return tb_port_write(port, &port->config.nfc_credits, + TB_CFG_PORT, 4, 1); +} + +/** + * tb_port_clear_counter() - clear a counter in TB_CFG_COUNTER + * + * Return: Returns 0 on success or an error code on failure. + */ +int tb_port_clear_counter(struct tb_port *port, int counter) +{ + u32 zero[3] = { 0, 0, 0 }; + tb_port_info(port, "clearing counter %d\n", counter); + return tb_port_write(port, zero, TB_CFG_COUNTERS, 3 * counter, 3); +} + +/** * tb_init_port() - initialize a port * * This is a helper method for tb_switch_alloc. Does not check or initialize |