diff options
| author | Mika Westerberg <mika.westerberg@linux.intel.com> | 2020-08-18 17:10:00 +0300 |
|---|---|---|
| committer | Mika Westerberg <mika.westerberg@linux.intel.com> | 2020-09-03 12:06:40 +0300 |
| commit | edfbd68bb51e3747c91dbafb5ed0e45cba202c21 (patch) | |
| tree | 07707065da2e676cae1c24546e78683aa02c4d7b /drivers/thunderbolt | |
| parent | 49f2a7f4cdaccb21ad964f6d8645ea3a0ec79293 (diff) | |
| download | linux-edfbd68bb51e3747c91dbafb5ed0e45cba202c21.tar.xz | |
thunderbolt: Do not program NFC buffers for USB4 router protocol adapters
USB4 spec says that NFC buffers field is not used for protocol adapters,
only for lane adapters so make tb_port_add_nfc_credits() skip non-lane
adapters in order to follow the spec.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Diffstat (limited to 'drivers/thunderbolt')
| -rw-r--r-- | drivers/thunderbolt/switch.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c index 99effd6be3c1..7ffb3b00b54f 100644 --- a/drivers/thunderbolt/switch.c +++ b/drivers/thunderbolt/switch.c @@ -601,6 +601,13 @@ int tb_port_add_nfc_credits(struct tb_port *port, int credits) if (credits == 0 || port->sw->is_unplugged) return 0; + /* + * USB4 restricts programming NFC buffers to lane adapters only + * so skip other ports. + */ + if (tb_switch_is_usb4(port->sw) && !tb_port_is_null(port)) + return 0; + nfc_credits = port->config.nfc_credits & ADP_CS_4_NFC_BUFFERS_MASK; nfc_credits += credits; |