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thunderbolt: Do not program NFC buffers for USB4 router protocol adapters

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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>
This commit is contained in:
Mika Westerberg 2020-08-18 17:10:00 +03:00
parent 49f2a7f4cd
commit edfbd68bb5
1 changed files with 7 additions and 0 deletions
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7
drivers/thunderbolt/switch.c
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@ -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;