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thunderbolt: Rework NFC credits handling

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NFC (non flow control) credits is actually 20-bit field so update
tb_port_add_nfc_credits() to handle this properly. This allows us to set
NFC credits for Display Port path in subsequent patches.

Also make sure the function does not update the hardware if the
underlying switch is already unplugged.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
This commit is contained in:
Mika Westerberg
2018-10-11 11:38:22 +03:00
parent e78db6f08b
commit c5ee6feb34
2 changed files with 16 additions and 7 deletions
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20
drivers/thunderbolt/switch.c
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@@ -537,14 +537,20 @@ int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged)
*/
int tb_port_add_nfc_credits(struct tb_port *port, int credits)
{
if (credits == 0)
u32 nfc_credits;
if (credits == 0 || port->sw->is_unplugged)
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;
nfc_credits = port->config.nfc_credits & TB_PORT_NFC_CREDITS_MASK;
nfc_credits += credits;
tb_port_dbg(port, "adding %d NFC credits to %lu",
credits, port->config.nfc_credits & TB_PORT_NFC_CREDITS_MASK);
port->config.nfc_credits &= ~TB_PORT_NFC_CREDITS_MASK;
port->config.nfc_credits |= nfc_credits;
return tb_port_write(port, &port->config.nfc_credits,
TB_CFG_PORT, 4, 1);
}