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thunderbolt: Update port credits after bonding is enabled/disabled 

Once lane bonding has been enabled (or disabled) both lane adapters may
update their total credits accordingly. For this reason re-read the port
credits after lane bonding has been enabled or disabled.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
This commit is contained in:
Mika Westerberg 2021-03-22 17:01:59 +02:00
parent 56ad3aef5c
commit 69fea377e6
3 changed files with 51 additions and 0 deletions
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48
drivers/thunderbolt/switch.c
View File

@ -1099,6 +1099,49 @@ int tb_port_wait_for_link_width(struct tb_port *port, int width,
return -ETIMEDOUT;
}
static int tb_port_do_update_credits(struct tb_port *port)
{
u32 nfc_credits;
int ret;
ret = tb_port_read(port, &nfc_credits, TB_CFG_PORT, ADP_CS_4, 1);
if (ret)
return ret;
if (nfc_credits != port->config.nfc_credits) {
u32 total;
total = (nfc_credits & ADP_CS_4_TOTAL_BUFFERS_MASK) >>
ADP_CS_4_TOTAL_BUFFERS_SHIFT;
tb_port_dbg(port, "total credits changed %u -> %u\n",
port->total_credits, total);
port->config.nfc_credits = nfc_credits;
port->total_credits = total;
}
return 0;
}
/**
* tb_port_update_credits() - Re-read port total credits
* @port: Port to update
*
* After the link is bonded (or bonding was disabled) the port total
* credits may change, so this function needs to be called to re-read
* the credits. Updates also the second lane adapter.
*/
int tb_port_update_credits(struct tb_port *port)
{
int ret;
ret = tb_port_do_update_credits(port);
if (ret)
return ret;
return tb_port_do_update_credits(port->dual_link_port);
}
static int tb_port_start_lane_initialization(struct tb_port *port)
{
int ret;
@ -2494,6 +2537,8 @@ int tb_switch_lane_bonding_enable(struct tb_switch *sw)
return ret;
}
tb_port_update_credits(down);
tb_port_update_credits(up);
tb_switch_update_link_attributes(sw);
tb_sw_dbg(sw, "lane bonding enabled\n");
@ -2531,7 +2576,10 @@ void tb_switch_lane_bonding_disable(struct tb_switch *sw)
if (tb_port_wait_for_link_width(down, 1, 100) == -ETIMEDOUT)
tb_sw_warn(sw, "timeout disabling lane bonding\n");
tb_port_update_credits(down);
tb_port_update_credits(up);
tb_switch_update_link_attributes(sw);
tb_sw_dbg(sw, "lane bonding disabled\n");
}

1
drivers/thunderbolt/tb.h
View File

@ -906,6 +906,7 @@ int tb_port_lane_bonding_enable(struct tb_port *port);
void tb_port_lane_bonding_disable(struct tb_port *port);
int tb_port_wait_for_link_width(struct tb_port *port, int width,
int timeout_msec);
int tb_port_update_credits(struct tb_port *port);
int tb_switch_find_vse_cap(struct tb_switch *sw, enum tb_switch_vse_cap vsec);
int tb_switch_find_cap(struct tb_switch *sw, enum tb_switch_cap cap);

2
drivers/thunderbolt/xdomain.c
View File

@ -1533,6 +1533,7 @@ int tb_xdomain_lane_bonding_enable(struct tb_xdomain *xd)
return ret;
}
tb_port_update_credits(port);
tb_xdomain_update_link_attributes(xd);
dev_dbg(&xd->dev, "lane bonding enabled\n");
@ -1557,6 +1558,7 @@ void tb_xdomain_lane_bonding_disable(struct tb_xdomain *xd)
if (tb_port_wait_for_link_width(port, 1, 100) == -ETIMEDOUT)
tb_port_warn(port, "timeout disabling lane bonding\n");
tb_port_disable(port->dual_link_port);
tb_port_update_credits(port);
tb_xdomain_update_link_attributes(xd);
dev_dbg(&xd->dev, "lane bonding disabled\n");