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thunderbolt: Add dummy read after port capability list walk on Light Ridge

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Light Ridge has an issue where reading the next capability pointer
location in port config space the read data is not cleared. It is fine
to read capabilities each after another so only thing we need to do is
to make sure we issue dummy read after tb_port_find_cap() is finished to
avoid the issue in next read.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
This commit is contained in:
Mika Westerberg 2019-01-08 19:08:06 +02:00
parent 8b0110d9d1
commit ffd003b2f8
1 changed files with 16 additions and 0 deletions
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16
drivers/thunderbolt/cap.c
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@ -52,6 +52,21 @@ static int tb_port_enable_tmu(struct tb_port *port, bool enable)
return tb_sw_write(sw, &value, TB_CFG_SWITCH, offset, 1);
}
static void tb_port_dummy_read(struct tb_port *port)
{
/*
* When reading from next capability pointer location in port
* config space the read data is not cleared on LR. To avoid
* reading stale data on next read perform one dummy read after
* port capabilities are walked.
*/
if (tb_switch_is_lr(port->sw)) {
u32 dummy;
tb_port_read(port, &dummy, TB_CFG_PORT, 0, 1);
}
}
static int __tb_port_find_cap(struct tb_port *port, enum tb_port_cap cap)
{
u32 offset = 1;
@ -92,6 +107,7 @@ int tb_port_find_cap(struct tb_port *port, enum tb_port_cap cap)
ret = __tb_port_find_cap(port, cap);
tb_port_dummy_read(port);
tb_port_enable_tmu(port, false);
return ret;