Make the LAN9303 work when lan9303_probe() is called twice.
For some unknown reason the LAN9303 switch fail to forward data when switch
fabric port 0 TX is disabled during probe. (Write of LAN9303_MAC_TX_CFG_0
in lan9303_disable_processing_port().)
In that situation the switch fabric seem to receive frames, because the ALR
is learning addresses. But no frames are transmitted on any of the ports.
In our system lan9303_probe() is called twice, first time
dsa_register_switch() return -EPROBE_DEFER. As an experiment, modified the
code to skip writing LAN9303_MAC_TX_CFG_0, port 0 during the first probe.
Then the switch works as expected.
Resolve the problem by not calling lan9303_disable_processing_port() on
port 0 during probe. Ports 1 and 2 are still disabled.
Although unsatisfying that the exact failure mechanism is not known,
the patch should not cause any harm.
Signed-off-by: Egil Hjelmeland <pri...@egil-hjelmeland.no>
---
drivers/net/dsa/lan9303-core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/dsa/lan9303-core.c b/drivers/net/dsa/lan9303-core.c
index 87f919f0e641..4c412bd52319 100644
--- a/drivers/net/dsa/lan9303-core.c
+++ b/drivers/net/dsa/lan9303-core.c
@@ -818,7 +818,7 @@ static int lan9303_disable_processing(struct lan9303 *chip)
{
int p;
- for (p = 0; p < LAN9303_NUM_PORTS; p++) {
+ for (p = 1; p < LAN9303_NUM_PORTS; p++) {
int ret = lan9303_disable_processing_port(chip, p);
if (ret)
--
2.11.0
