diff options
| author | Egil Hjelmeland <privat@egil-hjelmeland.no> | 2017-10-24 17:14:10 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-10-26 17:40:32 +0900 |
| commit | 3c91b0c1de8d013490bbc41ce9ee8810ea5baddd (patch) | |
| tree | 837720e8983191cdd9b9804988a3d26061c72cbb /drivers/net/dsa | |
| parent | acfdf7eabea4186a386ba5e656f0c739563cb1a5 (diff) | |
| download | linux-3c91b0c1de8d013490bbc41ce9ee8810ea5baddd.tar.bz2 | |
net: dsa: lan9303: Do not disable switch fabric port 0 at .probe
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 <privat@egil-hjelmeland.no>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/dsa')
| -rw-r--r-- | drivers/net/dsa/lan9303-core.c | 2 |
1 files changed, 1 insertions, 1 deletions
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) |