From: Egil Hjelmeland <pri...@egil-hjelmeland.no> Date: Tue, 24 Oct 2017 17:14:10 +0200
> 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> Applied.
