netdev - Re: i.MX6S/DL and QCA8334 switch using DSA driver

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Date:   Thu, 10 May 2018 16:29:04 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Michal Vokáč <vokac.m@...il.com>
Cc:     netdev@...r.kernel.org,
        Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
        Florian Fainelli <f.fainelli@...il.com>
Subject: Re: i.MX6S/DL and QCA8334 switch using DSA driver - CPU port not
 working

> So both the CPU and the switch are trying to talk to each other but their
> frames are not delivered. This still looks like RGMII configuration problem.

Yes, i would say it is.

> As it works with my old PHY driver I suspect the problem is at the switches
> side somewhere in qca8k_set_pad_ctrl or qca8k_setup in the qca8k driver.
> 
> Any other ideas?

I would probably add code to dump all the qca8k registers. Compare the
values for your working setup and your non-working setup. Hopefully
they are not too different, and you can quickly get to the bits which
matter.

     Andrew