[PATCH v2 0/7] stmmac: dwmac-meson8b: configurable RGMII TX delay

David Laight David.Laight at ACULAB.COM
Fri Nov 25 05:41:02 PST 2016

From: Martin Blumenstingl
> Sent: 25 November 2016 13:02
> Currently the dwmac-meson8b stmmac glue driver uses a hardcoded 1/4
> cycle TX clock delay. This seems to work fine for many boards (for
> example Odroid-C2 or Amlogic's reference boards) but there are some
> others where TX traffic is simply broken.
> There are probably multiple reasons why it's working on some boards
> while it's broken on others:
> - some of Amlogic's reference boards are using a Micrel PHY
> - hardware circuit design
> - maybe more...

Interesting thought.
Can you test phy loopback with different delays?
It might be then possible to default to 'auto'.


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