On Mon, Jan 04, 2016 at 09:38:08PM -0200, Fabio Estevam wrote:
> From: Fabio Estevam <fabio.este...@nxp.com>
>
> Since commit 59370f3fcd1350 ("net: phy: delay only if reset handler is
> registered") Ethernet is no longer functional:
>
> Booting from net ...
>
> FEC Waiting for PHY auto negotiation to complete......... TIMEOUT !
>
> BOOTP broadcast 1
>
> BOOTP broadcast 2
>
> BOOTP broadcast 3
>
> BOOTP broadcast 4
>
> This commit does not have an issue in itself, but it revelead a problem
> with the Ethernet initialization.
>
> As per the AR8035 datasheet:
>
> "For a reliable power on reset, suggest to keep asserting the reset
> low long enough (10ms) to ensure the clock is stable and clock-to-reset
> 1ms requirement is satisfied."
>
> So do as suggested and keep the reset low for 10ms.
>
> Also add a 100us delay after deasserting the reset line
> to guarantee that the PHY ID can be read correctly and the Atheros
> PHY can be loaded as per Troy Kisky's suggestion.
>
> Signed-off-by: Fabio Estevam <fabio.este...@nxp.com>Repeated my test from V1, still passes (and takes a while for the initial BOOTP reply): Tested-by: Tom Rini <tr...@konsulko.com> -- Tom
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