From: Anssi Hannula <anssi.hann...@bitwise.fi>
Date: Thu, 23 Aug 2018 10:45:22 +0300
> macb_reset_hw() is called from macb_close() and indirectly from
> macb_open(). macb_reset_hw() zeroes the NCR register, including the MPE
> (Management Port Enable) bit.
>
> This will prevent accessing any other PHYs for other Ethernet MACs on
> the MDIO bus, which remains registered at macb_reset_hw() time, until
> macb_init_hw() is called from macb_open() which sets the MPE bit again.
>
> I.e. currently the MDIO bus has a short disruption at open time and is
> disabled at close time until the interface is opened again.
>
> Fix that by only touching the RE and TE bits when enabling and disabling
> RX/TX.
>
> v2: Make macb_init_hw() NCR write a single statement.
>
> Fixes: 6c36a7074436 ("macb: Use generic PHY layer")
> Signed-off-by: Anssi Hannula <anssi.hann...@bitwise.fi>
Applied and queued up for -stable.
