netdev - Re: [PATCH v2] net: macb: do not disable MDIO bus at open/close time

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Date:   Sat, 25 Aug 2018 17:35:21 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     anssi.hannula@...wise.fi
Cc:     netdev@...r.kernel.org, nicolas.ferre@...rochip.com,
        Claudiu.Beznea@...rochip.com, andrew@...n.ch
Subject: Re: [PATCH v2] net: macb: do not disable MDIO bus at open/close
 time

From: Anssi Hannula <anssi.hannula@...wise.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.hannula@...wise.fi>

Applied and queued up for -stable.