linux-kernel - Re: [PATCH RFC v1 0/7] net: phy: Ethernet PHY powerdown optimization

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Message-Id: <20131120.171525.1584609970007162599.davem@davemloft.net>
Date:	Wed, 20 Nov 2013 17:15:25 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	sebastian.hesselbarth@...il.com
Cc:	netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC v1 0/7] net: phy: Ethernet PHY powerdown
 optimization

From: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Date: Wed, 20 Nov 2013 21:54:19 +0100

> Right, as far as I understand BMCR powerdown, i.e. what is called in
> genphy_suspend/resume, powers down the PHY but _does_ retain PHY
> config.
> It is not resetting the device.
> 
> I haven't checked a lot of datasheets but [1] notes that "registers
> will
> preserve their configuration". Even if we have PHYs that do not
> preserve
> it, they should have a device specific callback for suspend/resume
> that
> takes care of preserving it.
> 
> [1] http://www.ti.com/lit/an/snoa463a/snoa463a.pdf

Thanks, that addresses my concerns.
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