netdev - RE: [PATCH 0/3] net: fec: Reset ethernet PHY whenever the enet

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Date:	Tue, 1 Dec 2015 07:33:04 +0000
From:	Duan Andy <fugang.duan@...escale.com>
To:	Lothar Waßmann <LW@...O-electronics.de>
CC:	Andrew Lunn <andrew@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Fabio Estevam <Fabio.Estevam@...escale.com>,
	Greg Ungerer <gerg@...inux.org>,
	Kevin Hao <haokexin@...il.com>,
	Lucas Stach <l.stach@...gutronix.de>,
	Philippe Reynes <tremyfr@...il.com>,
	Richard Cochran <richardcochran@...il.com>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Stefan Agner <stefan@...er.ch>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Uwe Kleine-K?nig <u.kleine-koenig@...gutronix.de>
Subject: RE: [PATCH 0/3] net: fec: Reset ethernet PHY whenever the enet_out
 clock

From: Lothar Waßmann <LW@...O-electronics.de> Sent: Tuesday, December 01, 2015 3:25 PM
> To: Duan Fugang-B38611
> Cc: Andrew Lunn; David S. Miller; Estevam Fabio-R49496; Greg Ungerer;
> Kevin Hao; Lucas Stach; Philippe Reynes; Richard Cochran; Russell King;
> Sascha Hauer; Stefan Agner; linux-kernel@...r.kernel.org;
> netdev@...r.kernel.org; Jeff Kirsher; Uwe Kleine-K?nig
> Subject: Re: [PATCH 0/3] net: fec: Reset ethernet PHY whenever the
> enet_out clock
> 
> Hi,
> 
> > From: Lothar Waßmann <LW@...O-electronics.de> Sent: Monday, November
> > 30, 2015 7:33 PM
> > > To: Andrew Lunn; David S. Miller; Estevam Fabio-R49496; Greg
> > > Ungerer; Kevin Hao; Lothar Waßmann; Lucas Stach; Duan Fugang-B38611;
> > > Philippe Reynes; Richard Cochran; Russell King; Sascha Hauer; Stefan
> > > Agner; linux- kernel@...r.kernel.org; netdev@...r.kernel.org; Jeff
> > > Kirsher; Uwe Kleine- König
> > > Subject: [PATCH 0/3] net: fec: Reset ethernet PHY whenever the
> > > enet_out clock
> > >
> > > This patchset fixes a regression introduced by commit 8fff755e9f8d
> ("net:
> > > fec: Ensure clocks are enabled while using mdio bus") for ethernet
> > > PHYs that are using ENET_OUT as reference clock (on i.MX6 or i.MX28)
> > >
> > Do you mean commit 8fff755e9f8d cause your problem ?  This commit just
> manage ipg clock in runtime because mdio bus can access external phy
> switch no matter netdev status.
> >
> No. Actually I meant commit e8fcfcd5684a ("net: fec: optimize the clock
> management to save power") which started to disable the clocks when not
> in use.
> 
Understand. Yes, disable enet_out clock for power saving is necessary.

> Sorry for the confusion,
> Lothar Waßmann