linux-kernel - Re: [PATCH 0/3] net: fec: Reset ethernet PHY whenever the enet

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Date:	Tue, 1 Dec 2015 08:24:50 +0100
From:	Lothar Waßmann <LW@...O-electronics.de>
To:	Duan Andy <fugang.duan@...escale.com>
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

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.

Sorry for the confusion,
Lothar Waßmann
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