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Date: Tue, 1 Dec 2015 01:52:35 +0000 From: Duan Andy <fugang.duan@...escale.com> To: Lothar Waßmann <LW@...O-electronics.de>, 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: 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. I don't think the commit cause phy link up/down issue. Phy link up/down is due to phy is not ready after power/clock on, it need to do reset. > The first patch is a cleanup patch that removes redundant NULL checks. > The second patch converts the driver to use the 'gpiod' framework. > The third patch makes sure, fec_reset_phy() is called whenever the > enet_out clock has been (re-)enabled to get the PHY into a > consistent state.
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