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Date: Mon, 30 Nov 2015 07:56:17 +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>, Kevin Hao <haokexin@...il.com>, Lucas Stach <l.stach@...gutronix.de>, Philippe Reynes <tremyfr@...il.com>, Russell King <rmk+kernel@....linux.org.uk>, Uwe Kleine-K?nig <u.kleine-koenig@...gutronix.de>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>, Stefan Agner <stefan@...er.ch> Subject: Re: [PATCH] net: fec: fix enet_out clock handling Hi, > From: Lothar Waßmann <LW@...O-electronics.de> Sent: Friday, November 27, 2015 9:39 PM > > To: Andrew Lunn; David S. Miller; Estevam Fabio-R49496; Kevin Hao; Lothar > > Waßmann; Lucas Stach; Duan Fugang-B38611; Philippe Reynes; Russell King; > > Uwe Kleine-König; linux-kernel@...r.kernel.org; netdev@...r.kernel.org; > > Stefan Agner > > Subject: [PATCH] net: fec: fix enet_out clock handling > > > > When ENET_OUT is being used as reference clock for an external PHY, the > > clock must not be disabled while the PHY is active. Otherwise the PHY may > > lose its internal state and require a reset to become functional again. > > > > A symptom for this bug is a network interface that constantly toggles > > between UP and DOWN state: > > fec 800f0000.ethernet eth0: Link is Up - 100Mbps/Full - flow control > > rx/tx fec 800f0000.ethernet eth0: Link is Down fec 800f0000.ethernet eth0: > > Link is Up - 100Mbps/Full - flow control rx/tx fec 800f0000.ethernet eth0: > > Link is Down [...] > > > > Signed-off-by: Lothar Waßmann <LW@...O-electronics.de> > > --- > > drivers/net/ethernet/freescale/fec_main.c | 34 +++++++++++++------------ > > ------ > > 1 file changed, 14 insertions(+), 20 deletions(-) > > > > When MAC is not ready with clocks disabled, it is not necessary to supply clock for PHY. In fact, PHY also is not ready, why does it need clock ? > For your problem, you must add PHY reset in your dts file to resolve your problem. > The phy-reset-gpio property is set in the DTB. But fec_reset_phy() which asserts the RESET is only called from within the probe() function. It should probably be called from fec_restart() instead? Lothar Waßmann -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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