From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kumar Gala Subject: [PATCH] gianfar: ensure ECNTRL[R100] is cleared on link state change Date: Tue, 6 Jan 2009 14:52:51 -0600 Message-ID: <1231275171-21388-1-git-send-email-galak@kernel.crashing.org> Cc: linuxppc-dev@ozlabs.org, afleming@freescale.com, davem@davemloft.net, Leo Li To: netdev@vger.kernel.org Return-path: Received: from gate.crashing.org ([63.228.1.57]:46067 "EHLO gate.crashing.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751390AbZAFUzG (ORCPT ); Tue, 6 Jan 2009 15:55:06 -0500 Sender: netdev-owner@vger.kernel.org List-ID: From: Leo Li When changing the link between 100Mbps and 1Gbps in SGMII mode it was found out that the link would stop working. The issue is that ECNTRL[R100] needs to be cleared when in 1Gbps mode. Older reference manuals didn't require the explicitly clearing but has since been found it that it is needed. Signed-off-by: Li Yang Signed-off-by: Kumar Gala --- Dave, Please apply for 2.6.29 as it addresses a "HW" bug in real systems. thanks - k drivers/net/gianfar.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-) diff --git a/drivers/net/gianfar.c b/drivers/net/gianfar.c index c672ecf..7fcc3af 100644 --- a/drivers/net/gianfar.c +++ b/drivers/net/gianfar.c @@ -1973,6 +1973,8 @@ static void adjust_link(struct net_device *dev) case 1000: tempval = ((tempval & ~(MACCFG2_IF)) | MACCFG2_GMII); + + ecntrl &= ~(ECNTRL_R100); break; case 100: case 10: -- 1.5.6.5