From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Miller Subject: Re: [PATCH net-next] net: mvneta: Add support for 2500Mbps SGMII Date: Wed, 26 Sep 2018 20:27:35 -0700 (PDT) Message-ID: <20180926.202735.1750846894178423857.davem@davemloft.net> References: <20180925135939.4816-1-maxime.chevallier@bootlin.com> Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, antoine.tenart@bootlin.com, thomas.petazzoni@bootlin.com, gregory.clement@bootlin.com, miquel.raynal@bootlin.com, nadavh@marvell.com, stefanc@marvell.com, mw@semihalf.com, yelena@marvell.com, linux-arm-kernel@lists.infradead.org To: maxime.chevallier@bootlin.com Return-path: In-Reply-To: <20180925135939.4816-1-maxime.chevallier@bootlin.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org From: Maxime Chevallier Date: Tue, 25 Sep 2018 15:59:39 +0200 > The mvneta controller can handle speeds up to 2500Mbps on the SGMII > interface. This relies on serdes configuration, the lane must be > configured at 3.125Gbps and we can't use in-band autoneg at that speed. > > The main issue when supporting that speed on this particular controller > is that the link partner can send ethernet frames with a shortened > preamble, which if not explicitly enabled in the controller will cause > unexpected behaviours. > > This was tested on Armada 385, with the comphy configuration done in > bootloader. > > Signed-off-by: Maxime Chevallier Applied.