From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EEAF415AD5 for ; Tue, 25 Jul 2023 09:58:49 +0000 (UTC) Received: from pandora.armlinux.org.uk (pandora.armlinux.org.uk [IPv6:2001:4d48:ad52:32c8:5054:ff:fe00:142]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3B9251BCC for ; Tue, 25 Jul 2023 02:58:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=armlinux.org.uk; s=pandora-2019; h=Sender:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=oaoymqNN5F7RKeVZED25akK7U0MsO2FW6J7h4go8q30=; b=GK/7KDJzg8bMRSwKPqk12BNc+n QWEuDiyAf+9w3LtiT5cUp2zotO1SzUWlz/CqSZ0vekCWtcQzik3VKDbe831ZzNkwmrpv+Nh3C2Rkn o3RJpfkB791XJEuANmk5i5kqQMMRS69xlYXORKxjegHsFC+W6F4Qa1OnLeoAEZ367O/gnU+mFaPqo XeMrwRkafZDO37n66SgdnhFxQTnZ11O78WrzIlwHg1iKsLAfxjm6+EAwTH9z5yi620A+CW1TU5iyn sQQ63rjKtpvvmp+zD0A6Ax34SGazTSqxqarJzHSPeoPqOpkm2FplRB91lJiKDn8OOBZ2jEupb5BZh r+HlFtpQ==; Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:56326) by pandora.armlinux.org.uk with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1qOEoE-0001rq-0s; Tue, 25 Jul 2023 10:58:26 +0100 Received: from linux by shell.armlinux.org.uk with local (Exim 4.94.2) (envelope-from ) id 1qOEoD-0001j0-5e; Tue, 25 Jul 2023 10:58:25 +0100 Date: Tue, 25 Jul 2023 10:58:25 +0100 From: "Russell King (Oracle)" To: Jiawen Wu Cc: netdev@vger.kernel.org, andrew@lunn.ch, hkallweit1@gmail.com, Jose.Abreu@synopsys.com, mengyuanlou@net-swift.com Subject: Re: [PATCH net-next 4/7] net: pcs: xpcs: adapt Wangxun NICs for SGMII mode Message-ID: References: <20230724102341.10401-1-jiawenwu@trustnetic.com> <20230724102341.10401-5-jiawenwu@trustnetic.com> <03cc01d9be9c$6e51cad0$4af56070$@trustnetic.com> <03f101d9bedd$763b06d0$62b11470$@trustnetic.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <03f101d9bedd$763b06d0$62b11470$@trustnetic.com> Sender: Russell King (Oracle) X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED,SPF_HELO_NONE, SPF_NONE,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net On Tue, Jul 25, 2023 at 05:50:36PM +0800, Jiawen Wu wrote: > On Tuesday, July 25, 2023 3:49 PM, Russell King (Oracle) wrote: > > On Tue, Jul 25, 2023 at 10:05:05AM +0800, Jiawen Wu wrote: > > > On Monday, July 24, 2023 6:35 PM, Russell King (Oracle) wrote: > > > > On Mon, Jul 24, 2023 at 06:23:38PM +0800, Jiawen Wu wrote: > > > > > Wangxun NICs support the connection with SFP to RJ45 module. In this case, > > > > > PCS need to be configured in SGMII mode. > > > > > > > > > > Accroding to chapter 6.11.1 "SGMII Auto-Negitiation" of DesignWare Cores > > > > > Ethernet PCS (version 3.20a) and custom design manual, do the following > > > > > configuration when the interface mode is SGMII. > > > > > > > > > > 1. program VR_MII_AN_CTRL bit(3) [TX_CONFIG] = 1b (PHY side SGMII) > > > > > 2. program VR_MII_AN_CTRL bit(8) [MII_CTRL] = 1b (8-bit MII) > > > > > 3. program VR_MII_DIG_CTRL1 bit(0) [PHY_MODE_CTRL] = 1b > > > > > > > > I'm confused by "PHY side SGMII" - what does this mean for the > > > > transmitted 16-bit configuration word? Does it mean that _this_ side > > > > is acting as if it were a PHY? > > > > > > I'm not sure, because the datasheet doesn't explicitly describe it. In this > > > case, the PHY is integrated in the SFP to RJ45 module. From my point of > > > view, TX control occurs on the PHY side. So program it as PHY side SGMII. > > > > Let me ask the question a different way. Would you use "PHY side SGMII" > > if the PHY was directly connected to the PCS with SGMII? > > The information obtained from the IC designer is that "PHY/MAC side SGMII" > is configured by experimentation. For these different kinds of NICs: > 1) fiber + SFP-RJ45 module: PHY side SGMII > 2) copper (pcs + external PHY): MAC side SGMII This makes no sense. a PHY on a RJ45 SFP module is just the same as a PHY integrated into a board with the MAC. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!