From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 466D1C47082 for ; Tue, 8 Jun 2021 12:21:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2EBB761073 for ; Tue, 8 Jun 2021 12:21:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232570AbhFHMXT (ORCPT ); Tue, 8 Jun 2021 08:23:19 -0400 Received: from vps0.lunn.ch ([185.16.172.187]:51480 "EHLO vps0.lunn.ch" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232316AbhFHMXR (ORCPT ); Tue, 8 Jun 2021 08:23:17 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lunn.ch; s=20171124; h=In-Reply-To:Content-Disposition:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:From:Sender:Reply-To:Subject: Date:Message-ID:To:Cc:MIME-Version:Content-Type:Content-Transfer-Encoding: Content-ID:Content-Description:Content-Disposition:In-Reply-To:References; bh=Q358deKO0MihPyIqvyu38upjUiXQjkj1FqyY/WxW6nI=; b=cMloeQTcBpRPBKzrnmZVTDQgaH qWorJTk3VV5bV/smsCzdneITpX/oUu3Lrmf5xWVj+UG4DrIjj/F9Iaw+shEkiSCS7pluGQTlWfjdt DVKK4F8l6ywjDuvgY+nThwjkf66cBITrlSi/skyy0Hhkaq/KDFIwGOBeu/f1P2pfW/tw=; Received: from andrew by vps0.lunn.ch with local (Exim 4.94.2) (envelope-from ) id 1lqaj9-008KzF-3J; Tue, 08 Jun 2021 14:21:03 +0200 Date: Tue, 8 Jun 2021 14:21:03 +0200 From: Andrew Lunn To: Zhou Yanjie Cc: davem@davemloft.net, kuba@kernel.org, robh+dt@kernel.org, peppe.cavallaro@st.com, alexandre.torgue@foss.st.com, joabreu@synopsys.com, mcoquelin.stm32@gmail.com, linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, dongsheng.qiu@ingenic.com, aric.pzqi@ingenic.com, rick.tyliu@ingenic.com, sihui.liu@ingenic.com, jun.jiang@ingenic.com, sernia.zhou@foxmail.com, paul@crapouillou.net Subject: Re: [PATCH 2/2] net: stmmac: Add Ingenic SoCs MAC support. Message-ID: References: <1623086867-119039-1-git-send-email-zhouyanjie@wanyeetech.com> <1623086867-119039-3-git-send-email-zhouyanjie@wanyeetech.com> <6532a195-65db-afb3-37a2-f68bfed9d908@wanyeetech.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <6532a195-65db-afb3-37a2-f68bfed9d908@wanyeetech.com> Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org > > > + case PHY_INTERFACE_MODE_RGMII: > > > + val = FIELD_PREP(MACPHYC_TX_SEL_MASK, MACPHYC_TX_SEL_DELAY) | > > > + FIELD_PREP(MACPHYC_TX_DELAY_MASK, MACPHYC_TX_DELAY_63_UNIT) | > > > + FIELD_PREP(MACPHYC_RX_SEL_MASK, MACPHYC_RX_SEL_ORIGIN) | > > > + FIELD_PREP(MACPHYC_PHY_INFT_MASK, MACPHYC_PHY_INFT_RGMII); > > What exactly does MACPHYC_TX_DELAY_63_UNIT mean here? Ideally, the MAC > > should not be adding any RGMII delays. It should however pass mode > > through to the PHY, so it can add the delays, if the mode indicates it > > should, e.g. PHY_INTERFACE_MODE_RGMII_ID. This is also why you should > > be handling all 4 RGMII modes here, not just one. > > > MACPHYC_TX_DELAY_63_UNIT means set MAC TX clk delay to 63 units (similar to the "tx-delay" in dwmac-rk.c). However, the manual does not clearly describe the time span of one unit, after consulting engineer of Ingenic, I learned that the value is recommended to be set to 63. > I will change it to be similar to the way done in dwmac-rk.c. Please wrap your text to around 75 characters per line. I suspect you don't understand RGMII delays. As i said, normally, the MAC does not add delays, the PHY does. Please take a closer look at this. Andrew