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=-0.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,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 BC56DC2D0C3 for ; Sat, 28 Dec 2019 00:34:11 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 9016120828 for ; Sat, 28 Dec 2019 00:34:11 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="mtVC7Gdj" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9016120828 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=davemloft.net Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-amlogic-bounces+linux-amlogic=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:Mime-Version:References:In-Reply-To: From:Subject:To:Message-Id:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=n/M+aeXv68T/YVbna7xO7QVPsZVmF1tgIhLjhyEHMxQ=; b=mtVC7GdjDzaCDz oAkWtUWoATAGrRJrV8dIIr0Q4El8nqr5j2uJJJwBpZOJ/d+mj3P6WvizjnjctBvMa46XRGyn1bTbl orgVt3HTN7zyyn6BXx7t8a7Ry7S9m7uRgwYvQ4ecwO7OcsPLg1GdH3zxzarOU/vCgynFBM2ykD1kU 4BzP5cNmVCZRcZ4RBjK6uNMEHY1DMTfiAKqcvV1fuMqMKq51veyu5f12FAqhwcogtPA1JmdAYGiIk e87VjwMb8jXCRlU3VDqhnv3hVuxkMpRqg4sINMrl4on7nBYWXl4d+a1/44K/KOpR6QH6u3xdl4met 44cUXTsPTDNA9p63Ir/Q==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1il03K-0000ED-0m; Sat, 28 Dec 2019 00:33:58 +0000 Received: from shards.monkeyblade.net ([2620:137:e000::1:9]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1il03I-0000Dk-5h; Sat, 28 Dec 2019 00:33:57 +0000 Received: from localhost (unknown [IPv6:2601:601:9f00:1c3::3d5]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) (Authenticated sender: davem-davemloft) by shards.monkeyblade.net (Postfix) with ESMTPSA id 39CAE154D1158; Fri, 27 Dec 2019 16:33:49 -0800 (PST) Date: Fri, 27 Dec 2019 16:33:48 -0800 (PST) Message-Id: <20191227.163348.1668601477335834984.davem@davemloft.net> To: martin.blumenstingl@googlemail.com Subject: Re: [PATCH 0/3] Meson8b/8m2: Ethernet RGMII TX delay fixes From: David Miller In-Reply-To: <20191225005655.1502037-1-martin.blumenstingl@googlemail.com> References: <20191225005655.1502037-1-martin.blumenstingl@googlemail.com> X-Mailer: Mew version 6.8 on Emacs 26.1 Mime-Version: 1.0 X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.5.12 (shards.monkeyblade.net [149.20.54.216]); Fri, 27 Dec 2019 16:33:49 -0800 (PST) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191227_163356_212691_62B604B9 X-CRM114-Status: UNSURE ( 5.76 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-amlogic@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linus.luessing@c0d3.blue, balbes-150@yandex.ru, khilman@baylibre.com, linux-kernel@vger.kernel.org, ingrassia@epigenesys.com, netdev@vger.kernel.org, linux-amlogic@lists.infradead.org, linux-arm-kernel@lists.infradead.org, jbrunet@baylibre.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-amlogic" Errors-To: linux-amlogic-bounces+linux-amlogic=archiver.kernel.org@lists.infradead.org From: Martin Blumenstingl Date: Wed, 25 Dec 2019 01:56:52 +0100 > The Ethernet TX performance has been historically bad on Meson8b and > Meson8m2 SoCs because high packet loss was seen. Today I (presumably) > found out why this is: the input clock (which feeds the RGMII TX clock) > has to be at least 4 times 125MHz. With the fixed "divide by 2" in the > clock tree this means that m250_div needs to be at least 2. ... It looks there needs to be more discussion on this series, please respin once the discussions are resolved. Thank you. _______________________________________________ linux-amlogic mailing list linux-amlogic@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-amlogic