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=-5.0 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 B6B35C433E0 for ; Mon, 22 Feb 2021 17:57:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8236D64E40 for ; Mon, 22 Feb 2021 17:57:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231856AbhBVR4z (ORCPT ); Mon, 22 Feb 2021 12:56:55 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47300 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231843AbhBVR4p (ORCPT ); Mon, 22 Feb 2021 12:56:45 -0500 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 7368FC061574; Mon, 22 Feb 2021 09:56:03 -0800 (PST) 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=pRxdkKM/shNOUrE0VDWVoit+UMzavwHlgZAAJDI4xN4=; b=UujCKQ+crZxVjqrN529v5vjJu IKFneIJxGPv1feg6Hp0PTYC+iM7qla7kLEpYu2UIxbSqMpHW0+QjhfxBpfVrkY5lAjpieUVl+/LfA 8BmGqA22/5iUStJTFvT7acmbmsj4PxopuYW1Rqj9ztayoiVAR1w0BRcxvlE48eFuACp/crdzXR3Jm 8IXnXtIWmhXHos6KnV1x7dmYMTGMhTCRBiw7a5hSTYphslwkU4+ISXPTDZcFYHku4gwrB8zW7V8Bj 7w8k1h8EvrUr96EWUm/RAc8Ntbkc7vsB2LxNQy13In9lyz8vb2GyuJhIKru5Tx8s4iIepepI4dwXP CwTFYFc4g==; Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:46562) by pandora.armlinux.org.uk with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1lEFR0-0006dz-Qy; Mon, 22 Feb 2021 17:55:50 +0000 Received: from linux by shell.armlinux.org.uk with local (Exim 4.92) (envelope-from ) id 1lEFQz-0002Kn-Vb; Mon, 22 Feb 2021 17:55:50 +0000 Date: Mon, 22 Feb 2021 17:55:49 +0000 From: Russell King - ARM Linux admin To: Nicolas Saenz Julienne Cc: linux-pci , linux-arm-kernel , linux-rpi-kernel , devicetree , Rob Herring , Florian Fainelli , Bjorn Helgaas , Robin Murphy , bcm-kernel-feedback-list Subject: Re: RPi4 can't deal with 64 bit PCI accesses Message-ID: <20210222175549.GO1463@shell.armlinux.org.uk> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Sender: Russell King - ARM Linux admin Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org On Mon, Feb 22, 2021 at 04:47:22PM +0100, Nicolas Saenz Julienne wrote: > [2] Things might get even weirder as the order in which the 32bit operations > are performed might matter (low/high vs high/low). Note that arm32 does not provide writeq() very purposely because it is device specific whether writing high-then-low or low-then-high is the correct approach. See linux/io-64-nonatomic-*.h -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!