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=-9.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 C1CABC282CE for ; Mon, 11 Feb 2019 16:14:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 848BC21B1C for ; Mon, 11 Feb 2019 16:14:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1549901640; bh=acPA05ksUwwd+JZIXw0ObUm/pHn8Vx/V8X+9UoydjqM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=lCAscDylKBZnJG+trPxrlTwNCOJzNAyEbahwuVFQMabr5mJ7W0ocp+/fBs6DCj5XC AbRh5eyYoCz3yjxe2WHuRyf4m3M2vGUcGh5QSs1qjfTfTe2nAjPtdeVS+ZlsatF6OX 4+SP+T1IHJWmdgO47d2kXRONaZLQVT/PKC4+6vBQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728652AbfBKOWI (ORCPT ); Mon, 11 Feb 2019 09:22:08 -0500 Received: from mail.kernel.org ([198.145.29.99]:55006 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727375AbfBKOWH (ORCPT ); Mon, 11 Feb 2019 09:22:07 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 0642E20838; Mon, 11 Feb 2019 14:22:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1549894926; bh=acPA05ksUwwd+JZIXw0ObUm/pHn8Vx/V8X+9UoydjqM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=IIA45Q03xMqHGZFTg2tdZ3p2eg/gEuJrzo++GDhRSUkspnrF432LrITu6p82iuHum 10HCzPCVkMqYmTnvvM9Ge7gRjqBb44l+ZqOjKY1NK/to/ySDCeFXuDCLXjvDcHiPBc vFfNhXjfyOLugSBCmpnKVNiePuOiD3/pLhwd0fhk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Paul Burton , linux-mips@linux-mips.org, Sasha Levin Subject: [PATCH 4.20 033/352] MIPS: Boston: Disable EG20T prefetch Date: Mon, 11 Feb 2019 15:14:20 +0100 Message-Id: <20190211141848.446543525@linuxfoundation.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190211141846.543045703@linuxfoundation.org> References: <20190211141846.543045703@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org 4.20-stable review patch. If anyone has any objections, please let me know. ------------------ [ Upstream commit 5ec17af7ead09701e23d2065e16db6ce4e137289 ] The Intel EG20T Platform Controller Hub used on the MIPS Boston development board supports prefetching memory to optimize DMA transfers. Unfortunately for unknown reasons this doesn't work well with some MIPS CPUs such as the P6600, particularly when using an I/O Coherence Unit (IOCU) to provide cache-coherent DMA. In these systems it is common for DMA data to be lost, resulting in broken access to EG20T devices such as the MMC or SATA controllers. Support for a DT property to configure the prefetching was added a while back by commit 549ce8f134bd ("misc: pch_phub: Read prefetch value from device tree if passed") but we never added the DT snippet to make use of it. Add that now in order to disable the prefetching & fix DMA on the affected systems. Signed-off-by: Paul Burton Patchwork: https://patchwork.linux-mips.org/patch/21068/ Cc: linux-mips@linux-mips.org Signed-off-by: Sasha Levin --- arch/mips/boot/dts/img/boston.dts | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/mips/boot/dts/img/boston.dts b/arch/mips/boot/dts/img/boston.dts index 65af3f6ba81c..84328afa3a55 100644 --- a/arch/mips/boot/dts/img/boston.dts +++ b/arch/mips/boot/dts/img/boston.dts @@ -141,6 +141,12 @@ #size-cells = <2>; #interrupt-cells = <1>; + eg20t_phub@2,0,0 { + compatible = "pci8086,8801"; + reg = <0x00020000 0 0 0 0>; + intel,eg20t-prefetch = <0>; + }; + eg20t_mac@2,0,1 { compatible = "pci8086,8802"; reg = <0x00020100 0 0 0 0>; -- 2.19.1