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=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 46113C282C8 for ; Mon, 28 Jan 2019 17:50:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 08FFB2175B for ; Mon, 28 Jan 2019 17:50:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1548697805; bh=XHvGrq9LUVK3VhEp6c72qxwXepi97IZhYICnHguuWkc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=u9diooQVvawQLeylNsaGYPRfxBBv1nQHwPaJcxNAhJaahsYQ01PTycWpiNv+0+YxV niFklpmHeECvGEvROwu2aAVQ48+rnOxwMXm4lqWH3igVb12QzPv3MWdubyLEUUErk9 RG4rN6jfU/+vAbhCtgeIehDuLrWCj9UHiRbdSJ/Q= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727583AbfA1Po4 (ORCPT ); Mon, 28 Jan 2019 10:44:56 -0500 Received: from mail.kernel.org ([198.145.29.99]:58274 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727571AbfA1Poz (ORCPT ); Mon, 28 Jan 2019 10:44:55 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 3FB1521741; Mon, 28 Jan 2019 15:44:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1548690294; bh=XHvGrq9LUVK3VhEp6c72qxwXepi97IZhYICnHguuWkc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=g5kBFrBS7oHHq+A8SbczQoZzywrZE1psXqqkFzY0Nx54GLI5DE3yhqGS6XPV1ySB7 zCF+FNi6LjpSkhWJBigcj/X9BZfMF1M/O7WlxqCpdIgP7AZiUGpyFtLe8desAhdRGA aDHrZRhgrp3NeP1iUNjmcSjfYLHO+P2uKU2aVtqw= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Paul Burton , linux-mips@linux-mips.org, Sasha Levin , linux-mips@vger.kernel.org, devicetree@vger.kernel.org Subject: [PATCH AUTOSEL 4.20 037/304] MIPS: Boston: Disable EG20T prefetch Date: Mon, 28 Jan 2019 10:39:14 -0500 Message-Id: <20190128154341.47195-37-sashal@kernel.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190128154341.47195-1-sashal@kernel.org> References: <20190128154341.47195-1-sashal@kernel.org> MIME-Version: 1.0 X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Paul Burton [ 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