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 6D7F0C282CE for ; Mon, 11 Feb 2019 14:40:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3F95B2081B for ; Mon, 11 Feb 2019 14:40:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1549896059; bh=PydW0YDZknXimo8mvWD/NZEe7P9K2HpG6x63754TK5U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=DxNzUj3ToHczrchOLPEQ68t57VcfV1XEdTnZY2+DjramrM9LOA0YSFcWmID4aTLYp hJ+7HB6zYKxB4p/3Iudb5Enkzt+uTHG5o1VBJ54rKe22feiDJTsFiTga2Vq4T/kEF+ EA5StUMl9SxohqYRr79CdSUDVAkyGABqcrbhY3tE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732150AbfBKOk5 (ORCPT ); Mon, 11 Feb 2019 09:40:57 -0500 Received: from mail.kernel.org ([198.145.29.99]:51988 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732096AbfBKOky (ORCPT ); Mon, 11 Feb 2019 09:40:54 -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 67DF22082F; Mon, 11 Feb 2019 14:40:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1549896053; bh=PydW0YDZknXimo8mvWD/NZEe7P9K2HpG6x63754TK5U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=wtTX0xQRcrR/iqPhDAbgalQdVFJvGoylkqxtimopGReJIlZoBuqG9201nZdP0e6ft BLXhJoL66T3+kb5AVg97gcMN3oZZKzDOySig1Sll+LfTDCC7opeRJhsvmA2ZTWIhzr hLg+gqH4DnNFs5SgIjhvJzj+IM1ZneCk1hRElp+k= 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 4.19 028/313] MIPS: Boston: Disable EG20T prefetch Date: Mon, 11 Feb 2019 15:15:08 +0100 Message-Id: <20190211141855.302860400@linuxfoundation.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190211141852.749630980@linuxfoundation.org> References: <20190211141852.749630980@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: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.19-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