From patchwork Thu Aug 20 09:20:59 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 265505 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=-12.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 812EDC433E3 for ; Thu, 20 Aug 2020 12:02:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5C99C22CE3 for ; Thu, 20 Aug 2020 12:02:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597924938; bh=07OtW7d5134FkJsRUqn7e/OAUYC/AtgYEEoc7+iC8Os=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=1ETSU8oZu97x9mpl15wFojWIVm6xakKSAjZJuTUv2Yv33VZtXkbp4VeP+424VHtYl NOoi81G6p/GdDhiPMb/mps7nhM3iUmrmOcnzMy1rfdzre/KRE+Ri83sGTs1kQTD9mP NQifYjxM+xmxyQbrW3RI3vtFf+NCYcGqLUziWlJ0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728682AbgHTMCQ (ORCPT ); Thu, 20 Aug 2020 08:02:16 -0400 Received: from mail.kernel.org ([198.145.29.99]:47138 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730443AbgHTJ7z (ORCPT ); Thu, 20 Aug 2020 05:59:55 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.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 2A6E82067C; Thu, 20 Aug 2020 09:59:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597917594; bh=07OtW7d5134FkJsRUqn7e/OAUYC/AtgYEEoc7+iC8Os=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Uj311MKkTnZP1Ie+CVbw9aJo28UtwQWTT7p51lKq/5nF7b4z+80BmAUT3opwwM21n WJbofSOjfbaWONgBl6K65fXG82ezhhc5DGMpA9Z8F7wNCrsc6uPhmr/2vSQtMmzr8t qB9b3oCT0HonGH3W7fsBt4M4iiCHQc2rKAGMhvvU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Finn Thain , Stan Johnson , Joshua Thompson , Geert Uytterhoeven , Sasha Levin Subject: [PATCH 4.9 086/212] m68k: mac: Fix IOP status/control register writes Date: Thu, 20 Aug 2020 11:20:59 +0200 Message-Id: <20200820091606.692314497@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200820091602.251285210@linuxfoundation.org> References: <20200820091602.251285210@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Finn Thain [ Upstream commit 931fc82a6aaf4e2e4a5490addaa6a090d78c24a7 ] When writing values to the IOP status/control register make sure those values do not have any extraneous bits that will clear interrupt flags. To place the SCC IOP into bypass mode would be desirable but this is not achieved by writing IOP_DMAINACTIVE | IOP_RUN | IOP_AUTOINC | IOP_BYPASS to the control register. Drop this ineffective register write. Remove the flawed and unused iop_bypass() function. Make use of the unused iop_stop() function. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Finn Thain Tested-by: Stan Johnson Cc: Joshua Thompson Link: https://lore.kernel.org/r/09bcb7359a1719a18b551ee515da3c4c3cf709e6.1590880333.git.fthain@telegraphics.com.au Signed-off-by: Geert Uytterhoeven Signed-off-by: Sasha Levin --- arch/m68k/mac/iop.c | 12 +++--------- 1 file changed, 3 insertions(+), 9 deletions(-) diff --git a/arch/m68k/mac/iop.c b/arch/m68k/mac/iop.c index 8209a74fbdebc..cb516cacc819b 100644 --- a/arch/m68k/mac/iop.c +++ b/arch/m68k/mac/iop.c @@ -173,7 +173,7 @@ static __inline__ void iop_writeb(volatile struct mac_iop *iop, __u16 addr, __u8 static __inline__ void iop_stop(volatile struct mac_iop *iop) { - iop->status_ctrl &= ~IOP_RUN; + iop->status_ctrl = IOP_AUTOINC; } static __inline__ void iop_start(volatile struct mac_iop *iop) @@ -181,14 +181,9 @@ static __inline__ void iop_start(volatile struct mac_iop *iop) iop->status_ctrl = IOP_RUN | IOP_AUTOINC; } -static __inline__ void iop_bypass(volatile struct mac_iop *iop) -{ - iop->status_ctrl |= IOP_BYPASS; -} - static __inline__ void iop_interrupt(volatile struct mac_iop *iop) { - iop->status_ctrl |= IOP_IRQ; + iop->status_ctrl = IOP_IRQ | IOP_RUN | IOP_AUTOINC; } static int iop_alive(volatile struct mac_iop *iop) @@ -239,7 +234,6 @@ void __init iop_preinit(void) } else { iop_base[IOP_NUM_SCC] = (struct mac_iop *) SCC_IOP_BASE_QUADRA; } - iop_base[IOP_NUM_SCC]->status_ctrl = 0x87; iop_scc_present = 1; } else { iop_base[IOP_NUM_SCC] = NULL; @@ -251,7 +245,7 @@ void __init iop_preinit(void) } else { iop_base[IOP_NUM_ISM] = (struct mac_iop *) ISM_IOP_BASE_QUADRA; } - iop_base[IOP_NUM_ISM]->status_ctrl = 0; + iop_stop(iop_base[IOP_NUM_ISM]); iop_ism_present = 1; } else { iop_base[IOP_NUM_ISM] = NULL;