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=-13.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,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 D144EC433E0 for ; Sat, 8 Aug 2020 23:40:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AA91D208B3 for ; Sat, 8 Aug 2020 23:40:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1596930053; bh=07OtW7d5134FkJsRUqn7e/OAUYC/AtgYEEoc7+iC8Os=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=MI/6ygbejcDbbVaOFibN/HC9vTaoXmdY5vevMKotAJIRxTgQdN/fw4PNQ/LdtQebR XHc2FH/wClE18Fc/sL/ZZ4fqUzBLCMlIPSBqst89Ux4C5XUeB07sO+jOTM/L9V/bNQ YTouS+fxon5GmgWy1OmNfweRMffpBzznUJFPW6iE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728918AbgHHXkv (ORCPT ); Sat, 8 Aug 2020 19:40:51 -0400 Received: from mail.kernel.org ([198.145.29.99]:56434 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728909AbgHHXkt (ORCPT ); Sat, 8 Aug 2020 19:40:49 -0400 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 A9EC520656; Sat, 8 Aug 2020 23:40:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1596930048; bh=07OtW7d5134FkJsRUqn7e/OAUYC/AtgYEEoc7+iC8Os=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DhWHbNtHkanpytKos/YLfTJoLOGn1OlM1NcKwmKNrw+ekys1ZppOXaF9WcLHNREQP OjXUZXOcvmPDjrgrju3tWYTd2IIb6uzIVv0N6XBYOr+m62BAvBO48t3N/zpdt/0PYw +DB+EBCZvqPVZ9Pmz1TI/eIpIaR20hGHFy5tAO+E= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Finn Thain , Stan Johnson , Joshua Thompson , Geert Uytterhoeven , Sasha Levin , linux-m68k@lists.linux-m68k.org Subject: [PATCH AUTOSEL 4.9 5/9] m68k: mac: Fix IOP status/control register writes Date: Sat, 8 Aug 2020 19:40:32 -0400 Message-Id: <20200808234037.3619732-5-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200808234037.3619732-1-sashal@kernel.org> References: <20200808234037.3619732-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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; -- 2.25.1