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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0C17CC433FE for ; Tue, 9 Nov 2021 01:03:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E4D8A61A3F for ; Tue, 9 Nov 2021 01:03:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236879AbhKIBGY (ORCPT ); Mon, 8 Nov 2021 20:06:24 -0500 Received: from mail.kernel.org ([198.145.29.99]:33602 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241665AbhKIBEi (ORCPT ); Mon, 8 Nov 2021 20:04:38 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id B1A896134F; Tue, 9 Nov 2021 01:01:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1636419705; bh=5TaTadUUlRIm99JBWT3Hg8pPrx4O+pzJ82CGst/LFJc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oR9PtkNepNw/FQCeWeEJy9CSf/UYxciMoZF5BlG5mFCbAGxjE32wSUekvqHqsCikG 17++obtKqpKblUy9rs+Lg/5CyO7LpgcLqWPEP2Gr8uzeRmS2OBxjxqZWdPY7Nbjjgu F8kP6F1dMSOVieAt9xCFVY9NqkmZkI2sOrzEsM1ZURc+YNdP3ppN+kNWgWnF0+yCQA Cp5YoaK9FgE30LzE/iQE45augMfrYicdoJe97ivWG0CfC7aDIAWF0e37KA0ZJo6A0k B2sZhkKW/n2En1o0KbE6z+g035D1Q6mGsbS8K+HcTap3WOgsf+vpvBVuiGlqYt8xAD 0fEtB5phIGQug== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Aleksander Jan Bajkowski , "David S . Miller" , Sasha Levin , john@phrozen.org, tsbogend@alpha.franken.de, hauke@hauke-m.de, maz@kernel.org, linux-mips@vger.kernel.org Subject: [PATCH AUTOSEL 5.14 010/138] MIPS: lantiq: dma: add small delay after reset Date: Mon, 8 Nov 2021 12:44:36 -0500 Message-Id: <20211108174644.1187889-10-sashal@kernel.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20211108174644.1187889-1-sashal@kernel.org> References: <20211108174644.1187889-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org From: Aleksander Jan Bajkowski [ Upstream commit c12aa581f6d5e80c3c3675ab26a52c2b3b62f76e ] Reading the DMA registers immediately after the reset causes Data Bus Error. Adding a small delay fixes this issue. Signed-off-by: Aleksander Jan Bajkowski Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- arch/mips/lantiq/xway/dma.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/mips/lantiq/xway/dma.c b/arch/mips/lantiq/xway/dma.c index 63dccb2ed08b2..2784715933d13 100644 --- a/arch/mips/lantiq/xway/dma.c +++ b/arch/mips/lantiq/xway/dma.c @@ -11,6 +11,7 @@ #include #include #include +#include #include #include @@ -222,6 +223,8 @@ ltq_dma_init(struct platform_device *pdev) clk_enable(clk); ltq_dma_w32_mask(0, DMA_RESET, LTQ_DMA_CTRL); + usleep_range(1, 10); + /* disable all interrupts */ ltq_dma_w32(0, LTQ_DMA_IRNEN); -- 2.33.0