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=-0.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,T_DKIMWL_WL_HIGH, URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by aws-us-west-2-korg-lkml-1.web.codeaurora.org (Postfix) with ESMTP id 24551C07D5C for ; Thu, 14 Jun 2018 14:08:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CE842208DB for ; Thu, 14 Jun 2018 14:08:42 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="QjjZJLLR" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CE842208DB Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965294AbeFNOIi (ORCPT ); Thu, 14 Jun 2018 10:08:38 -0400 Received: from mail.kernel.org ([198.145.29.99]:49280 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965278AbeFNOIe (ORCPT ); Thu, 14 Jun 2018 10:08:34 -0400 Received: from localhost (LFbn-1-12247-202.w90-92.abo.wanadoo.fr [90.92.61.202]) (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 C87AC208DB; Thu, 14 Jun 2018 14:08:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1528985314; bh=U6IKRqpPlmrRAg+I9zBkhCf4MvN7eHRfw3FBNYoH7Mw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=QjjZJLLROi6LVZo6iTh/6Z5Z4DR/LQzCxeTF/l8V2tj+pQWYgB55ETS20p1MVQzZl rKx21DNgMGITHJ3J4hdPeZfeBMZxOX1imHZXEUJL4pNWiaSOByVoeB3eiRQqIenJ4a N3pI+zUwKf3vgPOfo4YEmz/sYBEWD+C2Xgx52CL0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Marek Szyprowski , Krzysztof Kozlowski Subject: [PATCH 4.16 27/43] serial: samsung: fix maxburst parameter for DMA transactions Date: Thu, 14 Jun 2018 16:04:31 +0200 Message-Id: <20180614132137.133675239@linuxfoundation.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180614132135.111973468@linuxfoundation.org> References: <20180614132135.111973468@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.16-stable review patch. If anyone has any objections, please let me know. ------------------ From: Marek Szyprowski commit aa2f80e752c75e593b3820f42c416ed9458fa73e upstream. The best granularity of residue that DMA engine can report is in the BURST units, so the serial driver must use MAXBURST = 1 and DMA_SLAVE_BUSWIDTH_1_BYTE if it relies on exact number of bytes transferred by DMA engine. Fixes: 62c37eedb74c ("serial: samsung: add dma reqest/release functions") Signed-off-by: Marek Szyprowski Acked-by: Krzysztof Kozlowski Cc: stable Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/samsung.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) --- a/drivers/tty/serial/samsung.c +++ b/drivers/tty/serial/samsung.c @@ -862,15 +862,12 @@ static int s3c24xx_serial_request_dma(st dma->rx_conf.direction = DMA_DEV_TO_MEM; dma->rx_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; dma->rx_conf.src_addr = p->port.mapbase + S3C2410_URXH; - dma->rx_conf.src_maxburst = 16; + dma->rx_conf.src_maxburst = 1; dma->tx_conf.direction = DMA_MEM_TO_DEV; dma->tx_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; dma->tx_conf.dst_addr = p->port.mapbase + S3C2410_UTXH; - if (dma_get_cache_alignment() >= 16) - dma->tx_conf.dst_maxburst = 16; - else - dma->tx_conf.dst_maxburst = 1; + dma->tx_conf.dst_maxburst = 1; dma->rx_chan = dma_request_chan(p->port.dev, "rx");