From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lauri Hintsala Subject: Re: mxs-auart serial driver DMA support? Date: Thu, 12 Jan 2012 12:28:11 +0200 Message-ID: <4F0EB5BB.1060008@bluegiga.com> References: <4F0E7EB0.2060906@bluegiga.com> <20120112094244.GA2775@pengutronix.de> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from bluegiga.fi ([194.100.31.45]:37028 "EHLO darkblue.bluegiga.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751317Ab2ALK2O (ORCPT ); Thu, 12 Jan 2012 05:28:14 -0500 In-Reply-To: <20120112094244.GA2775@pengutronix.de> Sender: linux-serial-owner@vger.kernel.org List-Id: linux-serial@vger.kernel.org To: Wolfram Sang Cc: Sascha Hauer , "linux-arm-kernel@lists.infradead.org" , linux-serial@vger.kernel.org On 01/12/2012 11:42 AM, Wolfram Sang wrote: > >> Any plans to add DMA support for mxs-auart serial driver? I noticed >> it is impossible to archive full 3.25 Mbs speed with current one. > > No plans from our side, currently. OK, AUART works fine with 115200 bps but over that it loose data randomly. I have seen fifo overrun errors during receiving data with 1Mbs and over. So current driver is unuseful with higher baud rates. Regards, Lauri From mboxrd@z Thu Jan 1 00:00:00 1970 From: lauri.hintsala@bluegiga.com (Lauri Hintsala) Date: Thu, 12 Jan 2012 12:28:11 +0200 Subject: mxs-auart serial driver DMA support? In-Reply-To: <20120112094244.GA2775@pengutronix.de> References: <4F0E7EB0.2060906@bluegiga.com> <20120112094244.GA2775@pengutronix.de> Message-ID: <4F0EB5BB.1060008@bluegiga.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 01/12/2012 11:42 AM, Wolfram Sang wrote: > >> Any plans to add DMA support for mxs-auart serial driver? I noticed >> it is impossible to archive full 3.25 Mbs speed with current one. > > No plans from our side, currently. OK, AUART works fine with 115200 bps but over that it loose data randomly. I have seen fifo overrun errors during receiving data with 1Mbs and over. So current driver is unuseful with higher baud rates. Regards, Lauri