From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752071Ab2DQHPx (ORCPT ); Tue, 17 Apr 2012 03:15:53 -0400 Received: from metasoft.pl ([195.149.224.191]:34400 "EHLO smtp.metasoft.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750890Ab2DQHPw (ORCPT ); Tue, 17 Apr 2012 03:15:52 -0400 X-clamdmail: clamdmail 0.18a Message-ID: <4F8D189B.3010100@metasoft.pl> Date: Tue, 17 Apr 2012 09:15:39 +0200 From: Rafal Prylowski User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:11.0) Gecko/20120327 Thunderbird/11.0.1 MIME-Version: 1.0 To: H Hartley Sweeten CC: Mika Westerberg , "vinod.koul@intel.com" , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "rmallon@gmail.com" Subject: Re: [PATCH] ep93xx: Implement double buffering for M2M DMA channels References: <4F683B36.8090101@metasoft.pl> <20120321193836.GC3740@mwesterb-mobl.ger.corp.intel.com> <20120323070446.GC5812@mwesterb-mobl.ger.corp.intel.com> <20120410172853.GA25697@mwesterb-mobl> <4F853053.7040800@metasoft.pl> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-2 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2012-04-16 20:59, H Hartley Sweeten wrote: > On Wednesday, April 11, 2012 12:19 AM, Rafal Prylowski wrote: > > Rafal, > > This patch still doesn't work on my ep93xx system. > It appears your patch is causing an interrupt storm on my system. > Could you please apply the following patch on top of double buffering patch? I would like to know the state of dma channel when you get that interrupt storm. Thanks, RP Index: linux-2.6/drivers/dma/ep93xx_dma.c =================================================================== --- linux-2.6.orig/drivers/dma/ep93xx_dma.c +++ linux-2.6/drivers/dma/ep93xx_dma.c @@ -606,6 +606,7 @@ static int m2m_hw_interrupt(struct ep93x */ last = list_first_entry(edmac->active.next, struct ep93xx_dma_desc, node)->txd.cookie; + printk("M2M: %x %s\n", status, last ? "last" : ""); /* * Use M2M DMA Buffer FSM and Control FSM to check current state of