From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161014AbcFHDVV (ORCPT ); Tue, 7 Jun 2016 23:21:21 -0400 Received: from mga01.intel.com ([192.55.52.88]:14054 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932290AbcFHDVT (ORCPT ); Tue, 7 Jun 2016 23:21:19 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.26,437,1459839600"; d="scan'208";a="983043284" Date: Wed, 8 Jun 2016 08:57:55 +0530 From: Vinod Koul To: Peter Ujfalusi Cc: dan.j.williams@intel.com, dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org, nsekhar@ti.com, tony@atomide.com Subject: Re: [PATCH] dmaengine: edma: Use early completion for intermediate paRAM set in slave_sg Message-ID: <20160608032755.GN16910@localhost> References: <20160607081944.21447-1-peter.ujfalusi@ti.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20160607081944.21447-1-peter.ujfalusi@ti.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jun 07, 2016 at 11:19:44AM +0300, Peter Ujfalusi wrote: > The driver limits the physical number of paRAM slots to be used by channels. > If the transfer needs more slots (more SGs) then the transfer is broken up > to smaller chunks. When the chunk is finished the driver will rewrite the > physical slots and continues the transfer. This set up time can take some > time and we might miss DMA events. If the intermediate set completion is > using early completion (the interrupt will happen when the last slot is > issued to the TPTC and not when the transfer is finished by the TPTC) we > will have a bit more time to update the paRAM slots and less likely to have > missed events. Applied, thanks -- ~Vinod