From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752130AbcGRKbu (ORCPT ); Mon, 18 Jul 2016 06:31:50 -0400 Received: from pandora.armlinux.org.uk ([78.32.30.218]:35535 "EHLO pandora.armlinux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751632AbcGRKbt (ORCPT ); Mon, 18 Jul 2016 06:31:49 -0400 Date: Mon, 18 Jul 2016 11:31:37 +0100 From: Russell King - ARM Linux To: Peter Ujfalusi Cc: vinod.koul@intel.com, linux-kernel@vger.kernel.org, dmaengine@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-omap@vger.kernel.org, tony@atomide.com Subject: Re: [PATCH 0/7] dmaengine:omap-dma: Linked List transfer for slave_sg Message-ID: <20160718103137.GG5783@n2100.arm.linux.org.uk> References: <20160714124242.7579-1-peter.ujfalusi@ti.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20160714124242.7579-1-peter.ujfalusi@ti.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jul 14, 2016 at 03:42:35PM +0300, Peter Ujfalusi wrote: > Hi, > > The following series with the final patch will add support for sDMA Linked List > transfer support. > Linked List is supported by sDMA in OMAP3630+ (OMAP4/5, dra7 family). > If the descriptor load feature is present we can create the descriptors for each > SG beforehand and let sDMA to walk them through. > This way the number of sDMA interrupts the kernel need to handle will drop > dramatically. I suggested this a few years ago, and I was told by TI that there was no interest to implement this feature as it had very little performance effect. Do I take it that TI have changed their position on this feature? -- RMK's Patch system: http://www.armlinux.org.uk/developer/patches/ FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up according to speedtest.net.