From mboxrd@z Thu Jan 1 00:00:00 1970 From: Russell King - ARM Linux Subject: Re: [PATCH 0/7] dmaengine:omap-dma: Linked List transfer for slave_sg Date: Mon, 18 Jul 2016 11:31:37 +0100 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 Return-path: Content-Disposition: inline In-Reply-To: <20160714124242.7579-1-peter.ujfalusi@ti.com> Sender: linux-kernel-owner@vger.kernel.org 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 List-Id: linux-omap@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.