From mboxrd@z Thu Jan 1 00:00:00 1970 From: Adrian Hunter Subject: Re: [Patch v4] OMAP: sDMA driver: descriptor autoloading feature Date: Wed, 06 Jan 2010 15:16:01 +0200 Message-ID: <4B448D11.5060400@nokia.com> References: <618f0c910912110701p771dcf6fg655bb0a7b9bdc96d@mail.gmail.com> <20091228214846.GP3512@atomide.com> <618f0c911001032303p5d103f3et6271a71e1e5fbc96@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from smtp.nokia.com ([192.100.122.233]:44860 "EHLO mgw-mx06.nokia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932158Ab0AFNRP (ORCPT ); Wed, 6 Jan 2010 08:17:15 -0500 In-Reply-To: <618f0c911001032303p5d103f3et6271a71e1e5fbc96@mail.gmail.com> Sender: linux-omap-owner@vger.kernel.org List-Id: linux-omap@vger.kernel.org To: Venkatraman S Cc: Tony Lindgren , Russell King - ARM Linux , Santosh Shilimkar , Kevin Hilman , "linux-omap@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "Lavinen Jarkko (Nokia-M/Helsinki)" Venkatraman S wrote: > On Tue, Dec 29, 2009 at 3:18 AM, Tony Lindgren wrote: >> * Venkatraman S [091211 07:01]: >>> Here is the most updated version of the patch (thanks to Russell's >>> review). This patch is applicable to OMAP4xxx as well as OMAP3630 >>> Reference to previous posts >>> v1 http://marc.info/?l=linux-omap&m=125012097403050&w=2 >>> v2 http://marc.info/?l=linux-omap&m=125137152606644&w=2 >>> v3 http://patchwork.kernel.org/patch/45408/ >> Do you have a patch for drivers/mmc/host/omap_hsmmc.c to >> use this feature? Or some other driver? >> >> Regards, >> >> Tony > > I am about to start working on omap_hsmmc to use the descriptor load > feature. If the DMA changes are acceptable, I can post the driver > patch as well. I presume this is about performance. How does it compare to chained DMA? We have a patch for omap_hsmmc for chained DMA that we are still testing.