From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754707AbYJLIoV (ORCPT ); Sun, 12 Oct 2008 04:44:21 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751418AbYJLIoN (ORCPT ); Sun, 12 Oct 2008 04:44:13 -0400 Received: from server.drzeus.cx ([85.8.24.28]:47783 "EHLO smtp.drzeus.cx" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751371AbYJLIoM (ORCPT ); Sun, 12 Oct 2008 04:44:12 -0400 Date: Sun, 12 Oct 2008 10:44:05 +0200 From: Pierre Ossman To: Haavard Skinnemoen Cc: kernel@avr32linux.org, linux-kernel@vger.kernel.org, Haavard Skinnemoen Subject: Re: [PATCH v2 5/7] atmel-mci: Add experimental DMA support Message-ID: <20081012104405.1ab7551d@mjolnir.drzeus.cx> In-Reply-To: <1223223690-2637-6-git-send-email-haavard.skinnemoen@atmel.com> References: <1223223690-2637-1-git-send-email-haavard.skinnemoen@atmel.com> <1223223690-2637-2-git-send-email-haavard.skinnemoen@atmel.com> <1223223690-2637-3-git-send-email-haavard.skinnemoen@atmel.com> <1223223690-2637-4-git-send-email-haavard.skinnemoen@atmel.com> <1223223690-2637-5-git-send-email-haavard.skinnemoen@atmel.com> <1223223690-2637-6-git-send-email-haavard.skinnemoen@atmel.com> X-Mailer: Claws Mail 3.6.0 (GTK+ 2.14.3; i386-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: multipart/signed; protocol="application/pgp-signature"; micalg=PGP-SHA1; boundary="=_freyr.drzeus.cx-11782-1223801052-0001-2" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is a MIME-formatted message. If you see this text it means that your E-mail software does not support MIME-formatted messages. --=_freyr.drzeus.cx-11782-1223801052-0001-2 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable On Sun, 5 Oct 2008 18:21:28 +0200 Haavard Skinnemoen wrote: > This adds support for DMA transfers through the generic DMA engine > framework with the DMA slave extensions. >=20 > The driver has been tested using mmc-block and ext3fs on several SD, > SDHC and MMC+ cards. Reads and writes work fine, with read transfer > rates up to 7.5 MiB/s on fast cards with debugging disabled. >=20 > Unfortunately, the driver has been known to lock up from time to time > with DMA enabled, so DMA support is currently optional and marked > EXPERIMENTAL. However, I didn't see any problems while testing 13 > different cards (MMC, SD and SDHC of different brands and sizes), so I > suspect the "Initialize BLKR before sending data transfer command" fix > that was posted earlier fixed this as well. >=20 > Signed-off-by: Haavard Skinnemoen > --- Looks good, but I assume the plan is to remove this Kconfig option once you're confident it is stable? --=20 -- Pierre Ossman Linux kernel, MMC maintainer http://www.kernel.org rdesktop, core developer http://www.rdesktop.org WARNING: This correspondence is being monitored by the Swedish government. Make sure your server uses encryption for SMTP traffic and consider using PGP for end-to-end encryption. --=_freyr.drzeus.cx-11782-1223801052-0001-2 Content-Type: application/pgp-signature; name="signature.asc" Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.9 (GNU/Linux) iEYEARECAAYFAkjxuNkACgkQ7b8eESbyJLh5GACgoIxp1IIt5vIfIkFWH8G8+0Rw Yb8AnisuBI3rbxTC29eEHYfwf+ET3gbm =vWzv -----END PGP SIGNATURE----- --=_freyr.drzeus.cx-11782-1223801052-0001-2--