From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hannes Reinecke Subject: Re: [PATCH v3 72/77] ncr5380: Fix pseudo DMA transfers on 53C400 Date: Tue, 22 Dec 2015 09:06:39 +0100 Message-ID: <5679048F.9090000@suse.de> References: <20151222011737.980475848@telegraphics.com.au> <20151222011757.605771566@telegraphics.com.au> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <20151222011757.605771566@telegraphics.com.au> Sender: linux-kernel-owner@vger.kernel.org To: Finn Thain , "James E.J. Bottomley" , Michael Schmitz , linux-m68k@vger.kernel.org, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, "Martin K. Petersen" Cc: Ondrej Zary List-Id: linux-scsi@vger.kernel.org On 12/22/2015 02:18 AM, Finn Thain wrote: > From: Ondrej Zary > > Pseudo-DMA (PDMA) has been broken for ages, resulting in hangs on > 53C400-based cards. > > According to 53C400 datasheet, PDMA transfer length must be a multipl= e > of 128. Check if that's true and use PIO if it's not. > > This makes PDMA work on 53C400 (Canon FG2-5202). > > Signed-off-by: Ondrej Zary > Signed-off-by: Finn Thain > Reviewed-by: Hannes Reinecke Cheers, Hannes --=20 Dr. Hannes Reinecke zSeries & Storage hare@suse.de +49 911 74053 688 SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 N=FCrnberg GF: J. Hawn, J. Guild, F. Imend=F6rffer, HRB 16746 (AG N=FCrnberg)