Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754196AbZCKX32 (ORCPT ); Wed, 11 Mar 2009 19:29:28 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751170AbZCKX3S (ORCPT ); Wed, 11 Mar 2009 19:29:18 -0400 Received: from nwd2mail11.analog.com ([137.71.25.57]:22837 "EHLO nwd2mail11.analog.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750916AbZCKX3S convert rfc822-to-8bit (ORCPT ); Wed, 11 Mar 2009 19:29:18 -0400 X-IronPort-AV: E=Sophos;i="4.38,346,1233550800"; d="scan'208";a="67748461" From: Robin Getz Organization: Blackfin uClinux org To: "Will Newton" Subject: Re: [PATCH 7/7] mmc_spi: support for non-byte-aligned cards Date: Wed, 11 Mar 2009 19:42:49 -0400 User-Agent: KMail/1.9.5 CC: Wolfgang =?utf-8?q?M=C3=BCes?= , "Pierre Ossman" , "Andrew Morton" , "Matt Fleming" , "David Brownell" , "Mike Frysinger" , linux-kernel@vger.kernel.org References: <87a5b0800903110738h508aae87y7fc462d30cc89c7f@mail.gmail.com> <200903111600.05835.wolfgang.mues@auerswald.de> <87a5b0800903110803k5e8a8ee4m50c572d845a38cb0@mail.gmail.com> In-Reply-To: <87a5b0800903110803k5e8a8ee4m50c572d845a38cb0@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8BIT Content-Disposition: inline Message-ID: <200903111942.49341.rgetz@blackfin.uclinux.org> X-OriginalArrivalTime: 11 Mar 2009 23:29:15.0803 (UTC) FILETIME=[31579EB0:01C9A2A1] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1498 Lines: 41 On Wed 11 Mar 2009 11:03, Will Newton pondered: > On Wed, Mar 11, 2009 at 3:00 PM, Wolfgang Mües > wrote: > > Will, > > > > Am Mittwoch, 11. März 2009 schrieb Will Newton: > >> Are they using the same host controller? Have you tried these cards > >> with a different host controller? > > > > I have tried with 3 different spi host controllers. > > > >> Are you clocking them particularly slow or fast? > > > > 400 KHz, 20 MHz and 25 MHz. > > > >> A logic probe may not display any signal integrity issues you might have. > > > > My "logic probe" is a 1 GHz leCroy DSO. > > > > I am doing this for money, and I am no amateur. > > Ok, sure, but these are things that are best put in your changleogs so > people can understand what hardware is problematic and how it is > proven. > > I have not seen these problems or seen them reported by others. > Hopefully they will speak up and confirm your results. We have seen the same issues, and have had various Blackfin users report the same with a select number of cards. (including Kingston cards that Wolfgang referenced). A few (who also had ARM platforms) said they saw the same on different SPI controllers - so I don't think it is a Blackfin specific issue. -Robin -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/