Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755157AbYAJL6Y (ORCPT ); Thu, 10 Jan 2008 06:58:24 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753050AbYAJL6L (ORCPT ); Thu, 10 Jan 2008 06:58:11 -0500 Received: from gateway.drzeus.cx ([85.8.24.16]:49449 "EHLO smtp.drzeus.cx" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752810AbYAJL6K (ORCPT ); Thu, 10 Jan 2008 06:58:10 -0500 Date: Thu, 10 Jan 2008 12:57:48 +0100 From: Pierre Ossman To: "Bryan Wu" Cc: "Cai, Cliff" , "Mike Frysinger" , linux-kernel@vger.kernel.org Subject: Re: [patch] split MMC_CAP_4_BIT_DATA Message-ID: <20080110125748.416ad0c5@poseidon.drzeus.cx> In-Reply-To: <386072610801100122n52339488ke2b8724c390be765@mail.gmail.com> References: <386072610801081832w2befcbafwe9215067f022ed5d@mail.gmail.com> <0F1B54C89D5F954D8535DB252AF412FA014FAD4A@chinexm1.ad.analog.com> <20080109082325.212ec90d@poseidon.drzeus.cx> <386072610801090845r14510fb8tbcca76d605458a96@mail.gmail.com> <20080110095428.3b93fd18@poseidon.drzeus.cx> <386072610801100122n52339488ke2b8724c390be765@mail.gmail.com> X-Mailer: Claws Mail 3.2.0 (GTK+ 2.12.3; i386-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1439 Lines: 32 On Thu, 10 Jan 2008 17:22:55 +0800 "Bryan Wu" wrote: > > At page 4-3 of ADSP-BF54x Blackfin(R) Processor Peripheral Hardware > Reference, there is a table which guide us the SDH controller does not > support 4-bit mode MMC card. Please found the table picture in the > attachment or get the document at: > http://www.analog.com/UploadedFiles/Associated_Docs/61460151169789ADSP_BF54x_Blackfin_Processor_Peripheral_Hardware_Reference.pdf > Ok, but this just means the controller wasn't designed with 4-bit MMC in mind. As several other "SD-only" controller have been tested with modern MMC cards without a problem, this is not sufficient to explain any problem. > > Thanks, actually we are not yet convinced by our hardware designer > why BF54x SDH does not support 4-bit MMC. > Please keep me informed on how it progresses. I'd like an at least plausible explanation, preferably also some empirical data, before I'm ready to accept Mike's patch. Rgds -- -- Pierre Ossman Linux kernel, MMC maintainer http://www.kernel.org PulseAudio, core developer http://pulseaudio.org rdesktop, core developer http://www.rdesktop.org -- 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/