Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754661Ab0LIIPb (ORCPT ); Thu, 9 Dec 2010 03:15:31 -0500 Received: from cantor2.suse.de ([195.135.220.15]:47959 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754305Ab0LIIPa (ORCPT ); Thu, 9 Dec 2010 03:15:30 -0500 Date: Thu, 09 Dec 2010 09:15:27 +0100 Message-ID: From: Takashi Iwai To: zhangfei gao Cc: Chris Ball , linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, Aries Lee , Wolfram Sang Subject: Re: [PATCH v2] mmc: Add support for JMicron 388 SD/MMC controller In-Reply-To: References: User-Agent: Wanderlust/2.15.6 (Almost Unreal) SEMI/1.14.6 (Maruoka) FLIM/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL/10.7 Emacs/23.2 (x86_64-suse-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI 1.14.6 - "Maruoka") Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1256 Lines: 32 At Wed, 8 Dec 2010 21:18:38 -0500, zhangfei gao wrote: > > On Wed, Dec 8, 2010 at 4:04 AM, Takashi Iwai wrote: > > JMicron 388 SD/MMC combo controller supports the 1.8V low-voltage for > > SD, but MMC doesn't work with the low-voltage, resulting in an error > > at probing. > > > > This patch adds the support for multiple voltage mask per device type, > > so that SD works with 1.8V while MMC forces 3.3V.  Here new ocr_avail_* > > fields for each device are introduced, so that the actual OCR mask is > > switched dynamically. > > It is great that you also have 1.8v requirement, could you help share some info? > What's the card you are using, mmc or sd, if sd, does cmd11 is required? > Which component will provide voltage in your platform, external pmic > or controller? > What's the init voltage, 3.3v? and then switch to 1.8v, does some time > required to wait voltage to be stable? I guess Aries can answer to these at best :) 1.8V case was tested mainly by him. thanks, Takashi -- 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/