From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Cohen Subject: Re: [RFC/PATCH 0/2] mmc: sdhci: Workaround Intel Merrifield issue for HS200 Date: Tue, 12 Nov 2013 13:49:09 -0800 Message-ID: <5282A255.5090904@linux.intel.com> References: <1383069507-27574-1-git-send-email-david.a.cohen@linux.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mga09.intel.com ([134.134.136.24]:60289 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757182Ab3KLVoj (ORCPT ); Tue, 12 Nov 2013 16:44:39 -0500 In-Reply-To: <1383069507-27574-1-git-send-email-david.a.cohen@linux.intel.com> Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-mmc@vger.kernel.org To: cjb@laptop.org Cc: adrian.hunter@intel.com, gregkh@linuxfoundation.org, linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, chuanxiao.dong@intel.com On 10/29/2013 10:58 AM, David Cohen wrote: > Hi, > > SDHCI used to work well on Intel Merrifield until this patch was applied: > > commit 156e14b126ffb6f040bc6f1aff3c51077e42a744 > Author: Giuseppe CAVALLARO > Date: Wed Jun 12 08:16:38 2013 +0200 > > mmc: sdhci: fix caps2 for HS200 > > Although the HC supports HS200 (eMMC) the caps2 are always zero; this > means there's no way to use the super speed mode (when init the card). > > If the HC support SDR104, for SD3.0, so it also supports HS200 for eMMC > and this patch just sets the MMC_CAP2_HS200 in the host caps2 field. > > Looks like there is a hw issue with unknown root cause so far. > > Is it acceptable to have the quirk I'm proposing to workaround the issue? Ping. Any comments here? Br, David Cohen