From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chuanxiao Dong Subject: [PATCH v4 0/4]implement eMMC4.4 standard HW reset feature Date: Wed, 1 Dec 2010 20:48:42 +0800 Message-ID: <20101201124842.GA5421@intel.com> Reply-To: Chuanxiao Dong Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from mga03.intel.com ([143.182.124.21]:54579 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751417Ab0LAMvr (ORCPT ); Wed, 1 Dec 2010 07:51:47 -0500 Content-Disposition: inline Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-mmc@vger.kernel.org To: linux-mmc@vger.kernel.org Cc: linux-kernel@vger.kernel.org, cjb@laptop.org, arjan@linux.intel.com, alan@linux.intel.com, akpm@linux-foundation.org Hi, These are the version 4 patches to implement eMMC4.4 HW reset feature. Host controller can use this feature by trigger RST_n signal. To enable this, byte 162 of EXT_CSD register should be set. HW reset is implemented in mmc core layer and sdhci host layer, and it will be used after each reading/writing/erasing timeout error occures. change-log: This version change the way to detect timeout error conditions. Added a new routine mmc_handle_timeout_error to do this instead to do this in mmc_wait_for_req. Each timeout read/write/erase command can use this routine to do HW reset. patch1: enable HW reset capability if card support. patch2: add two new callback to implement HW reset in mmc core layer. In this patch, routine mmc_handle_timeout_error was added. patch3: implement hardware_reset callback for sdhci host. A new callback reset_emmc was defined which will be each sdhci host controller to implement separately. patch4: did a HW reset after each read/write/erase command. Thanks Chuanxiao