Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932552Ab0LCMQw (ORCPT ); Fri, 3 Dec 2010 07:16:52 -0500 Received: from mga02.intel.com ([134.134.136.20]:37652 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932355Ab0LCMQu convert rfc822-to-8bit (ORCPT ); Fri, 3 Dec 2010 07:16:50 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.59,292,1288594800"; d="scan'208,223";a="580223481" Date: Fri, 3 Dec 2010 20:13:38 +0800 From: Chuanxiao Dong To: linux-mmc@vger.kernel.org Cc: linux-kernel@vger.kernel.org, cjb@laptop.org, akpm@linux-foundation.org, arjan@linux.intel.com, alan@linux.intel.com, kmpark@infradead.org Subject: [PATCH v2 1/4]enable background operations for supported eMMC card Message-ID: <20101203121338.GB18655@intel.com> Reply-To: Chuanxiao Dong MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: 8BIT User-Agent: Mutt/1.5.19 (2009-01-05) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3253 Lines: 102 >From 984adc755cf2f7966a89e510a50f085e314fe347 Mon Sep 17 00:00:00 2001 From: Chuanxiao Dong Date: Mon, 22 Nov 2010 16:31:12 +0800 Subject: [PATCH 1/4] mmc: Enabled background operations feature if eMMC card supports Background operations is a new feature defined in eMMC4.41 standard. Since this feature is opertional for eMMC card, so driver only enable for those eMMC card which supports this feature Signed-off-by: Chuanxiao Dong --- drivers/mmc/core/mmc.c | 26 ++++++++++++++++++++++++++ include/linux/mmc/card.h | 2 ++ include/linux/mmc/mmc.h | 3 +++ 3 files changed, 31 insertions(+), 0 deletions(-) diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index 77f93c3..471ed82 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -310,6 +310,14 @@ static int mmc_read_ext_csd(struct mmc_card *card) ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]; card->ext_csd.trim_timeout = 300 * ext_csd[EXT_CSD_TRIM_MULT]; + + /* detect whether the eMMC card support BKOPS */ + if (ext_csd[EXT_CSD_BKOPS_SUPPORT] & 0x1) { + card->ext_csd.bkops = 1; + card->ext_csd.bkops_en = + ext_csd[EXT_CSD_BKOPS_EN]; + } + } if (ext_csd[EXT_CSD_ERASED_MEM_CONT]) @@ -484,6 +492,24 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr, } /* + * enable BKOPS if eMMC card supports. + */ + if (card->ext_csd.bkops) { + if (!card->ext_csd.bkops_en) { + err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, + EXT_CSD_BKOPS_EN, 1); + if (err && err != -EBADMSG) + goto free_card; + + if (err) { + card->ext_csd.bkops_en = 0; + err = 0; + } else + card->ext_csd.bkops_en = 1; + } + } + + /* * Activate high speed (if supported) */ if ((card->ext_csd.hs_max_dtr != 0) && diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h index 8ce0827..9b755cb 100644 --- a/include/linux/mmc/card.h +++ b/include/linux/mmc/card.h @@ -54,6 +54,8 @@ struct mmc_ext_csd { unsigned int sec_trim_mult; /* Secure trim multiplier */ unsigned int sec_erase_mult; /* Secure erase multiplier */ unsigned int trim_timeout; /* In milliseconds */ + unsigned int bkops:1; /* background support bit */ + unsigned int bkops_en:1; /* background enable bit */ }; struct sd_scr { diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h index 956fbd8..14f7813 100644 --- a/include/linux/mmc/mmc.h +++ b/include/linux/mmc/mmc.h @@ -251,6 +251,8 @@ struct _mmc_csd { * EXT_CSD fields */ +#define EXT_CSD_BKOPS_EN 163 /* R/W */ +#define EXT_CSD_BKOPS_START 164 /* W */ #define EXT_CSD_ERASE_GROUP_DEF 175 /* R/W */ #define EXT_CSD_ERASED_MEM_CONT 181 /* RO */ #define EXT_CSD_BUS_WIDTH 183 /* R/W */ @@ -266,6 +268,7 @@ struct _mmc_csd { #define EXT_CSD_SEC_ERASE_MULT 230 /* RO */ #define EXT_CSD_SEC_FEATURE_SUPPORT 231 /* RO */ #define EXT_CSD_TRIM_MULT 232 /* RO */ +#define EXT_CSD_BKOPS_SUPPORT 502 /* RO */ /* * EXT_CSD field definitions -- 1.6.6.1 -- 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/