From patchwork Wed Jun 15 13:01:05 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ritesh Harjani X-Patchwork-Id: 9178497 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 0207E6021C for ; Wed, 15 Jun 2016 13:02:29 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E783D2012F for ; Wed, 15 Jun 2016 13:02:28 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id DC10D27E33; Wed, 15 Jun 2016 13:02:28 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id DC50C2012F for ; Wed, 15 Jun 2016 13:02:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932732AbcFONCP (ORCPT ); Wed, 15 Jun 2016 09:02:15 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:43596 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932718AbcFONCM (ORCPT ); Wed, 15 Jun 2016 09:02:12 -0400 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 01FE1613FD; Wed, 15 Jun 2016 13:02:12 +0000 (UTC) Received: from rharjani-linux.qualcomm.com (unknown [202.46.23.54]) (using TLSv1.1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: riteshh@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 7EE0661369; Wed, 15 Jun 2016 13:02:06 +0000 (UTC) From: Ritesh Harjani To: ulf.hansson@linaro.org, linux-mmc@vger.kernel.org Cc: adrian.hunter@intel.com, alex.lemberg@sandisk.com, mateusz.nowak@intel.com, Yuliy.Izrailov@sandisk.com, jh80.chung@samsung.com, dongas86@gmail.com, asutoshd@codeaurora.org, zhangfei.gao@gmail.com, sthumma@codeaurora.org, kdorfman@codeaurora.org, david.griego@linaro.org, stummala@codeaurora.org, venkatg@codeaurora.org, Subhash Jadavani Subject: [PATCH RFC 01/10] mmc: core: Add support to read command queue parameters Date: Wed, 15 Jun 2016 18:31:05 +0530 Message-Id: <1465995674-15816-2-git-send-email-riteshh@codeaurora.org> X-Mailer: git-send-email 1.8.2.1 In-Reply-To: <1465995674-15816-1-git-send-email-riteshh@codeaurora.org> References: <1465995674-15816-1-git-send-email-riteshh@codeaurora.org> Sender: linux-mmc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Asutosh Das eMMC cards with EXT_CSD version >= 7, optionally support command queuing feature as defined by JEDEC eMMC5.1. Add support for probing command queue feature for such type of cards. Signed-off-by: Sujit Reddy Thumma Signed-off-by: Asutosh Das Signed-off-by: Venkat Gopalakrishnan [subhashj@codeaurora.org: fixed trivial merge conflicts] Signed-off-by: Subhash Jadavani --- drivers/mmc/core/mmc.c | 18 ++++++++++++++++++ include/linux/mmc/card.h | 2 ++ include/linux/mmc/mmc.h | 3 +++ 3 files changed, 23 insertions(+) diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index 4dbe3df..ff560e9 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -578,6 +578,24 @@ static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd) card->ext_csd.data_sector_size = 512; } + if (card->ext_csd.rev >= 7) { + card->ext_csd.cmdq_support = ext_csd[EXT_CSD_CMDQ_SUPPORT]; + if (card->ext_csd.cmdq_support) { + /* + * Queue Depth = N + 1, + * see JEDEC JESD84-B51 section 7.4.19 + */ + card->ext_csd.cmdq_depth = + ext_csd[EXT_CSD_CMDQ_DEPTH] + 1; + pr_info("%s: CMDQ supported: depth: %d\n", + mmc_hostname(card->host), + card->ext_csd.cmdq_depth); + } + } else { + card->ext_csd.cmdq_support = 0; + card->ext_csd.cmdq_depth = 0; + } + /* eMMC v5 or later */ if (card->ext_csd.rev >= 7) { memcpy(card->ext_csd.fwrev, &ext_csd[EXT_CSD_FIRMWARE_VERSION], diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h index eb0151b..f74db84 100644 --- a/include/linux/mmc/card.h +++ b/include/linux/mmc/card.h @@ -118,6 +118,8 @@ struct mmc_ext_csd { u8 raw_pwr_cl_ddr_200_360; /* 253 */ u8 raw_bkops_status; /* 246 */ u8 raw_sectors[4]; /* 212 - 4 bytes */ + u8 cmdq_depth; /* 307 */ + u8 cmdq_support; /* 308 */ unsigned int feature_support; #define MMC_DISCARD_FEATURE BIT(0) /* CMD38 feature */ diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h index 15f2c4a..1c0ae75 100644 --- a/include/linux/mmc/mmc.h +++ b/include/linux/mmc/mmc.h @@ -330,6 +330,9 @@ struct _mmc_csd { #define EXT_CSD_CACHE_SIZE 249 /* RO, 4 bytes */ #define EXT_CSD_PWR_CL_DDR_200_360 253 /* RO */ #define EXT_CSD_FIRMWARE_VERSION 254 /* RO, 8 bytes */ +#define EXT_CSD_CMDQ_DEPTH 307 /* RO */ +#define EXT_CSD_CMDQ_SUPPORT 308 /* RO */ + #define EXT_CSD_TAG_UNIT_SIZE 498 /* RO */ #define EXT_CSD_SUPPORTED_MODE 493 /* RO */ #define EXT_CSD_TAG_UNIT_SIZE 498 /* RO */ #define EXT_CSD_DATA_TAG_SUPPORT 499 /* RO */