From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ritesh Harjani Subject: [PATCH RFCv2 01/10] mmc: core: Add support to read command queue parameters Date: Mon, 27 Jun 2016 18:52:28 +0530 Message-ID: <1467033757-32498-2-git-send-email-riteshh@codeaurora.org> References: <1467033757-32498-1-git-send-email-riteshh@codeaurora.org> Return-path: In-Reply-To: <1467033757-32498-1-git-send-email-riteshh@codeaurora.org> Sender: linux-mmc-owner@vger.kernel.org To: ulf.hansson@linaro.org, linux-mmc@vger.kernel.org Cc: linux-arm-msm@vger.kernel.org, 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, shawn.lin@rock-chips.com, Subhash Jadavani , Ritesh Harjani List-Id: linux-arm-msm@vger.kernel.org From: Asutosh Das eMMC cards with EXT_CSD version >= 8, 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 Signed-off-by: Ritesh Harjani --- drivers/mmc/core/mmc.c | 15 +++++++++++++++ include/linux/mmc/card.h | 2 ++ include/linux/mmc/mmc.h | 2 ++ 3 files changed, 19 insertions(+) diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index 5d438ad..77734c8 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -585,6 +585,21 @@ 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 >= 8) { + 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_debug("%s: CMDQ supported: depth: %d\n", + mmc_hostname(card->host), + card->ext_csd.cmdq_depth); + } + } + /* 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..694c189 100644 --- a/include/linux/mmc/mmc.h +++ b/include/linux/mmc/mmc.h @@ -330,6 +330,8 @@ 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_SUPPORTED_MODE 493 /* RO */ #define EXT_CSD_TAG_UNIT_SIZE 498 /* RO */ #define EXT_CSD_DATA_TAG_SUPPORT 499 /* RO */ -- The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.