diff options
| author | Asutosh Das <asutoshd@codeaurora.org> | 2014-03-21 11:14:51 +0530 |
|---|---|---|
| committer | Subhash Jadavani <subhashj@codeaurora.org> | 2016-05-31 15:26:21 -0700 |
| commit | f4a166292806342ea74935954a493650ec2cface (patch) | |
| tree | d222096c556362a29ee244ed57304d731f2e4e3f | |
| parent | a4a793c49e19f3c4a042e99297cb2f2d8792cb2a (diff) | |
mmc: core: Add support to read command queue parameters
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.
Change-Id: I9454d0d6997ccbd1778a147354859467f4a9a7d3
Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org>
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>
[subhashj@codeaurora.org: fixed trivial merge conflicts]
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
| -rw-r--r-- | drivers/mmc/core/mmc.c | 18 | ||||
| -rw-r--r-- | include/linux/mmc/card.h | 2 | ||||
| -rw-r--r-- | include/linux/mmc/mmc.h | 3 |
3 files changed, 23 insertions, 0 deletions
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index ab1a7dc872c5..d08629b4c385 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -612,6 +612,24 @@ 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 c3e6fbfbcfab..59ef4e717beb 100644 --- a/include/linux/mmc/card.h +++ b/include/linux/mmc/card.h @@ -119,6 +119,8 @@ 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 6f5b437311c2..a85e7e3f9bb6 100644 --- a/include/linux/mmc/mmc.h +++ b/include/linux/mmc/mmc.h @@ -273,6 +273,9 @@ 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 */ |