From: Asutosh Das <asutoshd@xxxxxxxxxxxxxx>
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 <sthumma@xxxxxxxxxxxxxx>
Signed-off-by: Asutosh Das <asutoshd@xxxxxxxxxxxxxx>
Signed-off-by: Venkat Gopalakrishnan <venkatg@xxxxxxxxxxxxxx>
[subhashj@xxxxxxxxxxxxxx: fixed trivial merge conflicts]
Signed-off-by: Subhash Jadavani <subhashj@xxxxxxxxxxxxxx>
Signed-off-by: Ritesh Harjani <riteshh@xxxxxxxxxxxxxx>
---
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 */
--
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