[PATCH v2 1/3] mmc: Check support for TRIM operations

[Loic Poulain]

When secure/insecure TRIM operations are supported.
When used as erase command argument it applies the
erase operation to write blocks instead of erase
groups.

Signed-off-by: Loic Poulain <loic.poulain at linaro.org>
---
v2: Add mmc unit test change to the series

 drivers/mmc/mmc.c | 3 +++
 include/mmc.h     | 4 ++++
 2 files changed, 7 insertions(+)

diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index 210703ea46..e5f5ccb5f4 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -2432,6 +2432,9 @@ static int mmc_startup_v4(struct mmc *mmc)
 
 	mmc->wr_rel_set = ext_csd[EXT_CSD_WR_REL_SET];
 
+	mmc->can_trim =
+		!!(ext_csd[EXT_CSD_SEC_FEATURE] & EXT_CSD_SEC_FEATURE_TRIM_EN);
+
 	return 0;
 error:
 	if (mmc->ext_csd) {
diff --git a/include/mmc.h b/include/mmc.h
index 571fa625d0..f6e23625ca 100644
--- a/include/mmc.h
+++ b/include/mmc.h
@@ -241,6 +241,7 @@ static inline bool mmc_is_tuning_cmd(uint cmdidx)
 #define EXT_CSD_HC_WP_GRP_SIZE		221	/* RO */
 #define EXT_CSD_HC_ERASE_GRP_SIZE	224	/* RO */
 #define EXT_CSD_BOOT_MULT		226	/* RO */
+#define EXT_CSD_SEC_FEATURE		231	/* RO */
 #define EXT_CSD_GENERIC_CMD6_TIME       248     /* RO */
 #define EXT_CSD_BKOPS_SUPPORT		502	/* RO */
 
@@ -315,6 +316,8 @@ static inline bool mmc_is_tuning_cmd(uint cmdidx)
 #define EXT_CSD_WR_DATA_REL_USR		(1 << 0)	/* user data area WR_REL */
 #define EXT_CSD_WR_DATA_REL_GP(x)	(1 << ((x)+1))	/* GP part (x+1) WR_REL */
 
+#define EXT_CSD_SEC_FEATURE_TRIM_EN	(1 << 4) /* Support secure & insecure trim */
+
 #define R1_ILLEGAL_COMMAND		(1 << 22)
 #define R1_APP_CMD			(1 << 5)
 
@@ -687,6 +690,7 @@ struct mmc {
 	uint tran_speed;
 	uint legacy_speed; /* speed for the legacy mode provided by the card */
 	uint read_bl_len;
+	bool can_trim;
 #if CONFIG_IS_ENABLED(MMC_WRITE)
 	uint write_bl_len;
 	uint erase_grp_size;	/* in 512-byte sectors */
-- 
2.34.1