mmc: Check support for TRIM operations

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@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>

diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index dde251c..1af6af8 100644 (file)
--- 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 36dd841..b8fbff1 100644 (file)
--- 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 */