diff options
| author | Haibo Chen <haibo.chen@nxp.com> | 2020-06-15 17:18:12 +0800 |
|---|---|---|
| committer | Peng Fan <peng.fan@nxp.com> | 2020-06-24 14:05:30 +0800 |
| commit | fe95905ffed57d617cad81a71ac419d53aaa1ebf (patch) | |
| tree | 17704f7ef36ce51f9b1c8adb869de5e6fb0a3a06 /drivers | |
| parent | ba61676ff9f8225ebc0ea33ad9f48862e718fd01 (diff) | |
mmc: retry CMD1 in mmc_send_op_cond() until the eMMC is ready
According to eMMC specification v5.1 section 6.4.3, we should issue
CMD1 repeatedly in the idle state until the eMMC is ready even if
mmc_send_op_cond() send CMD1 with argument = 0. Otherwise some eMMC
devices seems to enter the inactive mode after mmc_complete_op_cond()
issued CMD0 when the eMMC device is busy.
Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mmc/mmc.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c index 620bb93064..725a36799d 100644 --- a/drivers/mmc/mmc.c +++ b/drivers/mmc/mmc.c @@ -669,12 +669,15 @@ static int mmc_send_op_cond_iter(struct mmc *mmc, int use_arg) static int mmc_send_op_cond(struct mmc *mmc) { int err, i; + int timeout = 1000; + uint start; /* Some cards seem to need this */ mmc_go_idle(mmc); + start = get_timer(0); /* Asking to the card its capabilities */ - for (i = 0; i < 2; i++) { + for (i = 0; ; i++) { err = mmc_send_op_cond_iter(mmc, i != 0); if (err) return err; @@ -682,6 +685,10 @@ static int mmc_send_op_cond(struct mmc *mmc) /* exit if not busy (flag seems to be inverted) */ if (mmc->ocr & OCR_BUSY) break; + + if (get_timer(start) > timeout) + return -ETIMEDOUT; + udelay(100); } mmc->op_cond_pending = 1; return 0; |