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mmc: retry CMD1 in mmc_send_op_cond() until the eMMC is ready

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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>
This commit is contained in:
Haibo Chen 2020-06-15 17:18:12 +08:00 committed by Peng Fan
parent ba61676ff9
commit fe95905ffe
1 changed files with 8 additions and 1 deletions
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9
drivers/mmc/mmc.c
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@ -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;