mirrors/u-boot
0
0
Fork 0
mirror of https://github.com/u-boot/u-boot.git synced 2024-12-02 00:53:29 +08:00
Code Issues Packages Projects Releases Wiki Activity

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

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/mmc/mmc.c
View File

@ -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;