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mmc: Retry the switch command

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Some eMMC will fail at the first switch, but would succeed in a subsequent
one.

Make sure we try several times to cover those cases. The number of retries
(and the behaviour) is currently what is being used in Linux.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
This commit is contained in:
Maxime Ripard 2016-11-04 16:18:08 +01:00 committed by Jaehoon Chung
parent 29e0cfb4f7
commit a9003dc641
1 changed files with 11 additions and 4 deletions
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15
drivers/mmc/mmc.c
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@ -494,6 +494,7 @@ int mmc_switch(struct mmc *mmc, u8 set, u8 index, u8 value)
{
struct mmc_cmd cmd;
int timeout = 1000;
int retries = 3;
int ret;
cmd.cmdidx = MMC_CMD_SWITCH;
@ -502,11 +503,17 @@ int mmc_switch(struct mmc *mmc, u8 set, u8 index, u8 value)
(index << 16) |
(value << 8);
ret = mmc_send_cmd(mmc, &cmd, NULL);
while (retries > 0) {
ret = mmc_send_cmd(mmc, &cmd, NULL);
/* Waiting for the ready status */
if (!ret)
ret = mmc_send_status(mmc, timeout);
/* Waiting for the ready status */
if (!ret) {
ret = mmc_send_status(mmc, timeout);
return ret;
}
retries--;
}
return ret;