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mmc: Wait for card_busy before starting sdio requests 

Some sdio wifi chips will not work properly if we try to start new
sdio-rw requests while the device is signalling that it is busy.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Hans de Goede 2015-09-22 17:30:25 +02:00 committed by Ulf Hansson
parent de98c55682
commit 5d3f6ef04d
1 changed files with 17 additions and 0 deletions
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17
drivers/mmc/core/core.c
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@ -206,6 +206,23 @@ static void __mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
return;
}
/*
* For sdio rw commands we must wait for card busy otherwise some
* sdio devices won't work properly.
*/
if (mmc_is_io_op(mrq->cmd->opcode) && host->ops->card_busy) {
int tries = 500; /* Wait aprox 500ms at maximum */
while (host->ops->card_busy(host) && --tries)
mmc_delay(1);
if (tries == 0) {
mrq->cmd->error = -EBUSY;
mmc_request_done(host, mrq);
return;
}
}
host->ops->request(host, mrq);
}