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mmc: core: Don't use ->card_busy() and CMD13 in combination when polling 

When polling for busy after sending a MMC_SWITCH command, both the optional
->card_busy() callback and CMD13 are being used in conjunction.

This doesn't make sense. Instead it's more reasonable to rely solely on the
->card_busy() callback when it exists. Let's change that and instead use
the CMD13 as a fall-back. In this way we avoid sending CMD13, unless it's
really needed.

Within this context, let's also take the opportunity to make some
additional clean-ups and clarifications to the related code.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Tested-by: Jaehoon Chung <jh80.chung@samsung.com>
This commit is contained in:
Ulf Hansson 2016-10-19 16:15:31 +02:00
parent 716bdb8953
commit 70562644f4
1 changed files with 14 additions and 16 deletions
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30
drivers/mmc/core/mmc_ops.c
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@ -495,34 +495,32 @@ static int mmc_poll_for_busy(struct mmc_card *card, unsigned int timeout_ms,
timeout = jiffies + msecs_to_jiffies(timeout_ms) + 1;
do {
/*
* Due to the possibility of being preempted after
* sending the status command, check the expiration
* time first.
* Due to the possibility of being preempted while polling,
* check the expiration time first.
*/
expired = time_after(jiffies, timeout);
if (send_status) {
if (host->ops->card_busy) {
busy = host->ops->card_busy(host);
} else {
err = __mmc_send_status(card, &status, ignore_crc);
if (err)
return err;
}
if (host->ops->card_busy) {
if (!host->ops->card_busy(host))
break;
busy = true;
busy = R1_CURRENT_STATE(status) == R1_STATE_PRG;
}
/* Timeout if the device never leaves the program state. */
if (expired &&
(R1_CURRENT_STATE(status) == R1_STATE_PRG || busy)) {
pr_err("%s: Card stuck in programming state! %s\n",
/* Timeout if the device still remains busy. */
if (expired && busy) {
pr_err("%s: Card stuck being busy! %s\n",
mmc_hostname(host), __func__);
return -ETIMEDOUT;
}
} while (R1_CURRENT_STATE(status) == R1_STATE_PRG || busy);
} while (busy);
err = mmc_switch_status_error(host, status);
if (host->ops->card_busy && send_status)
return mmc_switch_status(card);
return err;
return mmc_switch_status_error(host, status);
}
/**