diff options
author | Ulf Hansson <ulf.hansson@linaro.org> | 2016-10-19 16:15:31 +0200 |
---|---|---|
committer | Ulf Hansson <ulf.hansson@linaro.org> | 2016-11-29 09:00:35 +0100 |
commit | 70562644f4ee15214986966720ffe82fad03e693 (patch) | |
tree | 2f7afc2628b9167d11b64e38a0c51c71f825b4c8 | |
parent | 716bdb8953c7cad649a62e3333bf59cdd177db3b (diff) | |
download | linux-70562644f4ee15214986966720ffe82fad03e693.tar.bz2 |
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>
-rw-r--r-- | drivers/mmc/core/mmc_ops.c | 30 |
1 files changed, 14 insertions, 16 deletions
diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c index a84a880c986f..481bbdbae6e7 100644 --- a/drivers/mmc/core/mmc_ops.c +++ b/drivers/mmc/core/mmc_ops.c @@ -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); } /** |