From: Ulf Hansson ulf.hansson@linaro.org
[ Upstream commit 6966e6094c6d594044ef1b740dd827e05881331c ]
When mmc_blk_card_busy() calls card_busy_detect() to poll for the card's state with CMD13, this is done without any delays in between the commands being sent.
Rather than fixing card_busy_detect() in this regards, let's instead convert into using the common __mmc_poll_for_busy(), which also helps us to avoid open-coding.
Signed-off-by: Ulf Hansson ulf.hansson@linaro.org Reviewed-by: Shawn Lin shawn.lin@rock-chips.com Link: https://lore.kernel.org/r/20210702134229.357717-4-ulf.hansson@linaro.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/mmc/core/block.c | 69 ++++++++++++++++---------------------- drivers/mmc/core/mmc_ops.c | 1 + 2 files changed, 30 insertions(+), 40 deletions(-)
diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c index c30d0ab15539..a9ad9f5fa949 100644 --- a/drivers/mmc/core/block.c +++ b/drivers/mmc/core/block.c @@ -98,6 +98,11 @@ static int max_devices; static DEFINE_IDA(mmc_blk_ida); static DEFINE_IDA(mmc_rpmb_ida);
+struct mmc_blk_busy_data { + struct mmc_card *card; + u32 status; +}; + /* * There is one mmc_blk_data per slot. */ @@ -417,42 +422,6 @@ static int mmc_blk_ioctl_copy_to_user(struct mmc_ioc_cmd __user *ic_ptr, return 0; }
-static int card_busy_detect(struct mmc_card *card, unsigned int timeout_ms, - u32 *resp_errs) -{ - unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms); - int err = 0; - u32 status; - - do { - bool done = time_after(jiffies, timeout); - - err = __mmc_send_status(card, &status, 5); - if (err) { - dev_err(mmc_dev(card->host), - "error %d requesting status\n", err); - return err; - } - - /* Accumulate any response error bits seen */ - if (resp_errs) - *resp_errs |= status; - - /* - * Timeout if the device never becomes ready for data and never - * leaves the program state. - */ - if (done) { - dev_err(mmc_dev(card->host), - "Card stuck in wrong state! %s status: %#x\n", - __func__, status); - return -ETIMEDOUT; - } - } while (!mmc_ready_for_data(status)); - - return err; -} - static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md, struct mmc_blk_ioc_data *idata) { @@ -1852,28 +1821,48 @@ static inline bool mmc_blk_rq_error(struct mmc_blk_request *brq) brq->data.error || brq->cmd.resp[0] & CMD_ERRORS; }
+static int mmc_blk_busy_cb(void *cb_data, bool *busy) +{ + struct mmc_blk_busy_data *data = cb_data; + u32 status = 0; + int err; + + err = mmc_send_status(data->card, &status); + if (err) + return err; + + /* Accumulate response error bits. */ + data->status |= status; + + *busy = !mmc_ready_for_data(status); + return 0; +} + static int mmc_blk_card_busy(struct mmc_card *card, struct request *req) { struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req); - u32 status = 0; + struct mmc_blk_busy_data cb_data; int err;
if (mmc_host_is_spi(card->host) || rq_data_dir(req) == READ) return 0;
- err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, &status); + cb_data.card = card; + cb_data.status = 0; + err = __mmc_poll_for_busy(card, MMC_BLK_TIMEOUT_MS, &mmc_blk_busy_cb, + &cb_data);
/* * Do not assume data transferred correctly if there are any error bits * set. */ - if (status & mmc_blk_stop_err_bits(&mqrq->brq)) { + if (cb_data.status & mmc_blk_stop_err_bits(&mqrq->brq)) { mqrq->brq.data.bytes_xfered = 0; err = err ? err : -EIO; }
/* Copy the exception bit so it will be seen later on */ - if (mmc_card_mmc(card) && status & R1_EXCEPTION_EVENT) + if (mmc_card_mmc(card) && cb_data.status & R1_EXCEPTION_EVENT) mqrq->brq.cmd.resp[0] |= R1_EXCEPTION_EVENT;
return err; diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c index e2c431c0ce5d..90d213a2203f 100644 --- a/drivers/mmc/core/mmc_ops.c +++ b/drivers/mmc/core/mmc_ops.c @@ -510,6 +510,7 @@ int __mmc_poll_for_busy(struct mmc_card *card, unsigned int timeout_ms,
return 0; } +EXPORT_SYMBOL_GPL(__mmc_poll_for_busy);
int mmc_poll_for_busy(struct mmc_card *card, unsigned int timeout_ms, bool retry_crc_err, enum mmc_busy_cmd busy_cmd)