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Commit 716bdb89 authored by Ulf Hansson's avatar Ulf Hansson
Browse files

mmc: core: Factor out code related to polling in __mmc_switch() 



In yet another step of cleaning up __mmc_switch(), let's factor out the
code that deals with card busy polling.

Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
Acked-by: default avatarJaehoon Chung <jh80.chung@samsung.com>
Tested-by: default avatarJaehoon Chung <jh80.chung@samsung.com>
parent cb26ce06

drivers/mmc/core/mmc_ops.c

+59 −49
Original line number Diff line number Diff line
@@ -468,6 +468,63 @@ int mmc_switch_status(struct mmc_card *card) 
	return mmc_switch_status_error(card->host, status);

}



static int mmc_poll_for_busy(struct mmc_card *card, unsigned int timeout_ms,

			bool send_status, bool ignore_crc)

{

	struct mmc_host *host = card->host;

	int err;

	unsigned long timeout;

	u32 status = 0;

	bool expired = false;

	bool busy = false;



	/* We have an unspecified cmd timeout, use the fallback value. */

	if (!timeout_ms)

		timeout_ms = MMC_OPS_TIMEOUT_MS;



	/*

	 * In cases when not allowed to poll by using CMD13 or because we aren't

	 * capable of polling by using ->card_busy(), then rely on waiting the

	 * stated timeout to be sufficient.

	 */

	if (!send_status && !host->ops->card_busy) {

		mmc_delay(timeout_ms);

		return 0;

	}



	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.

		 */

		expired = time_after(jiffies, timeout);

		if (send_status) {

			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;

		}



		/* 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",

				mmc_hostname(host), __func__);

			return -ETIMEDOUT;

		}

	} while (R1_CURRENT_STATE(status) == R1_STATE_PRG || busy);



	err = mmc_switch_status_error(host, status);



	return err;

}



/**

 *	__mmc_switch - modify EXT_CSD register

 *	@card: the MMC card associated with the data transfer
@@ -489,11 +546,7 @@ int __mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value, 
	struct mmc_host *host = card->host;

	int err;

	struct mmc_command cmd = {0};

	unsigned long timeout;

	u32 status = 0;

	bool use_r1b_resp = use_busy_signal;

	bool expired = false;

	bool busy = false;



	mmc_retune_hold(host);
@@ -543,51 +596,8 @@ int __mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value, 
		goto out;

	}



	/* We have an unspecified cmd timeout, use the fallback value. */

	if (!timeout_ms)

		timeout_ms = MMC_OPS_TIMEOUT_MS;



	/*

	 * In cases when not allowed to poll by using CMD13 or because we aren't

	 * capable of polling by using ->card_busy(), then rely on waiting the

	 * stated timeout to be sufficient.

	 */

	if (!send_status && !host->ops->card_busy) {

		mmc_delay(timeout_ms);

		goto out;

	}



	/* Let's poll to find out when the command is completed. */

	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.

		 */

		expired = time_after(jiffies, timeout);

		if (send_status) {

			err = __mmc_send_status(card, &status, ignore_crc);

			if (err)

				goto out;

		}

		if (host->ops->card_busy) {

			if (!host->ops->card_busy(host))

				break;

			busy = true;

		}



		/* 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",

				mmc_hostname(host), __func__);

			err = -ETIMEDOUT;

			goto out;

		}

	} while (R1_CURRENT_STATE(status) == R1_STATE_PRG || busy);



	err = mmc_switch_status_error(host, status);

	/* Let's try to poll to find out when the command is completed. */

	err = mmc_poll_for_busy(card, timeout_ms, send_status, ignore_crc);

out:

	mmc_retune_release(host);