Commit 7ff27609 authored by Adrian Hunter's avatar Adrian Hunter Committed by Ulf Hansson
Browse files

mmc: core: Add a facility to "pause" re-tuning 



Re-tuning is not possible when switched to the RPMB
partition.  However re-tuning should not be needed
if re-tuning is done immediately before switching,
a small set of operations is done, and then we
immediately switch back to the main partition.

To ensure that re-tuning can't be done for a short
while, add a facility to "pause" re-tuning.

The existing facility to hold / release re-tuning
is used but it also flags re-tuning as needed to cause
re-tuning before the next command (which will be the
switch to RPMB).

We also need to "unpause" in the recovery path, which
is catered for by adding it to mmc_retune_disable().

Signed-off-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 16490980

drivers/mmc/core/host.c

+24 −0
Original line number Diff line number Diff line
@@ -68,8 +68,32 @@ void mmc_retune_enable(struct mmc_host *host) 
			  jiffies + host->retune_period * HZ);

}



/*

 * Pause re-tuning for a small set of operations.  The pause begins after the

 * next command and after first doing re-tuning.

 */

void mmc_retune_pause(struct mmc_host *host)

{

	if (!host->retune_paused) {

		host->retune_paused = 1;

		mmc_retune_needed(host);

		mmc_retune_hold(host);

	}

}

EXPORT_SYMBOL(mmc_retune_pause);



void mmc_retune_unpause(struct mmc_host *host)

{

	if (host->retune_paused) {

		host->retune_paused = 0;

		mmc_retune_release(host);

	}

}

EXPORT_SYMBOL(mmc_retune_unpause);



void mmc_retune_disable(struct mmc_host *host)

{

	mmc_retune_unpause(host);

	host->can_retune = 0;

	del_timer_sync(&host->retune_timer);

	host->retune_now = 0;

include/linux/mmc/host.h

+4 −0
Original line number Diff line number Diff line
@@ -329,6 +329,7 @@ struct mmc_host { 
	unsigned int		can_retune:1;	/* re-tuning can be used */

	unsigned int		doing_retune:1;	/* re-tuning in progress */

	unsigned int		retune_now:1;	/* do re-tuning at next req */

	unsigned int		retune_paused:1; /* re-tuning is temporarily disabled */



	int			rescan_disable;	/* disable card detection */

	int			rescan_entered;	/* used with nonremovable devices */
@@ -526,4 +527,7 @@ static inline void mmc_retune_recheck(struct mmc_host *host) 
		host->retune_now = 1;

}



void mmc_retune_pause(struct mmc_host *host);

void mmc_retune_unpause(struct mmc_host *host);



#endif /* LINUX_MMC_HOST_H */

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