Commit b4c9f938 authored by Douglas Anderson's avatar Douglas Anderson Committed by Ulf Hansson
Browse files

mmc: core: Add sdio_retune_hold_now() and sdio_retune_release() 



We want SDIO drivers to be able to temporarily stop retuning when the
driver knows that the SDIO card is not in a state where retuning will
work (maybe because the card is asleep).  We'll move the relevant
functions to a place where drivers can call them.

Cc: stable@vger.kernel.org #v4.18+
Signed-off-by: default avatarDouglas Anderson <dianders@chromium.org>
Acked-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Acked-by: default avatarKalle Valo <kvalo@codeaurora.org>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 2de0b42d

drivers/mmc/core/sdio_io.c

+40 −0
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ 
#include "sdio_ops.h"

#include "core.h"

#include "card.h"

#include "host.h"



/**

 *	sdio_claim_host - exclusively claim a bus for a certain SDIO function
@@ -771,3 +772,42 @@ void sdio_retune_crc_enable(struct sdio_func *func) 
	func->card->host->retune_crc_disable = false;

}

EXPORT_SYMBOL_GPL(sdio_retune_crc_enable);



/**

 *	sdio_retune_hold_now - start deferring retuning requests till release

 *	@func: SDIO function attached to host

 *

 *	This function can be called if it's currently a bad time to do

 *	a retune of the SDIO card.  Retune requests made during this time

 *	will be held and we'll actually do the retune sometime after the

 *	release.

 *

 *	This function could be useful if an SDIO card is in a power state

 *	where it can respond to a small subset of commands that doesn't

 *	include the retuning command.  Care should be taken when using

 *	this function since (presumably) the retuning request we might be

 *	deferring was made for a good reason.

 *

 *	This function should be called while the host is claimed.

 */

void sdio_retune_hold_now(struct sdio_func *func)

{

	mmc_retune_hold_now(func->card->host);

}

EXPORT_SYMBOL_GPL(sdio_retune_hold_now);



/**

 *	sdio_retune_release - signal that it's OK to retune now

 *	@func: SDIO function attached to host

 *

 *	This is the complement to sdio_retune_hold_now().  Calling this

 *	function won't make a retune happen right away but will allow

 *	them to be scheduled normally.

 *

 *	This function should be called while the host is claimed.

 */

void sdio_retune_release(struct sdio_func *func)

{

	mmc_retune_release(func->card->host);

}

EXPORT_SYMBOL_GPL(sdio_retune_release);

include/linux/mmc/sdio_func.h

+3 −0
Original line number Diff line number Diff line
@@ -170,4 +170,7 @@ extern int sdio_set_host_pm_flags(struct sdio_func *func, mmc_pm_flag_t flags); 
extern void sdio_retune_crc_disable(struct sdio_func *func);

extern void sdio_retune_crc_enable(struct sdio_func *func);



extern void sdio_retune_hold_now(struct sdio_func *func);

extern void sdio_retune_release(struct sdio_func *func);



#endif /* LINUX_MMC_SDIO_FUNC_H */

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