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Commit c3805467 authored by Balaji T K's avatar Balaji T K Committed by Chris Ball
Browse files

mmc: core: Put eMMC in Sleep mode before suspend 



Put MMC to sleep if it supports SLEEP/AWAKE (CMD5) in the mmc suspend
so that Vcc (NAND core) can be cut to minimize power consumption.
eMMC put into SLEEP can respond to CMD0 or H/W reset or CMD5.
Current implemention on resume from suspend relies on CMD0 in
mmc_init_card to get out of SLEEP mode.

Signed-off-by: default avatarBalaji T K <balajitk@ti.com>
Acked-by: default avatarVenkatraman S <svenkatr@ti.com>
Reviewed-by: default avatarSubhash Jadavani <subhashj@codeaurora.org>
Acked-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: default avatarChris Ball <cjb@laptop.org>
parent 6fe47179

drivers/mmc/core/mmc.c

+7 −2
Original line number Diff line number Diff line
@@ -553,6 +553,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr, 
	 * need to tell some cards to go back to the idle

	 * state.  We wait 1ms to give cards time to

	 * respond.

	 * mmc_go_idle is needed for eMMC that are asleep

	 */

	mmc_go_idle(host);
@@ -900,16 +901,20 @@ static void mmc_detect(struct mmc_host *host) 
 */

static int mmc_suspend(struct mmc_host *host)

{

	int err = 0;



	BUG_ON(!host);

	BUG_ON(!host->card);



	mmc_claim_host(host);

	if (!mmc_host_is_spi(host))

	if (mmc_card_can_sleep(host))

		err = mmc_card_sleep(host);

	else if (!mmc_host_is_spi(host))

		mmc_deselect_cards(host);

	host->card->state &= ~MMC_STATE_HIGHSPEED;

	mmc_release_host(host);



	return 0;

	return err;

}



/*