mmc: core: Put eMMC in Sleep mode before suspend (c3805467) · Commits · 戴 / test

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:

Balaji T K <balajitk@ti.com> Acked-by:

Venkatraman S <svenkatr@ti.com> Reviewed-by:

Subhash Jadavani <subhashj@codeaurora.org> Acked-by:

Adrian Hunter <adrian.hunter@intel.com> Signed-off-by:

Chris Ball <cjb@laptop.org>

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;
		}

		/*

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