diff options
author | Balaji T K <balajitk@ti.com> | 2011-09-08 22:08:39 +0530 |
---|---|---|
committer | Robert Marklund <robert.marklund@stericsson.com> | 2011-10-27 16:07:55 +0200 |
commit | 49f9b3db2a7f8da006949b256c7a9419671184bb (patch) | |
tree | 1663ffd905e44513e99f5edb97868d94425c5505 | |
parent | 4723eb54f478794401792dad5046ae807e36f82a (diff) |
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: 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>
Change-Id: I910a07fce263626e37421920c08e454412d8fb67
Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/33432
Reviewed-by: Ulf HANSSON <ulf.hansson@stericsson.com>
Tested-by: Ulf HANSSON <ulf.hansson@stericsson.com>
-rw-r--r-- | drivers/mmc/core/mmc.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index e746b672246..b74e6f14b3a 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -557,6 +557,7 @@ 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); @@ -905,16 +906,20 @@ 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; } /* |