diff options
| author | Balaji T K <balajitk@ti.com> | 2011-09-08 22:08:39 +0530 |
|---|---|---|
| committer | Chris Ball <cjb@laptop.org> | 2011-10-26 15:43:42 -0400 |
| commit | c3805467aad7ce4e31c2b935046843de08cfc026 (patch) | |
| tree | aa7bba210472d7b071071b1f1c4619a647f1f1ac /drivers | |
| parent | 6fe47179a07009ee3ee7c8b962966fee420becc8 (diff) | |
| download | linux-c3805467aad7ce4e31c2b935046843de08cfc026.tar.bz2 | |
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>
Diffstat (limited to 'drivers')
| -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 5700b1cbdfec..f73fceea5dbd 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -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; } /* |