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@xxxxxx>
Acked-by: Venkatraman S <svenkatr@xxxxxx>
---
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 5700b1c..f73fcee 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;
}
/*
--
1.7.0.4
--
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