[RFC/RFT] MMC: CORE: eMMC in Sleep mode before suspend

[Balaji T K <balajitk@ti.com>]

Put MMC to sleep if it supports SLEEP/AWAKE (CMD5)
in the mmc suspend to minimize power consumption.

Signed-off-by: Balaji T K <balajitk@ti.com>
---
 drivers/mmc/core/mmc.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index afabdc3..e8dfcde 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -900,16 +900,20 @@ 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