Hi Balaji, > 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 <[email protected]> > Acked-by: Venkatraman S <[email protected]> > --- > 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; > }
Looks good to me: Reviewed-by: Subhash Jadavani <[email protected]> Thanks, Subhash > > /* > -- > 1.7.0.4 > > -- Sent by a consultant of the Qualcomm Innovation Center, Inc. The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum. -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
