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 <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;
> }
Looks good to me:
Reviewed-by: Subhash Jadavani <subhashj@xxxxxxxxxxxxxx>
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.
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