This patch adds CMD5 awake support for emmc. This will be used to awake emmc from suspend together with partial_init support to reduce resume latencies.
Signed-off-by: Ritesh Harjani <[email protected]> --- drivers/mmc/core/mmc.c | 26 +++++++++++++++++++++----- 1 file changed, 21 insertions(+), 5 deletions(-) diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index 7fd7228..83bcc86 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -1827,7 +1827,7 @@ static int mmc_can_sleep(struct mmc_card *card) return (card && card->ext_csd.rev >= 3); } -static int mmc_sleep(struct mmc_host *host) +static int mmc_sleepawake(struct mmc_host *host, bool sleep) { struct mmc_command cmd = {}; struct mmc_card *card = host->card; @@ -1837,13 +1837,16 @@ static int mmc_sleep(struct mmc_host *host) /* Re-tuning can't be done once the card is deselected */ mmc_retune_hold(host); - err = mmc_deselect_cards(host); - if (err) - goto out_release; + if (sleep) { + err = mmc_deselect_cards(host); + if (err) + goto out_release; + } cmd.opcode = MMC_SLEEP_AWAKE; cmd.arg = card->rca << 16; - cmd.arg |= 1 << 15; + if (sleep) + cmd.arg |= 1 << 15; /* * If the max_busy_timeout of the host is specified, validate it against @@ -1871,11 +1874,24 @@ static int mmc_sleep(struct mmc_host *host) if (!cmd.busy_timeout || !(host->caps & MMC_CAP_WAIT_WHILE_BUSY)) mmc_delay(timeout_ms); + if (!sleep) + err = mmc_select_card(card); + out_release: mmc_retune_release(host); return err; } +static int mmc_sleep(struct mmc_host *host) +{ + return mmc_sleepawake(host, true); +} + +static int mmc_awake(struct mmc_host *host) +{ + return mmc_sleepawake(host, false); +} + static int mmc_can_poweroff_notify(const struct mmc_card *card) { return card && -- The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.
