On 26 May 2015 at 15:44, Avi Shchislowski <Avi.Shchislowski@xxxxxxxxxxx> wrote:
> This patch is implements the new additional state of
> Power_Off_Notification - SLEEP_NOTIFICATION.
> Until now, the implementation of Power_Off_Notification
> supported only three modes - POWERED_ON (0x01),
> POWER_OFF_SHORT (0x02) and POWER_OFF_LONG (0x03).
>
> As part of eMMC5.0 before moving to Sleep state hosts may set the
> POWER_OFF_NOTIFICATION byte to SLEEP_NOTIFICATION (0x04).
> After setting SLEEP_NOTIFICATION, host should wait for
> the busy line to be de-asserted.
> The max timeout allowed for busy line de-assertion defined
> in SLEEP_NOTIFICATION_TIME byte in EXT_CSD [216].
> HPI may interrupt the SLEEP_NOTIFICATION operation.
> In that case POWER_OFF_NOTIFICATION byte will restore to POWERED_ON.
>
> Signed-off-by: Alex Lemberg <alex.lemberg@xxxxxxxxxxx>
> Signed-off-by: Avi Shchislowski <avi.shchislowski@xxxxxxxxxxx>
This is a great improvement according to earlier version.
Still you have some things to do before I am satisfied...
> ---------
> v2:
> - remove calling mmc_interrupt_hpi in case the device is doing
> sleep notification from block.c
> - remove call of "mmc_card_doing_sleep_notify" from core.c
> - mmc_sleep_notify changed to static function
>
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index a802863..2bf2b2c 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -59,6 +59,12 @@ static const unsigned int tacc_mant[] = {
> __res & __mask; \
> })
>
> +#define MMC_SLEEP_NOTIFY_MAX_TIME 0x17
This doesn't tell me much. Could we have the value in ms, or whatever
that makes sense?
> +#define GET_SLEEP_NOTIFY_TIME(value) \
> + (10 * (1 << (unsigned int)(value)))
> +#define GET_SLEEP_NOTIFY_TIME_MSEC(value) \
> + (DIV_ROUND_UP(GET_SLEEP_NOTIFY_TIME(value), 1000))
Please remove these two macros. Do the calculations where needed instead.
> +
> /*
> * Given the decoded CSD structure, decode the raw CID to our CID structure.
> */
> @@ -582,6 +588,8 @@ static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd)
> card->ext_csd.ffu_capable =
> (ext_csd[EXT_CSD_SUPPORTED_MODE] & 0x1) &&
> !(ext_csd[EXT_CSD_FW_CONFIG] & 0x1);
> + card->ext_csd.sleep_notify_time =
> + ext_csd[EXT_CSD_SLEEP_NOTIFICATION_TIME];
> }
> out:
> return err;
> @@ -1529,6 +1537,15 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
> card->ext_csd.hpi_en = 1;
> }
>
> + /* sleep notify enable/disable for eMMC 5.0 and above */
> + if ((card->ext_csd.rev >= 7) && card->ext_csd.hpi_en &&
Why depend on hpi_en here? Is that according to the specification?
> + (card->host->caps2 & MMC_CAP2_SLEEP_NOTIFY) &&
We don't need a new MMC_CAP2 for this, please remove it.
> + card->ext_csd.sleep_notify_time > 0 &&
> + card->ext_csd.sleep_notify_time <=
> + MMC_SLEEP_NOTIFY_MAX_TIME) {
> + card->can_sleep_notify = 1;
Finally, I don't think the above calculations and if statements is
that much of an issue to do at each suspend. So please move this
entire thing into a helper function instead and thus remove the new
member "can_sleep_notify".
Similar as mmc_can_poweroff_notify().
> + }
> +
> /*
> * If cache size is higher than 0, this indicates
> * the existence of cache and it can be turned on.
> @@ -1642,6 +1659,33 @@ out_release:
> return err;
> }
>
> +/*
> + * check if device is in program state (busy)
> + */
> +static bool mmc_device_prg_state(struct mmc_card *card)
> +{
> + int rc;
> + u32 status;
> + bool state;
> +
> + mmc_get_card(card);
> + rc = mmc_send_status(card, &status);
> + if (rc) {
> + pr_err("%s: Get card status fail. rc=%d\n",
> + mmc_hostname(card->host), rc);
> + state = false;
> + goto out;
> + }
> +
> + if (R1_CURRENT_STATE(status) == R1_STATE_PRG)
> + state = true;
> + else
> + state = false;
> +out:
> + mmc_put_card(card);
> + return state;
> +}
> +
> static int mmc_can_poweroff_notify(const struct mmc_card *card)
> {
> return card &&
> @@ -1653,20 +1697,106 @@ static int mmc_poweroff_notify(struct mmc_card *card, unsigned int notify_type)
> {
> unsigned int timeout = card->ext_csd.generic_cmd6_time;
> int err;
> + bool use_busy_signal;
>
> /* Use EXT_CSD_POWER_OFF_SHORT as default notification type. */
> if (notify_type == EXT_CSD_POWER_OFF_LONG)
> timeout = card->ext_csd.power_off_longtime;
> + else if (notify_type == EXT_CSD_SLEEP_NOTIFICATION) {
> + /* calculate the maximum timeout for the
> + * switch command when notifying the device
> + * that it is about to move to sleep */
> + timeout = GET_SLEEP_NOTIFY_TIME_MSEC(
> + card->ext_csd.sleep_notify_time);
> + }
>
> + /* do not wait on busy signal in case of
> + * Sleep Notification - to let host get
> + * another requests
> + */
There will be no other requests executed in this path, so the upper
comment just doesn't make sense.
I guess you are trying to prepare for using HPI to interrupt sleep
notification from runtime PM resume? If that is the case, please don't
make that code a part of this patch. Instead add that functionality on
top of this patch.
> + use_busy_signal = (notify_type == EXT_CSD_SLEEP_NOTIFICATION) ?
> + false : true;
> err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
> EXT_CSD_POWER_OFF_NOTIFICATION,
> - notify_type, timeout, true, false, false);
> - if (err)
> + notify_type, timeout,
> + use_busy_signal, false, false);
> + if (!err) {
> + card->ext_csd.power_off_notification = notify_type;
> + } else {
> pr_err("%s: Power Off Notification timed out, %u\n",
> - mmc_hostname(card->host), timeout);
> + mmc_hostname(card->host), timeout);
> + }
>
> - /* Disable the power off notification after the switch operation. */
> - card->ext_csd.power_off_notification = EXT_CSD_NO_POWER_NOTIFICATION;
> + return err;
> +}
> +
> +static int mmc_sleep_notify(struct mmc_card *card)
> +{
> + int err = 0;
> + bool is_busy = 0;
> + unsigned long prg_wait = 0;
> +
> + if (!card->can_sleep_notify || !mmc_can_poweroff_notify(card))
> + return 0;
> +
> + if (!mmc_card_doing_sleep_notify(card)) {
> + mmc_get_card(card);
> + mmc_card_set_sleep_notify(card);
> + err = mmc_poweroff_notify(card,
> + EXT_CSD_SLEEP_NOTIFICATION);
> + mmc_put_card(card);
> + if (err) {
> + pr_err("%s: mmc_poweroff_notify failed with %d\n",
> + __func__, err);
> + goto out;
> + }
> +
> + prg_wait = jiffies +
> + msecs_to_jiffies(GET_SLEEP_NOTIFY_TIME_MSEC(
> + card->ext_csd.sleep_notify_time));
> + }
> +
> + /*
> + * Loop will run until:
> + * 1. Device is no more in Busy state
> + * 2. Sleep notification is not interrupted by HPI & IO request
> + */
As stated earlier. I don't want this patch to consider the above
options at this point. Please remove all related code from this patch.
> + do {
> + /* added some delay to avoid sending card status too often */
> + msleep(20);
> + err = 0;
> + /* Stop polling in case sleep notification was HPIed already */
> + if (!mmc_card_doing_sleep_notify(card)) {
> + is_busy = mmc_device_prg_state(card);
> + if (is_busy)
> + err = -EBUSY;
> + break;
> + }
> + is_busy = mmc_device_prg_state(card);
> + if (is_busy && time_after(jiffies, prg_wait)) {
> + /*
> + * making sure we are still in busy before
> + * sending HPI due to timeout error
> + */
> + is_busy = mmc_device_prg_state(card);
> + if (is_busy) {
> + if (mmc_card_doing_sleep_notify(card)) {
> + card->ext_csd.power_off_notification =
> + EXT_CSD_POWER_ON;
> + mmc_interrupt_hpi(card);
> + }
> + err = -ETIMEDOUT;
> + break;
> + }
> + }
> + } while (is_busy);
> +
> +out:
> + mmc_card_clr_sleep_notify(card);
> + if (err) {
> + pr_err("%s: mmc_poweroff_notify for sleep failed with %d\n",
> + mmc_hostname(card->host), err);
> + }
>
> return err;
> }
> @@ -1745,8 +1875,16 @@ static int _mmc_suspend(struct mmc_host *host, bool is_suspend)
> goto out;
>
> if (mmc_can_poweroff_notify(host->card) &&
> - ((host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) || !is_suspend))
> - err = mmc_poweroff_notify(host->card, notify_type);
> + ((host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) || !is_suspend)) {
> + if (!host->card->can_sleep_notify ||
> + !mmc_can_poweroff_notify(host->card)) {
This looks wrong.
The outer "if" already checked "if (mmc_can_poweroff_notify(host->card)".
> + err = mmc_poweroff_notify(host->card, notify_type);
> + } else {
> + err = mmc_sleep_notify(host->card);
> + if (err != -ETIMEDOUT)
> + err = mmc_sleep(host);
> + }
> + }
> else if (mmc_can_sleep(host->card))
> err = mmc_sleep(host);
> else if (!mmc_host_is_spi(host))
> diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
> index 19f0175..ed91e6f 100644
> --- a/include/linux/mmc/card.h
> +++ b/include/linux/mmc/card.h
> @@ -62,6 +62,7 @@ struct mmc_ext_csd {
> unsigned int sa_timeout; /* Units: 100ns */
> unsigned int generic_cmd6_time; /* Units: 10ms */
> unsigned int power_off_longtime; /* Units: ms */
> + unsigned int sleep_notify_time; /* Units: us */
> u8 power_off_notification; /* state */
> unsigned int hs_max_dtr;
> unsigned int hs200_max_dtr;
> @@ -262,6 +263,7 @@ struct mmc_card {
> #define MMC_CARD_REMOVED (1<<4) /* card has been removed */
> #define MMC_STATE_DOING_BKOPS (1<<5) /* card is doing BKOPS */
> #define MMC_STATE_SUSPENDED (1<<6) /* card is suspended */
> +#define MMC_STATE_SLEEP_NOTIFY (1<<7) /* card in sleep notify */
> unsigned int quirks; /* card quirks */
> #define MMC_QUIRK_LENIENT_FN0 (1<<0) /* allow SDIO FN0 writes outside of the VS CCCR range */
> #define MMC_QUIRK_BLKSZ_FOR_BYTE_MODE (1<<1) /* use func->cur_blksize */
> @@ -309,6 +311,7 @@ struct mmc_card {
> struct dentry *debugfs_root;
> struct mmc_part part[MMC_NUM_PHY_PARTITION]; /* physical partitions */
> unsigned int nr_parts;
> + u8 can_sleep_notify; /* sleep_notify on/off */
> };
>
> /*
> @@ -427,6 +430,7 @@ static inline void __maybe_unused remove_quirk(struct mmc_card *card, int data)
> #define mmc_card_removed(c) ((c) && ((c)->state & MMC_CARD_REMOVED))
> #define mmc_card_doing_bkops(c) ((c)->state & MMC_STATE_DOING_BKOPS)
> #define mmc_card_suspended(c) ((c)->state & MMC_STATE_SUSPENDED)
> +#define mmc_card_doing_sleep_notify(c) ((c)->state & MMC_STATE_SLEEP_NOTIFY)
>
> #define mmc_card_set_present(c) ((c)->state |= MMC_STATE_PRESENT)
> #define mmc_card_set_readonly(c) ((c)->state |= MMC_STATE_READONLY)
> @@ -437,6 +441,8 @@ static inline void __maybe_unused remove_quirk(struct mmc_card *card, int data)
> #define mmc_card_clr_doing_bkops(c) ((c)->state &= ~MMC_STATE_DOING_BKOPS)
> #define mmc_card_set_suspended(c) ((c)->state |= MMC_STATE_SUSPENDED)
> #define mmc_card_clr_suspended(c) ((c)->state &= ~MMC_STATE_SUSPENDED)
> +#define mmc_card_set_sleep_notify(c) ((c)->state |= MMC_STATE_SLEEP_NOTIFY)
> +#define mmc_card_clr_sleep_notify(c) ((c)->state &= ~MMC_STATE_SLEEP_NOTIFY)
>
> /*
> * Quirk add/remove for MMC products.
> diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
> index f471193..111e05d 100644
> --- a/include/linux/mmc/host.h
> +++ b/include/linux/mmc/host.h
> @@ -286,6 +286,7 @@ struct mmc_host {
> MMC_CAP2_HS400_1_2V)
> #define MMC_CAP2_HSX00_1_2V (MMC_CAP2_HS200_1_2V_SDR | MMC_CAP2_HS400_1_2V)
> #define MMC_CAP2_SDIO_IRQ_NOTHREAD (1 << 17)
> +#define MMC_CAP2_SLEEP_NOTIFY (1 << 18) /* sleep notify supported */
>
> mmc_pm_flag_t pm_caps; /* supported pm features */
>
> diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
> index 124f562..bbb71ae 100644
> --- a/include/linux/mmc/mmc.h
> +++ b/include/linux/mmc/mmc.h
> @@ -309,6 +309,7 @@ struct _mmc_csd {
> #define EXT_CSD_PWR_CL_52_360 202 /* RO */
> #define EXT_CSD_PWR_CL_26_360 203 /* RO */
> #define EXT_CSD_SEC_CNT 212 /* RO, 4 bytes */
> +#define EXT_CSD_SLEEP_NOTIFICATION_TIME 216 /* RO */
> #define EXT_CSD_S_A_TIMEOUT 217 /* RO */
> #define EXT_CSD_REL_WR_SEC_C 222 /* RO */
> #define EXT_CSD_HC_WP_GRP_SIZE 221 /* RO */
> @@ -403,6 +404,7 @@ struct _mmc_csd {
> #define EXT_CSD_POWER_ON 1
> #define EXT_CSD_POWER_OFF_SHORT 2
> #define EXT_CSD_POWER_OFF_LONG 3
> +#define EXT_CSD_SLEEP_NOTIFICATION 4
>
> #define EXT_CSD_PWR_CL_8BIT_MASK 0xF0 /* 8 bit PWR CLS */
> #define EXT_CSD_PWR_CL_4BIT_MASK 0x0F /* 8 bit PWR CLS */
> --
> 1.7.9.5
>
Kind regards
Uffe
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