HI Ulf,
You had Acked the rework patch mailed by Saugata. But this patch
doesnt look same like the one sent by saugata.
On 13 September 2012 14:50, Ulf Hansson <ulf.hansson@xxxxxxxxxxxxxx> wrote:
> From: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
>
> This patch fixup the broken suspend sequence for eMMC
> with sleep support. Additionally it reworks the eMMC4.5
> Power Off Notification feature so it fits together with
> the existing sleep feature.
>
> The CMD0 based re-initialization of the eMMC at resume
> is re-introduced to maintain compatiblity for devices
> using sleep.
>
> A host shall use MMC_CAP2_POWEROFF_NOTIFY to enable the
> Power Off Notification feature. We might be able to
> remove this cap later on, if we think that Power Off
> Notification always is preferred over sleep, even if the
> host is not able to cut the eMMC VCCQ power.
>
> Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
> Signed-off-by: Saugata Das <saugata.das@xxxxxxxxxx>
> CC: Girish K S <girish.shivananjappa@xxxxxxxxxx>
> CC: Asutosh Das <asutoshd@xxxxxxxxxxxxxx>
> ---
> drivers/mmc/core/core.c | 62 ---------------------------------------------
> drivers/mmc/core/mmc.c | 46 +++++++++++++++++++++++++--------
> drivers/mmc/host/dw_mmc.c | 5 ----
> drivers/mmc/host/sdhci.c | 9 -------
> include/linux/mmc/card.h | 10 +-------
> include/linux/mmc/host.h | 4 ---
> 6 files changed, 36 insertions(+), 100 deletions(-)
>
> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
> index af2c4d2..2765097 100644
> --- a/drivers/mmc/core/core.c
> +++ b/drivers/mmc/core/core.c
> @@ -1134,48 +1134,6 @@ void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type)
> mmc_host_clk_release(host);
> }
>
> -static void mmc_poweroff_notify(struct mmc_host *host)
> -{
> - struct mmc_card *card;
> - unsigned int timeout;
> - unsigned int notify_type = EXT_CSD_NO_POWER_NOTIFICATION;
> - int err = 0;
> -
> - card = host->card;
> - mmc_claim_host(host);
> -
> - /*
> - * Send power notify command only if card
> - * is mmc and notify state is powered ON
> - */
> - if (card && mmc_card_mmc(card) &&
> - (card->poweroff_notify_state == MMC_POWERED_ON)) {
> -
> - if (host->power_notify_type == MMC_HOST_PW_NOTIFY_SHORT) {
> - notify_type = EXT_CSD_POWER_OFF_SHORT;
> - timeout = card->ext_csd.generic_cmd6_time;
> - card->poweroff_notify_state = MMC_POWEROFF_SHORT;
> - } else {
> - notify_type = EXT_CSD_POWER_OFF_LONG;
> - timeout = card->ext_csd.power_off_longtime;
> - card->poweroff_notify_state = MMC_POWEROFF_LONG;
> - }
> -
> - err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
> - EXT_CSD_POWER_OFF_NOTIFICATION,
> - notify_type, timeout);
> -
> - if (err && err != -EBADMSG)
> - pr_err("Device failed to respond within %d poweroff "
> - "time. Forcefully powering down the device\n",
> - timeout);
> -
> - /* Set the card state to no notification after the poweroff */
> - card->poweroff_notify_state = MMC_NO_POWER_NOTIFICATION;
> - }
> - mmc_release_host(host);
> -}
> -
> /*
> * Apply power to the MMC stack. This is a two-stage process.
> * First, we enable power to the card without the clock running.
> @@ -1238,8 +1196,6 @@ static void mmc_power_up(struct mmc_host *host)
>
> void mmc_power_off(struct mmc_host *host)
> {
> - int err = 0;
> -
> if (host->ios.power_mode == MMC_POWER_OFF)
> return;
>
> @@ -1248,22 +1204,6 @@ void mmc_power_off(struct mmc_host *host)
> host->ios.clock = 0;
> host->ios.vdd = 0;
>
> - /*
> - * For eMMC 4.5 device send AWAKE command before
> - * POWER_OFF_NOTIFY command, because in sleep state
> - * eMMC 4.5 devices respond to only RESET and AWAKE cmd
> - */
> - if (host->card && mmc_card_is_sleep(host->card) &&
> - host->bus_ops->resume) {
> - err = host->bus_ops->resume(host);
> -
> - if (!err)
> - mmc_poweroff_notify(host);
> - else
> - pr_warning("%s: error %d during resume "
> - "(continue with poweroff sequence)\n",
> - mmc_hostname(host), err);
> - }
>
> /*
> * Reset ocr mask to be the highest possible voltage supported for
> @@ -2425,7 +2365,6 @@ int mmc_pm_notify(struct notifier_block *notify_block,
>
> spin_lock_irqsave(&host->lock, flags);
> host->rescan_disable = 1;
> - host->power_notify_type = MMC_HOST_PW_NOTIFY_SHORT;
> spin_unlock_irqrestore(&host->lock, flags);
> cancel_delayed_work_sync(&host->detect);
>
> @@ -2449,7 +2388,6 @@ int mmc_pm_notify(struct notifier_block *notify_block,
>
> spin_lock_irqsave(&host->lock, flags);
> host->rescan_disable = 0;
> - host->power_notify_type = MMC_HOST_PW_NOTIFY_LONG;
> spin_unlock_irqrestore(&host->lock, flags);
> mmc_detect_change(host, 0);
>
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index 396b258..9607c35 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -996,7 +996,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
> * so check for success and update the flag
> */
> if (!err)
> - card->poweroff_notify_state = MMC_POWERED_ON;
> + card->ext_csd.power_off_notification = EXT_CSD_POWER_ON;
> }
>
> /*
> @@ -1262,6 +1262,35 @@ err:
> return err;
> }
>
> +static int mmc_can_poweroff_notify(const struct mmc_card *card)
> +{
> + return card &&
> + mmc_card_mmc(card) &&
> + (card->ext_csd.power_off_notification == EXT_CSD_POWER_ON);
> +}
> +
> +static int mmc_poweroff_notify(struct mmc_card *card, unsigned int notify_type)
> +{
> + unsigned int timeout = card->ext_csd.generic_cmd6_time;
> + int err;
> +
> + /* 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;
> +
> + err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
> + EXT_CSD_POWER_OFF_NOTIFICATION,
> + notify_type, timeout);
> + if (err)
> + pr_err("%s: Power Off Notification timed out, %u\n",
> + 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;
> +}
> +
> /*
> * Host is being removed. Free up the current card.
> */
> @@ -1322,11 +1351,11 @@ static int mmc_suspend(struct mmc_host *host)
> BUG_ON(!host->card);
>
> mmc_claim_host(host);
> - if (mmc_card_can_sleep(host)) {
> + if (mmc_can_poweroff_notify(host->card))
> + err = mmc_poweroff_notify(host->card, EXT_CSD_POWER_OFF_SHORT);
> + else if (mmc_card_can_sleep(host))
> err = mmc_card_sleep(host);
> - if (!err)
> - mmc_card_set_sleep(host->card);
> - } else if (!mmc_host_is_spi(host))
> + else if (!mmc_host_is_spi(host))
> err = mmc_deselect_cards(host);
> host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200);
> mmc_release_host(host);
> @@ -1348,11 +1377,7 @@ static int mmc_resume(struct mmc_host *host)
> BUG_ON(!host->card);
>
> mmc_claim_host(host);
> - if (mmc_card_is_sleep(host->card)) {
> - err = mmc_card_awake(host);
> - mmc_card_clr_sleep(host->card);
> - } else
> - err = mmc_init_card(host, host->ocr, host->card);
> + err = mmc_init_card(host, host->ocr, host->card);
> mmc_release_host(host);
>
> return err;
> @@ -1363,7 +1388,6 @@ static int mmc_power_restore(struct mmc_host *host)
> int ret;
>
> host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200);
> - mmc_card_clr_sleep(host->card);
> mmc_claim_host(host);
> ret = mmc_init_card(host, host->ocr, host->card);
> mmc_release_host(host);
> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
> index 36f98c0..7ef4f8a 100644
> --- a/drivers/mmc/host/dw_mmc.c
> +++ b/drivers/mmc/host/dw_mmc.c
> @@ -1810,11 +1810,6 @@ static int dw_mci_init_slot(struct dw_mci *host, unsigned int id)
> if (host->pdata->quirks & DW_MCI_QUIRK_HIGHSPEED)
> mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
>
> - if (mmc->caps2 & MMC_CAP2_POWEROFF_NOTIFY)
> - mmc->power_notify_type = MMC_HOST_PW_NOTIFY_SHORT;
> - else
> - mmc->power_notify_type = MMC_HOST_PW_NOTIFY_NONE;
> -
> if (host->pdata->blk_settings) {
> mmc->max_segs = host->pdata->blk_settings->max_segs;
> mmc->max_blk_size = host->pdata->blk_settings->max_blk_size;
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index d98b199..6035094 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -2878,15 +2878,6 @@ int sdhci_add_host(struct sdhci_host *host)
> if (caps[1] & SDHCI_DRIVER_TYPE_D)
> mmc->caps |= MMC_CAP_DRIVER_TYPE_D;
>
> - /*
> - * If Power Off Notify capability is enabled by the host,
> - * set notify to short power off notify timeout value.
> - */
> - if (mmc->caps2 & MMC_CAP2_POWEROFF_NOTIFY)
> - mmc->power_notify_type = MMC_HOST_PW_NOTIFY_SHORT;
> - else
> - mmc->power_notify_type = MMC_HOST_PW_NOTIFY_NONE;
> -
> /* Initial value for re-tuning timer count */
> host->tuning_count = (caps[1] & SDHCI_RETUNING_TIMER_COUNT_MASK) >>
> SDHCI_RETUNING_TIMER_COUNT_SHIFT;
> diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
> index 4b27f9f..90f655b 100644
> --- a/include/linux/mmc/card.h
> +++ b/include/linux/mmc/card.h
> @@ -57,6 +57,7 @@ struct mmc_ext_csd {
> unsigned int sa_timeout; /* Units: 100ns */
> unsigned int generic_cmd6_time; /* Units: 10ms */
> unsigned int power_off_longtime; /* Units: ms */
> + u8 power_off_notification; /* state */
> unsigned int hs_max_dtr;
> #define MMC_HIGH_26_MAX_DTR 26000000
> #define MMC_HIGH_52_MAX_DTR 52000000
> @@ -225,7 +226,6 @@ struct mmc_card {
> #define MMC_CARD_SDXC (1<<6) /* card is SDXC */
> #define MMC_CARD_REMOVED (1<<7) /* card has been removed */
> #define MMC_STATE_HIGHSPEED_200 (1<<8) /* card is in HS200 mode */
> -#define MMC_STATE_SLEEP (1<<9) /* card is in sleep state */
> 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 */
> @@ -241,11 +241,6 @@ struct mmc_card {
> #define MMC_QUIRK_LONG_READ_TIME (1<<9) /* Data read time > CSD says */
> #define MMC_QUIRK_SEC_ERASE_TRIM_BROKEN (1<<10) /* Skip secure for erase/trim */
> /* byte mode */
> - unsigned int poweroff_notify_state; /* eMMC4.5 notify feature */
> -#define MMC_NO_POWER_NOTIFICATION 0
> -#define MMC_POWERED_ON 1
> -#define MMC_POWEROFF_SHORT 2
> -#define MMC_POWEROFF_LONG 3
>
> unsigned int erase_size; /* erase size in sectors */
> unsigned int erase_shift; /* if erase unit is power 2 */
> @@ -392,7 +387,6 @@ static inline void __maybe_unused remove_quirk(struct mmc_card *card, int data)
> #define mmc_sd_card_uhs(c) ((c)->state & MMC_STATE_ULTRAHIGHSPEED)
> #define mmc_card_ext_capacity(c) ((c)->state & MMC_CARD_SDXC)
> #define mmc_card_removed(c) ((c) && ((c)->state & MMC_CARD_REMOVED))
> -#define mmc_card_is_sleep(c) ((c)->state & MMC_STATE_SLEEP)
>
> #define mmc_card_set_present(c) ((c)->state |= MMC_STATE_PRESENT)
> #define mmc_card_set_readonly(c) ((c)->state |= MMC_STATE_READONLY)
> @@ -404,9 +398,7 @@ static inline void __maybe_unused remove_quirk(struct mmc_card *card, int data)
> #define mmc_sd_card_set_uhs(c) ((c)->state |= MMC_STATE_ULTRAHIGHSPEED)
> #define mmc_card_set_ext_capacity(c) ((c)->state |= MMC_CARD_SDXC)
> #define mmc_card_set_removed(c) ((c)->state |= MMC_CARD_REMOVED)
> -#define mmc_card_set_sleep(c) ((c)->state |= MMC_STATE_SLEEP)
>
> -#define mmc_card_clr_sleep(c) ((c)->state &= ~MMC_STATE_SLEEP)
> /*
> * Quirk add/remove for MMC products.
> */
> diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
> index d5d9bd4..7abb0e1 100644
> --- a/include/linux/mmc/host.h
> +++ b/include/linux/mmc/host.h
> @@ -259,10 +259,6 @@ struct mmc_host {
> #define MMC_CAP2_RO_ACTIVE_HIGH (1 << 11) /* Write-protect signal active high */
>
> mmc_pm_flag_t pm_caps; /* supported pm features */
> - unsigned int power_notify_type;
> -#define MMC_HOST_PW_NOTIFY_NONE 0
> -#define MMC_HOST_PW_NOTIFY_SHORT 1
> -#define MMC_HOST_PW_NOTIFY_LONG 2
>
> #ifdef CONFIG_MMC_CLKGATE
> int clk_requests; /* internal reference counter */
> --
> 1.7.10
>
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