Hi Girish and Suagata,
I have run some regression tests with this patch on our board (ux500
family) running suspend and resume of the eMMC 4.41 device.
The two patches I have looked at are:
1. "mmc: core: Fix PowerOff Notify suspend/resume" (merged)
2. " MMC-4.5 Power OFF Notify Rework"
With only patch #1 the eMMC doesn't power up after in resume() after
being suspended. The eMMC doesn't respond at all after suspend. It's
not powered up.
Running tests with #1 and #2, the card is powered up but it doesn't
wake up after CMD5. Commands that arrive are after resume/CMD5
timeouts. I even tried by increasing the awake timeout to 5 seconds
but i didn't help.
The eMMC on my board successfully suspends and resumes with patch #1
and #2 if waking up the card using CMD0 (mmc_card_init()) instead of
CMD5.
Have anyone else seen the same issue?
Have this patch been verified on a board together with eMMC 4.41 that
supports card power off.
BR
Per
On Tue, May 22, 2012 at 1:45 PM, Girish K S
<girish.shivananjappa@xxxxxxxxxx> wrote:
> From: Saugata Das <saugata.das@xxxxxxxxxx>
>
> This is a rework of the existing POWER OFF NOTIFY patch. The current problem
> with the patch comes from the ambiguity on the usage of POWER OFF NOTIFY
> together with SLEEP and misunderstanding on the usage of MMC_POWER_OFF
> power_mode from mmc_set_ios in different host controller drivers.
>
> This new patch works around this problem by adding a new host CAP,
> MMC_CAP2_POWER_OFF_VCCQ_DURING_SUSPEND, which when set sends a
> POWER OFF NOTIFY from mmc_suspend instead of SLEEP. It is expected that host
> controller drivers will set this CAP, if they switch off both Vcc and Vccq
> from MMC_POWER_OFF condition within mmc_set_ios. However, note that there
> is no harm in sending MMC_POWER_NOTIFY even if Vccq is not switched off.
>
> This patch also sends POWER OFF NOTIFY from power management routines (e.g.
> mmc_power_save_host, mmc_pm_notify/PM_SUSPEND_PREPARE, mmc_stop_host), which
> does reinitialization of the eMMC on the return path of the power management
> routines (e.g. mmc_power_restore_host, mmc_pm_notify/PM_POST_RESTORE,
> mmc_start_host).
>
> This patch sets POWER_OFF_NOTIFICATION to POWER_OFF_SHORT if it is sent from
> the suspend sequence. If it is sent from shutdown sequence then it is set to
> POWER_OFF_LONG.
>
> Earlier implementation of PowerOff Notify as a core function is replaced as
> a device's bus operation.
>
> Signed-off-by: Saugata Das <saugata.das@xxxxxxxxxx>
> Signed-off-by: Girish K S <girish.shivananjappa@xxxxxxxxxx>
>
> changes in v5:
> modified the the handling of return value in mmc_poweroff_notify.
> changes in v4:
> As suggested in review,
> - Moved mmc_can_poweroff_notify to core.c
> - Moved mmc_claim_host, mmc_release_host outside mmc_poweroff_notify
> - Added check for wrong initialization for poweroff_notify_type
> - mmc_poweroff_notify is modified to take as 2nd parameter
> changes in v3:
> This version addresses the review comments given by Subhash and Ulf
> changes in v2:
> This version addresses the changes suggested by Ulf
> ---
> drivers/mmc/core/core.c | 108 ++++++++++++++++++--------------------------
> drivers/mmc/core/core.h | 1 +
> drivers/mmc/core/mmc.c | 56 ++++++++++++++++++++---
> drivers/mmc/host/dw_mmc.c | 5 --
> drivers/mmc/host/sdhci.c | 9 ----
> include/linux/mmc/card.h | 5 +-
> include/linux/mmc/core.h | 1 +
> include/linux/mmc/host.h | 5 +--
> include/linux/mmc/mmc.h | 7 +++
> 9 files changed, 104 insertions(+), 93 deletions(-)
>
> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
> index 0b6141d..fe616b9 100644
> --- a/drivers/mmc/core/core.c
> +++ b/drivers/mmc/core/core.c
> @@ -1101,48 +1101,6 @@ 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.
> @@ -1202,8 +1160,6 @@ 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;
>
> @@ -1212,22 +1168,6 @@ 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
> @@ -1726,6 +1666,15 @@ int mmc_can_secure_erase_trim(struct mmc_card *card)
> }
> EXPORT_SYMBOL(mmc_can_secure_erase_trim);
>
> +int mmc_can_poweroff_notify(const struct mmc_card *card)
> +{
> + return card &&
> + mmc_card_mmc(card) &&
> + card->host->bus_ops->poweroff_notify &&
> + (card->poweroff_notify_state == MMC_POWERED_ON);
> +}
> +EXPORT_SYMBOL(mmc_can_poweroff_notify);
> +
> int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from,
> unsigned int nr)
> {
> @@ -2096,6 +2045,15 @@ void mmc_stop_host(struct mmc_host *host)
>
> mmc_bus_get(host);
> if (host->bus_ops && !host->bus_dead) {
> + mmc_claim_host(host);
> + if (mmc_can_poweroff_notify(host->card)) {
> + int err = host->bus_ops->poweroff_notify(host,
> + MMC_PW_OFF_NOTIFY_LONG);
> + if (err)
> + pr_info("%s: error [%d] in poweroff notify\n",
> + mmc_hostname(host), err);
> + }
> + mmc_release_host(host);
> /* Calling bus_ops->remove() with a claimed host can deadlock */
> if (host->bus_ops->remove)
> host->bus_ops->remove(host);
> @@ -2131,6 +2089,15 @@ int mmc_power_save_host(struct mmc_host *host)
>
> if (host->bus_ops->power_save)
> ret = host->bus_ops->power_save(host);
> + mmc_claim_host(host);
> + if (mmc_can_poweroff_notify(host->card)) {
> + int err = host->bus_ops->poweroff_notify(host,
> + MMC_PW_OFF_NOTIFY_SHORT);
> + if (err)
> + pr_info("%s: error [%d] in poweroff notify\n",
> + mmc_hostname(host), err);
> + }
> + mmc_release_host(host);
>
> mmc_bus_put(host);
>
> @@ -2173,8 +2140,11 @@ int mmc_card_awake(struct mmc_host *host)
>
> mmc_bus_get(host);
>
> - if (host->bus_ops && !host->bus_dead && host->bus_ops->awake)
> + if (host->bus_ops && !host->bus_dead && host->bus_ops->awake) {
> err = host->bus_ops->awake(host);
> + if (!err)
> + mmc_card_clr_sleep(host->card);
> + }
>
> mmc_bus_put(host);
>
> @@ -2191,8 +2161,11 @@ int mmc_card_sleep(struct mmc_host *host)
>
> mmc_bus_get(host);
>
> - if (host->bus_ops && !host->bus_dead && host->bus_ops->sleep)
> + if (host->bus_ops && !host->bus_dead && host->bus_ops->sleep) {
> err = host->bus_ops->sleep(host);
> + if (!err)
> + mmc_card_set_sleep(host->card);
> + }
>
> mmc_bus_put(host);
>
> @@ -2385,12 +2358,20 @@ 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);
>
> if (!host->bus_ops || host->bus_ops->suspend)
> break;
> + mmc_claim_host(host);
> + if (mmc_can_poweroff_notify(host->card)) {
> + int err = host->bus_ops->poweroff_notify(host,
> + MMC_PW_OFF_NOTIFY_SHORT);
> + if (err)
> + pr_info("%s: error [%d] in poweroff notify\n",
> + mmc_hostname(host), err);
> + }
> + mmc_release_host(host);
>
> /* Calling bus_ops->remove() with a claimed host can deadlock */
> if (host->bus_ops->remove)
> @@ -2409,7 +2390,6 @@ 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/core.h b/drivers/mmc/core/core.h
> index 3bdafbc..15b918d 100644
> --- a/drivers/mmc/core/core.h
> +++ b/drivers/mmc/core/core.h
> @@ -25,6 +25,7 @@ struct mmc_bus_ops {
> int (*power_save)(struct mmc_host *);
> int (*power_restore)(struct mmc_host *);
> int (*alive)(struct mmc_host *);
> + int (*poweroff_notify)(struct mmc_host *, int notify);
> };
>
> void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops);
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index 2f0e11c..042dbdc 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -1259,6 +1259,40 @@ err:
> return err;
> }
>
> +static int mmc_poweroff_notify(struct mmc_host *host, int notify)
> +{
> + struct mmc_card *card;
> + unsigned int timeout;
> + unsigned int notify_type = EXT_CSD_NO_POWER_NOTIFICATION;
> + int err;
> +
> + card = host->card;
> +
> + if (notify == MMC_PW_OFF_NOTIFY_SHORT) {
> + notify_type = EXT_CSD_POWER_OFF_SHORT;
> + timeout = card->ext_csd.generic_cmd6_time;
> + } else if (notify == MMC_PW_OFF_NOTIFY_LONG) {
> + notify_type = EXT_CSD_POWER_OFF_LONG;
> + timeout = card->ext_csd.power_off_longtime;
> + } else {
> + pr_info("%s: mmc_poweroff_notify called "
> + "with notify type %d\n", mmc_hostname(host), notify);
> + return -EINVAL;
> + }
> +
> + err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
> + EXT_CSD_POWER_OFF_NOTIFICATION,
> + notify_type, timeout);
> +
> + if (err)
> + pr_err("%s: Device failed to respond within %d "
> + "poweroff timeout.\n", mmc_hostname(host), timeout);
> + else
> + card->poweroff_notify_state =
> + MMC_NO_POWER_NOTIFICATION;
> +
> + return err;
> +}
> /*
> * Host is being removed. Free up the current card.
> */
> @@ -1319,13 +1353,18 @@ static int mmc_suspend(struct mmc_host *host)
> BUG_ON(!host->card);
>
> mmc_claim_host(host);
> - 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))
> - mmc_deselect_cards(host);
> - host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200);
> + if (mmc_can_poweroff_notify(host->card) &&
> + (host->caps2 & MMC_CAP2_POWER_OFF_VCCQ_DURING_SUSPEND)) {
> + err = mmc_poweroff_notify(host, MMC_PW_OFF_NOTIFY_SHORT);
> + } else {
> + if (mmc_card_can_sleep(host))
> + err = mmc_card_sleep(host);
> + else if (!mmc_host_is_spi(host))
> + mmc_deselect_cards(host);
> + }
> + if (!err)
> + host->card->state &=
> + ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200);
> mmc_release_host(host);
>
> return err;
> @@ -1347,7 +1386,6 @@ static int mmc_resume(struct mmc_host *host)
> 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);
> mmc_release_host(host);
> @@ -1407,6 +1445,7 @@ static const struct mmc_bus_ops mmc_ops = {
> .resume = NULL,
> .power_restore = mmc_power_restore,
> .alive = mmc_alive,
> + .poweroff_notify = mmc_poweroff_notify,
> };
>
> static const struct mmc_bus_ops mmc_ops_unsafe = {
> @@ -1418,6 +1457,7 @@ static const struct mmc_bus_ops mmc_ops_unsafe = {
> .resume = mmc_resume,
> .power_restore = mmc_power_restore,
> .alive = mmc_alive,
> + .poweroff_notify = mmc_poweroff_notify,
> };
>
> static void mmc_attach_bus_ops(struct mmc_host *host)
> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
> index 1532357..463130f 100644
> --- a/drivers/mmc/host/dw_mmc.c
> +++ b/drivers/mmc/host/dw_mmc.c
> @@ -1788,11 +1788,6 @@ static int __init 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 e626732..c0a5a91 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -2812,15 +2812,6 @@ 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 d76513b..040eec4 100644
> --- a/include/linux/mmc/card.h
> +++ b/include/linux/mmc/card.h
> @@ -239,11 +239,10 @@ struct mmc_card {
> #define MMC_QUIRK_BROKEN_BYTE_MODE_512 (1<<8) /* Avoid sending 512 bytes in */
> #define MMC_QUIRK_LONG_READ_TIME (1<<9) /* Data read time > CSD says */
> /* byte mode */
> - unsigned int poweroff_notify_state; /* eMMC4.5 notify feature */
> + unsigned int poweroff_notify_state; /* MMC-4.5 poweroff
> + 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 */
> diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h
> index 1b431c7..54894d6 100644
> --- a/include/linux/mmc/core.h
> +++ b/include/linux/mmc/core.h
> @@ -161,6 +161,7 @@ extern int mmc_can_trim(struct mmc_card *card);
> extern int mmc_can_discard(struct mmc_card *card);
> extern int mmc_can_sanitize(struct mmc_card *card);
> extern int mmc_can_secure_erase_trim(struct mmc_card *card);
> +extern int mmc_can_poweroff_notify(const struct mmc_card *card);
> extern int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from,
> unsigned int nr);
> extern unsigned int mmc_calc_max_discard(struct mmc_card *card);
> diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
> index 0707d22..0e9adac 100644
> --- a/include/linux/mmc/host.h
> +++ b/include/linux/mmc/host.h
> @@ -238,12 +238,9 @@ struct mmc_host {
> #define MMC_CAP2_BROKEN_VOLTAGE (1 << 7) /* Use the broken voltage */
> #define MMC_CAP2_DETECT_ON_ERR (1 << 8) /* On I/O err check card removal */
> #define MMC_CAP2_HC_ERASE_SZ (1 << 9) /* High-capacity erase size */
> +#define MMC_CAP2_POWER_OFF_VCCQ_DURING_SUSPEND (1 << 10)
>
> 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 */
> diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
> index d425cab..b11876b 100644
> --- a/include/linux/mmc/mmc.h
> +++ b/include/linux/mmc/mmc.h
> @@ -386,4 +386,11 @@ struct _mmc_csd {
> #define MMC_SWITCH_MODE_CLEAR_BITS 0x02 /* Clear bits which are 1 in value */
> #define MMC_SWITCH_MODE_WRITE_BYTE 0x03 /* Set target to value */
>
> +/*
> + * MMC Poweroff Notify types
> + */
> +#define MMC_PW_OFF_NOTIFY_NONE 0
> +#define MMC_PW_OFF_NOTIFY_SHORT 1
> +#define MMC_PW_OFF_NOTIFY_LONG 2
> +
> #endif /* LINUX_MMC_MMC_H */
> --
> 1.7.4.1
>
> --
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