RE: [PATCH V8] mmc: core: Add Power Off Notify Feature eMMC 4.5

Seungwon Jeon
2011-10-18T00:40:38Z

Base code of V8 may be mixed.
Please check below for next resending. It seems like unrelated.

#define MMC_CAP2_CACHE_CTRL (1 << 1)
#define EXT_CSD_FLUSH_CACHE 32

Best regards,
Seungwon Jeon.

Girish K S wrote:
> This patch adds the support for power off notify feature, available in
> eMMC 4.5 devices. If the the host has support for this feature, then the
> mmc core will notify it to the device by setting the
> POWER_OFF_NOTIFICATION
> byte in the extended csd register with a value 1(POWER_ON).
>
> For suspend mode short timeout is used, whereas for the normal poweroff
> long
> timeout is used.
> cc: Chris Ball <cjb@laptop.org>
> Signed-off-by: Girish K S <girish.shivananjappa@linaro.org>
> Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
> ---
> Changes in V8:
> Updated with review comments of Chris Ball and rebased to
> chris-mmc/mmc-next branch.
> Changes in V7:
> Rebased to chris-mmc/mmc-next branch. merged to patches
> to single patch.
> Changes in V6:
> Fixes checkpatch errors. The patches are generated after
> rebasing to chris's mmc-next branch.
> Changes in V5:
> This patch version fixes the problem with power off
> notify function, when called for the first time and
> card is not yet initialised.
> Changes in V4:
> Updated with review comments of Jeon
> Changes in V2:
> Adds poweroff notification handling in suspend/normal.
>
> drivers/mmc/core/core.c | 36 ++++++++++++++++++++++++++++++++++++
> drivers/mmc/core/mmc.c | 23 +++++++++++++++++++++--
> drivers/mmc/host/sdhci.c | 9 +++++++++
> include/linux/mmc/card.h | 6 ++++++
> include/linux/mmc/host.h | 6 ++++++
> include/linux/mmc/mmc.h | 8 ++++++++
> 6 files changed, 86 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
> index 61d7730..db368b2 100644
> --- a/drivers/mmc/core/core.c
> +++ b/drivers/mmc/core/core.c
> @@ -1212,11 +1212,45 @@ static void mmc_power_up(struct mmc_host *host)
>
> void mmc_power_off(struct mmc_host *host)
> {
> + struct mmc_card *card;
> + unsigned int notify_type;
> + unsigned int timeout;
> + int err;
> +
> + BUG_ON(!host);
> +
> mmc_host_clk_hold(host);
>
> + card = host->card;
> host->ios.clock = 0;
> host->ios.vdd = 0;
>
> + if (card != NULL && 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;
> + }
> +
> /*
> * Reset ocr mask to be the highest possible voltage supported for
> * this mmc host. This value will be used at next power up.
> @@ -2208,6 +2242,7 @@ 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);
>
> @@ -2231,6 +2266,7 @@ 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 4e869d3..f8ea938 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -458,10 +458,12 @@ static int mmc_read_ext_csd(struct mmc_card *card,
> u8 *ext_csd)
> else
> card->erased_byte = 0x0;
>
> - if (card->ext_csd.rev >= 6)
> + if (card->ext_csd.rev >= 6) {
> card->ext_csd.generic_cmd6_time = 10 *
> ext_csd[EXT_CSD_GENERIC_CMD6_TIME];
> - else
> + card->ext_csd.power_off_longtime = 10 *
> + ext_csd[EXT_CSD_POWER_OFF_LONG_TIME];
> + } else
> card->ext_csd.generic_cmd6_time = 0;
>
> out:
> @@ -846,6 +848,23 @@ static int mmc_init_card(struct mmc_host *host, u32
> ocr,
> }
>
> /*
> + * If the host supports the power_off_notify capability then
> + * set the notification byte in the ext_csd register of device
> + */
> + if ((host->caps2 & MMC_CAP2_POWEROFF_NOTIFY) &&
> + (card->poweroff_notify_state == MMC_NO_POWER_NOTIFICATION)) {
> + err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
> + EXT_CSD_POWER_OFF_NOTIFICATION,
> + EXT_CSD_POWER_ON,
> + card->ext_csd.generic_cmd6_time);
> + if (err && err != -EBADMSG)
> + goto free_card;
> + }
> +
> + if (!err)
> + card->poweroff_notify_state = MMC_POWERED_ON;
> +
> + /*
> * Activate high speed (if supported)
> */
> if ((card->ext_csd.hs_max_dtr != 0) &&
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index 2cc3ffa..91fdaed 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -2739,6 +2739,15 @@ int sdhci_add_host(struct sdhci_host *host)
> if (caps[1] & SDHCI_DRIVER_TYPE_D)
> mmc->caps |= MMC_CAP_DRIVER_TYPE_D;
>
> + /*
> + * If 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 30d493c..fce88b3 100644
> --- a/include/linux/mmc/card.h
> +++ b/include/linux/mmc/card.h
> @@ -54,6 +54,7 @@ struct mmc_ext_csd {
> unsigned int part_time; /* Units: ms */
> unsigned int sa_timeout; /* Units: 100ns */
> unsigned int generic_cmd6_time; /* Units: 10ms */
> + unsigned int power_off_longtime; /* Units: ms */
> unsigned int hs_max_dtr;
> unsigned int sectors;
> unsigned int card_type;
> @@ -209,6 +210,11 @@ struct mmc_card {
> #define MMC_QUIRK_BLK_NO_CMD23 (1<<7) /* Avoid CMD23 for regular
> multiblock */
> #define MMC_QUIRK_BROKEN_BYTE_MODE_512 (1<<8) /* Avoid sending 512 bytes
> in */
> /* 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 */
> diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
> index aed5bc7..65c47fc 100644
> --- a/include/linux/mmc/host.h
> +++ b/include/linux/mmc/host.h
> @@ -239,8 +239,14 @@ struct mmc_host {
> unsigned int caps2; /* More host capabilities */
>
> #define MMC_CAP2_BOOTPART_NOACC (1 << 0) /* Boot partition no access
> */
> +#define MMC_CAP2_CACHE_CTRL (1 << 1) /* Allow cache control. */
> +#define MMC_CAP2_POWEROFF_NOTIFY (1 << 2) /* Notify poweroff
> supported */
>
> 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 cd63c2d..36ed258 100644
> --- a/include/linux/mmc/mmc.h
> +++ b/include/linux/mmc/mmc.h
> @@ -271,6 +271,9 @@ struct _mmc_csd {
> */
>
> #define EXT_CSD_GP_SIZE_MULT 143 /* R/W */
> +#define EXT_CSD_FLUSH_CACHE 32 /* W */
> +#define EXT_CSD_CACHE_CTRL 33 /* R/W */
> +#define EXT_CSD_POWER_OFF_NOTIFICATION 34 /* R/W */
> #define EXT_CSD_PARTITION_ATTRIBUTE 156 /* R/W */
> #define EXT_CSD_PARTITION_SUPPORT 160 /* RO */
> #define EXT_CSD_RST_N_FUNCTION 162 /* R/W */
> @@ -346,6 +349,11 @@ struct _mmc_csd {
> #define EXT_CSD_RST_N_EN_MASK 0x3
> #define EXT_CSD_RST_N_ENABLED 1 /* RST_n is enabled on card */
>
> +#define EXT_CSD_NO_POWER_NOTIFICATION 0
> +#define EXT_CSD_POWER_ON 1
> +#define EXT_CSD_POWER_OFF_SHORT 2
> +#define EXT_CSD_POWER_OFF_LONG 3
> +
> #define EXT_CSD_PWR_CL_8BIT_MASK 0xF0 /* 8 bit PWR CLS */
> #define EXT_CSD_PWR_CL_4BIT_MASK 0x0F /* 8 bit PWR CLS */
> #define EXT_CSD_PWR_CL_8BIT_SHIFT 4
> --
> 1.7.1
>
> --
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