Re: [PATCH V9] mmc: core: Add Power Off Notify Feature eMMC 4.5

[Jaehoon Chung <jh80.chung@samsung.com>]

Hi Girish.

I know you're worked based-on latest mmc-next.
But this patch is already merged on mmc-next...

Merged patch is already included #define MMC_CAP2_CACHE_CTRL and EXT_CSD_FLUSH_CACHE.

So i didn't add them in [mmc: core: Add cache control for eMMC4.5 device] on the below repository
git://git.infradead.org/users/kmpark/linux-2.6-samsung emmc4.5

What do you want how i do? :)

Best regards,
Jaehoon Chung


On 10/18/2011 02:25 PM, Girish K S wrote:

> On 18 October 2011 10:49, Girish K S <girish.shivananjappa@linaro.org> wrote:
>> On 18 October 2011 10:46, Jaehoon Chung <jh80.chung@samsung.com> wrote:
>>> Hi Girish.
>>>
>>> This patch is merged on mmc-next..did you know that?
>>> And if deleted commit id bd3151f6c55c553bed2c0df72792841457b75bb5,
>>> I will re-work for eMMC feature4.5.
>>> git://git.infradead.org/users/kmpark/linux-2.6-samsung emmc4.5
>>>
>>> To Chris.
>>> If you re-commit this patch, i also change "git pull request".
>>> there are duplicated code in Notify patch, so i didn't add to cache patch.
>>> HI Jaehoon,
>>  I have already bought it to the notice of Chris. After discussing
>> with Chris i am resending the complete patch.
>>> Regards,
>>> Jaehoon Chung
>>> Adding to it. In your mail with subject "[GIT PULL v2] Add eMMC4.5 feature for v3.2", for version 2 changes it is mentioned
> that power notify feature is removed. Thats the reason i rebased my
> patch to Chris's mmc-next branch and resent.
>>> On 10/18/2011 02:05 PM, 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 V9:
>>>>       Removed the macros not related with the PowerOff notify feature.
>>>>       The previous patch with commit id
>>>>       bd3151f6c55c553bed2c0df72792841457b75bb5 should be deleted before
>>>>       applying this patch.
>>>> 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  |   34 ++++++++++++++++++++++++++++++++++
>>>>  drivers/mmc/core/mmc.c   |   23 +++++++++++++++++++++--
>>>>  drivers/mmc/host/sdhci.c |    9 +++++++++
>>>>  include/linux/mmc/card.h |    6 ++++++
>>>>  include/linux/mmc/host.h |    5 +++++
>>>>  include/linux/mmc/mmc.h  |    6 ++++++
>>>>  6 files changed, 81 insertions(+), 2 deletions(-)
>>>>
>>>> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
>>>> index 61d7730..b1eca96 100644
>>>> --- a/drivers/mmc/core/core.c
>>>> +++ b/drivers/mmc/core/core.c
>>>> @@ -1212,11 +1212,43 @@ 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;
>>>> +
>>>>       mmc_host_clk_hold(host);
>>>>
>>>> +     card = host->card;
>>>>       host->ios.clock = 0;
>>>>       host->ios.vdd = 0;
>>>>
>>>> +     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;
>>>> +     }
>>>> +
>>>>       /*
>>>>        * 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 +2240,7 @@ 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 +2264,7 @@ 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..07c0abf 100644
>>>> --- a/include/linux/mmc/host.h
>>>> +++ b/include/linux/mmc/host.h
>>>> @@ -239,8 +239,13 @@ struct mmc_host {
>>>>       unsigned int            caps2;          /* More host capabilities */
>>>>
>>>>  #define MMC_CAP2_BOOTPART_NOACC      (1 << 0)        /* Boot partition no access */
>>>> +#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..8b0e0a7 100644
>>>> --- a/include/linux/mmc/mmc.h
>>>> +++ b/include/linux/mmc/mmc.h
>>>> @@ -271,6 +271,7 @@ struct _mmc_csd {
>>>>   */
>>>>
>>>>  #define EXT_CSD_GP_SIZE_MULT         143     /* 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 +347,11 @@ 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
>>>
>>>
>>>
>>
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