Re: [PATCH v2 2/2] mmc: core: Add Poweroff Notify handling

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On 7 September 2011 07:19, Kyungmin Park <kmpark@xxxxxxxxxxxxx> wrote:
> On Tue, Sep 6, 2011 at 7:59 PM, Girish K S
> <girish.shivananjappa@xxxxxxxxxx> wrote:
>> This patch adds the power off notification handling
>> during suspend and system poweroff.
>> For suspend mode short timeout is used, whereas for the
>> normal poweroff long timeout is used.
>>
>> Signed-off-by: Girish K S <girish.shivananjappa@xxxxxxxxxx>
>> ---
>>  drivers/mmc/core/core.c  |   33 +++++++++++++++++++++++++++++++++
>>  drivers/mmc/core/mmc.c   |    4 +++-
>>  drivers/mmc/host/sdhci.c |   10 ++++++++++
>>  include/linux/mmc/card.h |   19 +++++++++++++++++++
>>  include/linux/mmc/host.h |    4 ++++
>>  5 files changed, 69 insertions(+), 1 deletions(-)
>>
>> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
>> index a65e1ca..16da927 100644
>> --- a/drivers/mmc/core/core.c
>> +++ b/drivers/mmc/core/core.c
>> @@ -1130,9 +1130,38 @@ static void mmc_power_up(struct mmc_host *host)
>>
>>  static void mmc_power_off(struct mmc_host *host)
>>  {
>> +       struct mmc_card *card = host->card;
>> +       unsigned int notify_type;
>> +       unsigned int timeout;
>> +       int err;
>> +
>>        host->ios.clock = 0;
>>        host->ios.vdd = 0;
>>
>> +       if (mmc_card_mmc(card) &&
>> +               (mmc_card_powernotify_on(card))) {
>> +
>> +               if (host->power_notify_type == MMC_HOST_PW_NOTIFY_SHORT) {
>> +                       notify_type = EXT_CSD_POWER_OFF_SHORT;
>> +                       timeout = card->ext_csd.generic_cmd6_time;
>> +                       mmc_card_set_powernotify_short(card);
>> +               } else {
>> +                       notify_type = EXT_CSD_POWER_OFF_LONG;
>> +                       timeout = card->ext_csd.power_off_longtime;
>> +                       mmc_card_set_powernotify_long(card);
>> +               }
>> +
>> +               err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
>> +                               EXT_CSD_POWER_OFF_NOTIFICATION,
>> +                               notify_type, timeout);
>> +
>> +               if (err && err != -EBADMSG)
>> +                       printk(KERN_ERR "Device failed to respond "
>> +                                       "within %d poweroff time."
>> +                                       "forcefully powering down"
>> +                                       "the device\n", timeout);
>> +       }
>> +
> Okay this function is called when suspend.
>>        /*
>>         * Reset ocr mask to be the highest possible voltage supported for
>>         * this mmc host. This value will be used at next power up.
>> @@ -1147,6 +1176,8 @@ static void mmc_power_off(struct mmc_host *host)
>>        host->ios.bus_width = MMC_BUS_WIDTH_1;
>>        host->ios.timing = MMC_TIMING_LEGACY;
>>        mmc_set_ios(host);
>> +       /*Set the card state to no notification after the poweroff*/
>> +       mmc_card_set_powernotify_off(card);
>>  }
>>
>>  /*
>> @@ -2026,6 +2057,7 @@ 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);
>>
>> @@ -2048,6 +2080,7 @@ 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 2f06b37..8868da8 100644
>> --- a/drivers/mmc/core/mmc.c
>> +++ b/drivers/mmc/core/mmc.c
>> @@ -715,13 +715,15 @@ 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->caps & MMC_CAP_POWER_OFF_NOTIFY) {
>> +       if ((host->caps & MMC_CAP_POWER_OFF_NOTIFY)     &&
>> +               (mmc_card_powernotify_off(card))) {
>>                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;
>> +               mmc_card_set_powernotify_on(card);
>>        }
>>
>>        /*
>> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
>> index 0e02cc1..2ca427a 100644
>> --- a/drivers/mmc/host/sdhci.c
>> +++ b/drivers/mmc/host/sdhci.c
>> @@ -2566,6 +2566,16 @@ 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 and
>> +        * notify type is not initialised by host, set default to
>> +        * long power off notify timeout value
>> +        */
>> +       if (mmc->caps == MMC_CAP_POWER_OFF_NOTIFY)
> You should be check the mmc->caps & MMC_CAP_*. I think it's almost false.
oops.. will change it.
>> +               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 2bf2843..1d6a832 100644
>> --- a/include/linux/mmc/card.h
>> +++ b/include/linux/mmc/card.h
>> @@ -190,6 +190,11 @@ struct mmc_card {
>>  #define MMC_QUIRK_DISABLE_CD   (1<<5)          /* disconnect CD/DAT[3] resistor */
>>  #define MMC_QUIRK_INAND_CMD38  (1<<6)          /* iNAND devices have broken CMD38 */
>>  #define MMC_QUIRK_BLK_NO_CMD23 (1<<7)          /* Avoid CMD23 for regular multiblock */
>> +       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 */
>> @@ -325,6 +330,20 @@ 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_powernotify_on(c)     \
>> +               ((c)->poweroff_notify_state == MMC_POWERED_ON)
>> +#define mmc_card_powernotify_off(c)    \
>> +               ((c)->poweroff_notify_state == MMC_NO_POWER_NOTIFICATION)
>> +
>> +#define mmc_card_set_powernotify_off(c)    \
>> +               ((c)->poweroff_notify_state = MMC_NO_POWER_NOTIFICATION)
>> +#define mmc_card_set_powernotify_on(c) \
>> +               ((c)->poweroff_notify_state = MMC_POWERED_ON)
>> +#define mmc_card_set_powernotify_short(c)  \
>> +               ((c)->poweroff_notify_state = MMC_POWEROFF_SHORT)
>> +#define mmc_card_set_powernotify_long(c)   \
>> +               ((c)->poweroff_notify_state = MMC_POWEROFF_LONG)
>> +
>>  /*
>>  * Quirk add/remove for MMC products.
>>  */
>> diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
>> index cf2dadc..4f24702 100644
>> --- a/include/linux/mmc/host.h
>> +++ b/include/linux/mmc/host.h
>> @@ -232,6 +232,10 @@ struct mmc_host {
>>  #define MMC_CAP_POWER_OFF_NOTIFY    (1 << 31)/*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
>
>> +#define MMC_NO_POWER_NOTIFICATION  0
>> +#define MMC_POWERED_ON     1
>> +#define MMC_POWEROFF_SHORT 2
>> +#define MMC_POWEROFF_LONG  3
>
> I think you can make one macros.
but these macros are in 2 different contexts  card and host.
if i make it a single macro pls suggest me a better place to define.
should it be host.h or card.h?


>
>>
>>  #ifdef CONFIG_MMC_CLKGATE
>>        int                     clk_requests;   /* internal reference counter */
>> --
>> 1.7.1
>>
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