[PATCH V6 RESEND 2/2] mmc: core: Add Poweroff Notify handling eMMC 4.5

Girish K S
2011-09-16T13:39:47Z

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@linaro.org>
---
drivers/mmc/core/core.c | 34 ++++++++++++++++++++++++++++++++++
drivers/mmc/core/mmc.c | 5 ++++-
drivers/mmc/host/sdhci.c | 10 ++++++++++
include/linux/mmc/card.h | 19 +++++++++++++++++++
include/linux/mmc/host.h | 4 ++++
5 files changed, 71 insertions(+), 1 deletions(-)

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 91a0a74..157060f 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -1130,9 +1130,41 @@ 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 (card != NULL && 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);
+
+ /*Set the card state to no notification after the poweroff*/
+ mmc_card_set_powernotify_off(card);
+ }
+
/*
* Reset ocr mask to be the highest possible voltage supported for
* this mmc host. This value will be used at next power up.
@@ -2022,6 +2054,7 @@ 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);

@@ -2044,6 +2077,7 @@ 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..63cc77b 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -715,7 +715,8 @@ 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,
@@ -724,6 +725,8 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
goto free_card;
}

+ if (!err)
+ mmc_card_set_powernotify_on(card);
/*
* Activate high speed (if supported)
*/
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 0e02cc1..92ea734 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)
+ 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

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