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>
---
v2:
adds poweroff notification handling in suspend/normal
v4:
updated with review comments of Jeon
v5:
This patch version fixes the problem with power off
notify function, when called for the first time and
card is not yet initialised.
v6:
fixes checkpatch errors. The patches are generated after
rebasing to chris's mmc-next branch.
drivers/mmc/core/core.c | 35 ++++++++++++++++++++++++++++++++++-
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(+), 2 deletions(-)
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index f22b774..17841a8 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -1198,11 +1198,42 @@ static void mmc_power_up(struct mmc_host *host)
void mmc_power_off(struct mmc_host *host)
{
- mmc_host_clk_hold(host);
+ struct mmc_card *card = host->card;
+ unsigned int notify_type;
+ unsigned int timeout;
+ int err;
+ mmc_host_clk_hold(host);
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.
@@ -2195,6 +2226,7 @@ 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);
@@ -2218,6 +2250,7 @@ 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 a547f49..e3695a0 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -720,7 +720,8 @@ 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,
@@ -729,6 +730,8 @@ 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 d66a7a1..04abd45 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -2575,6 +2575,16 @@ 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 0f9dbd6..3bc1995 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -192,6 +192,11 @@ 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 */
@@ -327,6 +332,20 @@ 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 ed49e88..d8a3a72 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -238,6 +238,10 @@ 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
--
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