Sleep notification is supported since eMMC5.0.
Signed-off-by: Jaehoon Chung <jh80.chung@xxxxxxxxxxx>
---
drivers/mmc/core/mmc.c | 30 +++++++++++++++++++++++++++---
include/linux/mmc/card.h | 2 ++
include/linux/mmc/mmc.h | 2 ++
3 files changed, 31 insertions(+), 3 deletions(-)
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index f631f5a..8c3cce0 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -534,7 +534,7 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
else
card->erased_byte = 0x0;
- /* eMMC v4.5 or later */
+ /* eMMC v4.5 */
if (card->ext_csd.rev >= 6) {
card->ext_csd.feature_support |= MMC_DISCARD_FEATURE;
@@ -571,6 +571,16 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
card->ext_csd.data_sector_size = 512;
}
+ /* eMMC v5.0 or later */
+ if (card->ext_csd.rev >= 7) {
+ card->ext_csd.raw_sleep_noti_time =
+ ext_csd[EXT_CSD_SLEEP_NOTIFICATION_TIME];
+ if (card->ext_csd.raw_sleep_noti_time > 0 &&
+ card->ext_csd.raw_sleep_noti_time <= 0x17)
+ card->ext_csd.sleep_notification_time =
+ (2 << card->ext_csd.raw_sleep_noti_time)
+ / USEC_PER_MSEC;
+ }
out:
return err;
}
@@ -1390,6 +1400,11 @@ static int mmc_sleep(struct mmc_host *host)
return err;
}
+static int mmc_can_sleep_notify(const struct mmc_card *card)
+{
+ return card && mmc_card_mmc(card) && card->ext_csd.raw_sleep_noti_time;
+}
+
static int mmc_can_poweroff_notify(const struct mmc_card *card)
{
return card &&
@@ -1405,6 +1420,8 @@ static int mmc_poweroff_notify(struct mmc_card *card, unsigned int notify_type)
/* Use EXT_CSD_POWER_OFF_SHORT as default notification type. */
if (notify_type == EXT_CSD_POWER_OFF_LONG)
timeout = card->ext_csd.power_off_longtime;
+ else if (notify_type == EXT_CSD_SLEEP_NOTIFICATION)
+ timeout = card->ext_csd.sleep_notification_time;
err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_POWER_OFF_NOTIFICATION,
@@ -1495,9 +1512,16 @@ static int _mmc_suspend(struct mmc_host *host, bool is_suspend)
if (mmc_can_poweroff_notify(host->card) &&
((host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) || !is_suspend))
err = mmc_poweroff_notify(host->card, notify_type);
- else if (mmc_can_sleep(host->card))
+ else if (mmc_can_sleep(host->card)) {
+ if (mmc_can_poweroff_notify(host->card) &&
+ mmc_can_sleep_notify(host->card) && is_suspend) {
+ err = mmc_poweroff_notify(host->card,
+ EXT_CSD_SLEEP_NOTIFICATION);
+ if (err)
+ goto out;
+ }
err = mmc_sleep(host);
- else if (!mmc_host_is_spi(host))
+ } else if (!mmc_host_is_spi(host))
err = mmc_deselect_cards(host);
host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200);
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index 176fdf8..ca568a7 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -62,6 +62,7 @@ struct mmc_ext_csd {
unsigned int generic_cmd6_time; /* Units: 10ms */
unsigned int power_off_longtime; /* Units: ms */
u8 power_off_notification; /* state */
+ unsigned int sleep_notification_time;/* Units: 10us */
unsigned int hs_max_dtr;
#define MMC_HIGH_26_MAX_DTR 26000000
#define MMC_HIGH_52_MAX_DTR 52000000
@@ -98,6 +99,7 @@ struct mmc_ext_csd {
u8 raw_pwr_cl_26_195; /* 201 */
u8 raw_pwr_cl_52_360; /* 202 */
u8 raw_pwr_cl_26_360; /* 203 */
+ u8 raw_sleep_noti_time; /* 216 */
u8 raw_s_a_timeout; /* 217 */
u8 raw_hc_erase_gap_size; /* 221 */
u8 raw_erase_timeout_mult; /* 223 */
diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
index 50bcde3..229ba16 100644
--- a/include/linux/mmc/mmc.h
+++ b/include/linux/mmc/mmc.h
@@ -307,6 +307,7 @@ struct _mmc_csd {
#define EXT_CSD_PWR_CL_52_360 202 /* RO */
#define EXT_CSD_PWR_CL_26_360 203 /* RO */
#define EXT_CSD_SEC_CNT 212 /* RO, 4 bytes */
+#define EXT_CSD_SLEEP_NOTIFICATION_TIME 216 /* Ro */
#define EXT_CSD_S_A_TIMEOUT 217 /* RO */
#define EXT_CSD_REL_WR_SEC_C 222 /* RO */
#define EXT_CSD_HC_WP_GRP_SIZE 221 /* RO */
@@ -385,6 +386,7 @@ struct _mmc_csd {
#define EXT_CSD_POWER_ON 1
#define EXT_CSD_POWER_OFF_SHORT 2
#define EXT_CSD_POWER_OFF_LONG 3
+#define EXT_CSD_SLEEP_NOTIFICATION 4
#define EXT_CSD_PWR_CL_8BIT_MASK 0xF0 /* 8 bit PWR CLS */
#define EXT_CSD_PWR_CL_4BIT_MASK 0x0F /* 8 bit PWR CLS */
--
1.7.9.5
--
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