diff options
Diffstat (limited to 'drivers/scsi')
| -rw-r--r-- | drivers/scsi/ufs/ufs-sysfs.c | 7 | ||||
| -rw-r--r-- | drivers/scsi/ufs/ufs.h | 1 | ||||
| -rw-r--r-- | drivers/scsi/ufs/ufshcd.c | 39 | ||||
| -rw-r--r-- | drivers/scsi/ufs/ufshcd.h | 17 |
4 files changed, 61 insertions, 3 deletions
diff --git a/drivers/scsi/ufs/ufs-sysfs.c b/drivers/scsi/ufs/ufs-sysfs.c index bdcd27faa054..08e72b7eef6a 100644 --- a/drivers/scsi/ufs/ufs-sysfs.c +++ b/drivers/scsi/ufs/ufs-sysfs.c @@ -28,6 +28,7 @@ static const char *ufschd_ufs_dev_pwr_mode_to_string( case UFS_ACTIVE_PWR_MODE: return "ACTIVE"; case UFS_SLEEP_PWR_MODE: return "SLEEP"; case UFS_POWERDOWN_PWR_MODE: return "POWERDOWN"; + case UFS_DEEPSLEEP_PWR_MODE: return "DEEPSLEEP"; default: return "UNKNOWN"; } } @@ -38,6 +39,7 @@ static inline ssize_t ufs_sysfs_pm_lvl_store(struct device *dev, bool rpm) { struct ufs_hba *hba = dev_get_drvdata(dev); + struct ufs_dev_info *dev_info = &hba->dev_info; unsigned long flags, value; if (kstrtoul(buf, 0, &value)) @@ -46,6 +48,11 @@ static inline ssize_t ufs_sysfs_pm_lvl_store(struct device *dev, if (value >= UFS_PM_LVL_MAX) return -EINVAL; + if (ufs_pm_lvl_states[value].dev_state == UFS_DEEPSLEEP_PWR_MODE && + (!(hba->caps & UFSHCD_CAP_DEEPSLEEP) || + !(dev_info->wspecversion >= 0x310))) + return -EINVAL; + spin_lock_irqsave(hba->host->host_lock, flags); if (rpm) hba->rpm_lvl = value; diff --git a/drivers/scsi/ufs/ufs.h b/drivers/scsi/ufs/ufs.h index f8ab16f30fdc..d593edb48767 100644 --- a/drivers/scsi/ufs/ufs.h +++ b/drivers/scsi/ufs/ufs.h @@ -442,6 +442,7 @@ enum ufs_dev_pwr_mode { UFS_ACTIVE_PWR_MODE = 1, UFS_SLEEP_PWR_MODE = 2, UFS_POWERDOWN_PWR_MODE = 3, + UFS_DEEPSLEEP_PWR_MODE = 4, }; #define UFS_WB_BUF_REMAIN_PERCENT(val) ((val) / 10) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 2309253d3101..ee083b96e405 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -163,6 +163,11 @@ struct ufs_pm_lvl_states ufs_pm_lvl_states[] = { {UFS_SLEEP_PWR_MODE, UIC_LINK_HIBERN8_STATE}, {UFS_POWERDOWN_PWR_MODE, UIC_LINK_HIBERN8_STATE}, {UFS_POWERDOWN_PWR_MODE, UIC_LINK_OFF_STATE}, + /* + * For DeepSleep, the link is first put in hibern8 and then off. + * Leaving the link in hibern8 is not supported. + */ + {UFS_DEEPSLEEP_PWR_MODE, UIC_LINK_OFF_STATE}, }; static inline enum ufs_dev_pwr_mode @@ -8297,7 +8302,8 @@ static int ufshcd_link_state_transition(struct ufs_hba *hba, } /* * If autobkops is enabled, link can't be turned off because - * turning off the link would also turn off the device. + * turning off the link would also turn off the device, except in the + * case of DeepSleep where the device is expected to remain powered. */ else if ((req_link_state == UIC_LINK_OFF_STATE) && (!check_for_bkops || !hba->auto_bkops_enabled)) { @@ -8307,6 +8313,9 @@ static int ufshcd_link_state_transition(struct ufs_hba *hba, * put the link in low power mode is to send the DME end point * to device and then send the DME reset command to local * unipro. But putting the link in hibern8 is much faster. + * + * Note also that putting the link in Hibern8 is a requirement + * for entering DeepSleep. */ ret = ufshcd_uic_hibern8_enter(hba); if (ret) { @@ -8439,6 +8448,7 @@ static void ufshcd_hba_vreg_set_hpm(struct ufs_hba *hba) static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op) { int ret = 0; + int check_for_bkops; enum ufs_pm_level pm_lvl; enum ufs_dev_pwr_mode req_dev_pwr_mode; enum uic_link_state req_link_state; @@ -8524,7 +8534,13 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op) } flush_work(&hba->eeh_work); - ret = ufshcd_link_state_transition(hba, req_link_state, 1); + + /* + * In the case of DeepSleep, the device is expected to remain powered + * with the link off, so do not check for bkops. + */ + check_for_bkops = !ufshcd_is_ufs_dev_deepsleep(hba); + ret = ufshcd_link_state_transition(hba, req_link_state, check_for_bkops); if (ret) goto set_dev_active; @@ -8565,11 +8581,25 @@ set_link_active: if (hba->clk_scaling.is_allowed) ufshcd_resume_clkscaling(hba); ufshcd_vreg_set_hpm(hba); + /* + * Device hardware reset is required to exit DeepSleep. Also, for + * DeepSleep, the link is off so host reset and restore will be done + * further below. + */ + if (ufshcd_is_ufs_dev_deepsleep(hba)) { + ufshcd_vops_device_reset(hba); + WARN_ON(!ufshcd_is_link_off(hba)); + } if (ufshcd_is_link_hibern8(hba) && !ufshcd_uic_hibern8_exit(hba)) ufshcd_set_link_active(hba); else if (ufshcd_is_link_off(hba)) ufshcd_host_reset_and_restore(hba); set_dev_active: + /* Can also get here needing to exit DeepSleep */ + if (ufshcd_is_ufs_dev_deepsleep(hba)) { + ufshcd_vops_device_reset(hba); + ufshcd_host_reset_and_restore(hba); + } if (!ufshcd_set_dev_pwr_mode(hba, UFS_ACTIVE_PWR_MODE)) ufshcd_disable_auto_bkops(hba); enable_gating: @@ -8631,6 +8661,9 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op) if (ret) goto disable_vreg; + /* For DeepSleep, the only supported option is to have the link off */ + WARN_ON(ufshcd_is_ufs_dev_deepsleep(hba) && !ufshcd_is_link_off(hba)); + if (ufshcd_is_link_hibern8(hba)) { ret = ufshcd_uic_hibern8_exit(hba); if (!ret) { @@ -8644,6 +8677,8 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op) /* * A full initialization of the host and the device is * required since the link was put to off during suspend. + * Note, in the case of DeepSleep, the device will exit + * DeepSleep due to device reset. */ ret = ufshcd_reset_and_restore(hba); /* diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index 0fbb735bb70c..213be0667b59 100644 --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -114,16 +114,22 @@ enum uic_link_state { ((h)->curr_dev_pwr_mode = UFS_SLEEP_PWR_MODE) #define ufshcd_set_ufs_dev_poweroff(h) \ ((h)->curr_dev_pwr_mode = UFS_POWERDOWN_PWR_MODE) +#define ufshcd_set_ufs_dev_deepsleep(h) \ + ((h)->curr_dev_pwr_mode = UFS_DEEPSLEEP_PWR_MODE) #define ufshcd_is_ufs_dev_active(h) \ ((h)->curr_dev_pwr_mode == UFS_ACTIVE_PWR_MODE) #define ufshcd_is_ufs_dev_sleep(h) \ ((h)->curr_dev_pwr_mode == UFS_SLEEP_PWR_MODE) #define ufshcd_is_ufs_dev_poweroff(h) \ ((h)->curr_dev_pwr_mode == UFS_POWERDOWN_PWR_MODE) +#define ufshcd_is_ufs_dev_deepsleep(h) \ + ((h)->curr_dev_pwr_mode == UFS_DEEPSLEEP_PWR_MODE) /* * UFS Power management levels. - * Each level is in increasing order of power savings. + * Each level is in increasing order of power savings, except DeepSleep + * which is lower than PowerDown with power on but not PowerDown with + * power off. */ enum ufs_pm_level { UFS_PM_LVL_0, /* UFS_ACTIVE_PWR_MODE, UIC_LINK_ACTIVE_STATE */ @@ -132,6 +138,7 @@ enum ufs_pm_level { UFS_PM_LVL_3, /* UFS_SLEEP_PWR_MODE, UIC_LINK_HIBERN8_STATE */ UFS_PM_LVL_4, /* UFS_POWERDOWN_PWR_MODE, UIC_LINK_HIBERN8_STATE */ UFS_PM_LVL_5, /* UFS_POWERDOWN_PWR_MODE, UIC_LINK_OFF_STATE */ + UFS_PM_LVL_6, /* UFS_DEEPSLEEP_PWR_MODE, UIC_LINK_OFF_STATE */ UFS_PM_LVL_MAX }; @@ -599,6 +606,14 @@ enum ufshcd_caps { * This would increase power savings. */ UFSHCD_CAP_AGGR_POWER_COLLAPSE = 1 << 9, + + /* + * This capability allows the host controller driver to use DeepSleep, + * if it is supported by the UFS device. The host controller driver must + * support device hardware reset via the hba->device_reset() callback, + * in order to exit DeepSleep state. + */ + UFSHCD_CAP_DEEPSLEEP = 1 << 10, }; struct ufs_hba_variant_params { |