diff options
| -rw-r--r-- | drivers/scsi/ufs/ufs_quirks.h | 7 | ||||
| -rw-r--r-- | drivers/scsi/ufs/ufshcd.c | 11 |
2 files changed, 18 insertions, 0 deletions
diff --git a/drivers/scsi/ufs/ufs_quirks.h b/drivers/scsi/ufs/ufs_quirks.h index 2a0041493e30..07f559ac5883 100644 --- a/drivers/scsi/ufs/ufs_quirks.h +++ b/drivers/scsi/ufs/ufs_quirks.h @@ -109,4 +109,11 @@ struct ufs_dev_fix { */ #define UFS_DEVICE_QUIRK_SUPPORT_EXTENDED_FEATURES (1 << 10) +/* + * Some UFS devices require delay after VCC power rail is turned-off. + * Enable this quirk to introduce 5ms delays after VCC power-off during + * suspend flow. + */ +#define UFS_DEVICE_QUIRK_DELAY_AFTER_LPM (1 << 11) + #endif /* UFS_QUIRKS_H_ */ diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index cdff7e5ee588..307622284239 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -8107,6 +8107,8 @@ out: static void ufshcd_vreg_set_lpm(struct ufs_hba *hba) { + bool vcc_off = false; + /* * It seems some UFS devices may keep drawing more than sleep current * (atleast for 500us) from UFS rails (especially from VCCQ rail). @@ -8135,13 +8137,22 @@ static void ufshcd_vreg_set_lpm(struct ufs_hba *hba) if (ufshcd_is_ufs_dev_poweroff(hba) && ufshcd_is_link_off(hba) && !hba->dev_info.is_lu_power_on_wp) { ufshcd_setup_vreg(hba, false); + vcc_off = true; } else if (!ufshcd_is_ufs_dev_active(hba)) { ufshcd_toggle_vreg(hba->dev, hba->vreg_info.vcc, false); + vcc_off = true; if (!ufshcd_is_link_active(hba)) { ufshcd_config_vreg_lpm(hba, hba->vreg_info.vccq); ufshcd_config_vreg_lpm(hba, hba->vreg_info.vccq2); } } + + /* + * Some UFS devices require delay after VCC power rail is turned-off. + */ + if (vcc_off && hba->vreg_info.vcc && + hba->dev_quirks & UFS_DEVICE_QUIRK_DELAY_AFTER_LPM) + usleep_range(5000, 5100); } static int ufshcd_vreg_set_hpm(struct ufs_hba *hba) |