diff options
| author | Stanley Chu <stanley.chu@mediatek.com> | 2020-07-29 13:18:39 +0800 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2020-07-30 21:10:29 -0400 |
| commit | c4df6eed972e001a206a173738bec8c5f903257a (patch) | |
| tree | d28d8dff97185a5c892230524154769322d622ca /drivers/scsi/ufs/ufshcd.c | |
| parent | bb2e33146876306d5623080e008f61e96e407590 (diff) | |
scsi: ufs: Introduce device quirk "DELAY_AFTER_LPM"
Some UFS devices require delay after VCC power rail is turned off.
Introduce a device quirk "DELAY_AFTER_LPM" to add 5ms delay after VCC
power-off during suspend flow.
Link: https://lore.kernel.org/r/20200729051840.31318-2-stanley.chu@mediatek.com
Reviewed-by: Andy Teng <andy.teng@mediatek.com>
Reviewed-by: Peter Wang <peter.wang@mediatek.com>
Reviewed-by: Can Guo <cang@codeaurora.org>
Acked-by: Avri Altman <Avri.Altman@wdc.com>
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/ufs/ufshcd.c')
| -rw-r--r-- | drivers/scsi/ufs/ufshcd.c | 11 |
1 files changed, 11 insertions, 0 deletions
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) |