diff options
| author | Yaniv Gardi <ygardi@codeaurora.org> | 2016-03-10 17:37:18 +0200 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2016-03-14 21:04:45 -0400 |
| commit | b799fdf754b5c6c4dad0016826fb6b3e79bccaea (patch) | |
| tree | 8c096ba12a883e3b1e93b215c44fe88e333bc20c /drivers/scsi/ufs/ufshcd.c | |
| parent | f3099fbd9b90f94849bd155ebf690dd5a8cfa477 (diff) | |
scsi: ufs: add device quirk delay before putting UFS rails in LPM
We put the UFS device in sleep state & UFS link in hibern8 state during
runtime suspend. After this we put all the UFS rails in low power
modes immediately but it seems some devices may still draw more than
sleep current from UFS rails (especially from VCCQ rail) at-least for
500us.
To avoid this situation, this change adds 2ms delay before putting
these UFS rails in LPM mode.
Reviewed-by: Gilad Broner <gbroner@codeaurora.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>
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 | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 93cc02f2d48e..f8fa72c31a9d 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -5716,6 +5716,16 @@ out: static void ufshcd_vreg_set_lpm(struct ufs_hba *hba) { /* + * It seems some UFS devices may keep drawing more than sleep current + * (atleast for 500us) from UFS rails (especially from VCCQ rail). + * To avoid this situation, add 2ms delay before putting these UFS + * rails in LPM mode. + */ + if (!ufshcd_is_link_active(hba) && + hba->dev_quirks & UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM) + usleep_range(2000, 2100); + + /* * If UFS device is either in UFS_Sleep turn off VCC rail to save some * power. * |