From: Stanley Chu stanley.chu@mediatek.com
[ Upstream commit bd14bf0e4a084514aa62d24d2109e0f09a93822f ]
UFS 3.1 specification mentions that the WriteBooster flags listed below will be set to their default values, i.e. disabled, after power cycle or any type of reset event. Thus we need to reset the flag variables kept in struct hba to align with the device status and ensure that WriteBooster-related functions are configured properly after device reset.
Without this fix, WriteBooster will not be enabled successfully after by ufshcd_wb_ctrl() after device reset because hba->wb_enabled remains true.
Flags required to be reset to default values:
- fWriteBoosterEn: hba->wb_enabled
- fWriteBoosterBufferFlushEn: hba->wb_buf_flush_enabled
- fWriteBoosterBufferFlushDuringHibernate: No variable mapped
Link: https://lore.kernel.org/r/20201208135635.15326-2-stanley.chu@mediatek.com Fixes: 3d17b9b5ab11 ("scsi: ufs: Add write booster feature support") Reviewed-by: Bean Huo beanhuo@micron.com Signed-off-by: Stanley Chu stanley.chu@mediatek.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/scsi/ufs/ufshcd.h | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index de97971e2d865..cd51553e522da 100644 --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -1183,8 +1183,13 @@ static inline void ufshcd_vops_device_reset(struct ufs_hba *hba) if (hba->vops && hba->vops->device_reset) { int err = hba->vops->device_reset(hba);
- if (!err) + if (!err) { ufshcd_set_ufs_dev_active(hba); + if (ufshcd_is_wb_allowed(hba)) { + hba->wb_enabled = false; + hba->wb_buf_flush_enabled = false; + } + } if (err != -EOPNOTSUPP) ufshcd_update_reg_hist(&hba->ufs_stats.dev_reset, err); }