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UPSTREAM: scsi: ufs: Re-enable WriteBooster after device reset

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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>
(cherry picked from commit bd14bf0e4a084514aa62d24d2109e0f09a93822f)
Bug: 187129171
Signed-off-by: Connor O'Brien <connoro@google.com>
Change-Id: I994290c3824cac50828e097cdfb4a93e9dcfeb36
This commit is contained in:
Stanley Chu 2020-12-08 21:56:34 +08:00 committed by Connor O'Brien
parent b55ed54016
commit 2e09274b7c
1 changed files with 4 additions and 0 deletions
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4
drivers/scsi/ufs/ufshcd.h
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@ -1266,6 +1266,10 @@ static inline void ufshcd_vops_device_reset(struct ufs_hba *hba)
if (hba->vops && hba->vops->device_reset) {
hba->vops->device_reset(hba);
ufshcd_set_ufs_dev_active(hba);
if (ufshcd_is_wb_allowed(hba)) {
hba->wb_enabled = false;
hba->wb_buf_flush_enabled = false;
}
ufshcd_update_reg_hist(&hba->ufs_stats.dev_reset, 0);
}
}