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scsi: ufs-pci: Fix recovery from hibernate exit errors for Intel controllers 

Intel controllers can end up in an unrecoverable state after a hibernate
exit error unless a full reset and restore is done before anything else.
Force that to happen.

Link: https://lore.kernel.org/r/20201207083120.26732-4-adrian.hunter@intel.com
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Adrian Hunter 2020-12-07 10:31:19 +02:00 committed by Martin K. Petersen
parent af423534d2
commit 044d5bda71
1 changed files with 17 additions and 0 deletions
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17
drivers/scsi/ufs/ufshcd-pci.c
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@ -178,6 +178,23 @@ static int ufs_intel_resume(struct ufs_hba *hba, enum ufs_pm_op op)
REG_UTP_TASK_REQ_LIST_BASE_L);
ufshcd_writel(hba, upper_32_bits(hba->utmrdl_dma_addr),
REG_UTP_TASK_REQ_LIST_BASE_H);
if (ufshcd_is_link_hibern8(hba)) {
int ret = ufshcd_uic_hibern8_exit(hba);
if (!ret) {
ufshcd_set_link_active(hba);
} else {
dev_err(hba->dev, "%s: hibern8 exit failed %d\n",
__func__, ret);
/*
* Force reset and restore. Any other actions can lead
* to an unrecoverable state.
*/
ufshcd_set_link_off(hba);
}
}
return 0;
}