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scsi: ufs: add quirk to disallow reset of interrupt aggregation 

Some host controllers support interrupt aggregation but don't allow
resetting counter and timer in software.

Signed-off-by: Seungwon Jeon <essuuj@gmail.com>
Signed-off-by: Alim Akhtar <alim.akhtar@samsung.com>
Reviewed-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Alim Akhtar 2018-05-06 15:44:16 +05:30 committed by Martin K. Petersen
parent 1399c5b02c
commit 5ac6abc941
2 changed files with 8 additions and 1 deletions
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3
drivers/scsi/ufs/ufshcd.c
View File

@ -4659,7 +4659,8 @@ static void ufshcd_transfer_req_compl(struct ufs_hba *hba)
* false interrupt if device completes another request after resetting
* aggregation and before reading the DB.
*/
if (ufshcd_is_intr_aggr_allowed(hba))
if (ufshcd_is_intr_aggr_allowed(hba) &&
!(hba->quirks & UFSHCI_QUIRK_SKIP_RESET_INTR_AGGR))
ufshcd_reset_intr_aggr(hba);
tr_doorbell = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);

6
drivers/scsi/ufs/ufshcd.h
View File

@ -600,6 +600,12 @@ struct ufs_hba {
*/
#define UFSHCI_QUIRK_BROKEN_REQ_LIST_CLR 0x100
/*
* This quirk needs to be enabled if host controller doesn't allow
* that the interrupt aggregation timer and counter are reset by s/w.
*/
#define UFSHCI_QUIRK_SKIP_RESET_INTR_AGGR 0x200
unsigned int quirks; /* Deviations from standard UFSHCI spec. */
/* Device deviations from standard UFS device spec. */