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scsi: ufs: add quirk to fix mishandling utrlclr/utmrlclr 

In the right behavior, setting the bit to '0' indicates clear and '1'
indicates no change. If host controller handles this the other way,
UFSHCI_QUIRK_BROKEN_REQ_LIST_CLR can be used.

[mkp: typo]

Signed-off-by: Seungwon Jeon <essuuj@gmail.com>
Signed-off-by: Alim Akhtar <alim.akhtar@samsung.com>
Reviewed-by: Subhash Jadavani <subhashj@codeaurora.org>
Reviewed-by: "Asutosh Das (asd)" <asutoshd@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Alim Akhtar 2018-05-06 15:44:15 +05:30 committed by Martin K. Petersen
parent bbe21d7a97
commit 1399c5b02c
2 changed files with 24 additions and 2 deletions
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21
drivers/scsi/ufs/ufshcd.c
View File

@ -643,7 +643,24 @@ static inline void ufshcd_put_tm_slot(struct ufs_hba *hba, int slot)
*/
static inline void ufshcd_utrl_clear(struct ufs_hba *hba, u32 pos)
{
ufshcd_writel(hba, ~(1 << pos), REG_UTP_TRANSFER_REQ_LIST_CLEAR);
if (hba->quirks & UFSHCI_QUIRK_BROKEN_REQ_LIST_CLR)
ufshcd_writel(hba, (1 << pos), REG_UTP_TRANSFER_REQ_LIST_CLEAR);
else
ufshcd_writel(hba, ~(1 << pos),
REG_UTP_TRANSFER_REQ_LIST_CLEAR);
}
/**
* ufshcd_utmrl_clear - Clear a bit in UTRMLCLR register
* @hba: per adapter instance
* @pos: position of the bit to be cleared
*/
static inline void ufshcd_utmrl_clear(struct ufs_hba *hba, u32 pos)
{
if (hba->quirks & UFSHCI_QUIRK_BROKEN_REQ_LIST_CLR)
ufshcd_writel(hba, (1 << pos), REG_UTP_TASK_REQ_LIST_CLEAR);
else
ufshcd_writel(hba, ~(1 << pos), REG_UTP_TASK_REQ_LIST_CLEAR);
}
/**
@ -5362,7 +5379,7 @@ static int ufshcd_clear_tm_cmd(struct ufs_hba *hba, int tag)
goto out;
spin_lock_irqsave(hba->host->host_lock, flags);
ufshcd_writel(hba, ~(1 << tag), REG_UTP_TASK_REQ_LIST_CLEAR);
ufshcd_utmrl_clear(hba, tag);
spin_unlock_irqrestore(hba->host->host_lock, flags);
/* poll for max. 1 sec to clear door bell register by h/w */

5
drivers/scsi/ufs/ufshcd.h
View File

@ -595,6 +595,11 @@ struct ufs_hba {
*/
#define UFSHCD_QUIRK_PRDT_BYTE_GRAN 0x80
/*
* Clear handling for transfer/task request list is just opposite.
*/
#define UFSHCI_QUIRK_BROKEN_REQ_LIST_CLR 0x100
unsigned int quirks; /* Deviations from standard UFSHCI spec. */
/* Device deviations from standard UFS device spec. */