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

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

Link: https://lore.kernel.org/r/20200528011658.71590-2-alim.akhtar@samsung.com
Reviewed-by: Can Guo <cang@codeaurora.org>
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Signed-off-by: Seungwon Jeon <essuuj@gmail.com>
Signed-off-by: Alim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Alim Akhtar 2020-05-28 06:46:49 +05:30 committed by Martin K. Petersen
parent b3a9e3b962
commit 871838412a
2 changed files with 14 additions and 2 deletions
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11
drivers/scsi/ufs/ufshcd.c
View File

@ -672,7 +672,11 @@ static inline int ufshcd_get_tr_ocs(struct ufshcd_lrb *lrbp)
*/
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);
}
/**
@ -682,7 +686,10 @@ static inline void ufshcd_utrl_clear(struct ufs_hba *hba, u32 pos)
*/
static inline void ufshcd_utmrl_clear(struct ufs_hba *hba, u32 pos)
{
ufshcd_writel(hba, ~(1 << pos), REG_UTP_TASK_REQ_LIST_CLEAR);
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);
}
/**

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

@ -520,6 +520,11 @@ enum ufshcd_quirks {
* ops (get_ufs_hci_version) to get the correct version.
*/
UFSHCD_QUIRK_BROKEN_UFS_HCI_VERSION = 1 << 5,
/*
* Clear handling for transfer/task request list is just opposite.
*/
UFSHCI_QUIRK_BROKEN_REQ_LIST_CLR = 1 << 6,
};
enum ufshcd_caps {