[PATCH 5.7 093/124] scsi: ufs: Add quirk to fix mishandling utrlclr/utmrlclr

Greg Kroah-Hartman
2020-08-24T08:43:01Z

From: Alim Akhtar <alim.akhtar@samsung.com>

[ Upstream commit 871838412adf533ffda0b4a0ede0c2984e3511e7 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/scsi/ufs/ufshcd.c | 11 +++++++++--
drivers/scsi/ufs/ufshcd.h | 5 +++++
2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 2c02967f159ea..9e31f9569bf78 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -647,7 +647,11 @@ 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);
}

/**
@@ -657,7 +661,10 @@ 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);
}

/**
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index 2315ecc209272..ceadbd548e06d 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -518,6 +518,11 @@ 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 {
--
2.25.1