Some UFS host controllers may clear a transfer request slot
by setting an associated bit in UTRLCLR/UTMRLCLR to 1, not 0.
That's opposite to what UFS spec describes.
Signed-off-by: Kiwoong Kim <kwmad.kim@xxxxxxxxxxx>
---
drivers/scsi/ufs/ufshcd.c | 28 ++++++++++++++++++++++++++--
drivers/scsi/ufs/ufshcd.h | 7 +++++++
2 files changed, 33 insertions(+), 2 deletions(-)
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index d6e3112..c9cf011 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -392,7 +392,31 @@ 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);
+ u32 clear;
+
+ if (hba->quirks & UFSHCD_QUIRK_BROKEN_REQ_LIST_CLR)
+ clear = (1 << pos);
+ else
+ clear = ~(1 << pos);
+
+ ufshcd_writel(hba, clear, 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)
+{
+ u32 clear;
+
+ if (hba->quirks & UFSHCD_QUIRK_BROKEN_REQ_LIST_CLR)
+ clear = (1 << pos);
+ else
+ clear = ~(1 << pos);
+
+ ufshcd_writel(hba, clear, REG_UTP_TASK_REQ_LIST_CLEAR);
}
/**
@@ -4312,7 +4336,7 @@ 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 */
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index 7d9ff22..9838598 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -491,6 +491,13 @@ struct ufs_hba {
*/
#define UFSHCD_QUIRK_PRDT_BYTE_GRAN UFS_BIT(7)
+ /*
+ * This quirk needs to be enabled if the host contoller has to set
+ * the bit corresponding the slot to be cleared to 1, not 0 as
+ * described in UFS spec.
+ */
+ #define UFSHCD_QUIRK_BROKEN_REQ_LIST_CLR UFS_BIT(8)
+
unsigned int quirks; /* Deviations from standard UFSHCI spec. */
/* Device deviations from standard UFS device spec. */
--
2.1.4
--
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