[v6,01/10] scsi: ufs: add quirk to fix mishandling utrlclr/utmrlclr

Message ID 20200417175944.47189-2-alim.akhtar@samsung.com
State New
Headers show
Series
  • [v6,01/10] scsi: ufs: add quirk to fix mishandling utrlclr/utmrlclr
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Commit Message

Alim Akhtar April 17, 2020, 5:59 p.m.
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.

Signed-off-by: Seungwon Jeon <essuuj@gmail.com>
Signed-off-by: Alim Akhtar <alim.akhtar@samsung.com>
---
 drivers/scsi/ufs/ufshcd.c | 11 +++++++++--
 drivers/scsi/ufs/ufshcd.h |  5 +++++
 2 files changed, 14 insertions(+), 2 deletions(-)


base-commit: 8f3d9f354286745c751374f5f1fcafee6b3f3136

Patch

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 698e8d20b4ba..3655b88fc862 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -645,7 +645,11 @@  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);
 }
 
 /**
@@ -655,7 +659,10 @@  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 6ffc08ad85f6..071f0edf3f64 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 {