linux-kernel - [PATCH v10 01/10] scsi: ufs: add quirk to fix mishandling utrlclr/utmrlclr

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Date:   Thu, 28 May 2020 06:46:49 +0530
From:   Alim Akhtar <alim.akhtar@...sung.com>
To:     robh@...nel.org
Cc:     devicetree@...r.kernel.org, linux-scsi@...r.kernel.org,
        krzk@...nel.org, avri.altman@....com, martin.petersen@...cle.com,
        kwmad.kim@...sung.com, stanley.chu@...iatek.com,
        cang@...eaurora.org, linux-samsung-soc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Alim Akhtar <alim.akhtar@...sung.com>
Subject: [PATCH v10 01/10] 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.

Reviewed-by: Can Guo <cang@...eaurora.org>
Reviewed-by: Avri Altman <avri.altman@....com>
Signed-off-by: Seungwon Jeon <essuuj@...il.com>
Signed-off-by: Alim Akhtar <alim.akhtar@...sung.com>
---
 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 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 {
-- 
2.17.1