From: jongmin jeong <redacted>

samsung ExynosAuto9 SoC has two types of host controller interface to
support the virtualization of UFS Device.
One is the physical host(PH) that the same as conventaional UFSHCI,
and the other is the virtual host(VH) that support data transfer function
only.

In this structure, the virtual host does not support UIC command.
To support this, we add the quirk and return 0 when the UIC command
send function is called.

Cc: Alim Akhtar <alim.akhtar@samsung.com>
Cc: James E.J. Bottomley <redacted>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: jongmin jeong <redacted>
Signed-off-by: Chanho Park <redacted>
---
 drivers/scsi/ufs/ufshcd.c | 3 +++
 drivers/scsi/ufs/ufshcd.h | 6 ++++++
 2 files changed, 9 insertions(+)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 3841ab49f556..8a45e8c05965 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c

@@ -2324,6 +2324,9 @@ int ufshcd_send_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd)
 	int ret;
 	unsigned long flags;
 
+	if (hba->quirks & UFSHCD_QUIRK_BROKEN_UIC_CMD)
+		return 0;
+
 	ufshcd_hold(hba, false);
 	mutex_lock(&hba->uic_cmd_mutex);
 	ufshcd_add_delay_before_dme_cmd(hba);

diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index 52ea6f350b18..e1d8fd432614 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h

@@ -588,6 +588,12 @@ enum ufshcd_quirks {
 	 * This quirk allows only sg entries aligned with page size.
 	 */
 	UFSHCD_QUIRK_ALIGN_SG_WITH_PAGE_SIZE		= 1 << 14,
+
+	/*
+	 * This quirk needs to be enabled if the host controller does not
+	 * support UIC command
+	 */
+	UFSHCD_QUIRK_BROKEN_UIC_CMD			= 1 << 15,
 };
 
 enum ufshcd_caps {

-- 
2.33.0