From: jongmin jeong <jjmin.jeong@samsung.com>
Date: Mon, 18 Oct 2021 21:42:02 +0900
Subject: [PATCH] scsi: ufs: Add quirk to handle broken UIC command
Git-commit: a22bcfdbf10b4182e94ae98a641efa676170feaf
Patch-mainline: v5.16-rc1
References: jsc#PED-818
Samsung ExynosAuto v9 SoC has two types of host controller interface to
support the virtualization of UFS Device. One is the physical host (PH)
that is the same as conventional UFSHCI, and the other is the virtual host
(VH) that supports data transfer function only.
In this configuration the virtual host does not support UIC commands. Add a
quirk to return 0 when the UIC command send function is called.
Link: https://lore.kernel.org/r/20211018124216.153072-2-chanho61.park@samsung.com
Cc: Alim Akhtar <alim.akhtar@samsung.com>
Cc: James E.J. Bottomley <jejb@linux.ibm.com>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: jongmin jeong <jjmin.jeong@samsung.com>
Signed-off-by: Chanho Park <chanho61.park@samsung.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Hannes Reinecke <hare@suse.com>
---
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 04cb67995750..dc7ce9eef0c7 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -2330,6 +2330,9 @@ 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 3f5dc6732fe1..e67181a013e3 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -589,6 +589,12 @@ 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 {
--
2.35.3