linux-kernel - [PATCH 2/3] scsi: ufs: add quirk to enable host controller without interface configuration

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Date:   Thu, 27 May 2021 12:09:00 +0900
From:   jongmin jeong <jjmin.jeong@...sung.com>
To:     jejb@...ux.ibm.com, martin.petersen@...cle.com
Cc:     alim.akhtar@...sung.com, avri.altman@....com, cang@...eaurora.org,
        beanhuo@...ron.com, adrian.hunter@...el.com,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        jjmin.jeong@...sung.com
Subject: [PATCH 2/3] scsi: ufs: add quirk to enable host controller without
 interface configuration

samsung ExynosAuto 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 like device management.
This patch skips the interface configuration part that cannot be performed
in the virtual host.

Change-Id: I65b56f898da9d57c627b5752535dd563e4fd3e8d
Signed-off-by: jongmin jeong <jjmin.jeong@...sung.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 ec663cb58233..4787e40c6a2d 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -7975,6 +7975,9 @@ static int ufshcd_probe_hba(struct ufs_hba *hba, bool async)
 	if (ret)
 		goto out;
 
+	if (hba->quirks & UFSHCD_QUIRK_SKIP_INTERFACE_CONFIGURATION)
+		goto out;
+
 	/* Debug counters initialization */
 	ufshcd_clear_dbg_ufs_stats(hba);
 
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index 4a929bf7cf8e..0ab4c296be32 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -575,6 +575,12 @@ enum ufshcd_quirks {
 	 * support UIC command
 	 */
 	UFSHCD_QUIRK_BROKEN_UIC_CMD			= 1 << 15,
+
+	/*
+	 * This quirk needs to be enabled if the host controller cannot
+	 * support interface configuration.
+	 */
+	UFSHCD_QUIRK_SKIP_INTERFACE_CONFIGURATION	= 1 << 16,
 };
 
 enum ufshcd_caps {
-- 
2.31.1