linux-kernel - [PATCH 3/3] scsi: ufs: add quirk to support host reset only

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Date:   Thu, 27 May 2021 12:09:01 +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 3/3] scsi: ufs: add quirk to support host reset only

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 support host reset handler only.
This patch calls the host reset handler when abort or device reset handler
has occured in the virtual host.

Change-Id: I3f07e772415a35fe1e7374e02b3c37ef0bf5660d
Signed-off-by: jongmin jeong <jjmin.jeong@...sung.com>
---
 drivers/scsi/ufs/ufshcd.c | 7 +++++++
 drivers/scsi/ufs/ufshcd.h | 6 ++++++
 2 files changed, 13 insertions(+)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 4787e40c6a2d..9d1912290f87 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -6826,6 +6826,9 @@ static int ufshcd_eh_device_reset_handler(struct scsi_cmnd *cmd)
 	u8 resp = 0xF, lun;
 	unsigned long flags;
 
+	if (hba->quirks & UFSHCD_QUIRK_BROKEN_RESET_HANDLER)
+		return ufshcd_eh_host_reset_handler(cmd);
+
 	host = cmd->device->host;
 	hba = shost_priv(host);
 
@@ -6972,6 +6975,10 @@ static int ufshcd_abort(struct scsi_cmnd *cmd)
 	host = cmd->device->host;
 	hba = shost_priv(host);
 	tag = cmd->request->tag;
+
+	if (hba->quirks & UFSHCD_QUIRK_BROKEN_RESET_HANDLER)
+		return ufshcd_eh_host_reset_handler(cmd);
+
 	lrbp = &hba->lrb[tag];
 	if (!ufshcd_valid_tag(hba, tag)) {
 		dev_err(hba->dev,
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index 0ab4c296be32..82a9c6889978 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -581,6 +581,12 @@ enum ufshcd_quirks {
 	 * support interface configuration.
 	 */
 	UFSHCD_QUIRK_SKIP_INTERFACE_CONFIGURATION	= 1 << 16,
+
+	/*
+	 * This quirk needs to be enabled if the host controller support
+	 * host reset handler only.
+	 */
+	UFSHCD_QUIRK_BROKEN_RESET_HANDLER		= 1 << 17,
 };
 
 enum ufshcd_caps {
-- 
2.31.1