linux-kernel - [PATCH v6 05/10] scsi: ufs: add quirk to fix abnormal ocs fatal error

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Message-Id: <20200417175944.47189-6-alim.akhtar@samsung.com>
Date:   Fri, 17 Apr 2020 23:29:39 +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 v6 05/10] scsi: ufs: add quirk to fix abnormal ocs fatal
 error

From: Kiwoong Kim <kwmad.kim@...sung.com>

Some architectures determines if fatal error for OCS
occurrs to check status in response upiu. This patch
is to prevent from reporting command results with that.

Signed-off-by: Kiwoong Kim <kwmad.kim@...sung.com>
Signed-off-by: Alim Akhtar <alim.akhtar@...sung.com>
---
 drivers/scsi/ufs/ufshcd.c | 6 ++++++
 drivers/scsi/ufs/ufshcd.h | 6 ++++++
 2 files changed, 12 insertions(+)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index b32fcedcdcb9..8c07caff0a5c 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -4794,6 +4794,12 @@ ufshcd_transfer_rsp_status(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
 	/* overall command status of utrd */
 	ocs = ufshcd_get_tr_ocs(lrbp);
 
+	if (hba->quirks & UFSHCD_QUIRK_BROKEN_OCS_FATAL_ERROR) {
+		if (be32_to_cpu(lrbp->ucd_rsp_ptr->header.dword_1) &
+					MASK_RSP_UPIU_RESULT)
+			ocs = OCS_SUCCESS;
+	}
+
 	switch (ocs) {
 	case OCS_SUCCESS:
 		result = ufshcd_get_req_rsp(lrbp->ucd_rsp_ptr);
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index a9b9ace9fc72..e1d09c2c4302 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -541,6 +541,12 @@ enum ufshcd_quirks {
 	 * resolution of the values of PRDTO and PRDTL in UTRD as byte.
 	 */
 	UFSHCD_QUIRK_PRDT_BYTE_GRAN			= 1 << 9,
+
+	/*
+	 * This quirk needs to be enabled if the host controller reports
+	 * OCS FATAL ERROR with device error through sense data
+	 */
+	UFSHCD_QUIRK_BROKEN_OCS_FATAL_ERROR		= 1 << 10,
 };
 
 enum ufshcd_caps {
-- 
2.17.1