linux-kernel - [PATCH 5.7 097/124] scsi: ufs: Add quirk to fix abnormal ocs fatal error

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Message-Id: <20200824082414.194098752@linuxfoundation.org>
Date:   Mon, 24 Aug 2020 10:30:31 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Avri Altman <avri.altman@....com>,
        Kiwoong Kim <kwmad.kim@...sung.com>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.7 097/124] scsi: ufs: Add quirk to fix abnormal ocs fatal error

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

[ Upstream commit d779a6e90e189f4883ce6f900da02995fb000df5 ]

Some controller like Exynos determines if FATAL ERROR (0x7) in OCS field in
UTRD occurs for values other than GOOD (0x0) in STATUS field in response
upiu as well as errors that a host controller can't cover.  This patch is
to prevent from reporting command results in those cases.

Link: https://lore.kernel.org/r/20200528011658.71590-6-alim.akhtar@samsung.com
Reviewed-by: Avri Altman <avri.altman@....com>
Signed-off-by: Kiwoong Kim <kwmad.kim@...sung.com>
Signed-off-by: Alim Akhtar <alim.akhtar@...sung.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 4d5e8f6a31438..7298adbcdec85 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -4799,6 +4799,12 @@ 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 b3b2d09d8fff3..59ca93b64bb08 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 {
-- 
2.25.1