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From:   Can Guo <cang@codeaurora.org>
To:     asutoshd@codeaurora.org, nguyenb@codeaurora.org,
        rnayak@codeaurora.org, linux-scsi@vger.kernel.org,
        kernel-team@android.com, saravanak@google.com, salyzyn@google.com,
        cang@codeaurora.org
Cc:     "James E.J. Bottomley" <jejb@linux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@oracle.com>,
        linux-kernel@vger.kernel.org (open list)
Subject: [PATCH v4 1/5] scsi: Adjust DBD setting in mode sense for caching mode page per LLD
Date:   Tue, 12 Nov 2019 22:00:19 -0800
Message-Id: <1573624824-671-2-git-send-email-cang@codeaurora.org>
In-Reply-To: <1573624824-671-1-git-send-email-cang@codeaurora.org>
References: <1573624824-671-1-git-send-email-cang@codeaurora.org>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

UFS JEDEC standards require DBD field to be set to 1 in mode sense command.
This patch allows LLD to define the setting of DBD if required.

Signed-off-by: Can Guo <cang@codeaurora.org>
---
 drivers/scsi/scsi_lib.c    | 2 ++
 include/scsi/scsi_device.h | 1 +
 2 files changed, 3 insertions(+)

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 5447738..3812e90 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -2108,6 +2108,8 @@ void scsi_exit_queue(void)
 
 	memset(data, 0, sizeof(*data));
 	memset(&cmd[0], 0, 12);
+
+	dbd = sdev->set_dbd_for_ms ? 8 : dbd;
 	cmd[1] = dbd & 0x18;	/* allows DBD and LLBA bits */
 	cmd[2] = modepage;
 
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index 3ed836d..f8312a3 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -172,6 +172,7 @@ struct scsi_device {
 				     * because we did a bus reset. */
 	unsigned use_10_for_rw:1; /* first try 10-byte read / write */
 	unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
+	unsigned set_dbd_for_ms:1; /* Set "DBD" field in mode sense */
 	unsigned no_report_opcodes:1;	/* no REPORT SUPPORTED OPERATION CODES */
 	unsigned no_write_same:1;	/* no WRITE SAME command */
 	unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */
-- 
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