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Subject[PATCH v6 1/5] scsi: Adjust DBD setting in mode sense for caching mode page per LLD
Date
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) */
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
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