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scsi: core: Adjust DBD setting in MODE SENSE for caching mode page per LLD 

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.

Link: https://lore.kernel.org/r/0101016ed3d643f9-ffd45d6c-c593-4a13-a18f-a32da3d3bb97-000000@us-west-2.amazonses.com
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Signed-off-by: Can Guo <cang@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Can Guo 2019-12-05 02:14:25 +00:00 committed by Martin K. Petersen
parent 2df74b6985
commit 0ec9691334
2 changed files with 3 additions and 0 deletions
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2
drivers/scsi/scsi_lib.c
View File

@ -2108,6 +2108,8 @@ scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
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;

1
include/scsi/scsi_device.h
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@ -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) */