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ANDROID: GKI: scsi: Adjust DBD setting in mode sense for caching mode page per LLD

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Host sends MODE_SENSE_10 with caching mode page, to check if the device
supports the cache feature.
Some LLD standards requires DBD field to be set to 1.

This patch allows LLD to define the setting of DBD if required.

Change-Id: I7f6c0ff6613516c3ef49aacc0679b96b8bd9ccc8
Signed-off-by: Maya Erez <merez@codeaurora.org>
[mattw@codeaurora.org: resolved a trivial context conflict in
Scsi_Host struct definition]
Signed-off-by: Matt Wagantall <mattw@codeaurora.org>
[subhashj@codeaurora.org: resolved trivial merge conflicts]
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
Bug: 153569404
(cherry picked from commit 36c183b7430f9170497c4467e60a70d07fce239c)
Signed-off-by: Saravana Kannan <saravanak@google.com>
This commit is contained in:
Maya Erez 2014-11-13 12:55:04 +02:00 • committed by Saravana Kannan
parent 15207c2985
commit 0aab3881ce
2 changed files with 11 additions and 1 deletions
drivers/scsi
sd.c
include/scsi
scsi_host.h

6
drivers/scsi/sd.c
View file

@ -2680,6 +2680,7 @@ sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
{
int len = 0, res;
struct scsi_device *sdp = sdkp->device;
struct Scsi_Host *host = sdp->host;
int dbd;
int modepage;
@ -2711,7 +2712,10 @@ sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
dbd = 8;
} else {
modepage = 8;
dbd = 0;
if (host->set_dbd_for_caching)
dbd = 8;
else
dbd = 0;
}
/* cautiously ask */

6
include/scsi/scsi_host.h
View file

@ -657,6 +657,12 @@ struct Scsi_Host {
/* Host responded with short (<36 bytes) INQUIRY result */
unsigned short_inquiry:1;
/*
* Set "DBD" field in mode_sense caching mode page in case it is
* mandatory by LLD standard.
*/
unsigned set_dbd_for_caching:1;
/*
* Optional work queue to be utilized by the transport
*/