[PATCH 2/3] usb: storage: add support write cache quirk on usb hdd

[Namjae Jeon <linkinjeon@gmail.com>]

Add support write cache quirk on usb hdd. scsi driver will be set to wce by detecting write cache quirk in quirk list when plugging usb hdd.

Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Pankaj Kumar <pankaj.km@samsung.com>
Signed-off-by: Amit Sahrawat <a.sahrawat@samsung.com>
---
 drivers/usb/storage/scsiglue.c |    6 ++++++
 drivers/usb/storage/usb.c      |    5 ++++-
 include/linux/usb/quirks.h     |    3 +++
 include/linux/usb_usual.h      |    4 +++-
 4 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/storage/scsiglue.c b/drivers/usb/storage/scsiglue.c
index a324a5d..f7d0ea5 100644
--- a/drivers/usb/storage/scsiglue.c
+++ b/drivers/usb/storage/scsiglue.c
@@ -51,6 +51,7 @@
 #include <scsi/scsi_devinfo.h>
 #include <scsi/scsi_device.h>
 #include <scsi/scsi_eh.h>
+#include <linux/usb/quirks.h>
 
 #include "usb.h"
 #include "scsiglue.h"
@@ -230,6 +231,11 @@ static int slave_configure(struct scsi_device *sdev)
 					US_FL_SCM_MULT_TARG)) &&
 				us->protocol == USB_PR_BULK)
 			us->use_last_sector_hacks = 1;
+
+		/* Check for the cache quirk present or not */
+		if (us->pusb_dev->quirks & USB_QUIRK_WRITE_CACHE ||
+				us->fflags & US_FL_WRITE_CACHE)
+				sdev->wce_quirk = 1;
 	} else {
 
 		/* Non-disk-type devices don't need to blacklist any pages
diff --git a/drivers/usb/storage/usb.c b/drivers/usb/storage/usb.c
index e23c30a..062d7d5 100644
--- a/drivers/usb/storage/usb.c
+++ b/drivers/usb/storage/usb.c
@@ -473,7 +473,7 @@ static void adjust_quirks(struct us_data *us)
 			US_FL_CAPACITY_OK | US_FL_IGNORE_RESIDUE |
 			US_FL_SINGLE_LUN | US_FL_NO_WP_DETECT |
 			US_FL_NO_READ_DISC_INFO | US_FL_NO_READ_CAPACITY_16 |
-			US_FL_INITIAL_READ10);
+			US_FL_INITIAL_READ10 | US_FL_WRITE_CACHE);
 
 	p = quirks;
 	while (*p) {
@@ -538,6 +538,9 @@ static void adjust_quirks(struct us_data *us)
 		case 'w':
 			f |= US_FL_NO_WP_DETECT;
 			break;
+		case 'p':
+			f |= US_FL_WRITE_CACHE;
+			break;
 		/* Ignore unrecognized flag characters */
 		}
 	}
diff --git a/include/linux/usb/quirks.h b/include/linux/usb/quirks.h
index 3e93de7..9a3c8ab 100644
--- a/include/linux/usb/quirks.h
+++ b/include/linux/usb/quirks.h
@@ -30,4 +30,7 @@
    descriptor */
 #define USB_QUIRK_DELAY_INIT		0x00000040
 
+/* Device can't handle cache status request */
+#define USB_QUIRK_WRITE_CACHE		0x00000080
+
 #endif /* __LINUX_USB_QUIRKS_H */
diff --git a/include/linux/usb_usual.h b/include/linux/usb_usual.h
index 17df360..f8fdcbf 100644
--- a/include/linux/usb_usual.h
+++ b/include/linux/usb_usual.h
@@ -64,7 +64,9 @@
 	US_FLAG(NO_READ_CAPACITY_16,	0x00080000)		\
 		/* cannot handle READ_CAPACITY_16 */		\
 	US_FLAG(INITIAL_READ10,	0x00100000)			\
-		/* Initial READ(10) (and others) must be retried */
+		/* Initial READ(10) (and others) must be retried */	\
+	US_FLAG(WRITE_CACHE, 0x00200000)		\
+	/* Cache read status is not correct */
 
 #define US_FLAG(name, value)	US_FL_##name = value ,
 enum { US_DO_ALL_FLAGS };
-- 
1.7.9.5