usb: gadget: storage: Increase FSG_BUFLEN

Increase the buffer length to be just above maximum permissible value
of 128 kiB . This increases the performance of the UMS and alike by a
factor of 2 - 2.5 as the buffers are less fragmented.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Lukasz Majewski <lukma@denx.de>

drivers/usb/gadget/storage_common.c

@@ -309,7 +309,7 @@ static struct fsg_lun *fsg_lun_from_dev(struct device *dev)
 #define FSG_NUM_BUFFERS	2
 
 /* Default size of buffer length. */
-#define FSG_BUFLEN	((u32)16384)
+#define FSG_BUFLEN	((u32)131072)
 
 /* Maximal number of LUNs supported in mass storage function */
 #define FSG_MAX_LUNS	8