[media] tm6000: Add fast USB access quirk

Some devices support fast access to registers using the USB interface
while others require a certain delay after each operation. This commit
adds a quirk that can be enabled by devices that don't need the delay.
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/staging/tm6000/tm6000-core.c

@@ -619,7 +619,8 @@ int tm6000_reset(struct tm6000_core *dev)
 		return err;
 	}
 
-	msleep(5);
+	if ((dev->quirks & TM6000_QUIRK_NO_USB_DELAY) == 0)
+		msleep(5);
 
 	/*
 	 * Not all devices have int_in defined

drivers/staging/tm6000/tm6000.h

@@ -169,6 +169,8 @@ struct tm6000_endpoint {
 	unsigned			maxsize;
 };
 
+#define TM6000_QUIRK_NO_USB_DELAY (1 << 0)
+
 struct tm6000_core {
 	/* generic device properties */
 	char				name[30];	/* name (including minor) of the device */
@@ -260,6 +262,8 @@ struct tm6000_core {
 	struct usb_isoc_ctl          isoc_ctl;
 
 	spinlock_t                   slock;
+
+	unsigned long quirks;
 };
 
 enum tm6000_ops_type {