[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>

2 files changed, 6 insertions, 1 deletions

diff --git a/drivers/staging/tm6000/tm6000-core.c b/drivers/staging/tm6000/tm6000-core.c
index b3c4e0529f4f..6d0803c886be 100644
--- a/drivers/staging/tm6000/tm6000-core.c
+++ b/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
diff --git a/drivers/staging/tm6000/tm6000.h b/drivers/staging/tm6000/tm6000.h
index dac20637c696..5bdce84f8d60 100644
--- a/drivers/staging/tm6000/tm6000.h
+++ b/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 {