If we don't know what are the actual U1/U2 exit
latencies from the UDC, we're better off using
maximum latencies as default. This should avoid
any problems with too frequent U1/U2 entry.
Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
---
include/linux/usb/gadget.h | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
index 3667d667cab1..20cb590c658e 100644
--- a/include/linux/usb/gadget.h
+++ b/include/linux/usb/gadget.h
@@ -276,11 +276,19 @@ static inline void usb_ep_fifo_flush(struct usb_ep *ep)
/*-------------------------------------------------------------------------*/
+/**
+ * struct usb_dcd_config_params - Default U1/U2 exit latencies
+ * @bU1DevExitLat: U1 Exit Latency in us
+ * @bU2DevExitLat: U2 Exit Latency in us
+ *
+ * Note that we will be setting U1/U2 exit latencies to their maximum
+ * by default if no value is passed by the UDC Driver.
+ */
struct usb_dcd_config_params {
__u8 bU1DevExitLat; /* U1 Device exit Latency */
-#define USB_DEFAULT_U1_DEV_EXIT_LAT 0x01 /* Less then 1 microsec */
+#define USB_DEFAULT_U1_DEV_EXIT_LAT 10 /* us */
__le16 wU2DevExitLat; /* U2 Device exit Latency */
-#define USB_DEFAULT_U2_DEV_EXIT_LAT 0x1F4 /* Less then 500 microsec */
+#define USB_DEFAULT_U2_DEV_EXIT_LAT 2047 /* us */
};
--
2.9.1
--
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