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-rw-r--r--drivers/usb/host/r8a66597-hcd.c31
1 files changed, 27 insertions, 4 deletions
diff --git a/drivers/usb/host/r8a66597-hcd.c b/drivers/usb/host/r8a66597-hcd.c
index 4db0107f317..d5f02dddb12 100644
--- a/drivers/usb/host/r8a66597-hcd.c
+++ b/drivers/usb/host/r8a66597-hcd.c
@@ -863,6 +863,32 @@ static void disable_r8a66597_pipe_all(struct r8a66597 *r8a66597,
dev->dma_map = 0;
}
+static u16 get_interval(struct urb *urb, __u8 interval)
+{
+ u16 time = 1;
+ int i;
+
+ if (urb->dev->speed == USB_SPEED_HIGH) {
+ if (interval > IITV)
+ time = IITV;
+ else
+ time = interval ? interval - 1 : 0;
+ } else {
+ if (interval > 128) {
+ time = IITV;
+ } else {
+ /* calculate the nearest value for PIPEPERI */
+ for (i = 0; i < 7; i++) {
+ if ((1 << i) < interval &&
+ (1 << (i + 1) > interval))
+ time = 1 << i;
+ }
+ }
+ }
+
+ return time;
+}
+
static unsigned long get_timer_interval(struct urb *urb, __u8 interval)
{
__u8 i;
@@ -901,10 +927,7 @@ static void init_pipe_info(struct r8a66597 *r8a66597, struct urb *urb,
info.interval = 0;
info.timer_interval = 0;
} else {
- if (ep->bInterval > IITV)
- info.interval = IITV;
- else
- info.interval = ep->bInterval ? ep->bInterval - 1 : 0;
+ info.interval = get_interval(urb, ep->bInterval);
info.timer_interval = get_timer_interval(urb, ep->bInterval);
}
if (ep->bEndpointAddress & USB_ENDPOINT_DIR_MASK)