usb: r8a66597-hcd: fix iinterval for Full/Low speed device

fix interrupt transfer interval for Full/Low speed device.

Signed-off-by: Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 27 insertions, 4 deletions

diff --git a/drivers/usb/host/r8a66597-hcd.c b/drivers/usb/host/r8a66597-hcd.c
index 4db0107f3178..d5f02dddb120 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)