USB: change bInterval default to 10 ms

[pandora-kernel.git] / drivers / usb / core / config.c

diff --git a/drivers/usb/core/config.c b/drivers/usb/core/config.c
index 37debdf..5a28a14 100644 (file)
--- a/drivers/usb/core/config.c
+++ b/drivers/usb/core/config.c
@@ -213,8 +213,10 @@ static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum,
        memcpy(&endpoint->desc, d, n);
        INIT_LIST_HEAD(&endpoint->urb_list);
 
-       /* Fix up bInterval values outside the legal range. Use 32 ms if no
-        * proper value can be guessed. */
+       /*
+        * Fix up bInterval values outside the legal range.
+        * Use 10 or 8 ms if no proper value can be guessed.
+        */
        i = 0;          /* i = min, j = max, n = default */
        j = 255;
        if (usb_endpoint_xfer_int(d)) {
@@ -222,13 +224,15 @@ static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum,
                switch (to_usb_device(ddev)->speed) {
                case USB_SPEED_SUPER:
                case USB_SPEED_HIGH:
-                       /* Many device manufacturers are using full-speed
+                       /*
+                        * Many device manufacturers are using full-speed
                         * bInterval values in high-speed interrupt endpoint
-                        * descriptors. Try to fix those and fall back to a
-                        * 32 ms default value otherwise. */
+                        * descriptors. Try to fix those and fall back to an
+                        * 8-ms default value otherwise.
+                        */
                        n = fls(d->bInterval*8);
                        if (n == 0)
-                               n = 9;  /* 32 ms = 2^(9-1) uframes */
+                               n = 7;  /* 8 ms = 2^(7-1) uframes */
                        j = 16;
 
                        /*
@@ -243,10 +247,12 @@ static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum,
                        }
                        break;
                default:                /* USB_SPEED_FULL or _LOW */
-                       /* For low-speed, 10 ms is the official minimum.
+                       /*
+                        * For low-speed, 10 ms is the official minimum.
                         * But some "overclocked" devices might want faster
-                        * polling so we'll allow it. */
-                       n = 32;
+                        * polling so we'll allow it.
+                        */
+                       n = 10;
                        break;
                }
        } else if (usb_endpoint_xfer_isoc(d)) {
@@ -254,10 +260,10 @@ static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum,
                j = 16;
                switch (to_usb_device(ddev)->speed) {
                case USB_SPEED_HIGH:
-                       n = 9;          /* 32 ms = 2^(9-1) uframes */
+                       n = 7;          /* 8 ms = 2^(7-1) uframes */
                        break;
                default:                /* USB_SPEED_FULL */
-                       n = 6;          /* 32 ms = 2^(6-1) frames */
+                       n = 4;          /* 8 ms = 2^(4-1) frames */
                        break;
                }
        }