USB: change bInterval default to 10 ms

AlanStern · gregkh · commit 08c5cd37480f · 2016-09-16T16:29:41.000+02:00
Some full-speed mceusb infrared transceivers contain invalid endpoint
descriptors for their interrupt endpoints, with bInterval set to 0.
In the past they have worked out okay with the mceusb driver, because
the driver sets the bInterval field in the descriptor to 1,
overwriting whatever value may have been there before.  However, this
approach was never sanctioned by the USB core, and in fact it does not
work with xHCI controllers, because they use the bInterval value that
was present when the configuration was installed.

Currently usbcore uses 32 ms as the default interval if the value in
the endpoint descriptor is invalid.  It turns out that these IR
transceivers don't work properly unless the interval is set to 10 ms
or below.  To work around this mceusb problem, this patch changes the
endpoint-descriptor parsing routine, making the default interval value
be 10 ms rather than 32 ms.

Signed-off-by: Alan Stern &lt;stern@rowland.harvard.edu&gt;
Tested-by: Wade Berrier &lt;wberrier@gmail.com&gt;
CC: &lt;stable@vger.kernel.org&gt;
Signed-off-by: Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt;
diff --git a/drivers/usb/core/config.c b/drivers/usb/core/config.c
@@ -240,8 +240,10 @@ 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)) {
@@ -250,13 +252,15 @@ static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum,
 		case USB_SPEED_SUPER_PLUS:
 		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;
 
 			/*
@@ -271,21 +275,23 @@ 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)) {
 		i = 1;
 		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;
 		}
 	}
