From: Jean-François Moine <moinejf@free.fr>
Date: Wed, 10 Aug 2011 10:28:44 +0000 (-0300)
Subject: [media] gspca - main: Fix the isochronous transfer interval
X-Git-Tag: v3.2-rc1~112^2~177
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=480992b357d153b8417ba242fc43e96d90cff94c;p=platform%2Fkernel%2Flinux-3.10.git

[media] gspca - main: Fix the isochronous transfer interval

For USB speeds different of 'low', the bInterval value is logarithmic.

Signed-off-by: Jean-François Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
---

diff --git a/drivers/media/video/gspca/gspca.c b/drivers/media/video/gspca/gspca.c
index a3c2d36..85d2469 100644
--- a/drivers/media/video/gspca/gspca.c
+++ b/drivers/media/video/gspca/gspca.c
@@ -754,7 +754,10 @@ static int create_urbs(struct gspca_dev *gspca_dev,
 						    ep->desc.bEndpointAddress);
 			urb->transfer_flags = URB_ISO_ASAP
 					| URB_NO_TRANSFER_DMA_MAP;
-			urb->interval = ep->desc.bInterval;
+			if (gspca_dev->dev->speed == USB_SPEED_LOW)
+				urb->interval = ep->desc.bInterval;
+			else
+				urb->interval = 1 << (ep->desc.bInterval - 1);
 			urb->complete = isoc_irq;
 			urb->number_of_packets = npkt;
 			for (i = 0; i < npkt; i++) {