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authordavid-b@pacbell.net <david-b@pacbell.net>2005-08-11 19:37:01 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2005-09-08 16:28:25 -0700
commitf956e7cd9ac4618b98022020e638bbdc01d9d65a (patch)
treed727c96bda9882323bf84b56d2dd09c9fb5e39b0 /drivers
parent3b4d7f79164853e10342d707e32307e0c8054982 (diff)
[PATCH] USB: tweak highspeed timing calculations
Use a more correct calculation for highspeed bit times. http://bugzilla.kernel.org/show_bug.cgi?id=3604 This sort if thing might start to make a difference now that the high speed periodic scheduler is more complete -- and even getting used. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/usb/core/hcd.h8
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/usb/core/hcd.h b/drivers/usb/core/hcd.h
index 28055f95645..ac451fa7e4d 100644
--- a/drivers/usb/core/hcd.h
+++ b/drivers/usb/core/hcd.h
@@ -339,11 +339,11 @@ extern int usb_check_bandwidth (struct usb_device *dev, struct urb *urb);
* to preallocate bandwidth)
*/
#define USB2_HOST_DELAY 5 /* nsec, guess */
-#define HS_NSECS(bytes) ( ((55 * 8 * 2083)/1000) \
- + ((2083UL * (3167 + BitTime (bytes)))/1000) \
+#define HS_NSECS(bytes) ( ((55 * 8 * 2083) \
+ + (2083UL * (3 + BitTime(bytes))))/1000 \
+ USB2_HOST_DELAY)
-#define HS_NSECS_ISO(bytes) ( ((38 * 8 * 2083)/1000) \
- + ((2083UL * (3167 + BitTime (bytes)))/1000) \
+#define HS_NSECS_ISO(bytes) ( ((38 * 8 * 2083) \
+ + (2083UL * (3 + BitTime(bytes))))/1000 \
+ USB2_HOST_DELAY)
#define HS_USECS(bytes) NS_TO_US (HS_NSECS(bytes))
#define HS_USECS_ISO(bytes) NS_TO_US (HS_NSECS_ISO(bytes))