diff options
| author |   david-b@pacbell.net <david-b@pacbell.net> | 2005-08-11 19:37:01 -0700 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@suse.de> | 2005-09-08 16:28:25 -0700 |
| commit | f956e7cd9ac4618b98022020e638bbdc01d9d65a (patch) | |
| tree | d727c96bda9882323bf84b56d2dd09c9fb5e39b0 /drivers/usb/core | |
| parent | [PATCH] USB: Support unbinding of the usb_generic driver (diff) | |
| download | linux-dev-f956e7cd9ac4618b98022020e638bbdc01d9d65a.tar.xz linux-dev-f956e7cd9ac4618b98022020e638bbdc01d9d65a.zip | |
[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/usb/core')
| -rw-r--r-- | drivers/usb/core/hcd.h | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/usb/core/hcd.h b/drivers/usb/core/hcd.h index 28055f95645b..ac451fa7e4d2 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)) |