diff options
Diffstat (limited to 'drivers/usb/core/hcd.h')
| -rw-r--r-- | drivers/usb/core/hcd.h | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/usb/core/hcd.h b/drivers/usb/core/hcd.h index 67db4a999b9..28055f95645 100644 --- a/drivers/usb/core/hcd.h +++ b/drivers/usb/core/hcd.h @@ -334,17 +334,19 @@ extern void usb_release_bandwidth (struct usb_device *dev, struct urb *urb, extern int usb_check_bandwidth (struct usb_device *dev, struct urb *urb); /* - * Ceiling microseconds (typical) for that many bytes at high speed + * Ceiling [nano/micro]seconds (typical) for that many bytes at high speed * ISO is a bit less, no ACK ... from USB 2.0 spec, 5.11.3 (and needed * to preallocate bandwidth) */ #define USB2_HOST_DELAY 5 /* nsec, guess */ -#define HS_USECS(bytes) NS_TO_US ( ((55 * 8 * 2083)/1000) \ +#define HS_NSECS(bytes) ( ((55 * 8 * 2083)/1000) \ + ((2083UL * (3167 + BitTime (bytes)))/1000) \ + USB2_HOST_DELAY) -#define HS_USECS_ISO(bytes) NS_TO_US ( ((38 * 8 * 2083)/1000) \ +#define HS_NSECS_ISO(bytes) ( ((38 * 8 * 2083)/1000) \ + ((2083UL * (3167 + 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)) extern long usb_calc_bus_time (int speed, int is_input, int isoc, int bytecount); |