Messages in this thread Patch in this message | | | Date | Fri, 29 Jul 2005 12:18:28 -0700 | From | Greg KH <> | Subject | [patch 28/29] USB: fix in usb_calc_bus_time |
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From: Dan Streetman <ddstreet@ieee.org>
This patch does the same swap, i.e. use the ISO macro if (isoc). Additionally, it fixes the return value - the usb_calc_bus_time function returns the time in nanoseconds (I didn't notice that before) while the HS_USECS and HS_USECS_ISO are microseconds. This fixes the function to return nanoseconds always, and adjusts ehci-q.c (the only high-speed caller of the function) to wrap the call in NS_TO_US().
Signed-off-by: Dan Streetman <ddstreet@ieee.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- drivers/usb/core/hcd.c | 4 ++-- drivers/usb/core/hcd.h | 8 +++++--- drivers/usb/host/ehci-q.c | 4 ++-- 3 files changed, 9 insertions(+), 7 deletions(-)
--- gregkh-2.6.orig/drivers/usb/core/hcd.c 2005-07-29 11:30:03.000000000 -0700 +++ gregkh-2.6/drivers/usb/core/hcd.c 2005-07-29 11:36:34.000000000 -0700 @@ -939,9 +939,9 @@ case USB_SPEED_HIGH: /* ISOC or INTR */ // FIXME adjust for input vs output if (isoc) - tmp = HS_USECS (bytecount); + tmp = HS_NSECS_ISO (bytecount); else - tmp = HS_USECS_ISO (bytecount); + tmp = HS_NSECS (bytecount); return tmp; default: pr_debug ("%s: bogus device speed!\n", usbcore_name); --- gregkh-2.6.orig/drivers/usb/core/hcd.h 2005-07-29 11:29:47.000000000 -0700 +++ gregkh-2.6/drivers/usb/core/hcd.h 2005-07-29 11:36:34.000000000 -0700 @@ -334,17 +334,19 @@ 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); --- gregkh-2.6.orig/drivers/usb/host/ehci-q.c 2005-07-29 11:29:47.000000000 -0700 +++ gregkh-2.6/drivers/usb/host/ehci-q.c 2005-07-29 11:36:34.000000000 -0700 @@ -657,8 +657,8 @@ * For control/bulk requests, the HC or TT handles these. */ if (type == PIPE_INTERRUPT) { - qh->usecs = usb_calc_bus_time (USB_SPEED_HIGH, is_input, 0, - hb_mult (maxp) * max_packet (maxp)); + qh->usecs = NS_TO_US (usb_calc_bus_time (USB_SPEED_HIGH, is_input, 0, + hb_mult (maxp) * max_packet (maxp))); qh->start = NO_FRAME; if (urb->dev->speed == USB_SPEED_HIGH) { -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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