[PATCH] ehci: add tt_usecs

This adds the field tt_usecs to ehci_qh and ehci_iso_stream, and sets it
appropriately when setting them up as periodic endpoints.  It records
the transation translator's think_time (added in last patch) plus the
downstream (i.e. low or full speed) bustime of the transfer associated
with each interrupt or iso frame, as calculated by usb_calc_bus_time.

Signed-off-by: Dan Streetman <ddstreet@ieee.org>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

3 files changed, 13 insertions, 0 deletions

diff --git a/drivers/usb/host/ehci-q.c b/drivers/usb/host/ehci-q.c
index 20df01a..940d38c 100644
--- a/drivers/usb/host/ehci-q.c
+++ b/drivers/usb/host/ehci-q.c
@@ -677,6 +677,9 @@ qh_make (
 				goto done;
 			}
 		} else {
+			struct usb_tt	*tt = urb->dev->tt;
+			int		think_time;
+
 			/* gap is f(FS/LS transfer times) */
 			qh->gap_uf = 1 + usb_calc_bus_time (urb->dev->speed,
 					is_input, 0, maxp) / (125 * 1000);
@@ -690,6 +693,10 @@ qh_make (
 				qh->c_usecs = HS_USECS (0);
 			}
 
+			think_time = tt ? tt->think_time : 0;
+			qh->tt_usecs = NS_TO_US (think_time +
+					usb_calc_bus_time (urb->dev->speed,
+					is_input, 0, max_packet (maxp)));
 			qh->period = urb->interval;
 		}
 	}
diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c
index 4c972b5..ccc7300 100644
--- a/drivers/usb/host/ehci-sched.c
+++ b/drivers/usb/host/ehci-sched.c
@@ -700,6 +700,7 @@ iso_stream_init (
 
 	} else {
 		u32		addr;
+		int		think_time;
 
 		addr = dev->ttport << 24;
 		if (!ehci_is_TDI(ehci)
@@ -709,6 +710,9 @@ iso_stream_init (
 		addr |= epnum << 8;
 		addr |= dev->devnum;
 		stream->usecs = HS_USECS_ISO (maxp);
+		think_time = dev->tt ? dev->tt->think_time : 0;
+		stream->tt_usecs = NS_TO_US (think_time + usb_calc_bus_time (
+				dev->speed, is_input, 1, maxp));
 		if (is_input) {
 			u32	tmp;
 
diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h
index a754215..20c9b55 100644
--- a/drivers/usb/host/ehci.h
+++ b/drivers/usb/host/ehci.h
@@ -421,6 +421,7 @@ struct ehci_qh {
 	u8			usecs;		/* intr bandwidth */
 	u8			gap_uf;		/* uframes split/csplit gap */
 	u8			c_usecs;	/* ... split completion bw */
+	u16			tt_usecs;	/* tt downstream bandwidth */
 	unsigned short		period;		/* polling interval */
 	unsigned short		start;		/* where polling starts */
 #define NO_FRAME ((unsigned short)~0)			/* pick new start */
@@ -479,6 +480,7 @@ struct ehci_iso_stream {
 	 */
 	u8			interval;
 	u8			usecs, c_usecs;
+	u16			tt_usecs;
 	u16			maxp;
 	u16			raw_mask;
 	unsigned		bandwidth;