[PATCH] ehci: add tt_usecs
david-b@pacbell.net [Sun, 14 Aug 2005 01:44:58 +0000 (18:44 -0700)]
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>

drivers/usb/host/ehci-q.c
drivers/usb/host/ehci-sched.c
drivers/usb/host/ehci.h

index 20df01a..940d38c 100644 (file)
@@ -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;
                }
        }
index 4c972b5..ccc7300 100644 (file)
@@ -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;
 
index a754215..20c9b55 100644 (file)
@@ -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;