USB: EHCI: create a "periodic schedule info" struct
This patch begins the process of unifying the scheduling parameters
that ehci-hcd uses for interrupt and isochronous transfers. It
creates an ehci_per_sched structure, which will be stored in both
ehci_qh and ehci_iso_stream structures, and will contain the common
scheduling information needed for both.
Initially we merely create the new structure and move some existing
fields into it. Later patches will add more fields and utilize these
structures in improved scheduling algorithms.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/host/ehci-q.c b/drivers/usb/host/ehci-q.c
index e321804..9bfaa21 100644
--- a/drivers/usb/host/ehci-q.c
+++ b/drivers/usb/host/ehci-q.c
@@ -105,9 +105,9 @@
is_out = qh->is_out;
epnum = (hc32_to_cpup(ehci, &hw->hw_info1) >> 8) & 0x0f;
- if (unlikely (!usb_gettoggle (qh->dev, epnum, is_out))) {
+ if (unlikely(!usb_gettoggle(qh->ps.udev, epnum, is_out))) {
hw->hw_token &= ~cpu_to_hc32(ehci, QTD_TOGGLE);
- usb_settoggle (qh->dev, epnum, is_out, 1);
+ usb_settoggle(qh->ps.udev, epnum, is_out, 1);
}
}
@@ -797,26 +797,25 @@
* For control/bulk requests, the HC or TT handles these.
*/
if (type == PIPE_INTERRUPT) {
- qh->usecs = NS_TO_US(usb_calc_bus_time(USB_SPEED_HIGH,
+ qh->ps.usecs = NS_TO_US(usb_calc_bus_time(USB_SPEED_HIGH,
is_input, 0,
hb_mult(maxp) * max_packet(maxp)));
- qh->start = NO_FRAME;
+ qh->ps.phase = NO_FRAME;
if (urb->dev->speed == USB_SPEED_HIGH) {
- qh->c_usecs = 0;
+ qh->ps.c_usecs = 0;
qh->gap_uf = 0;
- qh->period = urb->interval >> 3;
- if (qh->period == 0 && urb->interval != 1) {
+ if (urb->interval > 1 && urb->interval < 8) {
/* NOTE interval 2 or 4 uframes could work.
* But interval 1 scheduling is simpler, and
* includes high bandwidth.
*/
urb->interval = 1;
- } else if (qh->period > ehci->periodic_size) {
- qh->period = ehci->periodic_size;
- urb->interval = qh->period << 3;
+ } else if (urb->interval > ehci->periodic_size << 3) {
+ urb->interval = ehci->periodic_size << 3;
}
+ qh->ps.period = urb->interval >> 3;
} else {
int think_time;
@@ -826,27 +825,26 @@
/* FIXME this just approximates SPLIT/CSPLIT times */
if (is_input) { // SPLIT, gap, CSPLIT+DATA
- qh->c_usecs = qh->usecs + HS_USECS (0);
- qh->usecs = HS_USECS (1);
+ qh->ps.c_usecs = qh->ps.usecs + HS_USECS(0);
+ qh->ps.usecs = HS_USECS(1);
} else { // SPLIT+DATA, gap, CSPLIT
- qh->usecs += HS_USECS (1);
- qh->c_usecs = HS_USECS (0);
+ qh->ps.usecs += HS_USECS(1);
+ qh->ps.c_usecs = HS_USECS(0);
}
think_time = tt ? tt->think_time : 0;
- qh->tt_usecs = NS_TO_US (think_time +
+ qh->ps.tt_usecs = NS_TO_US(think_time +
usb_calc_bus_time (urb->dev->speed,
is_input, 0, max_packet (maxp)));
- qh->period = urb->interval;
- if (qh->period > ehci->periodic_size) {
- qh->period = ehci->periodic_size;
- urb->interval = qh->period;
- }
+ if (urb->interval > ehci->periodic_size)
+ urb->interval = ehci->periodic_size;
+ qh->ps.period = urb->interval;
}
}
/* support for tt scheduling, and access to toggles */
- qh->dev = urb->dev;
+ qh->ps.udev = urb->dev;
+ qh->ps.ep = urb->ep;
/* using TT? */
switch (urb->dev->speed) {