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ehci: rework frame skipping

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Move the framecount check out of the loop and use the new
ehci_update_frindex function to skip frames if needed.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2012-05-25 08:13:55 +02:00
parent 3a21532626
commit f020ed36fe
1 changed files with 10 additions and 15 deletions
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25
hw/usb/hcd-ehci.c
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@ -2315,9 +2315,8 @@ static void ehci_frame_timer(void *opaque)
int schedules = 0;
int64_t expire_time, t_now;
uint64_t ns_elapsed;
int frames;
int frames, skipped_frames;
int i;
int skipped_frames = 0;
t_now = qemu_get_clock_ns(vm_clock);
ns_elapsed = t_now - ehci->last_run_ns;
@ -2327,15 +2326,17 @@ static void ehci_frame_timer(void *opaque)
schedules++;
expire_time = t_now + (get_ticks_per_sec() / FRAME_TIMER_FREQ);
for (i = 0; i < frames; i++) {
ehci_update_frindex(ehci, 1);
if (frames - i > ehci->maxframes) {
skipped_frames++;
} else {
ehci_advance_periodic_state(ehci);
if (frames > ehci->maxframes) {
skipped_frames = frames - ehci->maxframes;
ehci_update_frindex(ehci, skipped_frames);
ehci->last_run_ns += FRAME_TIMER_NS * skipped_frames;
frames -= skipped_frames;
DPRINTF("WARNING - EHCI skipped %d frames\n", skipped_frames);
}
for (i = 0; i < frames; i++) {
ehci_update_frindex(ehci, 1);
ehci_advance_periodic_state(ehci);
ehci->last_run_ns += FRAME_TIMER_NS;
}
} else {
@ -2348,12 +2349,6 @@ static void ehci_frame_timer(void *opaque)
ehci->last_run_ns += FRAME_TIMER_NS * frames;
}
#if 0
if (skipped_frames) {
DPRINTF("WARNING - EHCI skipped %d frames\n", skipped_frames);
}
#endif
/* Async is not inside loop since it executes everything it can once
* called
*/