usb: dwc2: host: Add scheduler tracing
In preparation for future changes to the scheduler let's add some
tracing that makes it easy for us to see what's happening. By default
this tracing will be off.
By changing "core.h" you can easily trace to ftrace, the console, or
nowhere.
Acked-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
diff --git a/drivers/usb/dwc2/hcd_queue.c b/drivers/usb/dwc2/hcd_queue.c
index bc632a7..0e9faa7 100644
--- a/drivers/usb/dwc2/hcd_queue.c
+++ b/drivers/usb/dwc2/hcd_queue.c
@@ -113,6 +113,9 @@
qh->sched_frame = dwc2_frame_num_inc(hsotg->frame_number,
SCHEDULE_SLOP);
qh->interval = urb->interval;
+ dwc2_sch_dbg(hsotg, "QH=%p init sch=%04x, fn=%04x, int=%#x\n",
+ qh, qh->sched_frame, hsotg->frame_number,
+ qh->interval);
#if 0
/* Increase interrupt polling rate for debugging */
if (qh->ep_type == USB_ENDPOINT_XFER_INT)
@@ -126,6 +129,11 @@
qh->interval *= 8;
qh->sched_frame |= 0x7;
qh->start_split_frame = qh->sched_frame;
+ dwc2_sch_dbg(hsotg,
+ "QH=%p init*8 sch=%04x, fn=%04x, int=%#x\n",
+ qh, qh->sched_frame, hsotg->frame_number,
+ qh->interval);
+
}
dev_dbg(hsotg->dev, "interval=%d\n", qh->interval);
}
@@ -482,6 +490,8 @@
if (frame >= 0) {
qh->sched_frame &= ~0x7;
qh->sched_frame |= (frame & 7);
+ dwc2_sch_dbg(hsotg, "QH=%p sched_p sch=%04x, uf=%d\n",
+ qh, qh->sched_frame, frame);
}
if (status > 0)
@@ -583,10 +593,16 @@
if (!dwc2_frame_num_le(qh->sched_frame, hsotg->frame_number) &&
!hsotg->frame_number) {
+ u16 new_frame;
+
dev_dbg(hsotg->dev,
"reset frame number counter\n");
- qh->sched_frame = dwc2_frame_num_inc(hsotg->frame_number,
+ new_frame = dwc2_frame_num_inc(hsotg->frame_number,
SCHEDULE_SLOP);
+
+ dwc2_sch_vdbg(hsotg, "QH=%p reset sch=%04x=>%04x\n",
+ qh, qh->sched_frame, new_frame);
+ qh->sched_frame = new_frame;
}
/* Add the new QH to the appropriate schedule */
@@ -652,6 +668,7 @@
int sched_next_periodic_split)
{
u16 incr;
+ u16 old_frame = qh->sched_frame;
if (sched_next_periodic_split) {
qh->sched_frame = frame_number;
@@ -677,6 +694,11 @@
qh->sched_frame |= 0x7;
qh->start_split_frame = qh->sched_frame;
}
+
+ dwc2_sch_vdbg(hsotg, "QH=%p next(%d) fn=%04x, sch=%04x=>%04x (%+d)\n",
+ qh, sched_next_periodic_split, frame_number, old_frame,
+ qh->sched_frame,
+ dwc2_frame_num_dec(qh->sched_frame, old_frame));
}
/*