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For "in" transactions, the "Total Bytes to Transfer" field in
the siTD is decremented by the controller by the actual transfer
size, so what remains in the field is the residue number of bytes.
Also, handle restart when we get a zero byte read on a isochronous
"in" endpoint in devusb itself (removing the restart code for
xhci drivers).
This fixes audio recording with a usb1.1 audio device connected
to ehci controller.
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The sample frequency is an artificial parameter used for
isochronous out transfers to better match the target
frequency (usually, a sound card).
when hz is set, devusb adjusts the endpoint's maxpkt to get
the requested frequency and a multiple of the samplesize per
packet.
however, when hz is not set, then we should calculate the
frequency from maxpkt, ntds and pollival, so all parameters
will be consistent with each other.
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implementations)
The ISAConf.port might still be 32-bit on some archs.
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devdir internally replicates the qid in ther perm stat field
already and the practice of explicitely passing just causing
confusion when done inconsistently.
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usbload() calculation
with xhci, bandwidth allocations are handled by the controller
and there are various speed settings possible that currently
not exposed in the Udev. so just keep usbload() as it is for
usb2 and keep ep->load as zero for superspeed.
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moved devusb to port, shifting the responsibility of how
to enable interrupts to the arch specific hci driver.
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