tree d4a5ba87f7bc323f291af40132c8ac645922ea0a
parent 5bcf1d73b2e0a32e4ed611f40080371ef6a26717
author Brian Bosak <bbosak@google.com> 1558130627 +0000
committer CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org> 1558130627 +0000

[zircon] Fix XHCI, PHY tuning, and CDC Ethernet issues

This patch fixes various XHCI issues that caused problems
with CDC-Ethernet on certain boards with high-latency interrupts.

The following changes have been made in this patch:

* Add a direct mode for USB URBs to bypass re-assembly
and buffering throughout the pipeline and take the
most "direct" path from an interrupt handler to driver code.

* Enable direct mode for CDC Ethernet TX and RX paths.
* Increase the buffer size used for CDC Ethernet.
* Implement multi-page TRB support in XHCI.
* Increase the size of the transfer and event ring buffers.
* Revert workaround in pack-images.py

CONN-50
ZX-3957

Test: Validate no software-related packet loss in XHCI and
CDC Ethernet drivers on affected boards. Ran additional tests described
in CONN-50.

Change-Id: Ice7429ee63109db67b254488d7127a8bd95394ab