Chun-Ta Lin d5c08763e1 usb_i2c: extend the protocol to support larger payload ...

The default USB packet has a maximum size of 64 bytes, however, we need
to support some USB over I2C write transaction that exceed this default.

To support so with protocol backwards-compatible in mind, we enable a
config option CONFIG_USB_I2C_MAX_WRITE_COUNT that will enlarge the USB
RX queue.

BRANCH=none
BUG=b:35587174
TEST=Complete presubmit test.
TEST=Manually update elan trackpad firmware with interrupt disabled.

Change-Id: Ia8983b036b7297f7ca673459ae34b7e5ecd2ee01
Reviewed-on: https://chromium-review.googlesource.com/513642
Commit-Ready: Chun-ta Lin <itspeter@chromium.org>
Tested-by: Chun-ta Lin <itspeter@chromium.org>
Reviewed-by: Chun-ta Lin <itspeter@chromium.org>
Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>

2017-06-05 07:55:32 -07:00

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