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The default receive FIFO threshold of 8 (meaning that 9 bytes need to be received before receive IRQ fires) is good for high volume transfers, when the amount of transferred data greatly exceeds the threshold. But in case of TPM transactions, which start with a 4 byte header and then stall while the device processes it, the default threshold guarantees delays on every transaction, as the receiver does not start processing the header until 5 idle bytes are transferred to bring the total number to nine. The suggested solution is to allow to specify the receive FIFO interrupt request threshold at run time, by adding this value to the receive function registration API. BRANCH=none BUG=chrome-os-partner:43025 TEST=verified that spstest still works fine. Change-Id: I92517205a7d0d47893b702efa188eb524fb18a49 Signed-off-by: Vadim Bendebury <vbendeb@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/289331 Reviewed-by: Bill Richardson <wfrichar@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit