tegra124: Add Rx frame header support to SPI code
This adds support for finding a frame header in the input stream.
If a frame header is enabled, then the input buffer is scanned after
each iteration of the outer loop. If the header is found, the bytes
are shifted to the beginning of the buffer and the counter is
decremented so that if necessary another iteration can take place
with the remaining byte count.
This allows us to always transfer the maximum number of bytes.
BUG=none
BRANCH=none
TEST=tested on nyan, querying EC actually works now
Signed-off-by: David Hendricks <dhendrix@chromium.org>
Change-Id: I5827b386fc372ee6768403f5a8bb86f7c680e523
Reviewed-on: https://chromium-review.googlesource.com/174711
Reviewed-by: David Hendricks <dhendrix@chromium.org>
Commit-Queue: David Hendricks <dhendrix@chromium.org>
Tested-by: David Hendricks <dhendrix@chromium.org>
1 file changed
