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4670e537169b2ed4befa375cbd9c13a2bd8c39c7
Previously an error in master-slave communication often leaves the chips in bad states and thus prevents further operation. Improve this by: - Making master_slave_sync() state-less. - Restoring SPI_NSS and disabling DMA on error. BUG=None TEST=Inject errors on master side and slave side. Check the subsequent operations succeed. BRANCH=None Change-Id: Ief8b5b0df3d4be6319957bb1f9daf93e0e9b5d92 Signed-off-by: Vic Yang <victoryang@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/203337 Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit
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