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Enable the SHI interrupt only after we have received and begun processing our host command. Disable the SHI interrupt once our transaction is complete (with either success or error status). This will prevent the SHI interrupt from being asserted at the same time as the CS interrupt, which can lead to the SHI interrupt being serviced first. Also, it avoids needless, non-useful SHI interrupts during error transactions. BUG=chrome-os-partner:55710,chrome-os-partner:55795 BRANCH=None TEST=Manual on gru. Stress test flashrom w/ unpowered Donette attached (for host command spam), verify no errors encountered after 100 minutes. Change-Id: I0ab20b0202ebcfe15c04b272ec67001a6a358dad Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/364698 Commit-Ready: Shawn N <shawnn@chromium.org> Tested-by: Shawn N <shawnn@chromium.org> Reviewed-by: Randall Spangler <rspangler@chromium.org> Reviewed-by: Mulin Chao <mlchao@nuvoton.com>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit For instructions on building from source, refer to http://www.chromium.org/chromium-os/ec-development/getting-started-building-ec-images-quickly