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If an ITIM32 timeout event occurred during lpc_sib_wait_host_read_done() and lpc_sib_wait_host_write_done() routines, in rare case, ec might have a chance to gets stuck since ec's interrupts are disabled when CSWR/CSRD bits are high forever. (Normally, CSWR/CSRD bits won't be always high. These bits are high forever also means something wrong on LPC/eSPI bus.) In order to prevent this situation, the CL checks TO_STS bit of ITCTS in these routines. If this bit is set, restoring ITIM32 preload counter value to maximum value and processing overflow will be done by force_time(). BRANCH=eve,fizz,poppy BUG=b:76182199 TEST=No build errors for npcx series. Passed test command of CL 979389 on npcx_evb. No symptom occurred during warm reset stress test on soraka. Change-Id: Ic645f7c5a2a1e49a3c1f3d7e089dd66b4bb75ac6 Signed-off-by: Mulin Chao <mlchao@nuvoton.com> Reviewed-on: https://chromium-review.googlesource.com/979874 Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>
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