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It is not necessary to enable Bank B, as we do not use it. Also, we have seen a race between enabling the banks and writing the brightness register to 0xFF, where the chip would reset the value after it has been set by EC. Adding a short 100us sleep fixes the issue. BRANCH=none BUG=b:69379749 TEST=Flash whiskers, pwm 0 50 works, even after a cold reset. Change-Id: Ic523a2475c3874c8433eb1b39e927793dd893e8f Signed-off-by: Nicolas Boichat <drinkcat@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/906165 Reviewed-by: Aseda Aboagye <aaboagye@chromium.org> Reviewed-by: Edward Hill <ecgh@chromium.org> Reviewed-by: Benjamin Gordon <bmgordon@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