parade/ps8640: add delay to every loop when polling ps8640 ready

Add delay before and in polling ps8640 ready to reduce the frequency
of polling.

BUG=chrome-os-partner:54897
BRANCH=none
TEST=build pass elm and show ui

Change-Id: I43c833af910490e53496a343330a6a6af35623a9
Signed-off-by: Martin Roth <martinroth@chromium.org>
Original-Commit-Id: bc8c3d6f7cf0b2da693a465cf3845e8bbc53825a
Original-Change-Id: I5c725eed8110ff9f545c1142ca28bcff336b6860
Original-Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/371718
Original-Commit-Ready: Nicolas Boichat <drinkcat@chromium.org>
Original-Tested-by: jitao shi <jitao.shi@mediatek.com>
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Original-Reviewed-by: Daniel Kurtz <djkurtz@chromium.org>
Reviewed-on: https://review.coreboot.org/16364
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
1 file changed