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Reads to RTC_SSR may be invalid if they occur close to the RTCCLK edge. As suggested by the datasheet, perform consecutive identical reads to ensure the read is valid. BUG=chrome-os-partner:37216 TEST=Manual on Samus. Repeatedly call rtc_read in test function, verify that RTC_SSR never incorrectly ticks up. BRANCH=Samus Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org> Change-Id: Ib26fbfab4a07263f638c580066e993675dd8c451 Reviewed-on: https://chromium-review.googlesource.com/254725 Reviewed-by: Alec Berg <alecaberg@chromium.org>