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4e46386877
fusb302 determines attach / no-attach (and Rd / Ra) by comparing CC voltage against an MDAC output (42 mV steps). The previous 'floor' calculation was particularly bad for 3.0A Rp (2600 / 42 = 61, 61 * 42 = 2562 mV - 21 = 2551 mV actual threshold, ignoring other error sources). Reduce the chance of error by rounding our thresholds, which also matches the suggested thresholds in the datasheet. BUG=chromium:758608 BRANCH=gru TEST=Attach problematic dingdong, verify we don't enter an attach / detach loop. Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org> Change-Id: I9211782da0fdad8339246e272952ba1930b69851 Reviewed-on: https://chromium-review.googlesource.com/633276 Reviewed-by: Joe Bauman <joe.bauman@fairchildsemi.com> Reviewed-by: Vincent Palatin <vpalatin@chromium.org> (cherry picked from commit 311b3e4e15fd37ea2ab151edb8b8a468e93355fd) Reviewed-on: https://chromium-review.googlesource.com/638694 Commit-Ready: Shawn N <shawnn@chromium.org> Tested-by: Shawn N <shawnn@chromium.org> Reviewed-by: Shawn N <shawnn@chromium.org>