anx7447.c: change VBUS present detection interface

ANX PD has two way to get VBUS present info, 1:ADC, 2:Comparator
the ADC has been reset at chip reset stage, the comparator(0x1e:bit2)
is analog part, it is not been reset by chip reset.
there is a corner case which EC TCPM detect VBUS present info at
chip reset stage(at system rebooting stage, EC TCPM issue TEST_R
signal, this will trigger chip hardware reset).
the original VBUS present function checks the VBUS from ADC, the
ADC register value became to 0 while at chip reset stage, so at this
moment, EC TCPM need check 0x1e:bit2 to get real VBUS present info.

BRANCH=None
BUG=b:129092057
TEST=Tested on Phaser, reboot stress test.

Change-Id: I1e847c88b22684bc9b17243628179bad534801b2
Signed-off-by: Xin Ji <xji@analogixsemi.com>
Reviewed-on: https://chromium-review.googlesource.com/1535085
Commit-Ready: Justin TerAvest <teravest@chromium.org>
Tested-by: Justin TerAvest <teravest@chromium.org>
Reviewed-by: Jett Rink <jettrink@chromium.org>
Reviewed-by: Diana Z <dzigterman@chromium.org>

0 files changed, 0 insertions, 0 deletions