pd: Don't auto toggle when DRP state is not dual role.stabilize-nocturne-10986.B

When in PD_STATE_DRP_AUTO_TOGGLE, we were always enabling DRP
auto-toggle, even when drp_state is PD_DRP_TOGGLE_OFF or
PD_DRP_FORCE_SINK, which prevents us from acting as source.

This caused an infinite loop of entering and exiting low power
mode when a sink-only device was plugged into a PS8751 port when
the system is in S5/G3.

To fix this, only enable DRP auto-toggle when drp_state allows
us to be dual-role.

One problem with doing this is that the ANX3429 doesn't support
low power mode with auto-toggle disabled. Luckily, the ANX3429
will stay in low power mode when a sink-only device is connected.

BRANCH=none
BUG=b:72007056,b:111663127
TEST=sink device + ANX3429: low power mode [1]
TEST=sink device + PS8751: low power mode [1]
TEST=charger via hub + ANX3429: 50% chance fail to charge [2]
TEST=charger via hub + PS8751: starts charging
(all tests with Grunt in G3)

[1] dut-control pp3300_tcpc_mw -> 3.5
[2] b/72007056 still remains to be fixed.

Change-Id: I22b9ed5ce93e1eeeb867fcc8bcd6dd803c0bc19b
Signed-off-by: Edward Hill <ecgh@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1188936
Reviewed-by: Aseda Aboagye <aaboagye@chromium.org>
Commit-Queue: Aseda Aboagye <aaboagye@chromium.org>
Tested-by: Aseda Aboagye <aaboagye@chromium.org>
(cherry picked from commit e86ebfa5121414cc67df3a09f2c4636569a3d617)
Reviewed-on: https://chromium-review.googlesource.com/1200568
Trybot-Ready: Aseda Aboagye <aaboagye@chromium.org>

0 files changed, 0 insertions, 0 deletions