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pd: ensure power role matches CC pull resistor after hard reset

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Make sure the power role and the CC pull resistor match after
receiving hard reset command in the middle of a swap.

BUG=none
BRANCH=samus
TEST=on samus connect left and right ports together with C to C
cable. note that after some collisions and some hard resets, it
eventually stabilizes with one port in SNK_READY, the other in
SRC_READY. without this CL, we get stuck executing a power swap
and our power role and CC resistor get out of sync, requiring
a reboot.

Change-Id: Ia1385eb3a1c503052ad5bfd0d1595ecc096cd5f4
Signed-off-by: Alec Berg <alecaberg@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/239976
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
Reviewed-by: Todd Broch <tbroch@chromium.org>
This commit is contained in:
Alec Berg
2015-01-09 14:02:53 -08:00
parent 5c26087ef3
commit 347c7313a0
1 changed files with 14 additions and 0 deletions
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14
common/usb_pd_protocol.c
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@@ -813,6 +813,20 @@ static void execute_hard_reset(int port)
#endif
#ifdef CONFIG_USB_PD_DUAL_ROLE
/*
* If we are swapping to a source and have changed to Rp, restore back
* to Rd to match our power_role.
*/
if (pd[port].task_state == PD_STATE_SNK_SWAP_STANDBY ||
pd[port].task_state == PD_STATE_SNK_SWAP_COMPLETE)
pd_set_host_mode(port, 0);
/*
* If we are swapping to a sink and have changed to Rd, change role to
* sink to match the CC pull resistor.
*/
if (pd[port].task_state == PD_STATE_SRC_SWAP_STANDBY)
pd[port].power_role = PD_ROLE_SINK;
if (pd[port].power_role == PD_ROLE_SINK) {
/* Clear the input current limit */
pd_set_input_current_limit(port, 0, 0);