TCPMV2: PD Policy Management for honeybuns

Port discovery DR and VCONN Swap Policy.
For port0: If dr_swap_to_dfp_flag is true and port
           data role is DFP, transition to pe_drs_send_swap

For port1: If dr_swap_to_dfp_flag is true and port
           data role is UFP, transition to pe_drs_send_swap

BUG=b:183026242
BRANCH=none
TEST=make runtests
     Tested on Voxel by plugging in a dock

Signed-off-by: Sam Hurst <shurst@google.com>
Change-Id: I2f7d29264bfc978d54675aab5faa9d2c6bc30a80
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2783441
Reviewed-by: Scott Collyer <scollyer@chromium.org>
Reviewed-by: Diana Z <dzigterman@chromium.org>

1 files changed, 35 insertions, 0 deletions

diff --git a/baseboard/honeybuns/usb_pd_policy.c b/baseboard/honeybuns/usb_pd_policy.c
index f91f2e7076..3a670b51ff 100644
--- a/baseboard/honeybuns/usb_pd_policy.c
+++ b/baseboard/honeybuns/usb_pd_policy.c
@@ -66,6 +66,41 @@ int dpm_get_source_pdo(const uint32_t **src_pdo, const int port)
 	return pdo_cnt;
 }
 
+/*
+ * Default Port Discovery DR Swap Policy.
+ *
+ * 1) If port == 0 and port data role is DFP, transition to pe_drs_send_swap
+ * 2) If port == 1 and port data role is UFP, transition to pe_drs_send_swap
+ */
+__override bool port_discovery_dr_swap_policy(int port,
+			enum pd_data_role dr, bool dr_swap_flag)
+{
+	/*
+	 * Port0: test if role is DFP
+	 * Port1: test if role is UFP
+	 */
+	enum pd_data_role role_test =
+		(port == USB_PD_PORT_HOST) ? PD_ROLE_DFP : PD_ROLE_UFP;
+
+	if (dr == role_test)
+		return true;
+
+	/* Do not perform a DR swap */
+	return false;
+}
+
+/*
+ * Default Port Discovery VCONN Swap Policy.
+ *
+ * 1) Never perform VCONN swap
+ */
+__override bool port_discovery_vconn_swap_policy(int port,
+			bool vconn_swap_flag)
+{
+	/* Do not perform a VCONN swap */
+	return false;
+}
+
 int pd_check_vconn_swap(int port)
 {
 	/*TODO: Dock is the Vconn source */