tcpmv2: warm start DBG_ACC_SNK correctly

DBG_ACC_SNK connections are warm starting in
ATTACHED_SNK and this is not correct.  Added
BBRMFLG to keep track and jump back to the
correct SNK entry state.

BUG=none
BRANCH=none
TEST=connect a DBGACC and reboot should reconnect DBGACC

Signed-off-by: Denis Brockus <dbrockus@google.com>
Change-Id: I4a17c2487a18ed0e4d58954e8d5ade08b4d44fff
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2191815
Tested-by: Denis Brockus <dbrockus@chromium.org>
Reviewed-by: Diana Z <dzigterman@chromium.org>
Commit-Queue: Denis Brockus <dbrockus@chromium.org>
Auto-Submit: Denis Brockus <dbrockus@chromium.org>

Author: brockus-zephyr

common/usbc/usb_tc_drp_acc_trysrc_sm.c

@@ -1070,7 +1070,10 @@ void tc_state_init(int port)
 			 * change the data role when we get to the state.
 			 */
 			TC_SET_FLAG(port, TC_FLAGS_TC_WARM_ATTACHED_SNK);
-			set_state_tc(port, TC_ATTACHED_SNK);
+			set_state_tc(port,
+				(saved_flgs[port] & PD_BBRMFLG_DBGACC_ROLE)
+					? TC_DBG_ACC_SNK
+					: TC_ATTACHED_SNK);
 		} else {
 			restart_tc_sm(port, TC_UNATTACHED_SNK);
 			/*
@@ -2107,6 +2110,9 @@ static void tc_unoriented_dbg_acc_src_entry(const int port)
 	/* Enable auto discharge disconnect, if not PR Swapping */
 	if (!TC_CHK_FLAG(port, TC_FLAGS_PR_SWAP_IN_PROGRESS))
 		tcpm_enable_auto_discharge_disconnect(port, 1);
+
+	/* Save our current connection is a DEBUG ACCESSORY */
+	pd_update_saved_port_flags(port, PD_BBRMFLG_DBGACC_ROLE, 1);
 }
 
 static void tc_unoriented_dbg_acc_src_run(const int port)
@@ -2208,6 +2214,9 @@ static void tc_unoriented_dbg_acc_src_exit(const int port)
 
 	/* Clear PR swap flag */
 	TC_CLR_FLAG(port, TC_FLAGS_DO_PR_SWAP);
+
+	/* Save our current connection is not a DEBUG ACCESSORY */
+	pd_update_saved_port_flags(port, PD_BBRMFLG_DBGACC_ROLE, 0);
 }
 
 /**
@@ -2247,10 +2256,16 @@ static void tc_dbg_acc_snk_entry(const int port)
 		pd_set_polarity(port, tc[port].polarity);
 
 		/*
-		 * Initial data role for sink is UFP
+		 * Initial data role for sink is UFP unless this is a warm
+		 * attach.  If it is a warm attach, the data role will be
+		 * restored to the current connect role and will already
+		 * have called tc_set_data_role with the appropriate role.
 		 * This also sets the usb mux
 		 */
-		tc_set_data_role(port, PD_ROLE_UFP);
+		if (TC_CHK_FLAG(port, TC_FLAGS_TC_WARM_ATTACHED_SNK))
+			TC_CLR_FLAG(port, TC_FLAGS_TC_WARM_ATTACHED_SNK);
+		else
+			tc_set_data_role(port, PD_ROLE_UFP);
 
 		if (IS_ENABLED(CONFIG_CHARGE_MANAGER)) {
 			tc[port].typec_curr =
@@ -2272,6 +2287,9 @@ static void tc_dbg_acc_snk_entry(const int port)
 	/* Enable auto discharge disconnect, if not PR Swapping */
 	if (!TC_CHK_FLAG(port, TC_FLAGS_PR_SWAP_IN_PROGRESS))
 		tcpm_enable_auto_discharge_disconnect(port, 1);
+
+	/* Save our current connection is a DEBUG ACCESSORY */
+	pd_update_saved_port_flags(port, PD_BBRMFLG_DBGACC_ROLE, 1);
 }
 
 static void tc_dbg_acc_snk_run(const int port)
@@ -2350,6 +2368,9 @@ static void tc_dbg_acc_snk_exit(const int port)
 
 	/* Stop drawing power */
 	sink_stop_drawing_current(port);
+
+	/* Save our current connection is not a DEBUG ACCESSORY */
+	pd_update_saved_port_flags(port, PD_BBRMFLG_DBGACC_ROLE, 0);
 }
 
 /**

include/usb_pd.h

@@ -889,6 +889,7 @@ enum pd_states {
 #define PD_BBRMFLG_POWER_ROLE        BIT(1)
 #define PD_BBRMFLG_DATA_ROLE         BIT(2)
 #define PD_BBRMFLG_VCONN_ROLE        BIT(3)
+#define PD_BBRMFLG_DBGACC_ROLE       BIT(4)
 
 /* Initial value for CC debounce variable */
 #define PD_CC_UNSET -1