Re: [PATCH v2 06/12] usb: typec: tcpm: add control message support to sop'

From: Heikki Krogerus
Date: Tue Dec 19 2023 - 09:13:39 EST

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On Thu, Dec 14, 2023 at 11:08:50PM +0000, RD Babiera wrote:
> Add tx_sop_type to tcpm_pd_send_control and rx_sop_type to
> tcpm_pd_ctrl_request. TCPC_TX_SOP is added to all pd_send_control calls,
> but TCPC_TX_SOP_PRIME is added to pd_send_control for a SOFT_RESET message
> sent after a Vconn swap that makes the Port the Vconn source. Likewise,
> tcpm_pd_ctrl_request resets the proper protocol layer depending on
> rx_sop_type for SOFT_RESET.
>
> VCONN_SWAP_TURN_ON_VCONN now moves to a new state,
> VCONN_SWAP_SEND_SOFT_RESET. This state sends SOFT_RESET over SOP' before
> transitioning to the ready state if applicable. It transitions after
> PD_T_VCONN_STABLE, definied in pd.h as the time required for Vconn to be
> on before transmitting messages.
>
> Signed-off-by: RD Babiera <rdbabiera@xxxxxxxxxx>

Reviewed-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>

> ---
> drivers/usb/typec/tcpm/tcpm.c | 159 ++++++++++++++++++++++++----------
> include/linux/usb/pd.h | 1 +
> 2 files changed, 115 insertions(+), 45 deletions(-)
>
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index bc6c5f04e62f..c1e1fd6bd60d 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -108,6 +108,7 @@
> S(VCONN_SWAP_WAIT_FOR_VCONN), \
> S(VCONN_SWAP_TURN_ON_VCONN), \
> S(VCONN_SWAP_TURN_OFF_VCONN), \
> + S(VCONN_SWAP_SEND_SOFT_RESET), \
> \
> S(FR_SWAP_SEND), \
> S(FR_SWAP_SEND_TIMEOUT), \
> @@ -2388,7 +2389,8 @@ static inline enum tcpm_state ready_state(struct tcpm_port *port)
> }
>
> static int tcpm_pd_send_control(struct tcpm_port *port,
> - enum pd_ctrl_msg_type type);
> + enum pd_ctrl_msg_type type,
> + enum tcpm_transmit_type tx_sop_type);
>
> static void tcpm_handle_alert(struct tcpm_port *port, const __le32 *payload,
> int cnt)
> @@ -2742,10 +2744,12 @@ static void tcpm_pps_complete(struct tcpm_port *port, int result)
> }
>
> static void tcpm_pd_ctrl_request(struct tcpm_port *port,
> - const struct pd_message *msg)
> + const struct pd_message *msg,
> + enum tcpm_transmit_type rx_sop_type)
> {
> enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
> enum tcpm_state next_state;
> + unsigned int rev = pd_header_rev_le(msg->header);
>
> /*
> * Stop VDM state machine if interrupted by other Messages while NOT_SUPP is allowed in
> @@ -2910,6 +2914,16 @@ static void tcpm_pd_ctrl_request(struct tcpm_port *port,
> case SOFT_RESET_SEND:
> if (port->ams == SOFT_RESET_AMS)
> tcpm_ams_finish(port);
> + /*
> + * SOP' Soft Reset is done after Vconn Swap,
> + * which returns to ready state
> + */
> + if (rx_sop_type == TCPC_TX_SOP_PRIME) {
> + if (rev < port->negotiated_rev_prime)
> + port->negotiated_rev_prime = rev;
> + tcpm_set_state(port, ready_state(port), 0);
> + break;
> + }
> if (port->pwr_role == TYPEC_SOURCE) {
> port->upcoming_state = SRC_SEND_CAPABILITIES;
> tcpm_ams_start(port, POWER_NEGOTIATION);
> @@ -3109,8 +3123,7 @@ static void tcpm_pd_rx_handler(struct kthread_work *work)
> if (msgid == port->rx_msgid_prime)
> goto done;
> port->rx_msgid_prime = msgid;
> - /* Ignore SOP' for now */
> - goto done;
> + break;
> case TCPC_TX_SOP:
> if (msgid == port->rx_msgid &&
> type != PD_CTRL_SOFT_RESET)
> @@ -3140,7 +3153,7 @@ static void tcpm_pd_rx_handler(struct kthread_work *work)
> else if (cnt)
> tcpm_pd_data_request(port, msg);
> else
> - tcpm_pd_ctrl_request(port, msg);
> + tcpm_pd_ctrl_request(port, msg, rx_sop_type);
> }
> }
>
> @@ -3167,17 +3180,40 @@ void tcpm_pd_receive(struct tcpm_port *port, const struct pd_message *msg,
> EXPORT_SYMBOL_GPL(tcpm_pd_receive);
>
> static int tcpm_pd_send_control(struct tcpm_port *port,
> - enum pd_ctrl_msg_type type)
> + enum pd_ctrl_msg_type type,
> + enum tcpm_transmit_type tx_sop_type)
> {
> struct pd_message msg;
>
> memset(&msg, 0, sizeof(msg));
> - msg.header = PD_HEADER_LE(type, port->pwr_role,
> - port->data_role,
> - port->negotiated_rev,
> - port->message_id, 0);
> + switch (tx_sop_type) {
> + case TCPC_TX_SOP_PRIME:
> + msg.header = PD_HEADER_LE(type,
> + 0, /* Cable Plug Indicator for DFP/UFP */
> + 0, /* Reserved */
> + port->negotiated_rev,
> + port->message_id_prime,
> + 0);
> + break;
> + case TCPC_TX_SOP:
> + msg.header = PD_HEADER_LE(type,
> + port->pwr_role,
> + port->data_role,
> + port->negotiated_rev,
> + port->message_id,
> + 0);
> + break;
> + default:
> + msg.header = PD_HEADER_LE(type,
> + port->pwr_role,
> + port->data_role,
> + port->negotiated_rev,
> + port->message_id,
> + 0);
> + break;
> + }
>
> - return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
> + return tcpm_pd_transmit(port, tx_sop_type, &msg);
> }
>
> /*
> @@ -3196,13 +3232,13 @@ static bool tcpm_send_queued_message(struct tcpm_port *port)
>
> switch (queued_message) {
> case PD_MSG_CTRL_WAIT:
> - tcpm_pd_send_control(port, PD_CTRL_WAIT);
> + tcpm_pd_send_control(port, PD_CTRL_WAIT, TCPC_TX_SOP);
> break;
> case PD_MSG_CTRL_REJECT:
> - tcpm_pd_send_control(port, PD_CTRL_REJECT);
> + tcpm_pd_send_control(port, PD_CTRL_REJECT, TCPC_TX_SOP);
> break;
> case PD_MSG_CTRL_NOT_SUPP:
> - tcpm_pd_send_control(port, PD_CTRL_NOT_SUPP);
> + tcpm_pd_send_control(port, PD_CTRL_NOT_SUPP, TCPC_TX_SOP);
> break;
> case PD_MSG_DATA_SINK_CAP:
> ret = tcpm_pd_send_sink_caps(port);
> @@ -4217,7 +4253,7 @@ static void run_state_machine(struct tcpm_port *port)
> case SRC_NEGOTIATE_CAPABILITIES:
> ret = tcpm_pd_check_request(port);
> if (ret < 0) {
> - tcpm_pd_send_control(port, PD_CTRL_REJECT);
> + tcpm_pd_send_control(port, PD_CTRL_REJECT, TCPC_TX_SOP);
> if (!port->explicit_contract) {
> tcpm_set_state(port,
> SRC_WAIT_NEW_CAPABILITIES, 0);
> @@ -4225,7 +4261,7 @@ static void run_state_machine(struct tcpm_port *port)
> tcpm_set_state(port, SRC_READY, 0);
> }
> } else {
> - tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
> + tcpm_pd_send_control(port, PD_CTRL_ACCEPT, TCPC_TX_SOP);
> tcpm_set_partner_usb_comm_capable(port,
> !!(port->sink_request & RDO_USB_COMM));
> tcpm_set_state(port, SRC_TRANSITION_SUPPLY,
> @@ -4234,7 +4270,7 @@ static void run_state_machine(struct tcpm_port *port)
> break;
> case SRC_TRANSITION_SUPPLY:
> /* XXX: regulator_set_voltage(vbus, ...) */
> - tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
> + tcpm_pd_send_control(port, PD_CTRL_PS_RDY, TCPC_TX_SOP);
> port->explicit_contract = true;
> typec_set_pwr_opmode(port->typec_port, TYPEC_PWR_MODE_PD);
> port->pwr_opmode = TYPEC_PWR_MODE_PD;
> @@ -4718,7 +4754,7 @@ static void run_state_machine(struct tcpm_port *port)
> /* remove existing capabilities */
> usb_power_delivery_unregister_capabilities(port->partner_source_caps);
> port->partner_source_caps = NULL;
> - tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
> + tcpm_pd_send_control(port, PD_CTRL_ACCEPT, TCPC_TX_SOP);
> tcpm_ams_finish(port);
> if (port->pwr_role == TYPEC_SOURCE) {
> port->upcoming_state = SRC_SEND_CAPABILITIES;
> @@ -4735,28 +4771,41 @@ static void run_state_machine(struct tcpm_port *port)
> tcpm_ams_start(port, SOFT_RESET_AMS);
> break;
> case SOFT_RESET_SEND:
> - port->message_id = 0;
> - port->rx_msgid = -1;
> - /* remove existing capabilities */
> - usb_power_delivery_unregister_capabilities(port->partner_source_caps);
> - port->partner_source_caps = NULL;
> - if (tcpm_pd_send_control(port, PD_CTRL_SOFT_RESET))
> - tcpm_set_state_cond(port, hard_reset_state(port), 0);
> - else
> - tcpm_set_state_cond(port, hard_reset_state(port),
> - PD_T_SENDER_RESPONSE);
> + /*
> + * Power Delivery 3.0 Section 6.3.13
> + *
> + * A Soft_Reset Message Shall be targeted at a specific entity
> + * depending on the type of SOP* packet used.
> + */
> + if (port->tx_sop_type == TCPC_TX_SOP_PRIME) {
> + port->message_id_prime = 0;
> + port->rx_msgid_prime = -1;
> + tcpm_pd_send_control(port, PD_CTRL_SOFT_RESET, TCPC_TX_SOP_PRIME);
> + tcpm_set_state_cond(port, ready_state(port), PD_T_SENDER_RESPONSE);
> + } else {
> + port->message_id = 0;
> + port->rx_msgid = -1;
> + /* remove existing capabilities */
> + usb_power_delivery_unregister_capabilities(port->partner_source_caps);
> + port->partner_source_caps = NULL;
> + if (tcpm_pd_send_control(port, PD_CTRL_SOFT_RESET, TCPC_TX_SOP))
> + tcpm_set_state_cond(port, hard_reset_state(port), 0);
> + else
> + tcpm_set_state_cond(port, hard_reset_state(port),
> + PD_T_SENDER_RESPONSE);
> + }
> break;
>
> /* DR_Swap states */
> case DR_SWAP_SEND:
> - tcpm_pd_send_control(port, PD_CTRL_DR_SWAP);
> + tcpm_pd_send_control(port, PD_CTRL_DR_SWAP, TCPC_TX_SOP);
> if (port->data_role == TYPEC_DEVICE || port->negotiated_rev > PD_REV20)
> port->send_discover = true;
> tcpm_set_state_cond(port, DR_SWAP_SEND_TIMEOUT,
> PD_T_SENDER_RESPONSE);
> break;
> case DR_SWAP_ACCEPT:
> - tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
> + tcpm_pd_send_control(port, PD_CTRL_ACCEPT, TCPC_TX_SOP);
> if (port->data_role == TYPEC_DEVICE || port->negotiated_rev > PD_REV20)
> port->send_discover = true;
> tcpm_set_state_cond(port, DR_SWAP_CHANGE_DR, 0);
> @@ -4780,7 +4829,7 @@ static void run_state_machine(struct tcpm_port *port)
> break;
>
> case FR_SWAP_SEND:
> - if (tcpm_pd_send_control(port, PD_CTRL_FR_SWAP)) {
> + if (tcpm_pd_send_control(port, PD_CTRL_FR_SWAP, TCPC_TX_SOP)) {
> tcpm_set_state(port, ERROR_RECOVERY, 0);
> break;
> }
> @@ -4800,7 +4849,7 @@ static void run_state_machine(struct tcpm_port *port)
> break;
> case FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED:
> tcpm_set_pwr_role(port, TYPEC_SOURCE);
> - if (tcpm_pd_send_control(port, PD_CTRL_PS_RDY)) {
> + if (tcpm_pd_send_control(port, PD_CTRL_PS_RDY, TCPC_TX_SOP)) {
> tcpm_set_state(port, ERROR_RECOVERY, 0);
> break;
> }
> @@ -4810,11 +4859,11 @@ static void run_state_machine(struct tcpm_port *port)
>
> /* PR_Swap states */
> case PR_SWAP_ACCEPT:
> - tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
> + tcpm_pd_send_control(port, PD_CTRL_ACCEPT, TCPC_TX_SOP);
> tcpm_set_state(port, PR_SWAP_START, 0);
> break;
> case PR_SWAP_SEND:
> - tcpm_pd_send_control(port, PD_CTRL_PR_SWAP);
> + tcpm_pd_send_control(port, PD_CTRL_PR_SWAP, TCPC_TX_SOP);
> tcpm_set_state_cond(port, PR_SWAP_SEND_TIMEOUT,
> PD_T_SENDER_RESPONSE);
> break;
> @@ -4856,7 +4905,7 @@ static void run_state_machine(struct tcpm_port *port)
> * supply is turned off"
> */
> tcpm_set_pwr_role(port, TYPEC_SINK);
> - if (tcpm_pd_send_control(port, PD_CTRL_PS_RDY)) {
> + if (tcpm_pd_send_control(port, PD_CTRL_PS_RDY, TCPC_TX_SOP)) {
> tcpm_set_state(port, ERROR_RECOVERY, 0);
> break;
> }
> @@ -4903,17 +4952,17 @@ static void run_state_machine(struct tcpm_port *port)
> * Source."
> */
> tcpm_set_pwr_role(port, TYPEC_SOURCE);
> - tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
> + tcpm_pd_send_control(port, PD_CTRL_PS_RDY, TCPC_TX_SOP);
> tcpm_set_state(port, SRC_STARTUP, PD_T_SWAP_SRC_START);
> break;
>
> case VCONN_SWAP_ACCEPT:
> - tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
> + tcpm_pd_send_control(port, PD_CTRL_ACCEPT, TCPC_TX_SOP);
> tcpm_ams_finish(port);
> tcpm_set_state(port, VCONN_SWAP_START, 0);
> break;
> case VCONN_SWAP_SEND:
> - tcpm_pd_send_control(port, PD_CTRL_VCONN_SWAP);
> + tcpm_pd_send_control(port, PD_CTRL_VCONN_SWAP, TCPC_TX_SOP);
> tcpm_set_state(port, VCONN_SWAP_SEND_TIMEOUT,
> PD_T_SENDER_RESPONSE);
> break;
> @@ -4932,14 +4981,34 @@ static void run_state_machine(struct tcpm_port *port)
> PD_T_VCONN_SOURCE_ON);
> break;
> case VCONN_SWAP_TURN_ON_VCONN:
> - tcpm_set_vconn(port, true);
> - tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
> - tcpm_set_state(port, ready_state(port), 0);
> + ret = tcpm_set_vconn(port, true);
> + tcpm_pd_send_control(port, PD_CTRL_PS_RDY, TCPC_TX_SOP);
> + /*
> + * USB PD 3.0 Section 6.4.4.3.1
> + *
> + * Note that a Cable Plug or VPD will not be ready for PD
> + * Communication until tVCONNStable after VCONN has been applied
> + */
> + if (!ret)
> + tcpm_set_state(port, VCONN_SWAP_SEND_SOFT_RESET,
> + PD_T_VCONN_STABLE);
> + else
> + tcpm_set_state(port, ready_state(port), 0);
> break;
> case VCONN_SWAP_TURN_OFF_VCONN:
> tcpm_set_vconn(port, false);
> tcpm_set_state(port, ready_state(port), 0);
> break;
> + case VCONN_SWAP_SEND_SOFT_RESET:
> + tcpm_swap_complete(port, port->swap_status);
> + if (tcpm_can_communicate_sop_prime(port)) {
> + port->tx_sop_type = TCPC_TX_SOP_PRIME;
> + port->upcoming_state = SOFT_RESET_SEND;
> + tcpm_ams_start(port, SOFT_RESET_AMS);
> + } else {
> + tcpm_set_state(port, ready_state(port), 0);
> + }
> + break;
>
> case DR_SWAP_CANCEL:
> case PR_SWAP_CANCEL:
> @@ -4975,7 +5044,7 @@ static void run_state_machine(struct tcpm_port *port)
> }
> break;
> case GET_STATUS_SEND:
> - tcpm_pd_send_control(port, PD_CTRL_GET_STATUS);
> + tcpm_pd_send_control(port, PD_CTRL_GET_STATUS, TCPC_TX_SOP);
> tcpm_set_state(port, GET_STATUS_SEND_TIMEOUT,
> PD_T_SENDER_RESPONSE);
> break;
> @@ -4983,7 +5052,7 @@ static void run_state_machine(struct tcpm_port *port)
> tcpm_set_state(port, ready_state(port), 0);
> break;
> case GET_PPS_STATUS_SEND:
> - tcpm_pd_send_control(port, PD_CTRL_GET_PPS_STATUS);
> + tcpm_pd_send_control(port, PD_CTRL_GET_PPS_STATUS, TCPC_TX_SOP);
> tcpm_set_state(port, GET_PPS_STATUS_SEND_TIMEOUT,
> PD_T_SENDER_RESPONSE);
> break;
> @@ -4991,7 +5060,7 @@ static void run_state_machine(struct tcpm_port *port)
> tcpm_set_state(port, ready_state(port), 0);
> break;
> case GET_SINK_CAP:
> - tcpm_pd_send_control(port, PD_CTRL_GET_SINK_CAP);
> + tcpm_pd_send_control(port, PD_CTRL_GET_SINK_CAP, TCPC_TX_SOP);
> tcpm_set_state(port, GET_SINK_CAP_TIMEOUT, PD_T_SENDER_RESPONSE);
> break;
> case GET_SINK_CAP_TIMEOUT:
> @@ -5031,7 +5100,7 @@ static void run_state_machine(struct tcpm_port *port)
>
> /* Chunk state */
> case CHUNK_NOT_SUPP:
> - tcpm_pd_send_control(port, PD_CTRL_NOT_SUPP);
> + tcpm_pd_send_control(port, PD_CTRL_NOT_SUPP, TCPC_TX_SOP);
> tcpm_set_state(port, port->pwr_role == TYPEC_SOURCE ? SRC_READY : SNK_READY, 0);
> break;
> default:
> diff --git a/include/linux/usb/pd.h b/include/linux/usb/pd.h
> index eb626af0e4e7..d50098fb16b5 100644
> --- a/include/linux/usb/pd.h
> +++ b/include/linux/usb/pd.h
> @@ -483,6 +483,7 @@ static inline unsigned int rdo_max_power(u32 rdo)
> #define PD_T_BIST_CONT_MODE 50 /* 30 - 60 ms */
> #define PD_T_SINK_TX 16 /* 16 - 20 ms */
> #define PD_T_CHUNK_NOT_SUPP 42 /* 40 - 50 ms */
> +#define PD_T_VCONN_STABLE 50
>
> #define PD_T_DRP_TRY 100 /* 75 - 150 ms */
> #define PD_T_DRP_TRYWAIT 600 /* 400 - 800 ms */
> --
> 2.43.0.472.g3155946c3a-goog

--
heikki

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