[v5,1/3] usb: typec: tcpm: AMS and Collision Avoidance

Message ID	20210105163927.1376770-2-kyletso@google.com (mailing list archive)
State	Superseded
Headers	show Return-Path: <linux-usb-owner@kernel.org> Sender: "kyletso via sendgmr" <kyletso@kyletso.ntc.corp.google.com> Date: Wed, 6 Jan 2021 00:39:25 +0800 In-Reply-To: <20210105163927.1376770-1-kyletso@google.com> Message-Id: <20210105163927.1376770-2-kyletso@google.com> Mime-Version: 1.0 References: <20210105163927.1376770-1-kyletso@google.com> Subject: [PATCH v5 1/3] usb: typec: tcpm: AMS and Collision Avoidance From: Kyle Tso <kyletso@google.com> To: linux@roeck-us.net, heikki.krogerus@linux.intel.com, gregkh@linuxfoundation.org, hdegoede@redhat.com Cc: badhri@google.com, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Kyle Tso <kyletso@google.com>, Will McVicker <willmcvicker@google.com> Content-Type: text/plain; charset="UTF-8" Precedence: bulk
Series	AMS, Collision Avoidance, and Protocol Error \| expand [v5,0/3] AMS, Collision Avoidance, and Protocol Error [v5,1/3] usb: typec: tcpm: AMS and Collision Avoidance [v5,2/3] usb: typec: tcpm: Protocol Error handling [v5,3/3] usb: typec: tcpm: Respond Wait if VDM state machine is running

Kyle Tso Jan. 5, 2021, 4:39 p.m. UTC

This patch provides the implementation of Collision Avoidance introduced
in PD3.0. The start of each Atomic Message Sequence (AMS) initiated by
the port will be denied if the current AMS is not interruptible. The
Source port will set the CC to SinkTxNG if it is going to initiate an
AMS, and SinkTxOk otherwise. Meanwhile, any AMS initiated by a Sink port
will be denied in TCPM if the port partner (Source) sets SinkTxNG except
for HARD_RESET and SOFT_RESET.

Signed-off-by: Kyle Tso <kyletso@google.com>
Signed-off-by: Will McVicker <willmcvicker@google.com>
---
Changelog since v4:
 - rebased to ToT

 drivers/usb/typec/tcpm/tcpm.c | 533 ++++++++++++++++++++++++++++++----
 include/linux/usb/pd.h        |   1 +
 include/linux/usb/tcpm.h      |   4 +
 3 files changed, 479 insertions(+), 59 deletions(-)

Heikki Krogerus Jan. 12, 2021, 1:29 p.m. UTC | #1

On Wed, Jan 06, 2021 at 12:39:25AM +0800, Kyle Tso wrote:
> This patch provides the implementation of Collision Avoidance introduced
> in PD3.0. The start of each Atomic Message Sequence (AMS) initiated by
> the port will be denied if the current AMS is not interruptible. The
> Source port will set the CC to SinkTxNG if it is going to initiate an
> AMS, and SinkTxOk otherwise. Meanwhile, any AMS initiated by a Sink port
> will be denied in TCPM if the port partner (Source) sets SinkTxNG except
> for HARD_RESET and SOFT_RESET.
> 
> Signed-off-by: Kyle Tso <kyletso@google.com>
> Signed-off-by: Will McVicker <willmcvicker@google.com>

So did you and Will develop this patch together?

Few nitpicks below.

> ---
> Changelog since v4:
>  - rebased to ToT
> 
>  drivers/usb/typec/tcpm/tcpm.c | 533 ++++++++++++++++++++++++++++++----
>  include/linux/usb/pd.h        |   1 +
>  include/linux/usb/tcpm.h      |   4 +
>  3 files changed, 479 insertions(+), 59 deletions(-)
> 
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index 22a85b396f69..9fb3ec176f42 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -76,6 +76,8 @@
>  	S(SNK_HARD_RESET_SINK_ON),		\
>  						\
>  	S(SOFT_RESET),				\
> +	S(SRC_SOFT_RESET_WAIT_SNK_TX),		\
> +	S(SNK_SOFT_RESET),			\
>  	S(SOFT_RESET_SEND),			\
>  						\
>  	S(DR_SWAP_ACCEPT),			\
> @@ -139,7 +141,45 @@
>  						\
>  	S(ERROR_RECOVERY),			\
>  	S(PORT_RESET),				\
> -	S(PORT_RESET_WAIT_OFF)
> +	S(PORT_RESET_WAIT_OFF),			\
> +						\
> +	S(AMS_START)
> +
> +#define FOREACH_AMS(S)				\
> +	S(NONE_AMS),				\
> +	S(POWER_NEGOTIATION),			\
> +	S(GOTOMIN),				\
> +	S(SOFT_RESET_AMS),			\
> +	S(HARD_RESET),				\
> +	S(CABLE_RESET),				\
> +	S(GET_SOURCE_CAPABILITIES),		\
> +	S(GET_SINK_CAPABILITIES),		\
> +	S(POWER_ROLE_SWAP),			\
> +	S(FAST_ROLE_SWAP),			\
> +	S(DATA_ROLE_SWAP),			\
> +	S(VCONN_SWAP),				\
> +	S(SOURCE_ALERT),			\
> +	S(GETTING_SOURCE_EXTENDED_CAPABILITIES),\
> +	S(GETTING_SOURCE_SINK_STATUS),		\
> +	S(GETTING_BATTERY_CAPABILITIES),	\
> +	S(GETTING_BATTERY_STATUS),		\
> +	S(GETTING_MANUFACTURER_INFORMATION),	\
> +	S(SECURITY),				\
> +	S(FIRMWARE_UPDATE),			\
> +	S(DISCOVER_IDENTITY),			\
> +	S(SOURCE_STARTUP_CABLE_PLUG_DISCOVER_IDENTITY),	\
> +	S(DISCOVER_SVIDS),			\
> +	S(DISCOVER_MODES),			\
> +	S(DFP_TO_UFP_ENTER_MODE),		\
> +	S(DFP_TO_UFP_EXIT_MODE),		\
> +	S(DFP_TO_CABLE_PLUG_ENTER_MODE),	\
> +	S(DFP_TO_CABLE_PLUG_EXIT_MODE),		\
> +	S(ATTENTION),				\
> +	S(BIST),				\
> +	S(UNSTRUCTURED_VDMS),			\
> +	S(STRUCTURED_VDMS),			\
> +	S(COUNTRY_INFO),			\
> +	S(COUNTRY_CODES)
>  
>  #define GENERATE_ENUM(e)	e
>  #define GENERATE_STRING(s)	#s
> @@ -152,6 +192,14 @@ static const char * const tcpm_states[] = {
>  	FOREACH_STATE(GENERATE_STRING)
>  };
>  
> +enum tcpm_ams {
> +	FOREACH_AMS(GENERATE_ENUM)
> +};
> +
> +static const char * const tcpm_ams_str[] = {
> +	FOREACH_AMS(GENERATE_STRING)
> +};
> +
>  enum vdm_states {
>  	VDM_STATE_ERR_BUSY = -3,
>  	VDM_STATE_ERR_SEND = -2,
> @@ -161,6 +209,7 @@ enum vdm_states {
>  	VDM_STATE_READY = 1,
>  	VDM_STATE_BUSY = 2,
>  	VDM_STATE_WAIT_RSP_BUSY = 3,
> +	VDM_STATE_SEND_MESSAGE = 4,
>  };
>  
>  enum pd_msg_request {
> @@ -381,6 +430,11 @@ struct tcpm_port {
>  	/* Sink caps have been queried */
>  	bool sink_cap_done;
>  
> +	/* Collision Avoidance and Atomic Message Sequence */
> +	enum tcpm_state upcoming_state;
> +	enum tcpm_ams ams;
> +	bool in_ams;
> +
>  #ifdef CONFIG_DEBUG_FS
>  	struct dentry *dentry;
>  	struct mutex logbuffer_lock;	/* log buffer access lock */
> @@ -396,6 +450,12 @@ struct pd_rx_event {
>  	struct pd_message msg;
>  };
>  
> +static const char * const pd_rev[] = {
> +	[PD_REV10]		= "rev1",
> +	[PD_REV20]		= "rev2",
> +	[PD_REV30]		= "rev3",
> +};
> +
>  #define tcpm_cc_is_sink(cc) \
>  	((cc) == TYPEC_CC_RP_DEF || (cc) == TYPEC_CC_RP_1_5 || \
>  	 (cc) == TYPEC_CC_RP_3_0)
> @@ -440,6 +500,10 @@ struct pd_rx_event {
>  	((port)->typec_caps.data == TYPEC_PORT_DFP ? \
>  	TYPEC_HOST : TYPEC_DEVICE)
>  
> +#define tcpm_sink_tx_ok(port) \
> +	(tcpm_port_is_sink(port) && \
> +	((port)->cc1 == TYPEC_CC_RP_3_0 || (port)->cc2 == TYPEC_CC_RP_3_0))
> +
>  static enum tcpm_state tcpm_default_state(struct tcpm_port *port)
>  {
>  	if (port->port_type == TYPEC_PORT_DRP) {
> @@ -666,6 +730,35 @@ static void tcpm_debugfs_exit(const struct tcpm_port *port) { }
>  
>  #endif
>  
> +static void tcpm_set_cc(struct tcpm_port *port, enum typec_cc_status cc)
> +{
> +	tcpm_log(port, "cc:=%d", cc);
> +	port->cc_req = cc;
> +	port->tcpc->set_cc(port->tcpc, cc);
> +}
> +
> +static enum typec_cc_status tcpm_rp_cc(struct tcpm_port *port);

I think you should move the function here instead of adding the
prototype for it.

> +static int tcpm_ams_finish(struct tcpm_port *port)
> +{
> +	int ret = 0;
> +
> +	tcpm_log(port, "AMS %s finished", tcpm_ams_str[port->ams]);
> +
> +	if (port->pd_capable && port->pwr_role == TYPEC_SOURCE) {
> +		if (port->negotiated_rev >= PD_REV30)
> +			tcpm_set_cc(port, SINK_TX_OK);
> +		else
> +			tcpm_set_cc(port, SINK_TX_NG);
> +	} else if (port->pwr_role == TYPEC_SOURCE) {
> +		tcpm_set_cc(port, tcpm_rp_cc(port));
> +	}
> +
> +	port->in_ams = false;
> +	port->ams = NONE_AMS;
> +
> +	return ret;
> +}
> +
>  static int tcpm_pd_transmit(struct tcpm_port *port,
>  			    enum tcpm_transmit_type type,
>  			    const struct pd_message *msg)
> @@ -693,13 +786,30 @@ static int tcpm_pd_transmit(struct tcpm_port *port,
>  	switch (port->tx_status) {
>  	case TCPC_TX_SUCCESS:
>  		port->message_id = (port->message_id + 1) & PD_HEADER_ID_MASK;
> -		return 0;
> +		/*
> +		 * USB PD rev 2.0, 8.3.2.2.1:
> +		 * USB PD rev 3.0, 8.3.2.1.3:
> +		 * "... Note that every AMS is Interruptible until the first
> +		 * Message in the sequence has been successfully sent (GoodCRC
> +		 * Message received)."
> +		 */
> +		if (port->ams != NONE_AMS)
> +			port->in_ams = true;
> +		break;
>  	case TCPC_TX_DISCARDED:
> -		return -EAGAIN;
> +		ret = -EAGAIN;
> +		break;
>  	case TCPC_TX_FAILED:
>  	default:
> -		return -EIO;
> +		ret = -EIO;
> +		break;
>  	}
> +
> +	/* Some AMS don't expect responses. Finish them here. */
> +	if (port->ams == ATTENTION || port->ams == SOURCE_ALERT)
> +		tcpm_ams_finish(port);
> +
> +	return ret;
>  }
>  
>  void tcpm_pd_transmit_complete(struct tcpm_port *port,
> @@ -1000,16 +1110,17 @@ static void tcpm_set_state(struct tcpm_port *port, enum tcpm_state state,
>  			   unsigned int delay_ms)
>  {
>  	if (delay_ms) {
> -		tcpm_log(port, "pending state change %s -> %s @ %u ms",
> -			 tcpm_states[port->state], tcpm_states[state],
> -			 delay_ms);
> +		tcpm_log(port, "pending state change %s -> %s @ %u ms [%s %s]",
> +			 tcpm_states[port->state], tcpm_states[state], delay_ms,
> +			 pd_rev[port->negotiated_rev], tcpm_ams_str[port->ams]);
>  		port->delayed_state = state;
>  		mod_tcpm_delayed_work(port, delay_ms);
>  		port->delayed_runtime = ktime_add(ktime_get(), ms_to_ktime(delay_ms));
>  		port->delay_ms = delay_ms;
>  	} else {
> -		tcpm_log(port, "state change %s -> %s",
> -			 tcpm_states[port->state], tcpm_states[state]);
> +		tcpm_log(port, "state change %s -> %s [%s %s]",
> +			 tcpm_states[port->state], tcpm_states[state],
> +			 pd_rev[port->negotiated_rev], tcpm_ams_str[port->ams]);
>  		port->delayed_state = INVALID_STATE;
>  		port->prev_state = port->state;
>  		port->state = state;
> @@ -1031,10 +1142,11 @@ static void tcpm_set_state_cond(struct tcpm_port *port, enum tcpm_state state,
>  		tcpm_set_state(port, state, delay_ms);
>  	else
>  		tcpm_log(port,
> -			 "skipped %sstate change %s -> %s [%u ms], context state %s",
> +			 "skipped %sstate change %s -> %s [%u ms], context state %s [%s %s]",
>  			 delay_ms ? "delayed " : "",
>  			 tcpm_states[port->state], tcpm_states[state],
> -			 delay_ms, tcpm_states[port->enter_state]);
> +			 delay_ms, tcpm_states[port->enter_state],
> +			 pd_rev[port->negotiated_rev], tcpm_ams_str[port->ams]);
>  }
>  
>  static void tcpm_queue_message(struct tcpm_port *port,
> @@ -1044,6 +1156,149 @@ static void tcpm_queue_message(struct tcpm_port *port,
>  	mod_tcpm_delayed_work(port, 0);
>  }
>  
> +static bool tcpm_vdm_ams(struct tcpm_port *port)
> +{
> +	switch (port->ams) {
> +	case DISCOVER_IDENTITY:
> +	case SOURCE_STARTUP_CABLE_PLUG_DISCOVER_IDENTITY:
> +	case DISCOVER_SVIDS:
> +	case DISCOVER_MODES:
> +	case DFP_TO_UFP_ENTER_MODE:
> +	case DFP_TO_UFP_EXIT_MODE:
> +	case DFP_TO_CABLE_PLUG_ENTER_MODE:
> +	case DFP_TO_CABLE_PLUG_EXIT_MODE:
> +	case ATTENTION:
> +	case UNSTRUCTURED_VDMS:
> +	case STRUCTURED_VDMS:
> +		break;
> +	default:
> +		return false;
> +	}
> +
> +	return true;
> +}
> +
> +static bool tcpm_ams_interruptible(struct tcpm_port *port)
> +{
> +	switch (port->ams) {
> +	/* Interruptible AMS */
> +	case NONE_AMS:
> +	case SECURITY:
> +	case FIRMWARE_UPDATE:
> +	case DISCOVER_IDENTITY:
> +	case SOURCE_STARTUP_CABLE_PLUG_DISCOVER_IDENTITY:
> +	case DISCOVER_SVIDS:
> +	case DISCOVER_MODES:
> +	case DFP_TO_UFP_ENTER_MODE:
> +	case DFP_TO_UFP_EXIT_MODE:
> +	case DFP_TO_CABLE_PLUG_ENTER_MODE:
> +	case DFP_TO_CABLE_PLUG_EXIT_MODE:
> +	case UNSTRUCTURED_VDMS:
> +	case STRUCTURED_VDMS:
> +	case COUNTRY_INFO:
> +	case COUNTRY_CODES:
> +		break;
> +	/* Non-Interruptible AMS */
> +	default:
> +		if (port->in_ams)
> +			return false;
> +		break;
> +	}
> +
> +	return true;
> +}
> +
> +static int tcpm_ams_start(struct tcpm_port *port, enum tcpm_ams ams)
> +{
> +	int ret = 0;
> +
> +	tcpm_log(port, "AMS %s start", tcpm_ams_str[ams]);
> +
> +	if (!tcpm_ams_interruptible(port) && ams != HARD_RESET) {
> +		port->upcoming_state = INVALID_STATE;
> +		tcpm_log(port, "AMS %s not interruptible, aborting",
> +			 tcpm_ams_str[port->ams]);
> +		return -EAGAIN;
> +	}
> +
> +	if (port->pwr_role == TYPEC_SOURCE) {
> +		enum typec_cc_status cc_req = port->cc_req;
> +
> +		port->ams = ams;
> +
> +		if (ams == HARD_RESET) {
> +			tcpm_set_cc(port, tcpm_rp_cc(port));
> +			tcpm_pd_transmit(port, TCPC_TX_HARD_RESET, NULL);
> +			tcpm_set_state(port, HARD_RESET_START, 0);
> +			return ret;
> +		} else if (ams == SOFT_RESET_AMS) {
> +			if (!port->explicit_contract) {
> +				port->upcoming_state = INVALID_STATE;
> +				tcpm_set_cc(port, tcpm_rp_cc(port));
> +				return ret;
> +			}
> +		} else if (tcpm_vdm_ams(port)) {
> +			/* tSinkTx is enforced in vdm_run_state_machine */
> +			if (port->negotiated_rev >= PD_REV30)
> +				tcpm_set_cc(port, SINK_TX_NG);
> +			return ret;
> +		}
> +
> +		if (port->negotiated_rev >= PD_REV30)
> +			tcpm_set_cc(port, SINK_TX_NG);
> +
> +		switch (port->state) {
> +		case SRC_READY:
> +		case SRC_STARTUP:
> +		case SRC_SOFT_RESET_WAIT_SNK_TX:
> +		case SOFT_RESET:
> +		case SOFT_RESET_SEND:
> +			if (port->negotiated_rev >= PD_REV30)
> +				tcpm_set_state(port, AMS_START,
> +					       cc_req == SINK_TX_OK ?
> +					       PD_T_SINK_TX : 0);
> +			else
> +				tcpm_set_state(port, AMS_START, 0);
> +			break;
> +		default:
> +			if (port->negotiated_rev >= PD_REV30)
> +				tcpm_set_state(port, SRC_READY,
> +					       cc_req == SINK_TX_OK ?
> +					       PD_T_SINK_TX : 0);
> +			else
> +				tcpm_set_state(port, SRC_READY, 0);
> +			break;
> +		}
> +	} else {
> +		if (port->negotiated_rev >= PD_REV30 &&
> +		    !tcpm_sink_tx_ok(port) &&
> +		    ams != SOFT_RESET_AMS &&
> +		    ams != HARD_RESET) {
> +			port->upcoming_state = INVALID_STATE;
> +			tcpm_log(port, "Sink TX No Go");
> +			return -EAGAIN;
> +		}
> +
> +		port->ams = ams;
> +
> +		if (ams == HARD_RESET) {
> +			tcpm_pd_transmit(port, TCPC_TX_HARD_RESET, NULL);
> +			tcpm_set_state(port, HARD_RESET_START, 0);
> +			return ret;
> +		} else if (tcpm_vdm_ams(port)) {
> +			return ret;
> +		}
> +
> +		if (port->state == SNK_READY ||
> +		    port->state == SNK_SOFT_RESET)
> +			tcpm_set_state(port, AMS_START, 0);
> +		else
> +			tcpm_set_state(port, SNK_READY, 0);
> +	}
> +
> +	return ret;
> +}
> +
>  /*
>   * VDM/VDO handling functions
>   */
> @@ -1236,6 +1491,8 @@ static int tcpm_pd_svdm(struct tcpm_port *port, struct typec_altmode *adev,
>  		if (IS_ERR_OR_NULL(port->partner))
>  			break;
>  
> +		tcpm_ams_finish(port);
> +
>  		switch (cmd) {
>  		case CMD_DISCOVER_IDENT:
>  			/* 6.4.4.3.1 */
> @@ -1286,6 +1543,7 @@ static int tcpm_pd_svdm(struct tcpm_port *port, struct typec_altmode *adev,
>  		}
>  		break;
>  	case CMDT_RSP_NAK:
> +		tcpm_ams_finish(port);
>  		switch (cmd) {
>  		case CMD_ENTER_MODE:
>  			/* Back to USB Operation */
> @@ -1435,7 +1693,8 @@ static unsigned int vdm_ready_timeout(u32 vdm_hdr)
>  static void vdm_run_state_machine(struct tcpm_port *port)
>  {
>  	struct pd_message msg;
> -	int i, res;
> +	int i, res = 0;
> +	u32 vdo_hdr = port->vdo_data[0];
>  
>  	switch (port->vdm_state) {
>  	case VDM_STATE_READY:
> @@ -1452,26 +1711,47 @@ static void vdm_run_state_machine(struct tcpm_port *port)
>  		if (port->state != SRC_READY && port->state != SNK_READY)
>  			break;
>  
> -		/* Prepare and send VDM */
> -		memset(&msg, 0, sizeof(msg));
> -		msg.header = PD_HEADER_LE(PD_DATA_VENDOR_DEF,
> -					  port->pwr_role,
> -					  port->data_role,
> -					  port->negotiated_rev,
> -					  port->message_id, port->vdo_count);
> -		for (i = 0; i < port->vdo_count; i++)
> -			msg.payload[i] = cpu_to_le32(port->vdo_data[i]);
> -		res = tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
> -		if (res < 0) {
> -			port->vdm_state = VDM_STATE_ERR_SEND;
> -		} else {
> -			unsigned long timeout;
> +		/* TODO: AMS operation for Unstructured VDM */
> +		if (PD_VDO_SVDM(vdo_hdr) && PD_VDO_CMDT(vdo_hdr) == CMDT_INIT) {
> +			switch (PD_VDO_CMD(vdo_hdr)) {
> +			case CMD_DISCOVER_IDENT:
> +				res = tcpm_ams_start(port, DISCOVER_IDENTITY);
> +				break;
> +			case CMD_DISCOVER_SVID:
> +				res = tcpm_ams_start(port, DISCOVER_SVIDS);
> +				break;
> +			case CMD_DISCOVER_MODES:
> +				res = tcpm_ams_start(port, DISCOVER_MODES);
> +				break;
> +			case CMD_ENTER_MODE:
> +				res = tcpm_ams_start(port,
> +						     DFP_TO_UFP_ENTER_MODE);

One line is enough:

				res = tcpm_ams_start(port, DFP_TO_UFP_ENTER_MODE);

> +				break;
> +			case CMD_EXIT_MODE:
> +				res = tcpm_ams_start(port,
> +						     DFP_TO_UFP_EXIT_MODE);

Ditto.

> +				break;
> +			case CMD_ATTENTION:
> +				res = tcpm_ams_start(port, ATTENTION);
> +				break;
> +			case VDO_CMD_VENDOR(0) ... VDO_CMD_VENDOR(15):
> +				res = tcpm_ams_start(port, STRUCTURED_VDMS);
> +				break;
> +			default:
> +				res = -EOPNOTSUPP;
> +				break;
> +			}
>  
> -			port->vdm_retries = 0;
> -			port->vdm_state = VDM_STATE_BUSY;
> -			timeout = vdm_ready_timeout(port->vdo_data[0]);
> -			mod_vdm_delayed_work(port, timeout);
> +			if (res < 0)
> +				return;
>  		}
> +
> +		port->vdm_state = VDM_STATE_SEND_MESSAGE;
> +		mod_vdm_delayed_work(port, (port->negotiated_rev >= PD_REV30) &&
> +					   (port->pwr_role == TYPEC_SOURCE) &&
> +					   (PD_VDO_SVDM(vdo_hdr)) &&
> +					   (PD_VDO_CMDT(vdo_hdr) == CMDT_INIT) ?
> +					   PD_T_SINK_TX : 0);

I don't think you need all those brackets. This would look better, and
I bet it would make also scripts/checkpatch.pl happy:

                mod_vdm_delayed_work(port, (port->negotiated_rev >= PD_REV30 &&
                                            port->pwr_role == TYPEC_SOURCE &&
                                            PD_VDO_SVDM(vdo_hdr) &&
                                            PD_VDO_CMDT(vdo_hdr) == CMDT_INIT) ?
                                           PD_T_SINK_TX : 0);

>  		break;
>  	case VDM_STATE_WAIT_RSP_BUSY:
>  		port->vdo_data[0] = port->vdo_retry;
> @@ -1480,6 +1760,8 @@ static void vdm_run_state_machine(struct tcpm_port *port)
>  		break;
>  	case VDM_STATE_BUSY:
>  		port->vdm_state = VDM_STATE_ERR_TMOUT;
> +		if (port->ams != NONE_AMS)
> +			tcpm_ams_finish(port);
>  		break;
>  	case VDM_STATE_ERR_SEND:
>  		/*
> @@ -1492,6 +1774,29 @@ static void vdm_run_state_machine(struct tcpm_port *port)
>  			tcpm_log(port, "VDM Tx error, retry");
>  			port->vdm_retries++;
>  			port->vdm_state = VDM_STATE_READY;
> +			tcpm_ams_finish(port);
> +		}
> +		break;
> +	case VDM_STATE_SEND_MESSAGE:
> +		/* Prepare and send VDM */
> +		memset(&msg, 0, sizeof(msg));
> +		msg.header = PD_HEADER_LE(PD_DATA_VENDOR_DEF,
> +					  port->pwr_role,
> +					  port->data_role,
> +					  port->negotiated_rev,
> +					  port->message_id, port->vdo_count);
> +		for (i = 0; i < port->vdo_count; i++)
> +			msg.payload[i] = cpu_to_le32(port->vdo_data[i]);
> +		res = tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
> +		if (res < 0) {
> +			port->vdm_state = VDM_STATE_ERR_SEND;
> +		} else {
> +			unsigned long timeout;
> +
> +			port->vdm_retries = 0;
> +			port->vdm_state = VDM_STATE_BUSY;
> +			timeout = vdm_ready_timeout(vdo_hdr);
> +			mod_vdm_delayed_work(port, timeout);
>  		}
>  		break;
>  	default:
> @@ -1514,7 +1819,8 @@ static void vdm_state_machine_work(struct kthread_work *work)
>  		prev_state = port->vdm_state;
>  		vdm_run_state_machine(port);
>  	} while (port->vdm_state != prev_state &&
> -		 port->vdm_state != VDM_STATE_BUSY);
> +		 port->vdm_state != VDM_STATE_BUSY &&
> +		 port->vdm_state != VDM_STATE_SEND_MESSAGE);
>  
>  	mutex_unlock(&port->lock);
>  }
> @@ -1997,11 +2303,14 @@ static void tcpm_pd_ctrl_request(struct tcpm_port *port,
>  		case SOFT_RESET_SEND:
>  			port->message_id = 0;
>  			port->rx_msgid = -1;
> -			if (port->pwr_role == TYPEC_SOURCE)
> -				next_state = SRC_SEND_CAPABILITIES;
> -			else
> -				next_state = SNK_WAIT_CAPABILITIES;
> -			tcpm_set_state(port, next_state, 0);
> +			if (port->ams == SOFT_RESET_AMS)
> +				tcpm_ams_finish(port);
> +			if (port->pwr_role == TYPEC_SOURCE) {
> +				port->upcoming_state = SRC_SEND_CAPABILITIES;
> +				tcpm_ams_start(port, POWER_NEGOTIATION);
> +			} else {
> +				tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
> +			}
>  			break;
>  		case DR_SWAP_SEND:
>  			tcpm_set_state(port, DR_SWAP_CHANGE_DR, 0);
> @@ -2776,13 +3085,6 @@ static bool tcpm_start_toggling(struct tcpm_port *port, enum typec_cc_status cc)
>  	return ret == 0;
>  }
>  
> -static void tcpm_set_cc(struct tcpm_port *port, enum typec_cc_status cc)
> -{
> -	tcpm_log(port, "cc:=%d", cc);
> -	port->cc_req = cc;
> -	port->tcpc->set_cc(port->tcpc, cc);
> -}
> -
>  static int tcpm_init_vbus(struct tcpm_port *port)
>  {
>  	int ret;
> @@ -2912,6 +3214,8 @@ static void tcpm_reset_port(struct tcpm_port *port)
>  		ret = port->tcpc->enable_auto_vbus_discharge(port->tcpc, false);
>  		tcpm_log_force(port, "Disable vbus discharge ret:%d", ret);
>  	}
> +	port->in_ams = false;
> +	port->ams = NONE_AMS;
>  	tcpm_unregister_altmodes(port);
>  	tcpm_typec_disconnect(port);
>  	port->attached = false;
> @@ -3090,6 +3394,7 @@ static void run_state_machine(struct tcpm_port *port)
>  	int ret;
>  	enum typec_pwr_opmode opmode;
>  	unsigned int msecs;
> +	enum tcpm_state upcoming_state;
>  
>  	port->enter_state = port->state;
>  	switch (port->state) {
> @@ -3190,7 +3495,12 @@ static void run_state_machine(struct tcpm_port *port)
>  		port->message_id = 0;
>  		port->rx_msgid = -1;
>  		port->explicit_contract = false;
> -		tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
> +		/* SNK -> SRC POWER/FAST_ROLE_SWAP finished */
> +		if (port->ams == POWER_ROLE_SWAP ||
> +		    port->ams == FAST_ROLE_SWAP)
> +			tcpm_ams_finish(port);
> +		port->upcoming_state = SRC_SEND_CAPABILITIES;
> +		tcpm_ams_start(port, POWER_NEGOTIATION);
>  		break;
>  	case SRC_SEND_CAPABILITIES:
>  		port->caps_count++;
> @@ -3272,6 +3582,19 @@ static void run_state_machine(struct tcpm_port *port)
>  		tcpm_swap_complete(port, 0);
>  		tcpm_typec_connect(port);
>  
> +		if (port->ams != NONE_AMS)
> +			tcpm_ams_finish(port);
> +		/*
> +		 * If previous AMS is interrupted, switch to the upcoming
> +		 * state.
> +		 */
> +		upcoming_state = port->upcoming_state;
> +		if (port->upcoming_state != INVALID_STATE) {
> +			port->upcoming_state = INVALID_STATE;
> +			tcpm_set_state(port, upcoming_state, 0);
> +			break;
> +		}

I don't see the local upcoming_state variable is being used anywhere
outside of these conditions, so please set it inside the condition
block:

		if (port->upcoming_state != INVALID_STATE) {
		        upcoming_state = port->upcoming_state;
			port->upcoming_state = INVALID_STATE;
			tcpm_set_state(port, upcoming_state, 0);
			break;
		}

>  		tcpm_check_send_discover(port);
>  		/*
>  		 * 6.3.5
> @@ -3389,6 +3712,12 @@ static void run_state_machine(struct tcpm_port *port)
>  		port->message_id = 0;
>  		port->rx_msgid = -1;
>  		port->explicit_contract = false;
> +
> +		if (port->ams == POWER_ROLE_SWAP ||
> +		    port->ams == FAST_ROLE_SWAP)
> +			/* SRC -> SNK POWER/FAST_ROLE_SWAP finished */
> +			tcpm_ams_finish(port);
> +
>  		tcpm_set_state(port, SNK_DISCOVERY, 0);
>  		break;
>  	case SNK_DISCOVERY:
> @@ -3437,7 +3766,7 @@ static void run_state_machine(struct tcpm_port *port)
>  		 */
>  		if (port->vbus_never_low) {
>  			port->vbus_never_low = false;
> -			tcpm_set_state(port, SOFT_RESET_SEND,
> +			tcpm_set_state(port, SNK_SOFT_RESET,
>  				       PD_T_SINK_WAIT_CAP);
>  		} else {
>  			tcpm_set_state(port, hard_reset_state(port),
> @@ -3490,9 +3819,23 @@ static void run_state_machine(struct tcpm_port *port)
>  
>  		tcpm_swap_complete(port, 0);
>  		tcpm_typec_connect(port);
> -		tcpm_check_send_discover(port);
>  		mod_enable_frs_delayed_work(port, 0);
>  		tcpm_pps_complete(port, port->pps_status);
> +
> +		if (port->ams != NONE_AMS)
> +			tcpm_ams_finish(port);
> +		/*
> +		 * If previous AMS is interrupted, switch to the upcoming
> +		 * state.
> +		 */
> +		upcoming_state = port->upcoming_state;
> +		if (port->upcoming_state != INVALID_STATE) {
> +			port->upcoming_state = INVALID_STATE;
> +			tcpm_set_state(port, upcoming_state, 0);
> +			break;
> +		}

Same here.

> +		tcpm_check_send_discover(port);
>  		power_supply_changed(port->psy);
>  		break;
>  
> @@ -3513,8 +3856,14 @@ static void run_state_machine(struct tcpm_port *port)
>  
>  	/* Hard_Reset states */
>  	case HARD_RESET_SEND:
> -		tcpm_pd_transmit(port, TCPC_TX_HARD_RESET, NULL);
> -		tcpm_set_state(port, HARD_RESET_START, 0);
> +		if (port->ams != NONE_AMS)
> +			tcpm_ams_finish(port);
> +		/*
> +		 * State machine will be directed to HARD_RESET_START,
> +		 * thus set upcoming_state to INVALID_STATE.
> +		 */
> +		port->upcoming_state = INVALID_STATE;
> +		tcpm_ams_start(port, HARD_RESET);
>  		break;
>  	case HARD_RESET_START:
>  		port->sink_cap_done = false;
> @@ -3558,6 +3907,8 @@ static void run_state_machine(struct tcpm_port *port)
>  	case SRC_HARD_RESET_VBUS_ON:
>  		tcpm_set_vconn(port, true);
>  		tcpm_set_vbus(port, true);
> +		if (port->ams == HARD_RESET)
> +			tcpm_ams_finish(port);
>  		port->tcpc->set_pd_rx(port->tcpc, true);
>  		tcpm_set_attached_state(port, true);
>  		tcpm_set_state(port, SRC_UNATTACHED, PD_T_PS_SOURCE_ON);
> @@ -3579,6 +3930,8 @@ static void run_state_machine(struct tcpm_port *port)
>  		tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, PD_T_SAFE_0V);
>  		break;
>  	case SNK_HARD_RESET_WAIT_VBUS:
> +		if (port->ams == HARD_RESET)
> +			tcpm_ams_finish(port);
>  		/* Assume we're disconnected if VBUS doesn't come back. */
>  		tcpm_set_state(port, SNK_UNATTACHED,
>  			       PD_T_SRC_RECOVER_MAX + PD_T_SRC_TURN_ON);
> @@ -3606,6 +3959,8 @@ static void run_state_machine(struct tcpm_port *port)
>  					       5000);
>  			tcpm_set_charge(port, true);
>  		}
> +		if (port->ams == HARD_RESET)
> +			tcpm_ams_finish(port);
>  		tcpm_set_attached_state(port, true);
>  		tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, VSAFE5V);
>  		tcpm_set_state(port, SNK_STARTUP, 0);
> @@ -3616,10 +3971,19 @@ static void run_state_machine(struct tcpm_port *port)
>  		port->message_id = 0;
>  		port->rx_msgid = -1;
>  		tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
> -		if (port->pwr_role == TYPEC_SOURCE)
> -			tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
> -		else
> +		if (port->pwr_role == TYPEC_SOURCE) {
> +			port->upcoming_state = SRC_SEND_CAPABILITIES;
> +			tcpm_ams_start(port, POWER_NEGOTIATION);
> +		} else {
>  			tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
> +		}
> +		break;
> +	case SRC_SOFT_RESET_WAIT_SNK_TX:
> +	case SNK_SOFT_RESET:
> +		if (port->ams != NONE_AMS)
> +			tcpm_ams_finish(port);
> +		port->upcoming_state = SOFT_RESET_SEND;
> +		tcpm_ams_start(port, SOFT_RESET_AMS);
>  		break;
>  	case SOFT_RESET_SEND:
>  		port->message_id = 0;
> @@ -3886,6 +4250,19 @@ static void run_state_machine(struct tcpm_port *port)
>  			       tcpm_default_state(port),
>  			       port->vbus_present ? PD_T_PS_SOURCE_OFF : 0);
>  		break;
> +
> +	/* AMS intermediate state */
> +	case AMS_START:
> +		if (port->upcoming_state == INVALID_STATE) {
> +			tcpm_set_state(port, port->pwr_role == TYPEC_SOURCE ?
> +				       SRC_READY : SNK_READY, 0);
> +			break;
> +		}
> +
> +		upcoming_state = port->upcoming_state;
> +		port->upcoming_state = INVALID_STATE;
> +		tcpm_set_state(port, upcoming_state, 0);
> +		break;
>  	default:
>  		WARN(1, "Unexpected port state %d\n", port->state);
>  		break;
> @@ -4313,6 +4690,8 @@ static void _tcpm_pd_hard_reset(struct tcpm_port *port)
>  	if (port->bist_request == BDO_MODE_TESTDATA && port->tcpc->set_bist_data)
>  		port->tcpc->set_bist_data(port->tcpc, false);
>  
> +	if (port->ams != NONE_AMS)
> +		port->ams = NONE_AMS;
>  	/*
>  	 * If we keep receiving hard reset requests, executing the hard reset
>  	 * must have failed. Revert to error recovery if that happens.
> @@ -4501,7 +4880,12 @@ static int tcpm_dr_set(struct typec_port *p, enum typec_data_role data)
>  		port->non_pd_role_swap = true;
>  		tcpm_set_state(port, PORT_RESET, 0);
>  	} else {
> -		tcpm_set_state(port, DR_SWAP_SEND, 0);
> +		port->upcoming_state = DR_SWAP_SEND;
> +		ret = tcpm_ams_start(port, DATA_ROLE_SWAP);
> +		if (ret == -EAGAIN) {
> +			port->upcoming_state = INVALID_STATE;
> +			goto port_unlock;
> +		}
>  	}
>  
>  	port->swap_status = 0;
> @@ -4547,10 +4931,16 @@ static int tcpm_pr_set(struct typec_port *p, enum typec_role role)
>  		goto port_unlock;
>  	}
>  
> +	port->upcoming_state = PR_SWAP_SEND;
> +	ret = tcpm_ams_start(port, POWER_ROLE_SWAP);
> +	if (ret == -EAGAIN) {
> +		port->upcoming_state = INVALID_STATE;
> +		goto port_unlock;
> +	}
> +
>  	port->swap_status = 0;
>  	port->swap_pending = true;
>  	reinit_completion(&port->swap_complete);
> -	tcpm_set_state(port, PR_SWAP_SEND, 0);
>  	mutex_unlock(&port->lock);
>  
>  	if (!wait_for_completion_timeout(&port->swap_complete,
> @@ -4586,10 +4976,16 @@ static int tcpm_vconn_set(struct typec_port *p, enum typec_role role)
>  		goto port_unlock;
>  	}
>  
> +	port->upcoming_state = VCONN_SWAP_SEND;
> +	ret = tcpm_ams_start(port, VCONN_SWAP);
> +	if (ret == -EAGAIN) {
> +		port->upcoming_state = INVALID_STATE;
> +		goto port_unlock;
> +	}
> +
>  	port->swap_status = 0;
>  	port->swap_pending = true;
>  	reinit_completion(&port->swap_complete);
> -	tcpm_set_state(port, VCONN_SWAP_SEND, 0);
>  	mutex_unlock(&port->lock);
>  
>  	if (!wait_for_completion_timeout(&port->swap_complete,
> @@ -4654,6 +5050,13 @@ static int tcpm_pps_set_op_curr(struct tcpm_port *port, u16 op_curr)
>  		goto port_unlock;
>  	}
>  
> +	port->upcoming_state = SNK_NEGOTIATE_PPS_CAPABILITIES;
> +	ret = tcpm_ams_start(port, POWER_NEGOTIATION);
> +	if (ret == -EAGAIN) {
> +		port->upcoming_state = INVALID_STATE;
> +		goto port_unlock;
> +	}
> +
>  	/* Round down operating current to align with PPS valid steps */
>  	op_curr = op_curr - (op_curr % RDO_PROG_CURR_MA_STEP);
>  
> @@ -4661,7 +5064,6 @@ static int tcpm_pps_set_op_curr(struct tcpm_port *port, u16 op_curr)
>  	port->pps_data.op_curr = op_curr;
>  	port->pps_status = 0;
>  	port->pps_pending = true;
> -	tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0);
>  	mutex_unlock(&port->lock);
>  
>  	if (!wait_for_completion_timeout(&port->pps_complete,
> @@ -4710,6 +5112,13 @@ static int tcpm_pps_set_out_volt(struct tcpm_port *port, u16 out_volt)
>  		goto port_unlock;
>  	}
>  
> +	port->upcoming_state = SNK_NEGOTIATE_PPS_CAPABILITIES;
> +	ret = tcpm_ams_start(port, POWER_NEGOTIATION);
> +	if (ret == -EAGAIN) {
> +		port->upcoming_state = INVALID_STATE;
> +		goto port_unlock;
> +	}
> +
>  	/* Round down output voltage to align with PPS valid steps */
>  	out_volt = out_volt - (out_volt % RDO_PROG_VOLT_MV_STEP);
>  
> @@ -4717,7 +5126,6 @@ static int tcpm_pps_set_out_volt(struct tcpm_port *port, u16 out_volt)
>  	port->pps_data.out_volt = out_volt;
>  	port->pps_status = 0;
>  	port->pps_pending = true;
> -	tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0);
>  	mutex_unlock(&port->lock);
>  
>  	if (!wait_for_completion_timeout(&port->pps_complete,
> @@ -4757,6 +5165,16 @@ static int tcpm_pps_activate(struct tcpm_port *port, bool activate)
>  		goto port_unlock;
>  	}
>  
> +	if (activate)
> +		port->upcoming_state = SNK_NEGOTIATE_PPS_CAPABILITIES;
> +	else
> +		port->upcoming_state = SNK_NEGOTIATE_CAPABILITIES;
> +	ret = tcpm_ams_start(port, POWER_NEGOTIATION);
> +	if (ret == -EAGAIN) {
> +		port->upcoming_state = INVALID_STATE;
> +		goto port_unlock;
> +	}
> +
>  	reinit_completion(&port->pps_complete);
>  	port->pps_status = 0;
>  	port->pps_pending = true;
> @@ -4765,9 +5183,6 @@ static int tcpm_pps_activate(struct tcpm_port *port, bool activate)
>  	if (activate) {
>  		port->pps_data.out_volt = port->supply_voltage;
>  		port->pps_data.op_curr = port->current_limit;
> -		tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0);
> -	} else {
> -		tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
>  	}
>  	mutex_unlock(&port->lock);
>  
> diff --git a/include/linux/usb/pd.h b/include/linux/usb/pd.h
> index bb9a782e1411..79599b90ba55 100644
> --- a/include/linux/usb/pd.h
> +++ b/include/linux/usb/pd.h
> @@ -479,6 +479,7 @@ static inline unsigned int rdo_max_power(u32 rdo)
>  #define PD_T_NEWSRC		250	/* Maximum of 275ms */
>  #define PD_T_SWAP_SRC_START	20	/* Minimum of 20ms */
>  #define PD_T_BIST_CONT_MODE	50	/* 30 - 60 ms */
> +#define PD_T_SINK_TX		16	/* 16 - 20 ms */
>  
>  #define PD_T_DRP_TRY		100	/* 75 - 150 ms */
>  #define PD_T_DRP_TRYWAIT	600	/* 400 - 800 ms */
> diff --git a/include/linux/usb/tcpm.h b/include/linux/usb/tcpm.h
> index f4a18427f5c4..3af99f85e8b9 100644
> --- a/include/linux/usb/tcpm.h
> +++ b/include/linux/usb/tcpm.h
> @@ -19,6 +19,10 @@ enum typec_cc_status {
>  	TYPEC_CC_RP_3_0,
>  };
>  
> +/* Collision Avoidance */
> +#define SINK_TX_NG	TYPEC_CC_RP_1_5
> +#define SINK_TX_OK	TYPEC_CC_RP_3_0
> +
>  enum typec_cc_polarity {
>  	TYPEC_POLARITY_CC1,
>  	TYPEC_POLARITY_CC2,
> -- 
> 2.29.2.729.g45daf8777d-goog

thanks,

Badhri Jagan Sridharan Jan. 13, 2021, 6:10 a.m. UTC | #2

Hi Kyle,

Do you want to handle the FAST_ROLE_SWAP case as well ?

You would have to fix up in two places:

#1
-                       if (port->state == SNK_READY)
-                               tcpm_set_state(port, FR_SWAP_SEND, 0);
-                       else
+                       if (port->state == SNK_READY) {
+                               int ret;
+
+                               port->upcoming_state = FR_SWAP_SEND;
+                               ret = tcpm_ams_start(port, FAST_ROLE_SWAP);
+                               if (ret == -EAGAIN)
+                                       port->upcoming_state = INVALID_STATE;
+                       } else {
                                tcpm_log(port, "Discarding FRS_SIGNAL!
Not in sink ready");
+                       }

#2
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -4449,9 +4449,14 @@ static void tcpm_enable_frs_work(struct
kthread_work *work)
        if (port->state != SNK_READY || port->vdm_state !=
VDM_STATE_DONE || port->send_discover)
                goto resched;

-       tcpm_set_state(port, GET_SINK_CAP, 0);
-       port->sink_cap_done = true;
-
+       port->upcoming_state = GET_SINK_CAP;
+       ret = tcpm_ams_start(port, GET_SINK_CAPABILITIES);
+       if (ret == -EAGAIN) {
+               port->upcoming_state = INVALID_STATE;
+       } else {
+               port->sink_cap_done = true;
+               goto unlock;
+       }

Thanks,
Badhri


On Tue, Jan 12, 2021 at 5:29 AM Heikki Krogerus
<heikki.krogerus@linux.intel.com> wrote:
>
> On Wed, Jan 06, 2021 at 12:39:25AM +0800, Kyle Tso wrote:
> > This patch provides the implementation of Collision Avoidance introduced
> > in PD3.0. The start of each Atomic Message Sequence (AMS) initiated by
> > the port will be denied if the current AMS is not interruptible. The
> > Source port will set the CC to SinkTxNG if it is going to initiate an
> > AMS, and SinkTxOk otherwise. Meanwhile, any AMS initiated by a Sink port
> > will be denied in TCPM if the port partner (Source) sets SinkTxNG except
> > for HARD_RESET and SOFT_RESET.
> >
> > Signed-off-by: Kyle Tso <kyletso@google.com>
> > Signed-off-by: Will McVicker <willmcvicker@google.com>
>
> So did you and Will develop this patch together?
>
> Few nitpicks below.
>
> > ---
> > Changelog since v4:
> >  - rebased to ToT
> >
> >  drivers/usb/typec/tcpm/tcpm.c | 533 ++++++++++++++++++++++++++++++----
> >  include/linux/usb/pd.h        |   1 +
> >  include/linux/usb/tcpm.h      |   4 +
> >  3 files changed, 479 insertions(+), 59 deletions(-)
> >
> > diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> > index 22a85b396f69..9fb3ec176f42 100644
> > --- a/drivers/usb/typec/tcpm/tcpm.c
> > +++ b/drivers/usb/typec/tcpm/tcpm.c
> > @@ -76,6 +76,8 @@
> >       S(SNK_HARD_RESET_SINK_ON),              \
> >                                               \
> >       S(SOFT_RESET),                          \
> > +     S(SRC_SOFT_RESET_WAIT_SNK_TX),          \
> > +     S(SNK_SOFT_RESET),                      \
> >       S(SOFT_RESET_SEND),                     \
> >                                               \
> >       S(DR_SWAP_ACCEPT),                      \
> > @@ -139,7 +141,45 @@
> >                                               \
> >       S(ERROR_RECOVERY),                      \
> >       S(PORT_RESET),                          \
> > -     S(PORT_RESET_WAIT_OFF)
> > +     S(PORT_RESET_WAIT_OFF),                 \
> > +                                             \
> > +     S(AMS_START)
> > +
> > +#define FOREACH_AMS(S)                               \
> > +     S(NONE_AMS),                            \
> > +     S(POWER_NEGOTIATION),                   \
> > +     S(GOTOMIN),                             \
> > +     S(SOFT_RESET_AMS),                      \
> > +     S(HARD_RESET),                          \
> > +     S(CABLE_RESET),                         \
> > +     S(GET_SOURCE_CAPABILITIES),             \
> > +     S(GET_SINK_CAPABILITIES),               \
> > +     S(POWER_ROLE_SWAP),                     \
> > +     S(FAST_ROLE_SWAP),                      \
> > +     S(DATA_ROLE_SWAP),                      \
> > +     S(VCONN_SWAP),                          \
> > +     S(SOURCE_ALERT),                        \
> > +     S(GETTING_SOURCE_EXTENDED_CAPABILITIES),\
> > +     S(GETTING_SOURCE_SINK_STATUS),          \
> > +     S(GETTING_BATTERY_CAPABILITIES),        \
> > +     S(GETTING_BATTERY_STATUS),              \
> > +     S(GETTING_MANUFACTURER_INFORMATION),    \
> > +     S(SECURITY),                            \
> > +     S(FIRMWARE_UPDATE),                     \
> > +     S(DISCOVER_IDENTITY),                   \
> > +     S(SOURCE_STARTUP_CABLE_PLUG_DISCOVER_IDENTITY), \
> > +     S(DISCOVER_SVIDS),                      \
> > +     S(DISCOVER_MODES),                      \
> > +     S(DFP_TO_UFP_ENTER_MODE),               \
> > +     S(DFP_TO_UFP_EXIT_MODE),                \
> > +     S(DFP_TO_CABLE_PLUG_ENTER_MODE),        \
> > +     S(DFP_TO_CABLE_PLUG_EXIT_MODE),         \
> > +     S(ATTENTION),                           \
> > +     S(BIST),                                \
> > +     S(UNSTRUCTURED_VDMS),                   \
> > +     S(STRUCTURED_VDMS),                     \
> > +     S(COUNTRY_INFO),                        \
> > +     S(COUNTRY_CODES)
> >
> >  #define GENERATE_ENUM(e)     e
> >  #define GENERATE_STRING(s)   #s
> > @@ -152,6 +192,14 @@ static const char * const tcpm_states[] = {
> >       FOREACH_STATE(GENERATE_STRING)
> >  };
> >
> > +enum tcpm_ams {
> > +     FOREACH_AMS(GENERATE_ENUM)
> > +};
> > +
> > +static const char * const tcpm_ams_str[] = {
> > +     FOREACH_AMS(GENERATE_STRING)
> > +};
> > +
> >  enum vdm_states {
> >       VDM_STATE_ERR_BUSY = -3,
> >       VDM_STATE_ERR_SEND = -2,
> > @@ -161,6 +209,7 @@ enum vdm_states {
> >       VDM_STATE_READY = 1,
> >       VDM_STATE_BUSY = 2,
> >       VDM_STATE_WAIT_RSP_BUSY = 3,
> > +     VDM_STATE_SEND_MESSAGE = 4,
> >  };
> >
> >  enum pd_msg_request {
> > @@ -381,6 +430,11 @@ struct tcpm_port {
> >       /* Sink caps have been queried */
> >       bool sink_cap_done;
> >
> > +     /* Collision Avoidance and Atomic Message Sequence */
> > +     enum tcpm_state upcoming_state;
> > +     enum tcpm_ams ams;
> > +     bool in_ams;
> > +
> >  #ifdef CONFIG_DEBUG_FS
> >       struct dentry *dentry;
> >       struct mutex logbuffer_lock;    /* log buffer access lock */
> > @@ -396,6 +450,12 @@ struct pd_rx_event {
> >       struct pd_message msg;
> >  };
> >
> > +static const char * const pd_rev[] = {
> > +     [PD_REV10]              = "rev1",
> > +     [PD_REV20]              = "rev2",
> > +     [PD_REV30]              = "rev3",
> > +};
> > +
> >  #define tcpm_cc_is_sink(cc) \
> >       ((cc) == TYPEC_CC_RP_DEF || (cc) == TYPEC_CC_RP_1_5 || \
> >        (cc) == TYPEC_CC_RP_3_0)
> > @@ -440,6 +500,10 @@ struct pd_rx_event {
> >       ((port)->typec_caps.data == TYPEC_PORT_DFP ? \
> >       TYPEC_HOST : TYPEC_DEVICE)
> >
> > +#define tcpm_sink_tx_ok(port) \
> > +     (tcpm_port_is_sink(port) && \
> > +     ((port)->cc1 == TYPEC_CC_RP_3_0 || (port)->cc2 == TYPEC_CC_RP_3_0))
> > +
> >  static enum tcpm_state tcpm_default_state(struct tcpm_port *port)
> >  {
> >       if (port->port_type == TYPEC_PORT_DRP) {
> > @@ -666,6 +730,35 @@ static void tcpm_debugfs_exit(const struct tcpm_port *port) { }
> >
> >  #endif
> >
> > +static void tcpm_set_cc(struct tcpm_port *port, enum typec_cc_status cc)
> > +{
> > +     tcpm_log(port, "cc:=%d", cc);
> > +     port->cc_req = cc;
> > +     port->tcpc->set_cc(port->tcpc, cc);
> > +}
> > +
> > +static enum typec_cc_status tcpm_rp_cc(struct tcpm_port *port);
>
> I think you should move the function here instead of adding the
> prototype for it.
>
> > +static int tcpm_ams_finish(struct tcpm_port *port)
> > +{
> > +     int ret = 0;
> > +
> > +     tcpm_log(port, "AMS %s finished", tcpm_ams_str[port->ams]);
> > +
> > +     if (port->pd_capable && port->pwr_role == TYPEC_SOURCE) {
> > +             if (port->negotiated_rev >= PD_REV30)
> > +                     tcpm_set_cc(port, SINK_TX_OK);
> > +             else
> > +                     tcpm_set_cc(port, SINK_TX_NG);
> > +     } else if (port->pwr_role == TYPEC_SOURCE) {
> > +             tcpm_set_cc(port, tcpm_rp_cc(port));
> > +     }
> > +
> > +     port->in_ams = false;
> > +     port->ams = NONE_AMS;
> > +
> > +     return ret;
> > +}
> > +
> >  static int tcpm_pd_transmit(struct tcpm_port *port,
> >                           enum tcpm_transmit_type type,
> >                           const struct pd_message *msg)
> > @@ -693,13 +786,30 @@ static int tcpm_pd_transmit(struct tcpm_port *port,
> >       switch (port->tx_status) {
> >       case TCPC_TX_SUCCESS:
> >               port->message_id = (port->message_id + 1) & PD_HEADER_ID_MASK;
> > -             return 0;
> > +             /*
> > +              * USB PD rev 2.0, 8.3.2.2.1:
> > +              * USB PD rev 3.0, 8.3.2.1.3:
> > +              * "... Note that every AMS is Interruptible until the first
> > +              * Message in the sequence has been successfully sent (GoodCRC
> > +              * Message received)."
> > +              */
> > +             if (port->ams != NONE_AMS)
> > +                     port->in_ams = true;
> > +             break;
> >       case TCPC_TX_DISCARDED:
> > -             return -EAGAIN;
> > +             ret = -EAGAIN;
> > +             break;
> >       case TCPC_TX_FAILED:
> >       default:
> > -             return -EIO;
> > +             ret = -EIO;
> > +             break;
> >       }
> > +
> > +     /* Some AMS don't expect responses. Finish them here. */
> > +     if (port->ams == ATTENTION || port->ams == SOURCE_ALERT)
> > +             tcpm_ams_finish(port);
> > +
> > +     return ret;
> >  }
> >
> >  void tcpm_pd_transmit_complete(struct tcpm_port *port,
> > @@ -1000,16 +1110,17 @@ static void tcpm_set_state(struct tcpm_port *port, enum tcpm_state state,
> >                          unsigned int delay_ms)
> >  {
> >       if (delay_ms) {
> > -             tcpm_log(port, "pending state change %s -> %s @ %u ms",
> > -                      tcpm_states[port->state], tcpm_states[state],
> > -                      delay_ms);
> > +             tcpm_log(port, "pending state change %s -> %s @ %u ms [%s %s]",
> > +                      tcpm_states[port->state], tcpm_states[state], delay_ms,
> > +                      pd_rev[port->negotiated_rev], tcpm_ams_str[port->ams]);
> >               port->delayed_state = state;
> >               mod_tcpm_delayed_work(port, delay_ms);
> >               port->delayed_runtime = ktime_add(ktime_get(), ms_to_ktime(delay_ms));
> >               port->delay_ms = delay_ms;
> >       } else {
> > -             tcpm_log(port, "state change %s -> %s",
> > -                      tcpm_states[port->state], tcpm_states[state]);
> > +             tcpm_log(port, "state change %s -> %s [%s %s]",
> > +                      tcpm_states[port->state], tcpm_states[state],
> > +                      pd_rev[port->negotiated_rev], tcpm_ams_str[port->ams]);
> >               port->delayed_state = INVALID_STATE;
> >               port->prev_state = port->state;
> >               port->state = state;
> > @@ -1031,10 +1142,11 @@ static void tcpm_set_state_cond(struct tcpm_port *port, enum tcpm_state state,
> >               tcpm_set_state(port, state, delay_ms);
> >       else
> >               tcpm_log(port,
> > -                      "skipped %sstate change %s -> %s [%u ms], context state %s",
> > +                      "skipped %sstate change %s -> %s [%u ms], context state %s [%s %s]",
> >                        delay_ms ? "delayed " : "",
> >                        tcpm_states[port->state], tcpm_states[state],
> > -                      delay_ms, tcpm_states[port->enter_state]);
> > +                      delay_ms, tcpm_states[port->enter_state],
> > +                      pd_rev[port->negotiated_rev], tcpm_ams_str[port->ams]);
> >  }
> >
> >  static void tcpm_queue_message(struct tcpm_port *port,
> > @@ -1044,6 +1156,149 @@ static void tcpm_queue_message(struct tcpm_port *port,
> >       mod_tcpm_delayed_work(port, 0);
> >  }
> >
> > +static bool tcpm_vdm_ams(struct tcpm_port *port)
> > +{
> > +     switch (port->ams) {
> > +     case DISCOVER_IDENTITY:
> > +     case SOURCE_STARTUP_CABLE_PLUG_DISCOVER_IDENTITY:
> > +     case DISCOVER_SVIDS:
> > +     case DISCOVER_MODES:
> > +     case DFP_TO_UFP_ENTER_MODE:
> > +     case DFP_TO_UFP_EXIT_MODE:
> > +     case DFP_TO_CABLE_PLUG_ENTER_MODE:
> > +     case DFP_TO_CABLE_PLUG_EXIT_MODE:
> > +     case ATTENTION:
> > +     case UNSTRUCTURED_VDMS:
> > +     case STRUCTURED_VDMS:
> > +             break;
> > +     default:
> > +             return false;
> > +     }
> > +
> > +     return true;
> > +}
> > +
> > +static bool tcpm_ams_interruptible(struct tcpm_port *port)
> > +{
> > +     switch (port->ams) {
> > +     /* Interruptible AMS */
> > +     case NONE_AMS:
> > +     case SECURITY:
> > +     case FIRMWARE_UPDATE:
> > +     case DISCOVER_IDENTITY:
> > +     case SOURCE_STARTUP_CABLE_PLUG_DISCOVER_IDENTITY:
> > +     case DISCOVER_SVIDS:
> > +     case DISCOVER_MODES:
> > +     case DFP_TO_UFP_ENTER_MODE:
> > +     case DFP_TO_UFP_EXIT_MODE:
> > +     case DFP_TO_CABLE_PLUG_ENTER_MODE:
> > +     case DFP_TO_CABLE_PLUG_EXIT_MODE:
> > +     case UNSTRUCTURED_VDMS:
> > +     case STRUCTURED_VDMS:
> > +     case COUNTRY_INFO:
> > +     case COUNTRY_CODES:
> > +             break;
> > +     /* Non-Interruptible AMS */
> > +     default:
> > +             if (port->in_ams)
> > +                     return false;
> > +             break;
> > +     }
> > +
> > +     return true;
> > +}
> > +
> > +static int tcpm_ams_start(struct tcpm_port *port, enum tcpm_ams ams)
> > +{
> > +     int ret = 0;
> > +
> > +     tcpm_log(port, "AMS %s start", tcpm_ams_str[ams]);
> > +
> > +     if (!tcpm_ams_interruptible(port) && ams != HARD_RESET) {
> > +             port->upcoming_state = INVALID_STATE;
> > +             tcpm_log(port, "AMS %s not interruptible, aborting",
> > +                      tcpm_ams_str[port->ams]);
> > +             return -EAGAIN;
> > +     }
> > +
> > +     if (port->pwr_role == TYPEC_SOURCE) {
> > +             enum typec_cc_status cc_req = port->cc_req;
> > +
> > +             port->ams = ams;
> > +
> > +             if (ams == HARD_RESET) {
> > +                     tcpm_set_cc(port, tcpm_rp_cc(port));
> > +                     tcpm_pd_transmit(port, TCPC_TX_HARD_RESET, NULL);
> > +                     tcpm_set_state(port, HARD_RESET_START, 0);
> > +                     return ret;
> > +             } else if (ams == SOFT_RESET_AMS) {
> > +                     if (!port->explicit_contract) {
> > +                             port->upcoming_state = INVALID_STATE;
> > +                             tcpm_set_cc(port, tcpm_rp_cc(port));
> > +                             return ret;
> > +                     }
> > +             } else if (tcpm_vdm_ams(port)) {
> > +                     /* tSinkTx is enforced in vdm_run_state_machine */
> > +                     if (port->negotiated_rev >= PD_REV30)
> > +                             tcpm_set_cc(port, SINK_TX_NG);
> > +                     return ret;
> > +             }
> > +
> > +             if (port->negotiated_rev >= PD_REV30)
> > +                     tcpm_set_cc(port, SINK_TX_NG);
> > +
> > +             switch (port->state) {
> > +             case SRC_READY:
> > +             case SRC_STARTUP:
> > +             case SRC_SOFT_RESET_WAIT_SNK_TX:
> > +             case SOFT_RESET:
> > +             case SOFT_RESET_SEND:
> > +                     if (port->negotiated_rev >= PD_REV30)
> > +                             tcpm_set_state(port, AMS_START,
> > +                                            cc_req == SINK_TX_OK ?
> > +                                            PD_T_SINK_TX : 0);
> > +                     else
> > +                             tcpm_set_state(port, AMS_START, 0);
> > +                     break;
> > +             default:
> > +                     if (port->negotiated_rev >= PD_REV30)
> > +                             tcpm_set_state(port, SRC_READY,
> > +                                            cc_req == SINK_TX_OK ?
> > +                                            PD_T_SINK_TX : 0);
> > +                     else
> > +                             tcpm_set_state(port, SRC_READY, 0);
> > +                     break;
> > +             }
> > +     } else {
> > +             if (port->negotiated_rev >= PD_REV30 &&
> > +                 !tcpm_sink_tx_ok(port) &&
> > +                 ams != SOFT_RESET_AMS &&
> > +                 ams != HARD_RESET) {
> > +                     port->upcoming_state = INVALID_STATE;
> > +                     tcpm_log(port, "Sink TX No Go");
> > +                     return -EAGAIN;
> > +             }
> > +
> > +             port->ams = ams;
> > +
> > +             if (ams == HARD_RESET) {
> > +                     tcpm_pd_transmit(port, TCPC_TX_HARD_RESET, NULL);
> > +                     tcpm_set_state(port, HARD_RESET_START, 0);
> > +                     return ret;
> > +             } else if (tcpm_vdm_ams(port)) {
> > +                     return ret;
> > +             }
> > +
> > +             if (port->state == SNK_READY ||
> > +                 port->state == SNK_SOFT_RESET)
> > +                     tcpm_set_state(port, AMS_START, 0);
> > +             else
> > +                     tcpm_set_state(port, SNK_READY, 0);
> > +     }
> > +
> > +     return ret;
> > +}
> > +
> >  /*
> >   * VDM/VDO handling functions
> >   */
> > @@ -1236,6 +1491,8 @@ static int tcpm_pd_svdm(struct tcpm_port *port, struct typec_altmode *adev,
> >               if (IS_ERR_OR_NULL(port->partner))
> >                       break;
> >
> > +             tcpm_ams_finish(port);
> > +
> >               switch (cmd) {
> >               case CMD_DISCOVER_IDENT:
> >                       /* 6.4.4.3.1 */
> > @@ -1286,6 +1543,7 @@ static int tcpm_pd_svdm(struct tcpm_port *port, struct typec_altmode *adev,
> >               }
> >               break;
> >       case CMDT_RSP_NAK:
> > +             tcpm_ams_finish(port);
> >               switch (cmd) {
> >               case CMD_ENTER_MODE:
> >                       /* Back to USB Operation */
> > @@ -1435,7 +1693,8 @@ static unsigned int vdm_ready_timeout(u32 vdm_hdr)
> >  static void vdm_run_state_machine(struct tcpm_port *port)
> >  {
> >       struct pd_message msg;
> > -     int i, res;
> > +     int i, res = 0;
> > +     u32 vdo_hdr = port->vdo_data[0];
> >
> >       switch (port->vdm_state) {
> >       case VDM_STATE_READY:
> > @@ -1452,26 +1711,47 @@ static void vdm_run_state_machine(struct tcpm_port *port)
> >               if (port->state != SRC_READY && port->state != SNK_READY)
> >                       break;
> >
> > -             /* Prepare and send VDM */
> > -             memset(&msg, 0, sizeof(msg));
> > -             msg.header = PD_HEADER_LE(PD_DATA_VENDOR_DEF,
> > -                                       port->pwr_role,
> > -                                       port->data_role,
> > -                                       port->negotiated_rev,
> > -                                       port->message_id, port->vdo_count);
> > -             for (i = 0; i < port->vdo_count; i++)
> > -                     msg.payload[i] = cpu_to_le32(port->vdo_data[i]);
> > -             res = tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
> > -             if (res < 0) {
> > -                     port->vdm_state = VDM_STATE_ERR_SEND;
> > -             } else {
> > -                     unsigned long timeout;
> > +             /* TODO: AMS operation for Unstructured VDM */
> > +             if (PD_VDO_SVDM(vdo_hdr) && PD_VDO_CMDT(vdo_hdr) == CMDT_INIT) {
> > +                     switch (PD_VDO_CMD(vdo_hdr)) {
> > +                     case CMD_DISCOVER_IDENT:
> > +                             res = tcpm_ams_start(port, DISCOVER_IDENTITY);
> > +                             break;
> > +                     case CMD_DISCOVER_SVID:
> > +                             res = tcpm_ams_start(port, DISCOVER_SVIDS);
> > +                             break;
> > +                     case CMD_DISCOVER_MODES:
> > +                             res = tcpm_ams_start(port, DISCOVER_MODES);
> > +                             break;
> > +                     case CMD_ENTER_MODE:
> > +                             res = tcpm_ams_start(port,
> > +                                                  DFP_TO_UFP_ENTER_MODE);
>
> One line is enough:
>
>                                 res = tcpm_ams_start(port, DFP_TO_UFP_ENTER_MODE);
>
> > +                             break;
> > +                     case CMD_EXIT_MODE:
> > +                             res = tcpm_ams_start(port,
> > +                                                  DFP_TO_UFP_EXIT_MODE);
>
> Ditto.
>
> > +                             break;
> > +                     case CMD_ATTENTION:
> > +                             res = tcpm_ams_start(port, ATTENTION);
> > +                             break;
> > +                     case VDO_CMD_VENDOR(0) ... VDO_CMD_VENDOR(15):
> > +                             res = tcpm_ams_start(port, STRUCTURED_VDMS);
> > +                             break;
> > +                     default:
> > +                             res = -EOPNOTSUPP;
> > +                             break;
> > +                     }
> >
> > -                     port->vdm_retries = 0;
> > -                     port->vdm_state = VDM_STATE_BUSY;
> > -                     timeout = vdm_ready_timeout(port->vdo_data[0]);
> > -                     mod_vdm_delayed_work(port, timeout);
> > +                     if (res < 0)
> > +                             return;
> >               }
> > +
> > +             port->vdm_state = VDM_STATE_SEND_MESSAGE;
> > +             mod_vdm_delayed_work(port, (port->negotiated_rev >= PD_REV30) &&
> > +                                        (port->pwr_role == TYPEC_SOURCE) &&
> > +                                        (PD_VDO_SVDM(vdo_hdr)) &&
> > +                                        (PD_VDO_CMDT(vdo_hdr) == CMDT_INIT) ?
> > +                                        PD_T_SINK_TX : 0);
>
> I don't think you need all those brackets. This would look better, and
> I bet it would make also scripts/checkpatch.pl happy:
>
>                 mod_vdm_delayed_work(port, (port->negotiated_rev >= PD_REV30 &&
>                                             port->pwr_role == TYPEC_SOURCE &&
>                                             PD_VDO_SVDM(vdo_hdr) &&
>                                             PD_VDO_CMDT(vdo_hdr) == CMDT_INIT) ?
>                                            PD_T_SINK_TX : 0);
>
> >               break;
> >       case VDM_STATE_WAIT_RSP_BUSY:
> >               port->vdo_data[0] = port->vdo_retry;
> > @@ -1480,6 +1760,8 @@ static void vdm_run_state_machine(struct tcpm_port *port)
> >               break;
> >       case VDM_STATE_BUSY:
> >               port->vdm_state = VDM_STATE_ERR_TMOUT;
> > +             if (port->ams != NONE_AMS)
> > +                     tcpm_ams_finish(port);
> >               break;
> >       case VDM_STATE_ERR_SEND:
> >               /*
> > @@ -1492,6 +1774,29 @@ static void vdm_run_state_machine(struct tcpm_port *port)
> >                       tcpm_log(port, "VDM Tx error, retry");
> >                       port->vdm_retries++;
> >                       port->vdm_state = VDM_STATE_READY;
> > +                     tcpm_ams_finish(port);
> > +             }
> > +             break;
> > +     case VDM_STATE_SEND_MESSAGE:
> > +             /* Prepare and send VDM */
> > +             memset(&msg, 0, sizeof(msg));
> > +             msg.header = PD_HEADER_LE(PD_DATA_VENDOR_DEF,
> > +                                       port->pwr_role,
> > +                                       port->data_role,
> > +                                       port->negotiated_rev,
> > +                                       port->message_id, port->vdo_count);
> > +             for (i = 0; i < port->vdo_count; i++)
> > +                     msg.payload[i] = cpu_to_le32(port->vdo_data[i]);
> > +             res = tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
> > +             if (res < 0) {
> > +                     port->vdm_state = VDM_STATE_ERR_SEND;
> > +             } else {
> > +                     unsigned long timeout;
> > +
> > +                     port->vdm_retries = 0;
> > +                     port->vdm_state = VDM_STATE_BUSY;
> > +                     timeout = vdm_ready_timeout(vdo_hdr);
> > +                     mod_vdm_delayed_work(port, timeout);
> >               }
> >               break;
> >       default:
> > @@ -1514,7 +1819,8 @@ static void vdm_state_machine_work(struct kthread_work *work)
> >               prev_state = port->vdm_state;
> >               vdm_run_state_machine(port);
> >       } while (port->vdm_state != prev_state &&
> > -              port->vdm_state != VDM_STATE_BUSY);
> > +              port->vdm_state != VDM_STATE_BUSY &&
> > +              port->vdm_state != VDM_STATE_SEND_MESSAGE);
> >
> >       mutex_unlock(&port->lock);
> >  }
> > @@ -1997,11 +2303,14 @@ static void tcpm_pd_ctrl_request(struct tcpm_port *port,
> >               case SOFT_RESET_SEND:
> >                       port->message_id = 0;
> >                       port->rx_msgid = -1;
> > -                     if (port->pwr_role == TYPEC_SOURCE)
> > -                             next_state = SRC_SEND_CAPABILITIES;
> > -                     else
> > -                             next_state = SNK_WAIT_CAPABILITIES;
> > -                     tcpm_set_state(port, next_state, 0);
> > +                     if (port->ams == SOFT_RESET_AMS)
> > +                             tcpm_ams_finish(port);
> > +                     if (port->pwr_role == TYPEC_SOURCE) {
> > +                             port->upcoming_state = SRC_SEND_CAPABILITIES;
> > +                             tcpm_ams_start(port, POWER_NEGOTIATION);
> > +                     } else {
> > +                             tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
> > +                     }
> >                       break;
> >               case DR_SWAP_SEND:
> >                       tcpm_set_state(port, DR_SWAP_CHANGE_DR, 0);
> > @@ -2776,13 +3085,6 @@ static bool tcpm_start_toggling(struct tcpm_port *port, enum typec_cc_status cc)
> >       return ret == 0;
> >  }
> >
> > -static void tcpm_set_cc(struct tcpm_port *port, enum typec_cc_status cc)
> > -{
> > -     tcpm_log(port, "cc:=%d", cc);
> > -     port->cc_req = cc;
> > -     port->tcpc->set_cc(port->tcpc, cc);
> > -}
> > -
> >  static int tcpm_init_vbus(struct tcpm_port *port)
> >  {
> >       int ret;
> > @@ -2912,6 +3214,8 @@ static void tcpm_reset_port(struct tcpm_port *port)
> >               ret = port->tcpc->enable_auto_vbus_discharge(port->tcpc, false);
> >               tcpm_log_force(port, "Disable vbus discharge ret:%d", ret);
> >       }
> > +     port->in_ams = false;
> > +     port->ams = NONE_AMS;
> >       tcpm_unregister_altmodes(port);
> >       tcpm_typec_disconnect(port);
> >       port->attached = false;
> > @@ -3090,6 +3394,7 @@ static void run_state_machine(struct tcpm_port *port)
> >       int ret;
> >       enum typec_pwr_opmode opmode;
> >       unsigned int msecs;
> > +     enum tcpm_state upcoming_state;
> >
> >       port->enter_state = port->state;
> >       switch (port->state) {
> > @@ -3190,7 +3495,12 @@ static void run_state_machine(struct tcpm_port *port)
> >               port->message_id = 0;
> >               port->rx_msgid = -1;
> >               port->explicit_contract = false;
> > -             tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
> > +             /* SNK -> SRC POWER/FAST_ROLE_SWAP finished */
> > +             if (port->ams == POWER_ROLE_SWAP ||
> > +                 port->ams == FAST_ROLE_SWAP)
> > +                     tcpm_ams_finish(port);
> > +             port->upcoming_state = SRC_SEND_CAPABILITIES;
> > +             tcpm_ams_start(port, POWER_NEGOTIATION);
> >               break;
> >       case SRC_SEND_CAPABILITIES:
> >               port->caps_count++;
> > @@ -3272,6 +3582,19 @@ static void run_state_machine(struct tcpm_port *port)
> >               tcpm_swap_complete(port, 0);
> >               tcpm_typec_connect(port);
> >
> > +             if (port->ams != NONE_AMS)
> > +                     tcpm_ams_finish(port);
> > +             /*
> > +              * If previous AMS is interrupted, switch to the upcoming
> > +              * state.
> > +              */
> > +             upcoming_state = port->upcoming_state;
> > +             if (port->upcoming_state != INVALID_STATE) {
> > +                     port->upcoming_state = INVALID_STATE;
> > +                     tcpm_set_state(port, upcoming_state, 0);
> > +                     break;
> > +             }
>
> I don't see the local upcoming_state variable is being used anywhere
> outside of these conditions, so please set it inside the condition
> block:
>
>                 if (port->upcoming_state != INVALID_STATE) {
>                         upcoming_state = port->upcoming_state;
>                         port->upcoming_state = INVALID_STATE;
>                         tcpm_set_state(port, upcoming_state, 0);
>                         break;
>                 }
>
> >               tcpm_check_send_discover(port);
> >               /*
> >                * 6.3.5
> > @@ -3389,6 +3712,12 @@ static void run_state_machine(struct tcpm_port *port)
> >               port->message_id = 0;
> >               port->rx_msgid = -1;
> >               port->explicit_contract = false;
> > +
> > +             if (port->ams == POWER_ROLE_SWAP ||
> > +                 port->ams == FAST_ROLE_SWAP)
> > +                     /* SRC -> SNK POWER/FAST_ROLE_SWAP finished */
> > +                     tcpm_ams_finish(port);
> > +
> >               tcpm_set_state(port, SNK_DISCOVERY, 0);
> >               break;
> >       case SNK_DISCOVERY:
> > @@ -3437,7 +3766,7 @@ static void run_state_machine(struct tcpm_port *port)
> >                */
> >               if (port->vbus_never_low) {
> >                       port->vbus_never_low = false;
> > -                     tcpm_set_state(port, SOFT_RESET_SEND,
> > +                     tcpm_set_state(port, SNK_SOFT_RESET,
> >                                      PD_T_SINK_WAIT_CAP);
> >               } else {
> >                       tcpm_set_state(port, hard_reset_state(port),
> > @@ -3490,9 +3819,23 @@ static void run_state_machine(struct tcpm_port *port)
> >
> >               tcpm_swap_complete(port, 0);
> >               tcpm_typec_connect(port);
> > -             tcpm_check_send_discover(port);
> >               mod_enable_frs_delayed_work(port, 0);
> >               tcpm_pps_complete(port, port->pps_status);
> > +
> > +             if (port->ams != NONE_AMS)
> > +                     tcpm_ams_finish(port);
> > +             /*
> > +              * If previous AMS is interrupted, switch to the upcoming
> > +              * state.
> > +              */
> > +             upcoming_state = port->upcoming_state;
> > +             if (port->upcoming_state != INVALID_STATE) {
> > +                     port->upcoming_state = INVALID_STATE;
> > +                     tcpm_set_state(port, upcoming_state, 0);
> > +                     break;
> > +             }
>
> Same here.
>
> > +             tcpm_check_send_discover(port);
> >               power_supply_changed(port->psy);
> >               break;
> >
> > @@ -3513,8 +3856,14 @@ static void run_state_machine(struct tcpm_port *port)
> >
> >       /* Hard_Reset states */
> >       case HARD_RESET_SEND:
> > -             tcpm_pd_transmit(port, TCPC_TX_HARD_RESET, NULL);
> > -             tcpm_set_state(port, HARD_RESET_START, 0);
> > +             if (port->ams != NONE_AMS)
> > +                     tcpm_ams_finish(port);
> > +             /*
> > +              * State machine will be directed to HARD_RESET_START,
> > +              * thus set upcoming_state to INVALID_STATE.
> > +              */
> > +             port->upcoming_state = INVALID_STATE;
> > +             tcpm_ams_start(port, HARD_RESET);
> >               break;
> >       case HARD_RESET_START:
> >               port->sink_cap_done = false;
> > @@ -3558,6 +3907,8 @@ static void run_state_machine(struct tcpm_port *port)
> >       case SRC_HARD_RESET_VBUS_ON:
> >               tcpm_set_vconn(port, true);
> >               tcpm_set_vbus(port, true);
> > +             if (port->ams == HARD_RESET)
> > +                     tcpm_ams_finish(port);
> >               port->tcpc->set_pd_rx(port->tcpc, true);
> >               tcpm_set_attached_state(port, true);
> >               tcpm_set_state(port, SRC_UNATTACHED, PD_T_PS_SOURCE_ON);
> > @@ -3579,6 +3930,8 @@ static void run_state_machine(struct tcpm_port *port)
> >               tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, PD_T_SAFE_0V);
> >               break;
> >       case SNK_HARD_RESET_WAIT_VBUS:
> > +             if (port->ams == HARD_RESET)
> > +                     tcpm_ams_finish(port);
> >               /* Assume we're disconnected if VBUS doesn't come back. */
> >               tcpm_set_state(port, SNK_UNATTACHED,
> >                              PD_T_SRC_RECOVER_MAX + PD_T_SRC_TURN_ON);
> > @@ -3606,6 +3959,8 @@ static void run_state_machine(struct tcpm_port *port)
> >                                              5000);
> >                       tcpm_set_charge(port, true);
> >               }
> > +             if (port->ams == HARD_RESET)
> > +                     tcpm_ams_finish(port);
> >               tcpm_set_attached_state(port, true);
> >               tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, VSAFE5V);
> >               tcpm_set_state(port, SNK_STARTUP, 0);
> > @@ -3616,10 +3971,19 @@ static void run_state_machine(struct tcpm_port *port)
> >               port->message_id = 0;
> >               port->rx_msgid = -1;
> >               tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
> > -             if (port->pwr_role == TYPEC_SOURCE)
> > -                     tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
> > -             else
> > +             if (port->pwr_role == TYPEC_SOURCE) {
> > +                     port->upcoming_state = SRC_SEND_CAPABILITIES;
> > +                     tcpm_ams_start(port, POWER_NEGOTIATION);
> > +             } else {
> >                       tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
> > +             }
> > +             break;
> > +     case SRC_SOFT_RESET_WAIT_SNK_TX:
> > +     case SNK_SOFT_RESET:
> > +             if (port->ams != NONE_AMS)
> > +                     tcpm_ams_finish(port);
> > +             port->upcoming_state = SOFT_RESET_SEND;
> > +             tcpm_ams_start(port, SOFT_RESET_AMS);
> >               break;
> >       case SOFT_RESET_SEND:
> >               port->message_id = 0;
> > @@ -3886,6 +4250,19 @@ static void run_state_machine(struct tcpm_port *port)
> >                              tcpm_default_state(port),
> >                              port->vbus_present ? PD_T_PS_SOURCE_OFF : 0);
> >               break;
> > +
> > +     /* AMS intermediate state */
> > +     case AMS_START:
> > +             if (port->upcoming_state == INVALID_STATE) {
> > +                     tcpm_set_state(port, port->pwr_role == TYPEC_SOURCE ?
> > +                                    SRC_READY : SNK_READY, 0);
> > +                     break;
> > +             }
> > +
> > +             upcoming_state = port->upcoming_state;
> > +             port->upcoming_state = INVALID_STATE;
> > +             tcpm_set_state(port, upcoming_state, 0);
> > +             break;
> >       default:
> >               WARN(1, "Unexpected port state %d\n", port->state);
> >               break;
> > @@ -4313,6 +4690,8 @@ static void _tcpm_pd_hard_reset(struct tcpm_port *port)
> >       if (port->bist_request == BDO_MODE_TESTDATA && port->tcpc->set_bist_data)
> >               port->tcpc->set_bist_data(port->tcpc, false);
> >
> > +     if (port->ams != NONE_AMS)
> > +             port->ams = NONE_AMS;
> >       /*
> >        * If we keep receiving hard reset requests, executing the hard reset
> >        * must have failed. Revert to error recovery if that happens.
> > @@ -4501,7 +4880,12 @@ static int tcpm_dr_set(struct typec_port *p, enum typec_data_role data)
> >               port->non_pd_role_swap = true;
> >               tcpm_set_state(port, PORT_RESET, 0);
> >       } else {
> > -             tcpm_set_state(port, DR_SWAP_SEND, 0);
> > +             port->upcoming_state = DR_SWAP_SEND;
> > +             ret = tcpm_ams_start(port, DATA_ROLE_SWAP);
> > +             if (ret == -EAGAIN) {
> > +                     port->upcoming_state = INVALID_STATE;
> > +                     goto port_unlock;
> > +             }
> >       }
> >
> >       port->swap_status = 0;
> > @@ -4547,10 +4931,16 @@ static int tcpm_pr_set(struct typec_port *p, enum typec_role role)
> >               goto port_unlock;
> >       }
> >
> > +     port->upcoming_state = PR_SWAP_SEND;
> > +     ret = tcpm_ams_start(port, POWER_ROLE_SWAP);
> > +     if (ret == -EAGAIN) {
> > +             port->upcoming_state = INVALID_STATE;
> > +             goto port_unlock;
> > +     }
> > +
> >       port->swap_status = 0;
> >       port->swap_pending = true;
> >       reinit_completion(&port->swap_complete);
> > -     tcpm_set_state(port, PR_SWAP_SEND, 0);
> >       mutex_unlock(&port->lock);
> >
> >       if (!wait_for_completion_timeout(&port->swap_complete,
> > @@ -4586,10 +4976,16 @@ static int tcpm_vconn_set(struct typec_port *p, enum typec_role role)
> >               goto port_unlock;
> >       }
> >
> > +     port->upcoming_state = VCONN_SWAP_SEND;
> > +     ret = tcpm_ams_start(port, VCONN_SWAP);
> > +     if (ret == -EAGAIN) {
> > +             port->upcoming_state = INVALID_STATE;
> > +             goto port_unlock;
> > +     }
> > +
> >       port->swap_status = 0;
> >       port->swap_pending = true;
> >       reinit_completion(&port->swap_complete);
> > -     tcpm_set_state(port, VCONN_SWAP_SEND, 0);
> >       mutex_unlock(&port->lock);
> >
> >       if (!wait_for_completion_timeout(&port->swap_complete,
> > @@ -4654,6 +5050,13 @@ static int tcpm_pps_set_op_curr(struct tcpm_port *port, u16 op_curr)
> >               goto port_unlock;
> >       }
> >
> > +     port->upcoming_state = SNK_NEGOTIATE_PPS_CAPABILITIES;
> > +     ret = tcpm_ams_start(port, POWER_NEGOTIATION);
> > +     if (ret == -EAGAIN) {
> > +             port->upcoming_state = INVALID_STATE;
> > +             goto port_unlock;
> > +     }
> > +
> >       /* Round down operating current to align with PPS valid steps */
> >       op_curr = op_curr - (op_curr % RDO_PROG_CURR_MA_STEP);
> >
> > @@ -4661,7 +5064,6 @@ static int tcpm_pps_set_op_curr(struct tcpm_port *port, u16 op_curr)
> >       port->pps_data.op_curr = op_curr;
> >       port->pps_status = 0;
> >       port->pps_pending = true;
> > -     tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0);
> >       mutex_unlock(&port->lock);
> >
> >       if (!wait_for_completion_timeout(&port->pps_complete,
> > @@ -4710,6 +5112,13 @@ static int tcpm_pps_set_out_volt(struct tcpm_port *port, u16 out_volt)
> >               goto port_unlock;
> >       }
> >
> > +     port->upcoming_state = SNK_NEGOTIATE_PPS_CAPABILITIES;
> > +     ret = tcpm_ams_start(port, POWER_NEGOTIATION);
> > +     if (ret == -EAGAIN) {
> > +             port->upcoming_state = INVALID_STATE;
> > +             goto port_unlock;
> > +     }
> > +
> >       /* Round down output voltage to align with PPS valid steps */
> >       out_volt = out_volt - (out_volt % RDO_PROG_VOLT_MV_STEP);
> >
> > @@ -4717,7 +5126,6 @@ static int tcpm_pps_set_out_volt(struct tcpm_port *port, u16 out_volt)
> >       port->pps_data.out_volt = out_volt;
> >       port->pps_status = 0;
> >       port->pps_pending = true;
> > -     tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0);
> >       mutex_unlock(&port->lock);
> >
> >       if (!wait_for_completion_timeout(&port->pps_complete,
> > @@ -4757,6 +5165,16 @@ static int tcpm_pps_activate(struct tcpm_port *port, bool activate)
> >               goto port_unlock;
> >       }
> >
> > +     if (activate)
> > +             port->upcoming_state = SNK_NEGOTIATE_PPS_CAPABILITIES;
> > +     else
> > +             port->upcoming_state = SNK_NEGOTIATE_CAPABILITIES;
> > +     ret = tcpm_ams_start(port, POWER_NEGOTIATION);
> > +     if (ret == -EAGAIN) {
> > +             port->upcoming_state = INVALID_STATE;
> > +             goto port_unlock;
> > +     }
> > +
> >       reinit_completion(&port->pps_complete);
> >       port->pps_status = 0;
> >       port->pps_pending = true;
> > @@ -4765,9 +5183,6 @@ static int tcpm_pps_activate(struct tcpm_port *port, bool activate)
> >       if (activate) {
> >               port->pps_data.out_volt = port->supply_voltage;
> >               port->pps_data.op_curr = port->current_limit;
> > -             tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0);
> > -     } else {
> > -             tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
> >       }
> >       mutex_unlock(&port->lock);
> >
> > diff --git a/include/linux/usb/pd.h b/include/linux/usb/pd.h
> > index bb9a782e1411..79599b90ba55 100644
> > --- a/include/linux/usb/pd.h
> > +++ b/include/linux/usb/pd.h
> > @@ -479,6 +479,7 @@ static inline unsigned int rdo_max_power(u32 rdo)
> >  #define PD_T_NEWSRC          250     /* Maximum of 275ms */
> >  #define PD_T_SWAP_SRC_START  20      /* Minimum of 20ms */
> >  #define PD_T_BIST_CONT_MODE  50      /* 30 - 60 ms */
> > +#define PD_T_SINK_TX         16      /* 16 - 20 ms */
> >
> >  #define PD_T_DRP_TRY         100     /* 75 - 150 ms */
> >  #define PD_T_DRP_TRYWAIT     600     /* 400 - 800 ms */
> > diff --git a/include/linux/usb/tcpm.h b/include/linux/usb/tcpm.h
> > index f4a18427f5c4..3af99f85e8b9 100644
> > --- a/include/linux/usb/tcpm.h
> > +++ b/include/linux/usb/tcpm.h
> > @@ -19,6 +19,10 @@ enum typec_cc_status {
> >       TYPEC_CC_RP_3_0,
> >  };
> >
> > +/* Collision Avoidance */
> > +#define SINK_TX_NG   TYPEC_CC_RP_1_5
> > +#define SINK_TX_OK   TYPEC_CC_RP_3_0
> > +
> >  enum typec_cc_polarity {
> >       TYPEC_POLARITY_CC1,
> >       TYPEC_POLARITY_CC2,
> > --
> > 2.29.2.729.g45daf8777d-goog
>
> thanks,
>
> --
> heikki

Kyle Tso Jan. 13, 2021, 2:44 p.m. UTC | #3

On Tue, Jan 12, 2021 at 9:29 PM Heikki Krogerus
<heikki.krogerus@linux.intel.com> wrote:
>
> On Wed, Jan 06, 2021 at 12:39:25AM +0800, Kyle Tso wrote:
> > This patch provides the implementation of Collision Avoidance introduced
> > in PD3.0. The start of each Atomic Message Sequence (AMS) initiated by
> > the port will be denied if the current AMS is not interruptible. The
> > Source port will set the CC to SinkTxNG if it is going to initiate an
> > AMS, and SinkTxOk otherwise. Meanwhile, any AMS initiated by a Sink port
> > will be denied in TCPM if the port partner (Source) sets SinkTxNG except
> > for HARD_RESET and SOFT_RESET.
> >
> > Signed-off-by: Kyle Tso <kyletso@google.com>
> > Signed-off-by: Will McVicker <willmcvicker@google.com>
>
> So did you and Will develop this patch together?
>
Not really.
Will cherry-picked the patch from our old branch to a later one which
is more close to Upstream.
And I cherry-picked his version so the signed-off is here.
I will remove the signed-off if that is the right move.

> Few nitpicks below.
>

> > +static void tcpm_set_cc(struct tcpm_port *port, enum typec_cc_status cc)
> > +{
> > +     tcpm_log(port, "cc:=%d", cc);
> > +     port->cc_req = cc;
> > +     port->tcpc->set_cc(port->tcpc, cc);
> > +}
> > +
> > +static enum typec_cc_status tcpm_rp_cc(struct tcpm_port *port);
>
> I think you should move the function here instead of adding the
> prototype for it.
>
will fix this in the next patch version.


> > +                     case CMD_DISCOVER_MODES:
> > +                             res = tcpm_ams_start(port, DISCOVER_MODES);
> > +                             break;
> > +                     case CMD_ENTER_MODE:
> > +                             res = tcpm_ams_start(port,
> > +                                                  DFP_TO_UFP_ENTER_MODE);
>
> One line is enough:
>
>                                 res = tcpm_ams_start(port, DFP_TO_UFP_ENTER_MODE);
>
will fix this in the next patch version.

> > +                             break;
> > +                     case CMD_EXIT_MODE:
> > +                             res = tcpm_ams_start(port,
> > +                                                  DFP_TO_UFP_EXIT_MODE);
>
> Ditto.
>
will fix this in the next patch version.

> > +                             break;
> > +                     case CMD_ATTENTION:
> > +                             res = tcpm_ams_start(port, ATTENTION);
> > +                             break;
> > +                     case VDO_CMD_VENDOR(0) ... VDO_CMD_VENDOR(15):
> > +                             res = tcpm_ams_start(port, STRUCTURED_VDMS);
> > +                             break;
> > +                     default:
> > +                             res = -EOPNOTSUPP;
> > +                             break;
> > +                     }
> >
> > -                     port->vdm_retries = 0;
> > -                     port->vdm_state = VDM_STATE_BUSY;
> > -                     timeout = vdm_ready_timeout(port->vdo_data[0]);
> > -                     mod_vdm_delayed_work(port, timeout);
> > +                     if (res < 0)
> > +                             return;
> >               }
> > +
> > +             port->vdm_state = VDM_STATE_SEND_MESSAGE;
> > +             mod_vdm_delayed_work(port, (port->negotiated_rev >= PD_REV30) &&
> > +                                        (port->pwr_role == TYPEC_SOURCE) &&
> > +                                        (PD_VDO_SVDM(vdo_hdr)) &&
> > +                                        (PD_VDO_CMDT(vdo_hdr) == CMDT_INIT) ?
> > +                                        PD_T_SINK_TX : 0);
>
> I don't think you need all those brackets. This would look better, and
> I bet it would make also scripts/checkpatch.pl happy:
>
>                 mod_vdm_delayed_work(port, (port->negotiated_rev >= PD_REV30 &&
>                                             port->pwr_role == TYPEC_SOURCE &&
>                                             PD_VDO_SVDM(vdo_hdr) &&
>                                             PD_VDO_CMDT(vdo_hdr) == CMDT_INIT) ?
>                                            PD_T_SINK_TX : 0);
>
will fix this in the next patch version.


> > +             /*
> > +              * If previous AMS is interrupted, switch to the upcoming
> > +              * state.
> > +              */
> > +             upcoming_state = port->upcoming_state;
> > +             if (port->upcoming_state != INVALID_STATE) {
> > +                     port->upcoming_state = INVALID_STATE;
> > +                     tcpm_set_state(port, upcoming_state, 0);
> > +                     break;
> > +             }
>
> I don't see the local upcoming_state variable is being used anywhere
> outside of these conditions, so please set it inside the condition
> block:
>
>                 if (port->upcoming_state != INVALID_STATE) {
>                         upcoming_state = port->upcoming_state;
>                         port->upcoming_state = INVALID_STATE;
>                         tcpm_set_state(port, upcoming_state, 0);
>                         break;
>                 }
>
will do


> > +             upcoming_state = port->upcoming_state;
> > +             if (port->upcoming_state != INVALID_STATE) {
> > +                     port->upcoming_state = INVALID_STATE;
> > +                     tcpm_set_state(port, upcoming_state, 0);
> > +                     break;
> > +             }
>
> Same here.
>
will do

thanks,
Kyle

Kyle Tso Jan. 13, 2021, 2:46 p.m. UTC | #4

On Wed, Jan 13, 2021 at 2:11 PM Badhri Jagan Sridharan
<badhri@google.com> wrote:
>
> Hi Kyle,
>
> Do you want to handle the FAST_ROLE_SWAP case as well ?
>
I forgot this part....
Thanks for catching this.
I will fix it.


> You would have to fix up in two places:
>
> #1
> -                       if (port->state == SNK_READY)
> -                               tcpm_set_state(port, FR_SWAP_SEND, 0);
> -                       else
> +                       if (port->state == SNK_READY) {
> +                               int ret;
> +
> +                               port->upcoming_state = FR_SWAP_SEND;
> +                               ret = tcpm_ams_start(port, FAST_ROLE_SWAP);
> +                               if (ret == -EAGAIN)
> +                                       port->upcoming_state = INVALID_STATE;
> +                       } else {
>                                 tcpm_log(port, "Discarding FRS_SIGNAL!
> Not in sink ready");
> +                       }
>
> #2
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -4449,9 +4449,14 @@ static void tcpm_enable_frs_work(struct
> kthread_work *work)
>         if (port->state != SNK_READY || port->vdm_state !=
> VDM_STATE_DONE || port->send_discover)
>                 goto resched;
>
> -       tcpm_set_state(port, GET_SINK_CAP, 0);
> -       port->sink_cap_done = true;
> -
> +       port->upcoming_state = GET_SINK_CAP;
> +       ret = tcpm_ams_start(port, GET_SINK_CAPABILITIES);
> +       if (ret == -EAGAIN) {
> +               port->upcoming_state = INVALID_STATE;
> +       } else {
> +               port->sink_cap_done = true;
> +               goto unlock;
> +       }
>
> Thanks,
> Badhri
>
>

Hans de Goede Jan. 13, 2021, 8:55 p.m. UTC | #5

Hi,

On 1/13/21 3:46 PM, Kyle Tso wrote:
> On Wed, Jan 13, 2021 at 2:11 PM Badhri Jagan Sridharan
> <badhri@google.com> wrote:
>>
>> Hi Kyle,
>>
>> Do you want to handle the FAST_ROLE_SWAP case as well ?
>>
> I forgot this part....
> Thanks for catching this.
> I will fix it.

That sounds like a v6 is upcoming which not only will have
code-style changes but also some functional changes ?

In that case I will wait a bit before running the tests
which I want to run with this patch-set and run those
tests with v6 so that I don't have to redo them later.

Regards,

Hans



> 
> 
>> You would have to fix up in two places:
>>
>> #1
>> -                       if (port->state == SNK_READY)
>> -                               tcpm_set_state(port, FR_SWAP_SEND, 0);
>> -                       else
>> +                       if (port->state == SNK_READY) {
>> +                               int ret;
>> +
>> +                               port->upcoming_state = FR_SWAP_SEND;
>> +                               ret = tcpm_ams_start(port, FAST_ROLE_SWAP);
>> +                               if (ret == -EAGAIN)
>> +                                       port->upcoming_state = INVALID_STATE;
>> +                       } else {
>>                                 tcpm_log(port, "Discarding FRS_SIGNAL!
>> Not in sink ready");
>> +                       }
>>
>> #2
>> --- a/drivers/usb/typec/tcpm/tcpm.c
>> +++ b/drivers/usb/typec/tcpm/tcpm.c
>> @@ -4449,9 +4449,14 @@ static void tcpm_enable_frs_work(struct
>> kthread_work *work)
>>         if (port->state != SNK_READY || port->vdm_state !=
>> VDM_STATE_DONE || port->send_discover)
>>                 goto resched;
>>
>> -       tcpm_set_state(port, GET_SINK_CAP, 0);
>> -       port->sink_cap_done = true;
>> -
>> +       port->upcoming_state = GET_SINK_CAP;
>> +       ret = tcpm_ams_start(port, GET_SINK_CAPABILITIES);
>> +       if (ret == -EAGAIN) {
>> +               port->upcoming_state = INVALID_STATE;
>> +       } else {
>> +               port->sink_cap_done = true;
>> +               goto unlock;
>> +       }
>>
>> Thanks,
>> Badhri
>>
>>
>

[v5,1/3] usb: typec: tcpm: AMS and Collision Avoidance

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