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Sender: Guenter Roeck <groeck7@gmail.com>
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Date:   Thu, 8 Dec 2022 15:56:51 -0800
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To:     Badhri Jagan Sridharan <badhri@google.com>,
        Heikki Krogerus <heikki.krogerus@linux.intel.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
        Kyle Tso <kyletso@google.com>
References: <20221208150456.473056-1-badhri@google.com>
From:   Guenter Roeck <linux@roeck-us.net>
Subject: Re: [PATCH v6 1/3] usb: typec: tcpm: Add callbacks to mitigate
 wakeups due to contaminant
In-Reply-To: <20221208150456.473056-1-badhri@google.com>
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On 12/8/22 07:04, Badhri Jagan Sridharan wrote:
> On some of the TCPC implementations, when the Type-C port is exposed
> to contaminants, such as water, TCPC stops toggling while reporting OPEN
> either by the time TCPM reads CC pin status or during CC debounce
> window. This causes TCPM to be stuck in TOGGLING state. If TCPM is made
> to restart toggling, the behavior recurs causing redundant CPU wakeups
> till the USB-C port is free of contaminant.
> 
> [206199.287817] CC1: 0 -> 0, CC2: 0 -> 0 [state TOGGLING, polarity 0, disconnected]
> [206199.640337] CC1: 0 -> 0, CC2: 0 -> 0 [state TOGGLING, polarity 0, disconnected]
> [206199.985789] CC1: 0 -> 0, CC2: 0 -> 0 [state TOGGLING, polarity 0, disconnected]
> ...
> 
> TCPM invokes is_potential_contaminant callback to allow low level chip
> drivers to monitor TCPM state machine transitions and notify TCPM when
> the Type-C port needs to be checked for potential contaminant presence.
> TCPCs which do have the needed hardware can implement the check_contaminant
> callback which is invoked by TCPM to evaluate for presence of contaminant.
> Lower level TCPC driver can restart toggling through TCPM_PORT_CLEAN event
> when the driver detects that USB-C port is free of contaminant.
> 
> Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
> ---
> Changes since v5:
> * Updated commit message. Removed change id.
> Changes since v4:
> * None
> Changes since v3:
> * None
> Changes since V2:
> * Offloaded tcpm from maintaining disconnect_while_debouncing logic
> * to lower level maxim tcpc driver based on feedback.
> ---
>   drivers/usb/typec/tcpm/tcpm.c | 162 +++++++++-------------------------
>   include/linux/usb/tcpm.h      | 133 ++++++++++++++++++++++++++++
>   2 files changed, 177 insertions(+), 118 deletions(-)
> 
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index 904c7b4ce2f0..a138cea49612 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -33,119 +33,6 @@
>   
>   #include <uapi/linux/sched/types.h>
>   
> -#define FOREACH_STATE(S)			\
> -	S(INVALID_STATE),			\
> -	S(TOGGLING),			\
> -	S(SRC_UNATTACHED),			\
> -	S(SRC_ATTACH_WAIT),			\
> -	S(SRC_ATTACHED),			\
> -	S(SRC_STARTUP),				\
> -	S(SRC_SEND_CAPABILITIES),		\
> -	S(SRC_SEND_CAPABILITIES_TIMEOUT),	\
> -	S(SRC_NEGOTIATE_CAPABILITIES),		\
> -	S(SRC_TRANSITION_SUPPLY),		\
> -	S(SRC_READY),				\
> -	S(SRC_WAIT_NEW_CAPABILITIES),		\
> -						\
> -	S(SNK_UNATTACHED),			\
> -	S(SNK_ATTACH_WAIT),			\
> -	S(SNK_DEBOUNCED),			\
> -	S(SNK_ATTACHED),			\
> -	S(SNK_STARTUP),				\
> -	S(SNK_DISCOVERY),			\
> -	S(SNK_DISCOVERY_DEBOUNCE),		\
> -	S(SNK_DISCOVERY_DEBOUNCE_DONE),		\
> -	S(SNK_WAIT_CAPABILITIES),		\
> -	S(SNK_NEGOTIATE_CAPABILITIES),		\
> -	S(SNK_NEGOTIATE_PPS_CAPABILITIES),	\
> -	S(SNK_TRANSITION_SINK),			\
> -	S(SNK_TRANSITION_SINK_VBUS),		\
> -	S(SNK_READY),				\
> -						\
> -	S(ACC_UNATTACHED),			\
> -	S(DEBUG_ACC_ATTACHED),			\
> -	S(AUDIO_ACC_ATTACHED),			\
> -	S(AUDIO_ACC_DEBOUNCE),			\
> -						\
> -	S(HARD_RESET_SEND),			\
> -	S(HARD_RESET_START),			\
> -	S(SRC_HARD_RESET_VBUS_OFF),		\
> -	S(SRC_HARD_RESET_VBUS_ON),		\
> -	S(SNK_HARD_RESET_SINK_OFF),		\
> -	S(SNK_HARD_RESET_WAIT_VBUS),		\
> -	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),			\
> -	S(DR_SWAP_SEND),			\
> -	S(DR_SWAP_SEND_TIMEOUT),		\
> -	S(DR_SWAP_CANCEL),			\
> -	S(DR_SWAP_CHANGE_DR),			\
> -						\
> -	S(PR_SWAP_ACCEPT),			\
> -	S(PR_SWAP_SEND),			\
> -	S(PR_SWAP_SEND_TIMEOUT),		\
> -	S(PR_SWAP_CANCEL),			\
> -	S(PR_SWAP_START),			\
> -	S(PR_SWAP_SRC_SNK_TRANSITION_OFF),	\
> -	S(PR_SWAP_SRC_SNK_SOURCE_OFF),		\
> -	S(PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED), \
> -	S(PR_SWAP_SRC_SNK_SINK_ON),		\
> -	S(PR_SWAP_SNK_SRC_SINK_OFF),		\
> -	S(PR_SWAP_SNK_SRC_SOURCE_ON),		\
> -	S(PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP),    \
> -						\
> -	S(VCONN_SWAP_ACCEPT),			\
> -	S(VCONN_SWAP_SEND),			\
> -	S(VCONN_SWAP_SEND_TIMEOUT),		\
> -	S(VCONN_SWAP_CANCEL),			\
> -	S(VCONN_SWAP_START),			\
> -	S(VCONN_SWAP_WAIT_FOR_VCONN),		\
> -	S(VCONN_SWAP_TURN_ON_VCONN),		\
> -	S(VCONN_SWAP_TURN_OFF_VCONN),		\
> -						\
> -	S(FR_SWAP_SEND),			\
> -	S(FR_SWAP_SEND_TIMEOUT),		\
> -	S(FR_SWAP_SNK_SRC_TRANSITION_TO_OFF),			\
> -	S(FR_SWAP_SNK_SRC_NEW_SINK_READY),		\
> -	S(FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED),	\
> -	S(FR_SWAP_CANCEL),			\
> -						\
> -	S(SNK_TRY),				\
> -	S(SNK_TRY_WAIT),			\
> -	S(SNK_TRY_WAIT_DEBOUNCE),               \
> -	S(SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS),    \
> -	S(SRC_TRYWAIT),				\
> -	S(SRC_TRYWAIT_DEBOUNCE),		\
> -	S(SRC_TRYWAIT_UNATTACHED),		\
> -						\
> -	S(SRC_TRY),				\
> -	S(SRC_TRY_WAIT),                        \
> -	S(SRC_TRY_DEBOUNCE),			\
> -	S(SNK_TRYWAIT),				\
> -	S(SNK_TRYWAIT_DEBOUNCE),		\
> -	S(SNK_TRYWAIT_VBUS),			\
> -	S(BIST_RX),				\
> -						\
> -	S(GET_STATUS_SEND),			\
> -	S(GET_STATUS_SEND_TIMEOUT),		\
> -	S(GET_PPS_STATUS_SEND),			\
> -	S(GET_PPS_STATUS_SEND_TIMEOUT),		\
> -						\
> -	S(GET_SINK_CAP),			\
> -	S(GET_SINK_CAP_TIMEOUT),		\
> -						\
> -	S(ERROR_RECOVERY),			\
> -	S(PORT_RESET),				\
> -	S(PORT_RESET_WAIT_OFF),			\
> -						\
> -	S(AMS_START),				\
> -	S(CHUNK_NOT_SUPP)
> -
>   #define FOREACH_AMS(S)				\
>   	S(NONE_AMS),				\
>   	S(POWER_NEGOTIATION),			\
> @@ -182,13 +69,8 @@
>   	S(COUNTRY_INFO),			\
>   	S(COUNTRY_CODES)
>   
> -#define GENERATE_ENUM(e)	e
>   #define GENERATE_STRING(s)	#s
>   
> -enum tcpm_state {
> -	FOREACH_STATE(GENERATE_ENUM)
> -};
> -
>   static const char * const tcpm_states[] = {
>   	FOREACH_STATE(GENERATE_STRING)
>   };
> @@ -249,6 +131,7 @@ enum frs_typec_current {
>   #define TCPM_RESET_EVENT	BIT(2)
>   #define TCPM_FRS_EVENT		BIT(3)
>   #define TCPM_SOURCING_VBUS	BIT(4)
> +#define TCPM_PORT_CLEAN		BIT(5)
>   
>   #define LOG_BUFFER_ENTRIES	1024
>   #define LOG_BUFFER_ENTRY_SIZE	128
> @@ -483,6 +366,14 @@ struct tcpm_port {
>   	 * SNK_READY for non-pd link.
>   	 */
>   	bool slow_charger_loop;
> +
> +	/*
> +	 * When true indicates that the lower level drivers indicate potential presence
> +	 * of contaminant in the connector pins based on the tcpm state machine
> +	 * transitions.
> +	 */
> +	bool potential_contaminant;
> +
>   #ifdef CONFIG_DEBUG_FS
>   	struct dentry *dentry;
>   	struct mutex logbuffer_lock;	/* log buffer access lock */
> @@ -3904,15 +3795,26 @@ static void run_state_machine(struct tcpm_port *port)
>   	unsigned int msecs;
>   	enum tcpm_state upcoming_state;
>   
> +	if (port->tcpc->is_potential_contaminant)
> +		port->potential_contaminant =
> +			port->tcpc->is_potential_contaminant(port->tcpc, port->state);
> +
>   	port->enter_state = port->state;
>   	switch (port->state) {
>   	case TOGGLING:
>   		break;
> +	case CHECK_CONTAMINANT:
> +		port->tcpc->check_contaminant(port->tcpc);
> +		break;
>   	/* SRC states */
>   	case SRC_UNATTACHED:
>   		if (!port->non_pd_role_swap)
>   			tcpm_swap_complete(port, -ENOTCONN);
>   		tcpm_src_detach(port);
> +		if (port->potential_contaminant && port->tcpc->check_contaminant) {
> +			tcpm_set_state(port, CHECK_CONTAMINANT, 0);
> +			break;
> +		}
>   		if (tcpm_start_toggling(port, tcpm_rp_cc(port))) {
>   			tcpm_set_state(port, TOGGLING, 0);
>   			break;
> @@ -4150,6 +4052,10 @@ static void run_state_machine(struct tcpm_port *port)
>   			tcpm_swap_complete(port, -ENOTCONN);
>   		tcpm_pps_complete(port, -ENOTCONN);
>   		tcpm_snk_detach(port);
> +		if (port->potential_contaminant && port->tcpc->check_contaminant) {
> +			tcpm_set_state(port, CHECK_CONTAMINANT, 0);
> +			break;
> +		}
>   		if (tcpm_start_toggling(port, TYPEC_CC_RD)) {
>   			tcpm_set_state(port, TOGGLING, 0);
>   			break;
> @@ -4926,6 +4832,9 @@ static void _tcpm_cc_change(struct tcpm_port *port, enum typec_cc_status cc1,
>   		else if (tcpm_port_is_sink(port))
>   			tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
>   		break;
> +	case CHECK_CONTAMINANT:
> +		/* Wait for Toggling to be resumed */
> +		break;
>   	case SRC_UNATTACHED:
>   	case ACC_UNATTACHED:
>   		if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
> @@ -5425,6 +5334,10 @@ static void tcpm_pd_event_handler(struct kthread_work *work)
>   			port->vbus_source = true;
>   			_tcpm_pd_vbus_on(port);
>   		}
> +		if (events & TCPM_PORT_CLEAN) {
> +			tcpm_log(port, "port clean");
> +			tcpm_set_state(port, TOGGLING, 0);
> +		}

That sets the state to TOGGLING unconditionally, even if it not currently
CHECK_CONTAMINANT. Is that a potential problem ?

>   
>   		spin_lock(&port->pd_event_lock);
>   	}
> @@ -5477,6 +5390,19 @@ void tcpm_sourcing_vbus(struct tcpm_port *port)
>   }
>   EXPORT_SYMBOL_GPL(tcpm_sourcing_vbus);
>   
> +/*
> + * Low level tcpc drivers invoke this once the port is deemed clean to return
> + * the port to TOGGLING state.
> + */
> +void tcpm_port_clean(struct tcpm_port *port)
> +{
> +	spin_lock(&port->pd_event_lock);
> +	port->pd_events |= TCPM_PORT_CLEAN;
> +	spin_unlock(&port->pd_event_lock);
> +	kthread_queue_work(port->wq, &port->event_work);
> +}
> +EXPORT_SYMBOL_GPL(tcpm_port_clean);
> +
>   static void tcpm_enable_frs_work(struct kthread_work *work)
>   {
>   	struct tcpm_port *port = container_of(work, struct tcpm_port, enable_frs);
> diff --git a/include/linux/usb/tcpm.h b/include/linux/usb/tcpm.h
> index bffc8d3e14ad..9cf16372a6e4 100644
> --- a/include/linux/usb/tcpm.h
> +++ b/include/linux/usb/tcpm.h
> @@ -10,6 +10,126 @@
>   #include <linux/usb/typec.h>
>   #include "pd.h"
>   
> +#define FOREACH_STATE(S)			\
> +	S(INVALID_STATE),			\
> +	S(TOGGLING),			\
> +	S(CHECK_CONTAMINANT),			\
> +	S(SRC_UNATTACHED),			\
> +	S(SRC_ATTACH_WAIT),			\
> +	S(SRC_ATTACHED),			\
> +	S(SRC_STARTUP),				\
> +	S(SRC_SEND_CAPABILITIES),		\
> +	S(SRC_SEND_CAPABILITIES_TIMEOUT),	\
> +	S(SRC_NEGOTIATE_CAPABILITIES),		\
> +	S(SRC_TRANSITION_SUPPLY),		\
> +	S(SRC_READY),				\
> +	S(SRC_WAIT_NEW_CAPABILITIES),		\
> +						\
> +	S(SNK_UNATTACHED),			\
> +	S(SNK_ATTACH_WAIT),			\
> +	S(SNK_DEBOUNCED),			\
> +	S(SNK_ATTACHED),			\
> +	S(SNK_STARTUP),				\
> +	S(SNK_DISCOVERY),			\
> +	S(SNK_DISCOVERY_DEBOUNCE),		\
> +	S(SNK_DISCOVERY_DEBOUNCE_DONE),		\
> +	S(SNK_WAIT_CAPABILITIES),		\
> +	S(SNK_NEGOTIATE_CAPABILITIES),		\
> +	S(SNK_NEGOTIATE_PPS_CAPABILITIES),	\
> +	S(SNK_TRANSITION_SINK),			\
> +	S(SNK_TRANSITION_SINK_VBUS),		\
> +	S(SNK_READY),				\
> +						\
> +	S(ACC_UNATTACHED),			\
> +	S(DEBUG_ACC_ATTACHED),			\
> +	S(AUDIO_ACC_ATTACHED),			\
> +	S(AUDIO_ACC_DEBOUNCE),			\
> +						\
> +	S(HARD_RESET_SEND),			\
> +	S(HARD_RESET_START),			\
> +	S(SRC_HARD_RESET_VBUS_OFF),		\
> +	S(SRC_HARD_RESET_VBUS_ON),		\
> +	S(SNK_HARD_RESET_SINK_OFF),		\
> +	S(SNK_HARD_RESET_WAIT_VBUS),		\
> +	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),			\
> +	S(DR_SWAP_SEND),			\
> +	S(DR_SWAP_SEND_TIMEOUT),		\
> +	S(DR_SWAP_CANCEL),			\
> +	S(DR_SWAP_CHANGE_DR),			\
> +						\
> +	S(PR_SWAP_ACCEPT),			\
> +	S(PR_SWAP_SEND),			\
> +	S(PR_SWAP_SEND_TIMEOUT),		\
> +	S(PR_SWAP_CANCEL),			\
> +	S(PR_SWAP_START),			\
> +	S(PR_SWAP_SRC_SNK_TRANSITION_OFF),	\
> +	S(PR_SWAP_SRC_SNK_SOURCE_OFF),		\
> +	S(PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED), \
> +	S(PR_SWAP_SRC_SNK_SINK_ON),		\
> +	S(PR_SWAP_SNK_SRC_SINK_OFF),		\
> +	S(PR_SWAP_SNK_SRC_SOURCE_ON),		\
> +	S(PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP),    \
> +						\
> +	S(VCONN_SWAP_ACCEPT),			\
> +	S(VCONN_SWAP_SEND),			\
> +	S(VCONN_SWAP_SEND_TIMEOUT),		\
> +	S(VCONN_SWAP_CANCEL),			\
> +	S(VCONN_SWAP_START),			\
> +	S(VCONN_SWAP_WAIT_FOR_VCONN),		\
> +	S(VCONN_SWAP_TURN_ON_VCONN),		\
> +	S(VCONN_SWAP_TURN_OFF_VCONN),		\
> +						\
> +	S(FR_SWAP_SEND),			\
> +	S(FR_SWAP_SEND_TIMEOUT),		\
> +	S(FR_SWAP_SNK_SRC_TRANSITION_TO_OFF),			\
> +	S(FR_SWAP_SNK_SRC_NEW_SINK_READY),		\
> +	S(FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED),	\
> +	S(FR_SWAP_CANCEL),			\
> +						\
> +	S(SNK_TRY),				\
> +	S(SNK_TRY_WAIT),			\
> +	S(SNK_TRY_WAIT_DEBOUNCE),               \
> +	S(SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS),    \
> +	S(SRC_TRYWAIT),				\
> +	S(SRC_TRYWAIT_DEBOUNCE),		\
> +	S(SRC_TRYWAIT_UNATTACHED),		\
> +						\
> +	S(SRC_TRY),				\
> +	S(SRC_TRY_WAIT),                        \
> +	S(SRC_TRY_DEBOUNCE),			\
> +	S(SNK_TRYWAIT),				\
> +	S(SNK_TRYWAIT_DEBOUNCE),		\
> +	S(SNK_TRYWAIT_VBUS),			\
> +	S(BIST_RX),				\
> +						\
> +	S(GET_STATUS_SEND),			\
> +	S(GET_STATUS_SEND_TIMEOUT),		\
> +	S(GET_PPS_STATUS_SEND),			\
> +	S(GET_PPS_STATUS_SEND_TIMEOUT),		\
> +						\
> +	S(GET_SINK_CAP),			\
> +	S(GET_SINK_CAP_TIMEOUT),		\
> +						\
> +	S(ERROR_RECOVERY),			\
> +	S(PORT_RESET),				\
> +	S(PORT_RESET_WAIT_OFF),			\
> +						\
> +	S(AMS_START),				\
> +	S(CHUNK_NOT_SUPP)
> +
> +#define GENERATE_ENUM(e)	e
> +
> +enum tcpm_state {
> +	FOREACH_STATE(GENERATE_ENUM)
> +};
> +

Sorry for not bringing it up earlier; I have been struggling with it all along,
and I could not decide if I should bring it up or not.

I really don't feel comfortable with exporting states outside tcpm.
Is this really necessary ? The only use seems to be

+       if ((tcpm_prev_state == SRC_ATTACH_WAIT && current_state == SRC_UNATTACHED) ||
+           (tcpm_prev_state == SNK_ATTACH_WAIT && current_state == SNK_UNATTACHED))

Plus, of course, the CHECK_CONTAMINANT state.

Is there reason to believe that the relevant state transitions would be different
for other chips ? If not, would it possibly make sense to move this check
into the state machine ?

>   enum typec_cc_status {
>   	TYPEC_CC_OPEN,
>   	TYPEC_CC_RA,
> @@ -114,6 +234,16 @@ enum tcpm_transmit_type {
>    *              Optional; The USB Communications Capable bit indicates if port 
>    *              partner is capable of communication over the USB data lines
>    *              (e.g. D+/- or SS Tx/Rx). Called to notify the status of the bit.
> + * @check_contaminant:
> + *		Optional; The callback is invoked when chiplevel drivers indicated
> + *		that the USB port needs to be checked for contaminant presence.
> + *		Chip level drivers are expected to check for contaminant and call
> + *		tcpm_clean_port when the port is clean to put the port back into
> + *		toggling state.
> + * @is_potential_contaminant:
> + *		Optional; TCPM invokes the callback for every TCPM state machine
> + *		transition. Chiplevel drivers can monitor the state machine
> + *		transitions to flag for potential contaminant presence.

I kind of dislike the repeated checks for those callbacks in the state machine.
Does it make any sense to have one of those callbacks but not the other ?

Because if not it might make sense to check in the registration function
if either both are NULL or both are set, and then drop most of the checks
in the state machine handler.

Thanks,
Guenter

>    */
>   struct tcpc_dev {
>   	struct fwnode_handle *fwnode;
> @@ -148,6 +278,8 @@ struct tcpc_dev {
>   						 bool pps_active, u32 requested_vbus_voltage);
>   	bool (*is_vbus_vsafe0v)(struct tcpc_dev *dev);
>   	void (*set_partner_usb_comm_capable)(struct tcpc_dev *dev, bool enable);
> +	void (*check_contaminant)(struct tcpc_dev *dev);
> +	bool (*is_potential_contaminant)(struct tcpc_dev *dev, enum tcpm_state current_state);
>   };
>   
>   struct tcpm_port;
> @@ -165,5 +297,6 @@ void tcpm_pd_transmit_complete(struct tcpm_port *port,
>   			       enum tcpm_transmit_status status);
>   void tcpm_pd_hard_reset(struct tcpm_port *port);
>   void tcpm_tcpc_reset(struct tcpm_port *port);
> +void tcpm_port_clean(struct tcpm_port *port);
>   
>   #endif /* __LINUX_USB_TCPM_H */
> 
> base-commit: 1524ceb14dd5ebd6f724d993c5ec1a9a8d445d8e