diff options
Diffstat (limited to 'drivers/usb/tcpm/tcpm.c')
| -rw-r--r-- | drivers/usb/tcpm/tcpm.c | 2288 |
1 files changed, 2288 insertions, 0 deletions
diff --git a/drivers/usb/tcpm/tcpm.c b/drivers/usb/tcpm/tcpm.c new file mode 100644 index 00000000000..0aee57cb2f4 --- /dev/null +++ b/drivers/usb/tcpm/tcpm.c @@ -0,0 +1,2288 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright 2015-2017 Google, Inc + * + * USB Power Delivery protocol stack. + */ + +#include <asm/gpio.h> +#include <asm/io.h> +#include <dm.h> +#include <dm/device_compat.h> +#include <dm/device-internal.h> +#include <dm/devres.h> +#include <linux/compat.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/iopoll.h> +#include <time.h> +#include <usb/tcpm.h> +#include "tcpm-internal.h" + +DECLARE_GLOBAL_DATA_PTR; + +const char * const tcpm_states[] = { + FOREACH_TCPM_STATE(GENERATE_TCPM_STRING) +}; + +const char * const typec_pd_rev_name[] = { + [PD_REV10] = "rev1", + [PD_REV20] = "rev2", + [PD_REV30] = "rev3", +}; + +const char * const typec_role_name[] = { + [TYPEC_SINK] = "sink", + [TYPEC_SOURCE] = "source", +}; + +const char * const typec_data_role_name[] = { + [TYPEC_DEVICE] = "device", + [TYPEC_HOST] = "host", +}; + +const char * const typec_orientation_name[] = { + [TYPEC_ORIENTATION_NONE] = "none", + [TYPEC_ORIENTATION_NORMAL] = "normal", + [TYPEC_ORIENTATION_REVERSE] = "reverse", +}; + +const char * const typec_cc_status_name[] = { + [TYPEC_CC_OPEN] = "open", + [TYPEC_CC_RA] = "ra", + [TYPEC_CC_RD] = "rd", + [TYPEC_CC_RP_DEF] = "rp-def", + [TYPEC_CC_RP_1_5] = "rp-1.5", + [TYPEC_CC_RP_3_0] = "rp-3.0", +}; + +static inline bool tcpm_cc_is_sink(enum typec_cc_status cc) +{ + return cc == TYPEC_CC_RP_DEF || + cc == TYPEC_CC_RP_1_5 || + cc == TYPEC_CC_RP_3_0; +} + +static inline bool tcpm_port_is_sink(struct tcpm_port *port) +{ + bool cc1_is_snk = tcpm_cc_is_sink(port->cc1); + bool cc2_is_snk = tcpm_cc_is_sink(port->cc2); + + return (cc1_is_snk && !cc2_is_snk) || + (cc2_is_snk && !cc1_is_snk); +} + +static inline bool tcpm_cc_is_source(enum typec_cc_status cc) +{ + return cc == TYPEC_CC_RD; +} + +static inline bool tcpm_port_is_source(struct tcpm_port *port) +{ + bool cc1_is_src = tcpm_cc_is_source(port->cc1); + bool cc2_is_src = tcpm_cc_is_source(port->cc2); + + return (cc1_is_src && !cc2_is_src) || + (cc2_is_src && !cc1_is_src); +} + +static inline bool tcpm_try_src(struct tcpm_port *port) +{ + return port->try_role == TYPEC_SOURCE && + port->port_type == TYPEC_PORT_DRP; +} + +static inline void tcpm_reset_event_cnt(struct udevice *dev) +{ + struct tcpm_port *port = dev_get_uclass_plat(dev); + + port->poll_event_cnt = 0; +} + +static enum tcpm_state tcpm_default_state(struct tcpm_port *port) +{ + if (port->port_type == TYPEC_PORT_DRP) { + if (port->try_role == TYPEC_SINK) + return SNK_UNATTACHED; + else if (port->try_role == TYPEC_SOURCE) + return SRC_UNATTACHED; + } else if (port->port_type == TYPEC_PORT_SNK) { + return SNK_UNATTACHED; + } + return SRC_UNATTACHED; +} + +static bool tcpm_port_is_disconnected(struct tcpm_port *port) +{ + return (!port->attached && port->cc1 == TYPEC_CC_OPEN && + port->cc2 == TYPEC_CC_OPEN) || + (port->attached && ((port->polarity == TYPEC_POLARITY_CC1 && + port->cc1 == TYPEC_CC_OPEN) || + (port->polarity == TYPEC_POLARITY_CC2 && + port->cc2 == TYPEC_CC_OPEN))); +} + +static void tcpm_set_cc(struct udevice *dev, enum typec_cc_status cc) +{ + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev); + struct tcpm_port *port = dev_get_uclass_plat(dev); + + dev_dbg(dev, "TCPM: set cc = %d\n", cc); + port->cc_req = cc; + drvops->set_cc(dev, cc); +} + +/* + * Determine RP value to set based on maximum current supported + * by a port if configured as source. + * Returns CC value to report to link partner. + */ +static enum typec_cc_status tcpm_rp_cc(struct tcpm_port *port) +{ + const u32 *src_pdo = port->src_pdo; + int nr_pdo = port->nr_src_pdo; + int i; + + /* + * Search for first entry with matching voltage. + * It should report the maximum supported current. + */ + for (i = 0; i < nr_pdo; i++) { + const u32 pdo = src_pdo[i]; + + if (pdo_type(pdo) == PDO_TYPE_FIXED && + pdo_fixed_voltage(pdo) == 5000) { + unsigned int curr = pdo_max_current(pdo); + + if (curr >= 3000) + return TYPEC_CC_RP_3_0; + else if (curr >= 1500) + return TYPEC_CC_RP_1_5; + return TYPEC_CC_RP_DEF; + } + } + + return TYPEC_CC_RP_DEF; +} + +static void tcpm_check_and_run_delayed_work(struct udevice *dev); + +static bool tcpm_transmit_helper(struct udevice *dev) +{ + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev); + struct tcpm_port *port = dev_get_uclass_plat(dev); + + drvops->poll_event(dev); + udelay(500); + tcpm_check_and_run_delayed_work(dev); + return port->tx_complete; +} + +static int tcpm_pd_transmit(struct udevice *dev, + enum tcpm_transmit_type type, + const struct pd_message *msg) +{ + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev); + struct tcpm_port *port = dev_get_uclass_plat(dev); + u32 timeout_us = PD_T_TCPC_TX_TIMEOUT * 1000; + bool tx_complete; + int ret; + + if (msg) + dev_dbg(dev, "TCPM: PD TX, header: %#x\n", + le16_to_cpu(msg->header)); + else + dev_dbg(dev, "TCPM: PD TX, type: %#x\n", type); + + port->tx_complete = false; + ret = drvops->pd_transmit(dev, type, msg, port->negotiated_rev); + if (ret < 0) + return ret; + + /* + * At this point we basically need to block until the TCPM controller + * returns successful transmission. Since this is usually done using + * the generic interrupt status bits, we poll for any events. That + * will clear the interrupt status, so we also need to process any + * of the incoming events. This means we will do more processing and + * thus let's give everything a bit more time. + */ + timeout_us *= 5; + ret = read_poll_timeout(tcpm_transmit_helper, tx_complete, + !tx_complete, false, timeout_us, dev); + if (ret < 0) { + dev_err(dev, "TCPM: PD transmit data failed: %d\n", ret); + return ret; + } + + switch (port->tx_status) { + case TCPC_TX_SUCCESS: + port->message_id = (port->message_id + 1) & PD_HEADER_ID_MASK; + break; + case TCPC_TX_DISCARDED: + ret = -EAGAIN; + break; + case TCPC_TX_FAILED: + default: + ret = -EIO; + break; + } + + return ret; +} + +void tcpm_pd_transmit_complete(struct udevice *dev, + enum tcpm_transmit_status status) +{ + struct tcpm_port *port = dev_get_uclass_plat(dev); + + dev_dbg(dev, "TCPM: PD TX complete, status: %u\n", status); + tcpm_reset_event_cnt(dev); + port->tx_status = status; + port->tx_complete = true; +} + +static int tcpm_set_polarity(struct udevice *dev, + enum typec_cc_polarity polarity) +{ + struct tcpm_port *port = dev_get_uclass_plat(dev); + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev); + int ret; + + dev_dbg(dev, "TCPM: set polarity = %d\n", polarity); + + if (drvops->set_polarity) { + ret = drvops->set_polarity(dev, polarity); + if (ret < 0) + return ret; + } + + port->polarity = polarity; + + return 0; +} + +static int tcpm_set_vconn(struct udevice *dev, bool enable) +{ + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev); + struct tcpm_port *port = dev_get_uclass_plat(dev); + int ret; + + dev_dbg(dev, "TCPM: set vconn = %d\n", enable); + + ret = drvops->set_vconn(dev, enable); + if (!ret) + port->vconn_role = enable ? TYPEC_SOURCE : TYPEC_SINK; + + return ret; +} + +static inline u32 tcpm_get_current_limit(struct tcpm_port *port) +{ + switch (port->polarity ? port->cc2 : port->cc1) { + case TYPEC_CC_RP_1_5: + return 1500; + case TYPEC_CC_RP_3_0: + return 3000; + case TYPEC_CC_RP_DEF: + default: + return 0; + } +} + +static int tcpm_set_current_limit(struct udevice *dev, u32 max_ma, u32 mv) +{ + struct tcpm_port *port = dev_get_uclass_plat(dev); + int ret = -EOPNOTSUPP; + + dev_info(dev, "TCPM: set voltage limit = %u mV\n", mv); + dev_info(dev, "TCPM: set current limit = %u mA\n", max_ma); + + port->supply_voltage = mv; + port->current_limit = max_ma; + + return ret; +} + +static int tcpm_set_attached_state(struct udevice *dev, bool attached) +{ + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev); + struct tcpm_port *port = dev_get_uclass_plat(dev); + + return drvops->set_roles(dev, attached, port->pwr_role, + port->data_role); +} + +static int tcpm_set_roles(struct udevice *dev, bool attached, + enum typec_role role, enum typec_data_role data) +{ + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev); + struct tcpm_port *port = dev_get_uclass_plat(dev); + int ret; + + ret = drvops->set_roles(dev, attached, role, data); + if (ret < 0) + return ret; + + port->pwr_role = role; + port->data_role = data; + + return 0; +} + +static int tcpm_pd_send_source_caps(struct udevice *dev) +{ + struct tcpm_port *port = dev_get_uclass_plat(dev); + struct pd_message msg; + int i; + + memset(&msg, 0, sizeof(msg)); + + if (!port->nr_src_pdo) { + /* No source capabilities defined, sink only */ + msg.header = PD_HEADER_LE(PD_CTRL_REJECT, + port->pwr_role, + port->data_role, + port->negotiated_rev, + port->message_id, 0); + } else { + msg.header = PD_HEADER_LE(PD_DATA_SOURCE_CAP, + port->pwr_role, + port->data_role, + port->negotiated_rev, + port->message_id, + port->nr_src_pdo); + } + + for (i = 0; i < port->nr_src_pdo; i++) + msg.payload[i] = cpu_to_le32(port->src_pdo[i]); + + return tcpm_pd_transmit(dev, TCPC_TX_SOP, &msg); +} + +static int tcpm_pd_send_sink_caps(struct udevice *dev) +{ + struct tcpm_port *port = dev_get_uclass_plat(dev); + struct pd_message msg; + unsigned int i; + + memset(&msg, 0, sizeof(msg)); + + if (!port->nr_snk_pdo) { + /* No sink capabilities defined, source only */ + msg.header = PD_HEADER_LE(PD_CTRL_REJECT, + port->pwr_role, + port->data_role, + port->negotiated_rev, + port->message_id, 0); + } else { + msg.header = PD_HEADER_LE(PD_DATA_SINK_CAP, + port->pwr_role, + port->data_role, + port->negotiated_rev, + port->message_id, + port->nr_snk_pdo); + } + + for (i = 0; i < port->nr_snk_pdo; i++) + msg.payload[i] = cpu_to_le32(port->snk_pdo[i]); + + return tcpm_pd_transmit(dev, TCPC_TX_SOP, &msg); +} + +static void tcpm_state_machine(struct udevice *dev); + +static inline void tcpm_timer_uninit(struct udevice *dev) +{ + struct tcpm_port *port = dev_get_uclass_plat(dev); + + port->delay_target = 0; +} + +static void tcpm_timer_init(struct udevice *dev, uint32_t ms) +{ + struct tcpm_port *port = dev_get_uclass_plat(dev); + unsigned long time_us = ms * 1000; + + port->delay_target = timer_get_us() + time_us; +} + +static void tcpm_check_and_run_delayed_work(struct udevice *dev) +{ + struct tcpm_port *port = dev_get_uclass_plat(dev); + + /* no delayed state changes scheduled */ + if (port->delay_target == 0) + return; + + /* it's not yet time */ + if (timer_get_us() < port->delay_target) + return; + + tcpm_timer_uninit(dev); + tcpm_state_machine(dev); +} + +static void mod_tcpm_delayed_work(struct udevice *dev, unsigned int delay_ms) +{ + if (delay_ms) { + tcpm_timer_init(dev, delay_ms); + } else { + tcpm_timer_uninit(dev); + tcpm_state_machine(dev); + } +} + +static void tcpm_set_state(struct udevice *dev, enum tcpm_state state, + unsigned int delay_ms) +{ + struct tcpm_port *port = dev_get_uclass_plat(dev); + + if (delay_ms) { + dev_dbg(dev, "TCPM: pending state change %s -> %s @ %u ms [%s]\n", + tcpm_states[port->state], tcpm_states[state], delay_ms, + typec_pd_rev_name[port->negotiated_rev]); + port->delayed_state = state; + mod_tcpm_delayed_work(dev, delay_ms); + port->delay_ms = delay_ms; + } else { + dev_dbg(dev, "TCPM: state change %s -> %s\n", + tcpm_states[port->state], tcpm_states[state]); + port->delayed_state = INVALID_STATE; + port->prev_state = port->state; + port->state = state; + /* + * Don't re-queue the state machine work item if we're currently + * in the state machine and we're immediately changing states. + * tcpm_state_machine_work() will continue running the state + * machine. + */ + if (!port->state_machine_running) + mod_tcpm_delayed_work(dev, 0); + } +} + +static void tcpm_set_state_cond(struct udevice *dev, enum tcpm_state state, + unsigned int delay_ms) +{ + struct tcpm_port *port = dev_get_uclass_plat(dev); + + if (port->enter_state == port->state) + tcpm_set_state(dev, state, delay_ms); + else + dev_dbg(dev, "TCPM: skipped %sstate change %s -> %s [%u ms], context state %s [%s]\n", + delay_ms ? "delayed " : "", + tcpm_states[port->state], tcpm_states[state], + delay_ms, tcpm_states[port->enter_state], + typec_pd_rev_name[port->negotiated_rev]); +} + +static void tcpm_queue_message(struct udevice *dev, + enum pd_msg_request message) +{ + struct tcpm_port *port = dev_get_uclass_plat(dev); + + port->queued_message = message; + mod_tcpm_delayed_work(dev, 0); +} + +enum pdo_err { + PDO_NO_ERR, + PDO_ERR_NO_VSAFE5V, + PDO_ERR_VSAFE5V_NOT_FIRST, + PDO_ERR_PDO_TYPE_NOT_IN_ORDER, + PDO_ERR_FIXED_NOT_SORTED, + PDO_ERR_VARIABLE_BATT_NOT_SORTED, + PDO_ERR_DUPE_PDO, + PDO_ERR_PPS_APDO_NOT_SORTED, + PDO_ERR_DUPE_PPS_APDO, +}; + +static const char * const pdo_err_msg[] = { + [PDO_ERR_NO_VSAFE5V] = + " err: source/sink caps should at least have vSafe5V", + [PDO_ERR_VSAFE5V_NOT_FIRST] = + " err: vSafe5V Fixed Supply Object Shall always be the first object", + [PDO_ERR_PDO_TYPE_NOT_IN_ORDER] = + " err: PDOs should be in the following order: Fixed; Battery; Variable", + [PDO_ERR_FIXED_NOT_SORTED] = + " err: Fixed supply pdos should be in increasing order of their fixed voltage", + [PDO_ERR_VARIABLE_BATT_NOT_SORTED] = + " err: Variable/Battery supply pdos should be in increasing order of their minimum voltage", + [PDO_ERR_DUPE_PDO] = + " err: Variable/Batt supply pdos cannot have same min/max voltage", + [PDO_ERR_PPS_APDO_NOT_SORTED] = + " err: Programmable power supply apdos should be in increasing order of their maximum voltage", + [PDO_ERR_DUPE_PPS_APDO] = + " err: Programmable power supply apdos cannot have same min/max voltage and max current", +}; + +static enum pdo_err tcpm_caps_err(struct udevice *dev, const u32 *pdo, + unsigned int nr_pdo) +{ + unsigned int i; + + /* Should at least contain vSafe5v */ + if (nr_pdo < 1) + return PDO_ERR_NO_VSAFE5V; + + /* The vSafe5V Fixed Supply Object Shall always be the first object */ + if (pdo_type(pdo[0]) != PDO_TYPE_FIXED || + pdo_fixed_voltage(pdo[0]) != VSAFE5V) + return PDO_ERR_VSAFE5V_NOT_FIRST; + + for (i = 1; i < nr_pdo; i++) { + if (pdo_type(pdo[i]) < pdo_type(pdo[i - 1])) { + return PDO_ERR_PDO_TYPE_NOT_IN_ORDER; + } else if (pdo_type(pdo[i]) == pdo_type(pdo[i - 1])) { + enum pd_pdo_type type = pdo_type(pdo[i]); + + switch (type) { + /* + * The remaining Fixed Supply Objects, if + * present, shall be sent in voltage order; + * lowest to highest. + */ + case PDO_TYPE_FIXED: + if (pdo_fixed_voltage(pdo[i]) <= + pdo_fixed_voltage(pdo[i - 1])) + return PDO_ERR_FIXED_NOT_SORTED; + break; + /* + * The Battery Supply Objects and Variable + * supply, if present shall be sent in Minimum + * Voltage order; lowest to highest. + */ + case PDO_TYPE_VAR: + case PDO_TYPE_BATT: + if (pdo_min_voltage(pdo[i]) < + pdo_min_voltage(pdo[i - 1])) + return PDO_ERR_VARIABLE_BATT_NOT_SORTED; + else if ((pdo_min_voltage(pdo[i]) == + pdo_min_voltage(pdo[i - 1])) && + (pdo_max_voltage(pdo[i]) == + pdo_max_voltage(pdo[i - 1]))) + return PDO_ERR_DUPE_PDO; + break; + /* + * The Programmable Power Supply APDOs, if present, + * shall be sent in Maximum Voltage order; + * lowest to highest. + */ + case PDO_TYPE_APDO: + if (pdo_apdo_type(pdo[i]) != APDO_TYPE_PPS) + break; + + if (pdo_pps_apdo_max_voltage(pdo[i]) < + pdo_pps_apdo_max_voltage(pdo[i - 1])) + return PDO_ERR_PPS_APDO_NOT_SORTED; + else if (pdo_pps_apdo_min_voltage(pdo[i]) == + pdo_pps_apdo_min_voltage(pdo[i - 1]) && + pdo_pps_apdo_max_voltage(pdo[i]) == + pdo_pps_apdo_max_voltage(pdo[i - 1]) && + pdo_pps_apdo_max_current(pdo[i]) == + pdo_pps_apdo_max_current(pdo[i - 1])) + return PDO_ERR_DUPE_PPS_APDO; + break; + default: + dev_err(dev, "TCPM: Unknown pdo type\n"); + } + } + } + + return PDO_NO_ERR; +} + +static int tcpm_validate_caps(struct udevice *dev, const u32 *pdo, + unsigned int nr_pdo) +{ + enum pdo_err err_index = tcpm_caps_err(dev, pdo, nr_pdo); + + if (err_index != PDO_NO_ERR) { + dev_err(dev, "TCPM:%s\n", pdo_err_msg[err_index]); + return -EINVAL; + } + + return 0; +} + +/* + * PD (data, control) command handling functions + */ +static inline enum tcpm_state ready_state(struct tcpm_port *port) +{ + if (port->pwr_role == TYPEC_SOURCE) + return SRC_READY; + else + return SNK_READY; +} + +static void tcpm_pd_data_request(struct udevice *dev, + const struct pd_message *msg) +{ + enum pd_data_msg_type type = pd_header_type_le(msg->header); + struct tcpm_port *port = dev_get_uclass_plat(dev); + unsigned int cnt = pd_header_cnt_le(msg->header); + unsigned int rev = pd_header_rev_le(msg->header); + unsigned int i; + + switch (type) { + case PD_DATA_SOURCE_CAP: + for (i = 0; i < cnt; i++) + port->source_caps[i] = le32_to_cpu(msg->payload[i]); + + port->nr_source_caps = cnt; + + tcpm_validate_caps(dev, port->source_caps, + port->nr_source_caps); + + /* + * Adjust revision in subsequent message headers, as required, + * to comply with 6.2.1.1.5 of the USB PD 3.0 spec. We don't + * support Rev 1.0 so just do nothing in that scenario. + */ + if (rev == PD_REV10) + break; + + if (rev < PD_MAX_REV) + port->negotiated_rev = rev; + + if ((pdo_type(port->source_caps[0]) == PDO_TYPE_FIXED) && + (port->source_caps[0] & PDO_FIXED_DUAL_ROLE) && + (port->source_caps[0] & PDO_FIXED_DATA_SWAP)) { + /* Dual role power and data, eg: self-powered Type-C */ + port->wait_dr_swap_message = true; + } else { + /* Non-Dual role power, eg: adapter */ + port->wait_dr_swap_message = false; + } + + /* + * This message may be received even if VBUS is not + * present. This is quite unexpected; see USB PD + * specification, sections 8.3.3.6.3.1 and 8.3.3.6.3.2. + * However, at the same time, we must be ready to + * receive this message and respond to it 15ms after + * receiving PS_RDY during power swap operations, no matter + * if VBUS is available or not (USB PD specification, + * section 6.5.9.2). + * So we need to accept the message either way, + * but be prepared to keep waiting for VBUS after it was + * handled. + */ + tcpm_set_state(dev, SNK_NEGOTIATE_CAPABILITIES, 0); + break; + case PD_DATA_REQUEST: + /* + * Adjust revision in subsequent message headers, as required, + * to comply with 6.2.1.1.5 of the USB PD 3.0 spec. We don't + * support Rev 1.0 so just reject in that scenario. + */ + if (rev == PD_REV10) { + tcpm_queue_message(dev, PD_MSG_CTRL_REJECT); + break; + } + + if (rev < PD_MAX_REV) + port->negotiated_rev = rev; + + port->sink_request = le32_to_cpu(msg->payload[0]); + + tcpm_set_state(dev, SRC_NEGOTIATE_CAPABILITIES, 0); + break; + case PD_DATA_SINK_CAP: + /* We don't do anything with this at the moment... */ + for (i = 0; i < cnt; i++) + port->sink_caps[i] = le32_to_cpu(msg->payload[i]); + + port->nr_sink_caps = cnt; + break; + default: + break; + } +} + +static void tcpm_pd_ctrl_request(struct udevice *dev, + const struct pd_message *msg) +{ + enum pd_ctrl_msg_type type = pd_header_type_le(msg->header); + struct tcpm_port *port = dev_get_uclass_plat(dev); + enum tcpm_state next_state; + + switch (type) { + case PD_CTRL_GOOD_CRC: + case PD_CTRL_PING: + break; + case PD_CTRL_GET_SOURCE_CAP: + switch (port->state) { + case SRC_READY: + case SNK_READY: + tcpm_queue_message(dev, PD_MSG_DATA_SOURCE_CAP); + break; + default: + tcpm_queue_message(dev, PD_MSG_CTRL_REJECT); + break; + } + break; + case PD_CTRL_GET_SINK_CAP: + switch (port->state) { + case SRC_READY: + case SNK_READY: + tcpm_queue_message(dev, PD_MSG_DATA_SINK_CAP); + break; + default: + tcpm_queue_message(dev, PD_MSG_CTRL_REJECT); + break; + } + break; + case PD_CTRL_GOTO_MIN: + break; + case PD_CTRL_PS_RDY: + switch (port->state) { + case SNK_TRANSITION_SINK: + if (port->vbus_present) { + tcpm_set_current_limit(dev, + port->req_current_limit, + port->req_supply_voltage); + port->explicit_contract = true; + tcpm_set_state(dev, SNK_READY, 0); + } else { + /* + * Seen after power swap. Keep waiting for VBUS + * in a transitional state. + */ + tcpm_set_state(dev, + SNK_TRANSITION_SINK_VBUS, 0); + } + break; + default: + break; + } + break; + case PD_CTRL_REJECT: + case PD_CTRL_WAIT: + case PD_CTRL_NOT_SUPP: + switch (port->state) { + case SNK_NEGOTIATE_CAPABILITIES: + /* USB PD specification, Figure 8-43 */ + if (port->explicit_contract) + next_state = SNK_READY; + else + next_state = SNK_WAIT_CAPABILITIES; + + tcpm_set_state(dev, next_state, 0); + break; + default: + break; + } + break; + case PD_CTRL_ACCEPT: + switch (port->state) { + case SNK_NEGOTIATE_CAPABILITIES: + tcpm_set_state(dev, SNK_TRANSITION_SINK, 0); + break; + 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(dev, next_state, 0); + break; + default: + break; + } + break; + case PD_CTRL_SOFT_RESET: + tcpm_set_state(dev, SOFT_RESET, 0); + break; + case PD_CTRL_DR_SWAP: + if (port->port_type != TYPEC_PORT_DRP) { + tcpm_queue_message(dev, PD_MSG_CTRL_REJECT); + break; + } + /* + * 6.3.9: If an alternate mode is active, a request to swap + * alternate modes shall trigger a port reset. + */ + switch (port->state) { + case SRC_READY: + case SNK_READY: + tcpm_set_state(dev, DR_SWAP_ACCEPT, 0); + break; + default: + tcpm_queue_message(dev, PD_MSG_CTRL_WAIT); + break; + } + break; + case PD_CTRL_PR_SWAP: + case PD_CTRL_VCONN_SWAP: + case PD_CTRL_GET_SOURCE_CAP_EXT: + case PD_CTRL_GET_STATUS: + case PD_CTRL_FR_SWAP: + case PD_CTRL_GET_PPS_STATUS: + case PD_CTRL_GET_COUNTRY_CODES: + /* Currently not supported */ + dev_err(dev, "TCPM: Currently not supported type %#x\n", type); + tcpm_queue_message(dev, PD_MSG_CTRL_NOT_SUPP); + break; + default: + dev_err(dev, "TCPM: Unrecognized ctrl message type %#x\n", type); + break; + } +} + +static void tcpm_pd_rx_handler(struct udevice *dev, + const struct pd_message *msg) +{ + struct tcpm_port *port = dev_get_uclass_plat(dev); + unsigned int cnt = pd_header_cnt_le(msg->header); + bool remote_is_host, local_is_host; + + dev_dbg(dev, "TCPM: PD RX, header: %#x [%d]\n", + le16_to_cpu(msg->header), port->attached); + + if (port->attached) { + enum pd_ctrl_msg_type type = pd_header_type_le(msg->header); + unsigned int msgid = pd_header_msgid_le(msg->header); + + /* + * USB PD standard, 6.6.1.2: + * "... if MessageID value in a received Message is the + * same as the stored value, the receiver shall return a + * GoodCRC Message with that MessageID value and drop + * the Message (this is a retry of an already received + * Message). Note: this shall not apply to the Soft_Reset + * Message which always has a MessageID value of zero." + */ + if (msgid == port->rx_msgid && type != PD_CTRL_SOFT_RESET) + return; + port->rx_msgid = msgid; + + /* + * If both ends believe to be DFP/host, we have a data role + * mismatch. + */ + remote_is_host = !!(le16_to_cpu(msg->header) & PD_HEADER_DATA_ROLE); + local_is_host = port->data_role == TYPEC_HOST; + if (remote_is_host == local_is_host) { + dev_err(dev, "TCPM: data role mismatch, initiating error recovery\n"); + tcpm_set_state(dev, ERROR_RECOVERY, 0); + } else { + if (cnt) + tcpm_pd_data_request(dev, msg); + else + tcpm_pd_ctrl_request(dev, msg); + } + } +} + +void tcpm_pd_receive(struct udevice *dev, const struct pd_message *msg) +{ + tcpm_reset_event_cnt(dev); + tcpm_pd_rx_handler(dev, msg); +} + +static int tcpm_pd_send_control(struct udevice *dev, + enum pd_ctrl_msg_type type) +{ + struct tcpm_port *port = dev_get_uclass_plat(dev); + struct pd_message msg; + + memset(&msg, 0, sizeof(msg)); + msg.header = PD_HEADER_LE(type, port->pwr_role, + port->data_role, + port->negotiated_rev, + port->message_id, 0); + + return tcpm_pd_transmit(dev, TCPC_TX_SOP, &msg); +} + +/* + * Send queued message without affecting state. + * Return true if state machine should go back to sleep, + * false otherwise. + */ +static bool tcpm_send_queued_message(struct udevice *dev) +{ + struct tcpm_port *port = dev_get_uclass_plat(dev); + enum pd_msg_request queued_message; + int max_messages = 100; + + do { + queued_message = port->queued_message; + port->queued_message = PD_MSG_NONE; + max_messages--; + + switch (queued_message) { + case PD_MSG_CTRL_WAIT: + tcpm_pd_send_control(dev, PD_CTRL_WAIT); + break; + case PD_MSG_CTRL_REJECT: + tcpm_pd_send_control(dev, PD_CTRL_REJECT); + break; + case PD_MSG_CTRL_NOT_SUPP: + tcpm_pd_send_control(dev, PD_CTRL_NOT_SUPP); + break; + case PD_MSG_DATA_SINK_CAP: + tcpm_pd_send_sink_caps(dev); + break; + case PD_MSG_DATA_SOURCE_CAP: + tcpm_pd_send_source_caps(dev); + break; + default: + break; + } + } while (max_messages > 0 && port->queued_message != PD_MSG_NONE); + + if (!max_messages) + dev_err(dev, "Aborted sending of too many queued messages\n"); + + return false; +} + +static int tcpm_pd_check_request(struct udevice *dev) +{ + struct tcpm_port *port = dev_get_uclass_plat(dev); + u32 pdo, rdo = port->sink_request; + unsigned int max, op, pdo_max, index; + enum pd_pdo_type type; + + index = rdo_index(rdo); + if (!index || index > port->nr_src_pdo) + return -EINVAL; + + pdo = port->src_pdo[index - 1]; + type = pdo_type(pdo); + switch (type) { + case PDO_TYPE_FIXED: + case PDO_TYPE_VAR: + max = rdo_max_current(rdo); + op = rdo_op_current(rdo); + pdo_max = pdo_max_current(pdo); + + if (op > pdo_max) + return -EINVAL; + if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH)) + return -EINVAL; + + if (type == PDO_TYPE_FIXED) + dev_dbg(dev, "TCPM: Requested %u mV, %u mA for %u / %u mA\n", + pdo_fixed_voltage(pdo), pdo_max, op, max); + else + dev_dbg(dev, "TCPM: Requested %u -> %u mV, %u mA for %u / %u mA\n", + pdo_min_voltage(pdo), pdo_max_voltage(pdo), + pdo_max, op, max); + break; + case PDO_TYPE_BATT: + max = rdo_max_power(rdo); + op = rdo_op_power(rdo); + pdo_max = pdo_max_power(pdo); + + if (op > pdo_max) + return -EINVAL; + if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH)) + return -EINVAL; + dev_info(dev, "TCPM: Requested %u -> %u mV, %u mW for %u / %u mW\n", + pdo_min_voltage(pdo), pdo_max_voltage(pdo), + pdo_max, op, max); + break; + default: + return -EINVAL; + } + + return 0; +} + +#define min_power(x, y) min(pdo_max_power(x), pdo_max_power(y)) +#define min_current(x, y) min(pdo_max_current(x), pdo_max_current(y)) + +static int tcpm_pd_select_pdo(struct udevice *dev, int *sink_pdo, + int *src_pdo) +{ + struct tcpm_port *port = dev_get_uclass_plat(dev); + unsigned int i, j, max_src_mv = 0, min_src_mv = 0, max_mw = 0, + max_mv = 0, src_mw = 0, src_ma = 0, max_snk_mv = 0, + min_snk_mv = 0; + int ret = -EINVAL; + + /* + * Select the source PDO providing the most power which has a + * matchig sink cap. + */ + for (i = 0; i < port->nr_source_caps; i++) { + u32 pdo = port->source_caps[i]; + enum pd_pdo_type type = pdo_type(pdo); + + switch (type) { + case PDO_TYPE_FIXED: + max_src_mv = pdo_fixed_voltage(pdo); + min_src_mv = max_src_mv; + break; + case PDO_TYPE_BATT: + case PDO_TYPE_VAR: + max_src_mv = pdo_max_voltage(pdo); + min_src_mv = pdo_min_voltage(pdo); + break; + case PDO_TYPE_APDO: + continue; + default: + dev_err(dev, "TCPM: Invalid source PDO type, ignoring\n"); + continue; + } + + switch (type) { + case PDO_TYPE_FIXED: + case PDO_TYPE_VAR: + src_ma = pdo_max_current(pdo); + src_mw = src_ma * min_src_mv / 1000; + break; + case PDO_TYPE_BATT: + src_mw = pdo_max_power(pdo); + break; + case PDO_TYPE_APDO: + continue; + default: + dev_err(dev, "TCPM: Invalid source PDO type, ignoring\n"); + continue; + } + + for (j = 0; j < port->nr_snk_pdo; j++) { + pdo = port->snk_pdo[j]; + + switch (pdo_type(pdo)) { + case PDO_TYPE_FIXED: + max_snk_mv = pdo_fixed_voltage(pdo); + min_snk_mv = max_snk_mv; + break; + case PDO_TYPE_BATT: + case PDO_TYPE_VAR: + max_snk_mv = pdo_max_voltage(pdo); + min_snk_mv = pdo_min_voltage(pdo); + break; + case PDO_TYPE_APDO: + continue; + default: + dev_err(dev, "TCPM: Invalid sink PDO type, ignoring\n"); + continue; + } + + if (max_src_mv <= max_snk_mv && min_src_mv >= min_snk_mv) { + /* Prefer higher voltages if available */ + if ((src_mw == max_mw && min_src_mv > max_mv) || + src_mw > max_mw) { + *src_pdo = i; + *sink_pdo = j; + max_mw = src_mw; + max_mv = min_src_mv; + ret = 0; + } + } + } + } + + return ret; +} + +static int tcpm_pd_build_request(struct udevice *dev, u32 *rdo) +{ + struct tcpm_port *port = dev_get_uclass_plat(dev); + unsigned int mv, ma, mw, flags; + unsigned int max_ma, max_mw; + enum pd_pdo_type type; + u32 pdo, matching_snk_pdo; + int src_pdo_index = 0; + int snk_pdo_index = 0; + int ret; + + ret = tcpm_pd_select_pdo(dev, &snk_pdo_index, &src_pdo_index); + if (ret < 0) + return ret; + + pdo = port->source_caps[src_pdo_index]; + matching_snk_pdo = port->snk_pdo[snk_pdo_index]; + type = pdo_type(pdo); + + switch (type) { + case PDO_TYPE_FIXED: + mv = pdo_fixed_voltage(pdo); + break; + case PDO_TYPE_BATT: + case PDO_TYPE_VAR: + mv = pdo_min_voltage(pdo); + break; + default: + dev_err(dev, "TCPM: Invalid PDO selected!\n"); + return -EINVAL; + } + + /* Select maximum available current within the sink pdo's limit */ + if (type == PDO_TYPE_BATT) { + mw = min_power(pdo, matching_snk_pdo); + ma = 1000 * mw / mv; + } else { + ma = min_current(pdo, matching_snk_pdo); + mw = ma * mv / 1000; + } + + flags = RDO_USB_COMM | RDO_NO_SUSPEND; + + /* Set mismatch bit if offered power is less than operating power */ + max_ma = ma; + max_mw = mw; + if (mw < port->operating_snk_mw) { + flags |= RDO_CAP_MISMATCH; + if (type == PDO_TYPE_BATT && + (pdo_max_power(matching_snk_pdo) > pdo_max_power(pdo))) + max_mw = pdo_max_power(matching_snk_pdo); + else if (pdo_max_current(matching_snk_pdo) > + pdo_max_current(pdo)) + max_ma = pdo_max_current(matching_snk_pdo); + } + + dev_dbg(dev, "TCPM: cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d\n", + port->cc_req, port->cc1, port->cc2, port->vbus_source, + port->vconn_role == TYPEC_SOURCE ? "source" : "sink", + port->polarity); + + if (type == PDO_TYPE_BATT) { + *rdo = RDO_BATT(src_pdo_index + 1, mw, max_mw, flags); + + dev_info(dev, "TCPM: requesting PDO %d: %u mV, %u mW%s\n", + src_pdo_index, mv, mw, + flags & RDO_CAP_MISMATCH ? " [mismatch]" : ""); + } else { + *rdo = RDO_FIXED(src_pdo_index + 1, ma, max_ma, flags); + + dev_info(dev, "TCPM: requesting PDO %d: %u mV, %u mA%s\n", + src_pdo_index, mv, ma, + flags & RDO_CAP_MISMATCH ? " [mismatch]" : ""); + } + + port->req_current_limit = ma; + port->req_supply_voltage = mv; + + return 0; +} + +static int tcpm_pd_send_request(struct udevice *dev) +{ + struct tcpm_port *port = dev_get_uclass_plat(dev); + struct pd_message msg; + int ret; + u32 rdo; + + ret = tcpm_pd_build_request(dev, &rdo); + if (ret < 0) + return ret; + + memset(&msg, 0, sizeof(msg)); + msg.header = PD_HEADER_LE(PD_DATA_REQUEST, + port->pwr_role, + port->data_role, + port->negotiated_rev, + port->message_id, 1); + msg.payload[0] = cpu_to_le32(rdo); + + return tcpm_pd_transmit(dev, TCPC_TX_SOP, &msg); +} + +static int tcpm_set_vbus(struct udevice *dev, bool enable) +{ + struct tcpm_port *port = dev_get_uclass_plat(dev); + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev); + int ret; + + if (enable && port->vbus_charge) + return -EINVAL; + + dev_dbg(dev, "TCPM: set vbus = %d charge = %d\n", + enable, port->vbus_charge); + + ret = drvops->set_vbus(dev, enable, port->vbus_charge); + if (ret < 0) + return ret; + + port->vbus_source = enable; + return 0; +} + +static int tcpm_set_charge(struct udevice *dev, bool charge) +{ + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev); + struct tcpm_port *port = dev_get_uclass_plat(dev); + int ret; + + if (charge && port->vbus_source) + return -EINVAL; + + if (charge != port->vbus_charge) { + dev_dbg(dev, "TCPM: set vbus = %d charge = %d\n", + port->vbus_source, charge); + ret = drvops->set_vbus(dev, port->vbus_source, + charge); + if (ret < 0) + return ret; + } + port->vbus_charge = charge; + return 0; +} + +static bool tcpm_start_toggling(struct udevice *dev, enum typec_cc_status cc) +{ + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev); + struct tcpm_port *port = dev_get_uclass_plat(dev); + int ret; + + if (!drvops->start_toggling) + return false; + + dev_dbg(dev, "TCPM: Start toggling\n"); + ret = drvops->start_toggling(dev, port->port_type, cc); + return ret == 0; +} + +static int tcpm_init_vbus(struct udevice *dev) +{ + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev); + struct tcpm_port *port = dev_get_uclass_plat(dev); + int ret; + + ret = drvops->set_vbus(dev, false, false); + port->vbus_source = false; + port->vbus_charge = false; + return ret; +} + +static int tcpm_init_vconn(struct udevice *dev) +{ + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev); + struct tcpm_port *port = dev_get_uclass_plat(dev); + int ret; + + ret = drvops->set_vconn(dev, false); + port->vconn_role = TYPEC_SINK; + return ret; +} + +static inline void tcpm_typec_connect(struct tcpm_port *port) +{ + if (!port->connected) + port->connected = true; +} + +static int tcpm_src_attach(struct udevice *dev) +{ + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev); + struct tcpm_port *port = dev_get_uclass_plat(dev); + enum typec_cc_polarity polarity = + port->cc2 == TYPEC_CC_RD ? TYPEC_POLARITY_CC2 + : TYPEC_POLARITY_CC1; + int ret; + + if (port->attached) + return 0; + + ret = tcpm_set_polarity(dev, polarity); + if (ret < 0) + return ret; + + ret = tcpm_set_roles(dev, true, TYPEC_SOURCE, TYPEC_HOST); + if (ret < 0) + return ret; + + ret = drvops->set_pd_rx(dev, true); + if (ret < 0) + goto out_disable_mux; + + /* + * USB Type-C specification, version 1.2, + * chapter 4.5.2.2.8.1 (Attached.SRC Requirements) + * Enable VCONN only if the non-RD port is set to RA. + */ + if ((polarity == TYPEC_POLARITY_CC1 && port->cc2 == TYPEC_CC_RA) || + (polarity == TYPEC_POLARITY_CC2 && port->cc1 == TYPEC_CC_RA)) { + ret = tcpm_set_vconn(dev, true); + if (ret < 0) + goto out_disable_pd; + } + + ret = tcpm_set_vbus(dev, true); + if (ret < 0) + goto out_disable_vconn; + + port->pd_capable = false; + + port->partner = NULL; + + port->attached = true; + + return 0; + +out_disable_vconn: + tcpm_set_vconn(dev, false); +out_disable_pd: + drvops->set_pd_rx(dev, false); +out_disable_mux: + dev_err(dev, "TCPM: CC connected in %s as DFP\n", + polarity ? "CC2" : "CC1"); + return 0; +} + +static inline void tcpm_typec_disconnect(struct tcpm_port *port) +{ + if (port->connected) { + port->partner = NULL; + port->connected = false; + } +} + +static void tcpm_reset_port(struct udevice *dev) +{ + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev); + struct tcpm_port *port = dev_get_uclass_plat(dev); + + tcpm_timer_uninit(dev); + tcpm_typec_disconnect(port); + tcpm_reset_event_cnt(dev); + port->wait_dr_swap_message = false; + port->attached = false; + port->pd_capable = false; + + /* + * First Rx ID should be 0; set this to a sentinel of -1 so that + * we can check tcpm_pd_rx_handler() if we had seen it before. + */ + port->rx_msgid = -1; + + drvops->set_pd_rx(dev, false); + tcpm_init_vbus(dev); /* also disables charging */ + tcpm_init_vconn(dev); + tcpm_set_current_limit(dev, 0, 0); + tcpm_set_polarity(dev, TYPEC_POLARITY_CC1); + tcpm_set_attached_state(dev, false); + port->nr_sink_caps = 0; +} + +static void tcpm_detach(struct udevice *dev) +{ + struct tcpm_port *port = dev_get_uclass_plat(dev); + + if (tcpm_port_is_disconnected(port)) + port->hard_reset_count = 0; + + if (!port->attached) + return; + + tcpm_reset_port(dev); +} + +static void tcpm_src_detach(struct udevice *dev) +{ + tcpm_detach(dev); +} + +static int tcpm_snk_attach(struct udevice *dev) +{ + struct tcpm_port *port = dev_get_uclass_plat(dev); + int ret; + + if (port->attached) + return 0; + + ret = tcpm_set_polarity(dev, port->cc2 != TYPEC_CC_OPEN ? + TYPEC_POLARITY_CC2 : TYPEC_POLARITY_CC1); + if (ret < 0) + return ret; + + ret = tcpm_set_roles(dev, true, TYPEC_SINK, TYPEC_DEVICE); + if (ret < 0) + return ret; + + port->pd_capable = false; + + port->partner = NULL; + + port->attached = true; + dev_info(dev, "TCPM: CC connected in %s as UFP\n", + port->cc1 != TYPEC_CC_OPEN ? "CC1" : "CC2"); + + return 0; +} + +static void tcpm_snk_detach(struct udevice *dev) +{ + tcpm_detach(dev); +} + +static inline enum tcpm_state hard_reset_state(struct tcpm_port *port) +{ + if (port->hard_reset_count < PD_N_HARD_RESET_COUNT) + return HARD_RESET_SEND; + if (port->pd_capable) + return ERROR_RECOVERY; + if (port->pwr_role == TYPEC_SOURCE) + return SRC_UNATTACHED; + if (port->state == SNK_WAIT_CAPABILITIES) + return SNK_READY; + return SNK_UNATTACHED; +} + +static inline enum tcpm_state unattached_state(struct tcpm_port *port) +{ + if (port->port_type == TYPEC_PORT_DRP) { + if (port->pwr_role == TYPEC_SOURCE) + return SRC_UNATTACHED; + else + return SNK_UNATTACHED; + } else if (port->port_type == TYPEC_PORT_SRC) { + return SRC_UNATTACHED; + } + + return SNK_UNATTACHED; +} + +static void run_state_machine(struct udevice *dev) +{ + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev); + struct tcpm_port *port = dev_get_uclass_plat(dev); + int ret; + + port->enter_state = port->state; + switch (port->state) { + case TOGGLING: + break; + /* SRC states */ + case SRC_UNATTACHED: + tcpm_src_detach(dev); + if (tcpm_start_toggling(dev, tcpm_rp_cc(port))) { + tcpm_set_state(dev, TOGGLING, 0); + break; + } + tcpm_set_cc(dev, tcpm_rp_cc(port)); + if (port->port_type == TYPEC_PORT_DRP) + tcpm_set_state(dev, SNK_UNATTACHED, PD_T_DRP_SNK); + break; + case SRC_ATTACH_WAIT: + if (tcpm_port_is_source(port)) + tcpm_set_state(dev, SRC_ATTACHED, PD_T_CC_DEBOUNCE); + break; + + case SRC_ATTACHED: + ret = tcpm_src_attach(dev); + /* + * Currently, vbus control is not implemented, + * and the SRC detection process cannot be fully implemented. + */ + tcpm_set_state(dev, SRC_READY, 0); + break; + case SRC_STARTUP: + port->caps_count = 0; + port->negotiated_rev = PD_MAX_REV; + port->message_id = 0; + port->rx_msgid = -1; + port->explicit_contract = false; + tcpm_set_state(dev, SRC_SEND_CAPABILITIES, 0); + break; + case SRC_SEND_CAPABILITIES: + port->caps_count++; + if (port->caps_count > PD_N_CAPS_COUNT) { + tcpm_set_state(dev, SRC_READY, 0); + break; + } + ret = tcpm_pd_send_source_caps(dev); + if (ret < 0) { + tcpm_set_state(dev, SRC_SEND_CAPABILITIES, + PD_T_SEND_SOURCE_CAP); + } else { + /* + * Per standard, we should clear the reset counter here. + * However, that can result in state machine hang-ups. + * Reset it only in READY state to improve stability. + */ + /* port->hard_reset_count = 0; */ + port->caps_count = 0; + port->pd_capable = true; + tcpm_set_state_cond(dev, SRC_SEND_CAPABILITIES_TIMEOUT, + PD_T_SEND_SOURCE_CAP); + } + break; + case SRC_SEND_CAPABILITIES_TIMEOUT: + /* + * Error recovery for a PD_DATA_SOURCE_CAP reply timeout. + * + * PD 2.0 sinks are supposed to accept src-capabilities with a + * 3.0 header and simply ignore any src PDOs which the sink does + * not understand such as PPS but some 2.0 sinks instead ignore + * the entire PD_DATA_SOURCE_CAP message, causing contract + * negotiation to fail. + * + * After PD_N_HARD_RESET_COUNT hard-reset attempts, we try + * sending src-capabilities with a lower PD revision to + * make these broken sinks work. + */ + if (port->hard_reset_count < PD_N_HARD_RESET_COUNT) { + tcpm_set_state(dev, HARD_RESET_SEND, 0); + } else if (port->negotiated_rev > PD_REV20) { + port->negotiated_rev--; + port->hard_reset_count = 0; + tcpm_set_state(dev, SRC_SEND_CAPABILITIES, 0); + } else { + tcpm_set_state(dev, hard_reset_state(port), 0); + } + break; + case SRC_NEGOTIATE_CAPABILITIES: + ret = tcpm_pd_check_request(dev); + if (ret < 0) { + tcpm_pd_send_control(dev, PD_CTRL_REJECT); + if (!port->explicit_contract) { + tcpm_set_state(dev, + SRC_WAIT_NEW_CAPABILITIES, 0); + } else { + tcpm_set_state(dev, SRC_READY, 0); + } + } else { + tcpm_pd_send_control(dev, PD_CTRL_ACCEPT); + tcpm_set_state(dev, SRC_TRANSITION_SUPPLY, + PD_T_SRC_TRANSITION); + } + break; + case SRC_TRANSITION_SUPPLY: + /* XXX: regulator_set_voltage(vbus, ...) */ + tcpm_pd_send_control(dev, PD_CTRL_PS_RDY); + port->explicit_contract = true; + tcpm_set_state_cond(dev, SRC_READY, 0); + break; + case SRC_READY: + port->hard_reset_count = 0; + + tcpm_typec_connect(port); + break; + case SRC_WAIT_NEW_CAPABILITIES: + /* Nothing to do... */ + break; + + /* SNK states */ + case SNK_UNATTACHED: + tcpm_snk_detach(dev); + if (tcpm_start_toggling(dev, TYPEC_CC_RD)) { + tcpm_set_state(dev, TOGGLING, 0); + break; + } + tcpm_set_cc(dev, TYPEC_CC_RD); + if (port->port_type == TYPEC_PORT_DRP) + tcpm_set_state(dev, SRC_UNATTACHED, PD_T_DRP_SRC); + break; + case SNK_ATTACH_WAIT: + if ((port->cc1 == TYPEC_CC_OPEN && + port->cc2 != TYPEC_CC_OPEN) || + (port->cc1 != TYPEC_CC_OPEN && + port->cc2 == TYPEC_CC_OPEN)) + tcpm_set_state(dev, SNK_DEBOUNCED, + PD_T_CC_DEBOUNCE); + else if (tcpm_port_is_disconnected(port)) + tcpm_set_state(dev, SNK_UNATTACHED, + PD_T_CC_DEBOUNCE); + break; + case SNK_DEBOUNCED: + if (tcpm_port_is_disconnected(port)) + tcpm_set_state(dev, SNK_UNATTACHED, PD_T_PD_DEBOUNCE); + else if (port->vbus_present) + tcpm_set_state(dev, SNK_ATTACHED, 0); + else + /* Wait for VBUS, but not forever */ + tcpm_set_state(dev, PORT_RESET, PD_T_PS_SOURCE_ON); + break; + case SNK_ATTACHED: + ret = tcpm_snk_attach(dev); + if (ret < 0) + tcpm_set_state(dev, SNK_UNATTACHED, 0); + else + tcpm_set_state(dev, SNK_STARTUP, 0); + break; + case SNK_STARTUP: + port->negotiated_rev = PD_MAX_REV; + port->message_id = 0; + port->rx_msgid = -1; + port->explicit_contract = false; + tcpm_set_state(dev, SNK_DISCOVERY, 0); + break; + case SNK_DISCOVERY: + if (port->vbus_present) { + tcpm_set_current_limit(dev, + tcpm_get_current_limit(port), + 5000); + tcpm_set_charge(dev, true); + tcpm_set_state(dev, SNK_WAIT_CAPABILITIES, 0); + break; + } + /* + * For DRP, timeouts differ. Also, handling is supposed to be + * different and much more complex (dead battery detection; + * see USB power delivery specification, section 8.3.3.6.1.5.1). + */ + tcpm_set_state(dev, hard_reset_state(port), + port->port_type == TYPEC_PORT_DRP ? + PD_T_DB_DETECT : PD_T_NO_RESPONSE); + break; + case SNK_DISCOVERY_DEBOUNCE: + tcpm_set_state(dev, SNK_DISCOVERY_DEBOUNCE_DONE, + PD_T_CC_DEBOUNCE); + break; + case SNK_DISCOVERY_DEBOUNCE_DONE: + tcpm_set_state(dev, unattached_state(port), 0); + break; + case SNK_WAIT_CAPABILITIES: + ret = drvops->set_pd_rx(dev, true); + if (ret < 0) { + tcpm_set_state(dev, SNK_READY, 0); + break; + } + /* + * If VBUS has never been low, and we time out waiting + * for source cap, try a soft reset first, in case we + * were already in a stable contract before this boot. + * Do this only once. + */ + if (port->vbus_never_low) { + port->vbus_never_low = false; + tcpm_set_state(dev, SOFT_RESET_SEND, + PD_T_SINK_WAIT_CAP); + } else { + tcpm_set_state(dev, hard_reset_state(port), + PD_T_SINK_WAIT_CAP); + } + break; + case SNK_NEGOTIATE_CAPABILITIES: + port->pd_capable = true; + port->hard_reset_count = 0; + ret = tcpm_pd_send_request(dev); + if (ret < 0) { + /* Let the Source send capabilities again. */ + tcpm_set_state(dev, SNK_WAIT_CAPABILITIES, 0); + } else { + tcpm_set_state_cond(dev, hard_reset_state(port), + PD_T_SENDER_RESPONSE); + } + break; + case SNK_TRANSITION_SINK: + case SNK_TRANSITION_SINK_VBUS: + tcpm_set_state(dev, hard_reset_state(port), + PD_T_PS_TRANSITION); + break; + case SNK_READY: + port->update_sink_caps = false; + tcpm_typec_connect(port); + /* + * Here poll_event_cnt is cleared, waiting for self-powered Type-C devices + * to send DR_swap Messge until 1s (TCPM_POLL_EVENT_TIME_OUT * 500us)timeout + */ + if (port->wait_dr_swap_message) + tcpm_reset_event_cnt(dev); + + break; + + /* Hard_Reset states */ + case HARD_RESET_SEND: + tcpm_pd_transmit(dev, TCPC_TX_HARD_RESET, NULL); + tcpm_set_state(dev, HARD_RESET_START, 0); + port->wait_dr_swap_message = false; + break; + case HARD_RESET_START: + port->hard_reset_count++; + drvops->set_pd_rx(dev, false); + port->nr_sink_caps = 0; + if (port->pwr_role == TYPEC_SOURCE) + tcpm_set_state(dev, SRC_HARD_RESET_VBUS_OFF, + PD_T_PS_HARD_RESET); + else + tcpm_set_state(dev, SNK_HARD_RESET_SINK_OFF, 0); + break; + case SRC_HARD_RESET_VBUS_OFF: + tcpm_set_vconn(dev, true); + tcpm_set_vbus(dev, false); + tcpm_set_roles(dev, port->self_powered, TYPEC_SOURCE, + TYPEC_HOST); + tcpm_set_state(dev, SRC_HARD_RESET_VBUS_ON, PD_T_SRC_RECOVER); + break; + case SRC_HARD_RESET_VBUS_ON: + tcpm_set_vconn(dev, true); + tcpm_set_vbus(dev, true); + drvops->set_pd_rx(dev, true); + tcpm_set_attached_state(dev, true); + tcpm_set_state(dev, SRC_UNATTACHED, PD_T_PS_SOURCE_ON); + break; + case SNK_HARD_RESET_SINK_OFF: + tcpm_set_vconn(dev, false); + if (port->pd_capable) + tcpm_set_charge(dev, false); + tcpm_set_roles(dev, port->self_powered, TYPEC_SINK, + TYPEC_DEVICE); + /* + * VBUS may or may not toggle, depending on the adapter. + * If it doesn't toggle, transition to SNK_HARD_RESET_SINK_ON + * directly after timeout. + */ + tcpm_set_state(dev, SNK_HARD_RESET_SINK_ON, PD_T_SAFE_0V); + break; + case SNK_HARD_RESET_WAIT_VBUS: + /* Assume we're disconnected if VBUS doesn't come back. */ + tcpm_set_state(dev, SNK_UNATTACHED, + PD_T_SRC_RECOVER_MAX + PD_T_SRC_TURN_ON); + break; + case SNK_HARD_RESET_SINK_ON: + /* Note: There is no guarantee that VBUS is on in this state */ + /* + * XXX: + * The specification suggests that dual mode ports in sink + * mode should transition to state PE_SRC_Transition_to_default. + * See USB power delivery specification chapter 8.3.3.6.1.3. + * This would mean to + * - turn off VCONN, reset power supply + * - request hardware reset + * - turn on VCONN + * - Transition to state PE_Src_Startup + * SNK only ports shall transition to state Snk_Startup + * (see chapter 8.3.3.3.8). + * Similar, dual-mode ports in source mode should transition + * to PE_SNK_Transition_to_default. + */ + if (port->pd_capable) { + tcpm_set_current_limit(dev, + tcpm_get_current_limit(port), + 5000); + tcpm_set_charge(dev, true); + } + tcpm_set_attached_state(dev, true); + tcpm_set_state(dev, SNK_STARTUP, 0); + break; + + /* Soft_Reset states */ + case SOFT_RESET: + port->message_id = 0; + port->rx_msgid = -1; + tcpm_pd_send_control(dev, PD_CTRL_ACCEPT); + if (port->pwr_role == TYPEC_SOURCE) + tcpm_set_state(dev, SRC_SEND_CAPABILITIES, 0); + else + tcpm_set_state(dev, SNK_WAIT_CAPABILITIES, 0); + break; + case SOFT_RESET_SEND: + port->message_id = 0; + port->rx_msgid = -1; + if (tcpm_pd_send_control(dev, PD_CTRL_SOFT_RESET)) + tcpm_set_state_cond(dev, hard_reset_state(port), 0); + else + tcpm_set_state_cond(dev, hard_reset_state(port), + PD_T_SENDER_RESPONSE); + break; + + /* DR_Swap states */ + case DR_SWAP_ACCEPT: + tcpm_pd_send_control(dev, PD_CTRL_ACCEPT); + tcpm_set_state_cond(dev, DR_SWAP_CHANGE_DR, 0); + break; + case DR_SWAP_CHANGE_DR: + if (port->data_role == TYPEC_HOST) { + tcpm_set_roles(dev, true, port->pwr_role, + TYPEC_DEVICE); + } else { + tcpm_set_roles(dev, true, port->pwr_role, + TYPEC_HOST); + } + /* DR_swap process complete, wait_dr_swap_message is cleared */ + port->wait_dr_swap_message = false; + tcpm_set_state(dev, ready_state(port), 0); + break; + case ERROR_RECOVERY: + tcpm_set_state(dev, PORT_RESET, 0); + break; + case PORT_RESET: + tcpm_reset_port(dev); + if (port->self_powered) + tcpm_set_cc(dev, TYPEC_CC_OPEN); + else + tcpm_set_cc(dev, tcpm_default_state(port) == SNK_UNATTACHED ? + TYPEC_CC_RD : tcpm_rp_cc(port)); + tcpm_set_state(dev, PORT_RESET_WAIT_OFF, + PD_T_ERROR_RECOVERY); + break; + case PORT_RESET_WAIT_OFF: + tcpm_set_state(dev, + tcpm_default_state(port), + port->vbus_present ? PD_T_PS_SOURCE_OFF : 0); + break; + default: + dev_err(dev, "TCPM: Unexpected port state %d\n", port->state); + break; + } +} + +static void tcpm_state_machine(struct udevice *dev) +{ + struct tcpm_port *port = dev_get_uclass_plat(dev); + enum tcpm_state prev_state; + + mutex_lock(&port->lock); + port->state_machine_running = true; + + if (port->queued_message && tcpm_send_queued_message(dev)) + goto done; + + /* If we were queued due to a delayed state change, update it now */ + if (port->delayed_state) { + dev_dbg(dev, "TCPM: state change %s -> %s [delayed %ld ms]\n", + tcpm_states[port->state], + tcpm_states[port->delayed_state], port->delay_ms); + port->prev_state = port->state; + port->state = port->delayed_state; + port->delayed_state = INVALID_STATE; + } + + /* + * Continue running as long as we have (non-delayed) state changes + * to make. + */ + do { + prev_state = port->state; + run_state_machine(dev); + if (port->queued_message) + tcpm_send_queued_message(dev); + } while (port->state != prev_state && !port->delayed_state); + +done: + port->state_machine_running = false; + mutex_unlock(&port->lock); +} + +static void _tcpm_cc_change(struct udevice *dev, enum typec_cc_status cc1, + enum typec_cc_status cc2) +{ + struct tcpm_port *port = dev_get_uclass_plat(dev); + enum typec_cc_status old_cc1, old_cc2; + enum tcpm_state new_state; + + old_cc1 = port->cc1; + old_cc2 = port->cc2; + port->cc1 = cc1; + port->cc2 = cc2; + + dev_dbg(dev, "TCPM: CC1: %u -> %u, CC2: %u -> %u [state %s, polarity %d, %s]\n", + old_cc1, cc1, old_cc2, cc2, tcpm_states[port->state], + port->polarity, + tcpm_port_is_disconnected(port) ? "disconnected" : "connected"); + + switch (port->state) { + case TOGGLING: + if (tcpm_port_is_source(port)) + tcpm_set_state(dev, SRC_ATTACH_WAIT, 0); + else if (tcpm_port_is_sink(port)) + tcpm_set_state(dev, SNK_ATTACH_WAIT, 0); + break; + case SRC_UNATTACHED: + case SRC_ATTACH_WAIT: + if (tcpm_port_is_disconnected(port)) + tcpm_set_state(dev, SRC_UNATTACHED, 0); + else if (cc1 != old_cc1 || cc2 != old_cc2) + tcpm_set_state(dev, SRC_ATTACH_WAIT, 0); + break; + case SRC_ATTACHED: + case SRC_SEND_CAPABILITIES: + case SRC_READY: + if (tcpm_port_is_disconnected(port) || + !tcpm_port_is_source(port)) + tcpm_set_state(dev, SRC_UNATTACHED, 0); + break; + case SNK_UNATTACHED: + if (tcpm_port_is_sink(port)) + tcpm_set_state(dev, SNK_ATTACH_WAIT, 0); + break; + case SNK_ATTACH_WAIT: + if ((port->cc1 == TYPEC_CC_OPEN && + port->cc2 != TYPEC_CC_OPEN) || + (port->cc1 != TYPEC_CC_OPEN && + port->cc2 == TYPEC_CC_OPEN)) + new_state = SNK_DEBOUNCED; + else if (tcpm_port_is_disconnected(port)) + new_state = SNK_UNATTACHED; + else + break; + if (new_state != port->delayed_state) + tcpm_set_state(dev, SNK_ATTACH_WAIT, 0); + break; + case SNK_DEBOUNCED: + if (tcpm_port_is_disconnected(port)) + new_state = SNK_UNATTACHED; + else if (port->vbus_present) + new_state = tcpm_try_src(port) ? INVALID_STATE : SNK_ATTACHED; + else + new_state = SNK_UNATTACHED; + if (new_state != port->delayed_state) + tcpm_set_state(dev, SNK_DEBOUNCED, 0); + break; + case SNK_READY: + if (tcpm_port_is_disconnected(port)) + tcpm_set_state(dev, unattached_state(port), 0); + else if (!port->pd_capable && + (cc1 != old_cc1 || cc2 != old_cc2)) + tcpm_set_current_limit(dev, + tcpm_get_current_limit(port), + 5000); + break; + + case SNK_DISCOVERY: + /* CC line is unstable, wait for debounce */ + if (tcpm_port_is_disconnected(port)) + tcpm_set_state(dev, SNK_DISCOVERY_DEBOUNCE, 0); + break; + case SNK_DISCOVERY_DEBOUNCE: + break; + + case PORT_RESET: + case PORT_RESET_WAIT_OFF: + /* + * State set back to default mode once the timer completes. + * Ignore CC changes here. + */ + break; + default: + /* + * While acting as sink and auto vbus discharge is enabled, Allow disconnect + * to be driven by vbus disconnect. + */ + if (tcpm_port_is_disconnected(port)) + tcpm_set_state(dev, unattached_state(port), 0); + break; + } +} + +static void _tcpm_pd_vbus_on(struct udevice *dev) +{ + struct tcpm_port *port = dev_get_uclass_plat(dev); + + dev_dbg(dev, "TCPM: VBUS on event\n"); + port->vbus_present = true; + /* + * When vbus_present is true i.e. Voltage at VBUS is greater than VSAFE5V implicitly + * states that vbus is not at VSAFE0V, hence clear the vbus_vsafe0v flag here. + */ + port->vbus_vsafe0v = false; + + switch (port->state) { + case SNK_TRANSITION_SINK_VBUS: + port->explicit_contract = true; + tcpm_set_state(dev, SNK_READY, 0); + break; + case SNK_DISCOVERY: + tcpm_set_state(dev, SNK_DISCOVERY, 0); + break; + case SNK_DEBOUNCED: + tcpm_set_state(dev, SNK_ATTACHED, 0); + break; + case SNK_HARD_RESET_WAIT_VBUS: + tcpm_set_state(dev, SNK_HARD_RESET_SINK_ON, 0); + break; + case SRC_ATTACHED: + tcpm_set_state(dev, SRC_STARTUP, 0); + break; + case SRC_HARD_RESET_VBUS_ON: + tcpm_set_state(dev, SRC_STARTUP, 0); + break; + + case PORT_RESET: + case PORT_RESET_WAIT_OFF: + /* + * State set back to default mode once the timer completes. + * Ignore vbus changes here. + */ + break; + + default: + break; + } +} + +static void _tcpm_pd_vbus_off(struct udevice *dev) +{ + struct tcpm_port *port = dev_get_uclass_plat(dev); + + dev_dbg(dev, "TCPM: VBUS off event\n"); + port->vbus_present = false; + port->vbus_never_low = false; + switch (port->state) { + case SNK_HARD_RESET_SINK_OFF: + tcpm_set_state(dev, SNK_HARD_RESET_WAIT_VBUS, 0); + break; + case HARD_RESET_SEND: + break; + case SNK_ATTACH_WAIT: + tcpm_set_state(dev, SNK_UNATTACHED, 0); + break; + + case SNK_NEGOTIATE_CAPABILITIES: + break; + + case PORT_RESET_WAIT_OFF: + tcpm_set_state(dev, tcpm_default_state(port), 0); + break; + + case PORT_RESET: + /* + * State set back to default mode once the timer completes. + * Ignore vbus changes here. + */ + break; + + default: + if (port->pwr_role == TYPEC_SINK && port->attached) + tcpm_set_state(dev, SNK_UNATTACHED, 0); + break; + } +} + +void tcpm_cc_change(struct udevice *dev) +{ + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev); + enum typec_cc_status cc1, cc2; + + tcpm_reset_event_cnt(dev); + if (drvops->get_cc(dev, &cc1, &cc2) == 0) + _tcpm_cc_change(dev, cc1, cc2); +} + +void tcpm_vbus_change(struct udevice *dev) +{ + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev); + bool vbus; + + tcpm_reset_event_cnt(dev); + vbus = drvops->get_vbus(dev); + if (vbus) + _tcpm_pd_vbus_on(dev); + else + _tcpm_pd_vbus_off(dev); +} + +void tcpm_pd_hard_reset(struct udevice *dev) +{ + struct tcpm_port *port = dev_get_uclass_plat(dev); + + tcpm_reset_event_cnt(dev); + dev_dbg(dev, "TCPM: Received hard reset\n"); + + /* If a hard reset message is received during the port reset process, + * we should ignore it, that is, do not set port->state to HARD_RESET_START. + */ + if (port->state == PORT_RESET || port->state == PORT_RESET_WAIT_OFF) + return; + + /* + * If we keep receiving hard reset requests, executing the hard reset + * must have failed. Revert to error recovery if that happens. + */ + tcpm_set_state(dev, + port->hard_reset_count < PD_N_HARD_RESET_COUNT ? + HARD_RESET_START : ERROR_RECOVERY, + 0); +} + +static void tcpm_init(struct udevice *dev) +{ + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev); + struct tcpm_port *port = dev_get_uclass_plat(dev); + enum typec_cc_status cc1, cc2; + + drvops->init(dev); + + tcpm_reset_port(dev); + + /* + * XXX + * Should possibly wait for VBUS to settle if it was enabled locally + * since tcpm_reset_port() will disable VBUS. + */ + port->vbus_present = drvops->get_vbus(dev); + if (port->vbus_present) + port->vbus_never_low = true; + + /* + * 1. When vbus_present is true, voltage on VBUS is already at VSAFE5V. + * So implicitly vbus_vsafe0v = false. + * + * 2. When vbus_present is false and TCPC does NOT support querying + * vsafe0v status, then, it's best to assume vbus is at VSAFE0V i.e. + * vbus_vsafe0v is true. + * + * 3. When vbus_present is false and TCPC does support querying vsafe0v, + * then, query tcpc for vsafe0v status. + */ + if (port->vbus_present) + port->vbus_vsafe0v = false; + else + port->vbus_vsafe0v = true; + + tcpm_set_state(dev, tcpm_default_state(port), 0); + + if (drvops->get_cc(dev, &cc1, &cc2) == 0) + _tcpm_cc_change(dev, cc1, cc2); +} + +static int tcpm_fw_get_caps(struct udevice *dev) +{ + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev); + struct tcpm_port *port = dev_get_uclass_plat(dev); + ofnode node; + const char *cap_str; + int ret; + u32 mw; + + ret = drvops->get_connector_node(dev, &node); + if (ret) + return ret; + + cap_str = ofnode_read_string(node, "power-role"); + if (!cap_str) + return -EINVAL; + + if (!strcmp("dual", cap_str)) + port->typec_type = TYPEC_PORT_DRP; + else if (!strcmp("source", cap_str)) + port->typec_type = TYPEC_PORT_SRC; + else if (!strcmp("sink", cap_str)) + port->typec_type = TYPEC_PORT_SNK; + else + return -EINVAL; + + port->port_type = port->typec_type; + + if (port->port_type == TYPEC_PORT_SNK) + goto sink; + + /* Get source pdos */ + ret = ofnode_read_size(node, "source-pdos") / sizeof(u32); + if (ret <= 0) + return -EINVAL; + + port->nr_src_pdo = min(ret, PDO_MAX_OBJECTS); + ret = ofnode_read_u32_array(node, "source-pdos", + port->src_pdo, port->nr_src_pdo); + if (ret || tcpm_validate_caps(dev, port->src_pdo, port->nr_src_pdo)) + return -EINVAL; + + if (port->port_type == TYPEC_PORT_SRC) + return 0; + + /* Get the preferred power role for DRP */ + cap_str = ofnode_read_string(node, "try-power-role"); + if (!cap_str) + return -EINVAL; + + if (!strcmp("sink", cap_str)) + port->typec_prefer_role = TYPEC_SINK; + else if (!strcmp("source", cap_str)) + port->typec_prefer_role = TYPEC_SOURCE; + else + return -EINVAL; + + if (port->typec_prefer_role < 0) + return -EINVAL; +sink: + /* Get sink pdos */ + ret = ofnode_read_size(node, "sink-pdos") / sizeof(u32); + if (ret <= 0) + return -EINVAL; + + port->nr_snk_pdo = min(ret, PDO_MAX_OBJECTS); + ret = ofnode_read_u32_array(node, "sink-pdos", + port->snk_pdo, port->nr_snk_pdo); + if (ret || tcpm_validate_caps(dev, port->snk_pdo, port->nr_snk_pdo)) + return -EINVAL; + + if (ofnode_read_u32_array(node, "op-sink-microwatt", &mw, 1)) + return -EINVAL; + port->operating_snk_mw = mw / 1000; + + port->self_powered = ofnode_read_bool(node, "self-powered"); + + return 0; +} + +static int tcpm_port_init(struct udevice *dev) +{ + struct tcpm_port *port = dev_get_uclass_plat(dev); + int err; + + err = tcpm_fw_get_caps(dev); + if (err < 0) { + dev_err(dev, "TCPM: please check the dts config: %d\n", err); + return err; + } + + port->try_role = port->typec_prefer_role; + port->port_type = port->typec_type; + + tcpm_init(dev); + + dev_info(dev, "TCPM: init finished\n"); + + return 0; +} + +static void tcpm_poll_event(struct udevice *dev) +{ + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev); + struct tcpm_port *port = dev_get_uclass_plat(dev); + + if (!drvops->get_vbus(dev)) + return; + + while (port->poll_event_cnt < TCPM_POLL_EVENT_TIME_OUT) { + if (!port->wait_dr_swap_message && + (port->state == SNK_READY || port->state == SRC_READY)) + break; + + drvops->poll_event(dev); + port->poll_event_cnt++; + udelay(500); + tcpm_check_and_run_delayed_work(dev); + } + + if (port->state != SNK_READY && port->state != SRC_READY) + dev_warn(dev, "TCPM: exit in state %s\n", + tcpm_states[port->state]); + + /* + * At this time, call the callback function of the respective pd chip + * to enter the low-power mode. In order to reduce the time spent on + * the PD chip driver as much as possible, the tcpm framework does not + * fully process the communication initiated by the device,so it should + * be noted that we can disable the internal oscillator, etc., but do + * not turn off the power of the transceiver module, otherwise the + * self-powered Type-C device will initiate a Message(eg: self-powered + * Type-C hub initiates a SINK capability request(PD_CTRL_GET_SINK_CAP)) + * and the pd chip cannot reply to GoodCRC, causing the self-powered Type-C + * device to switch vbus to vSafe5v, or even turn off vbus. + */ + if (!drvops->enter_low_power_mode) + return; + + if (drvops->enter_low_power_mode(dev, port->attached, port->pd_capable)) + dev_err(dev, "TCPM: failed to enter low power\n"); + else + dev_info(dev, "TCPM: PD chip enter low power mode\n"); +} + +int tcpm_post_probe(struct udevice *dev) +{ + int ret = tcpm_port_init(dev); + + if (ret < 0) { + dev_err(dev, "failed to tcpm port init\n"); + return ret; + } + + tcpm_poll_event(dev); + + return 0; +} |