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Message-ID: <3d44bdca-4716-64ea-2992-6932f2178ff3@roeck-us.net>
Date: Sun, 25 Mar 2018 20:10:58 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Adam Thomson <Adam.Thomson.Opensource@...semi.com>,
Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Sebastian Reichel <sre@...nel.org>,
Hans de Goede <hdegoede@...hat.com>, Jun Li <jun.li@....com>
Cc: linux-usb@...r.kernel.org, linux-pm@...r.kernel.org,
linux-kernel@...r.kernel.org, support.opensource@...semi.com
Subject: Re: [PATCH v7 1/6] typec: tcpm: Add core support for sink side PPS
On 03/23/2018 03:12 AM, Adam Thomson wrote:
> This commit adds code to handle requesting of PPS APDOs. Switching
> between standard PDOs and APDOs, and re-requesting an APDO to
> modify operating voltage/current will be triggered by an
> external call into TCPM.
>
> Signed-off-by: Adam Thomson <Adam.Thomson.Opensource@...semi.com>
> Acked-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Reviewed-by: Guenter Roeck <linux@...ck-us.net>
> ---
> drivers/usb/typec/tcpm.c | 517 ++++++++++++++++++++++++++++++++++++++++++++++-
> include/linux/usb/pd.h | 4 +-
> include/linux/usb/tcpm.h | 1 +
> 3 files changed, 509 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/usb/typec/tcpm.c b/drivers/usb/typec/tcpm.c
> index 4c0fc54..1a66c9e 100644
> --- a/drivers/usb/typec/tcpm.c
> +++ b/drivers/usb/typec/tcpm.c
> @@ -47,6 +47,7 @@
> 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), \
> @@ -166,6 +167,16 @@ struct pd_mode_data {
> struct typec_altmode_desc altmode_desc[SVID_DISCOVERY_MAX];
> };
>
> +struct pd_pps_data {
> + u32 min_volt;
> + u32 max_volt;
> + u32 max_curr;
> + u32 out_volt;
> + u32 op_curr;
> + bool supported;
> + bool active;
> +};
> +
> struct tcpm_port {
> struct device *dev;
>
> @@ -233,6 +244,7 @@ struct tcpm_port {
> struct completion swap_complete;
> int swap_status;
>
> + unsigned int negotiated_rev;
> unsigned int message_id;
> unsigned int caps_count;
> unsigned int hard_reset_count;
> @@ -259,6 +271,7 @@ struct tcpm_port {
> unsigned int max_snk_ma;
> unsigned int max_snk_mw;
> unsigned int operating_snk_mw;
> + bool update_sink_caps;
>
> /* Requested current / voltage */
> u32 current_limit;
> @@ -275,8 +288,13 @@ struct tcpm_port {
> /* VDO to retry if UFP responder replied busy */
> u32 vdo_retry;
>
> - /* Alternate mode data */
> + /* PPS */
> + struct pd_pps_data pps_data;
> + struct completion pps_complete;
> + bool pps_pending;
> + int pps_status;
>
> + /* Alternate mode data */
> struct pd_mode_data mode_data;
> struct typec_altmode *partner_altmode[SVID_DISCOVERY_MAX];
> struct typec_altmode *port_altmode[SVID_DISCOVERY_MAX];
> @@ -494,6 +512,16 @@ static void tcpm_log_source_caps(struct tcpm_port *port)
> pdo_max_voltage(pdo),
> pdo_max_power(pdo));
> break;
> + case PDO_TYPE_APDO:
> + if (pdo_apdo_type(pdo) == APDO_TYPE_PPS)
> + scnprintf(msg, sizeof(msg),
> + "%u-%u mV, %u mA",
> + pdo_pps_apdo_min_voltage(pdo),
> + pdo_pps_apdo_max_voltage(pdo),
> + pdo_pps_apdo_max_current(pdo));
> + else
> + strcpy(msg, "undefined APDO");
> + break;
> default:
> strcpy(msg, "undefined");
> break;
> @@ -777,11 +805,13 @@ static int tcpm_pd_send_source_caps(struct tcpm_port *port)
> 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);
> }
> @@ -802,11 +832,13 @@ static int tcpm_pd_send_sink_caps(struct tcpm_port *port)
> 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);
> }
> @@ -1173,6 +1205,7 @@ static void vdm_run_state_machine(struct tcpm_port *port)
> 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]);
> @@ -1244,6 +1277,8 @@ enum pdo_err {
> 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[] = {
> @@ -1259,6 +1294,10 @@ enum pdo_err {
> " 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 tcpm_port *port, const u32 *pdo,
> @@ -1308,6 +1347,26 @@ static enum pdo_err tcpm_caps_err(struct tcpm_port *port, const u32 *pdo,
> pdo_min_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_current(pdo[i]) <
> + pdo_pps_apdo_max_current(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:
> tcpm_log_force(port, " Unknown pdo type");
> }
> @@ -1333,11 +1392,16 @@ static int tcpm_validate_caps(struct tcpm_port *port, const u32 *pdo,
> /*
> * PD (data, control) command handling functions
> */
> +
> +static int tcpm_pd_send_control(struct tcpm_port *port,
> + enum pd_ctrl_msg_type type);
> +
> static void tcpm_pd_data_request(struct tcpm_port *port,
> const struct pd_message *msg)
> {
> enum pd_data_msg_type type = pd_header_type_le(msg->header);
> unsigned int cnt = pd_header_cnt_le(msg->header);
> + unsigned int rev = pd_header_rev_le(msg->header);
> unsigned int i;
>
> switch (type) {
> @@ -1356,6 +1420,17 @@ static void tcpm_pd_data_request(struct tcpm_port *port,
> 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;
> +
> + /*
> * 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.
> @@ -1376,6 +1451,20 @@ static void tcpm_pd_data_request(struct tcpm_port *port,
> tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
> break;
> }
> +
> + /*
> + * 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(port, 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(port, SRC_NEGOTIATE_CAPABILITIES, 0);
> break;
> @@ -1400,6 +1489,15 @@ static void tcpm_pd_data_request(struct tcpm_port *port,
> }
> }
>
> +static void tcpm_pps_complete(struct tcpm_port *port, int result)
> +{
> + if (port->pps_pending) {
> + port->pps_status = result;
> + port->pps_pending = false;
> + complete(&port->pps_complete);
> + }
> +}
> +
> static void tcpm_pd_ctrl_request(struct tcpm_port *port,
> const struct pd_message *msg)
> {
> @@ -1476,6 +1574,14 @@ static void tcpm_pd_ctrl_request(struct tcpm_port *port,
> next_state = SNK_WAIT_CAPABILITIES;
> tcpm_set_state(port, next_state, 0);
> break;
> + case SNK_NEGOTIATE_PPS_CAPABILITIES:
> + /* Revert data back from any requested PPS updates */
> + port->pps_data.out_volt = port->supply_voltage;
> + port->pps_data.op_curr = port->current_limit;
> + port->pps_status = (type == PD_CTRL_WAIT ?
> + -EAGAIN : -EOPNOTSUPP);
> + tcpm_set_state(port, SNK_READY, 0);
> + break;
> case DR_SWAP_SEND:
> port->swap_status = (type == PD_CTRL_WAIT ?
> -EAGAIN : -EOPNOTSUPP);
> @@ -1498,6 +1604,13 @@ static void tcpm_pd_ctrl_request(struct tcpm_port *port,
> case PD_CTRL_ACCEPT:
> switch (port->state) {
> case SNK_NEGOTIATE_CAPABILITIES:
> + port->pps_data.active = false;
> + tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
> + break;
> + case SNK_NEGOTIATE_PPS_CAPABILITIES:
> + port->pps_data.active = true;
> + port->supply_voltage = port->pps_data.out_volt;
> + port->current_limit = port->pps_data.op_curr;
> tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
> break;
> case SOFT_RESET_SEND:
> @@ -1652,6 +1765,7 @@ static int tcpm_pd_send_control(struct tcpm_port *port,
> 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(port, TCPC_TX_SOP, &msg);
> @@ -1761,6 +1875,8 @@ static int tcpm_pd_select_pdo(struct tcpm_port *port)
> unsigned int i, max_mw = 0, max_mv = 0;
> int ret = -EINVAL;
>
> + port->pps_data.supported = false;
> +
> /*
> * Select the source PDO providing the most power while staying within
> * the board's voltage limits. Prefer PDO providing exp
> @@ -1770,20 +1886,41 @@ static int tcpm_pd_select_pdo(struct tcpm_port *port)
> enum pd_pdo_type type = pdo_type(pdo);
> unsigned int mv, ma, mw;
>
> - if (type == PDO_TYPE_FIXED)
> + switch (type) {
> + case PDO_TYPE_FIXED:
> mv = pdo_fixed_voltage(pdo);
> - else
> + break;
> + case PDO_TYPE_BATT:
> + case PDO_TYPE_VAR:
> mv = pdo_min_voltage(pdo);
> + break;
> + case PDO_TYPE_APDO:
> + if (pdo_apdo_type(pdo) == APDO_TYPE_PPS)
> + port->pps_data.supported = true;
> + continue;
> + default:
> + tcpm_log(port, "Invalid PDO type, ignoring");
> + continue;
> + }
>
> - if (type == PDO_TYPE_BATT) {
> - mw = pdo_max_power(pdo);
> - } else {
> + switch (type) {
> + case PDO_TYPE_FIXED:
> + case PDO_TYPE_VAR:
> ma = min(pdo_max_current(pdo),
> port->max_snk_ma);
> mw = ma * mv / 1000;
> + break;
> + case PDO_TYPE_BATT:
> + mw = pdo_max_power(pdo);
> + break;
> + case PDO_TYPE_APDO:
> + continue;
> + default:
> + tcpm_log(port, "Invalid PDO type, ignoring");
> + continue;
> }
>
> - /* Perfer higher voltages if available */
> + /* Prefer higher voltages if available */
> if ((mw > max_mw || (mw == max_mw && mv > max_mv)) &&
> mv <= port->max_snk_mv) {
> ret = i;
> @@ -1795,6 +1932,65 @@ static int tcpm_pd_select_pdo(struct tcpm_port *port)
> return ret;
> }
>
> +static unsigned int tcpm_pd_select_pps_apdo(struct tcpm_port *port)
> +{
> + unsigned int i, max_mw = 0, max_mv = 0;
> + unsigned int pps_min_mv, pps_max_mv, ma, mw;
> + enum pd_pdo_type type;
> + u32 pdo;
> + unsigned int index = 0;
> +
> + /*
> + * Select the source PPS APDO providing the most power while staying
> + * within the board's limits. We skip the first PDO as this is always
> + * 5V 3A.
> + */
> + for (i = 1; i < port->nr_source_caps; ++i) {
> + pdo = port->source_caps[i];
> + type = pdo_type(pdo);
> +
> + switch (type) {
> + case PDO_TYPE_APDO:
> + if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
> + tcpm_log(port, "Not PPS APDO, ignoring");
> + continue;
> + }
> +
> + pps_min_mv = pdo_pps_apdo_min_voltage(pdo);
> + pps_max_mv = pdo_pps_apdo_max_voltage(pdo);
> + ma = min(pdo_pps_apdo_max_current(pdo), port->max_snk_ma);
> + mw = (ma * pps_max_mv) / 1000;
> + break;
> + default:
> + tcpm_log(port, "Not APDO type, ignoring");
> + continue;
> + }
> +
> + /* Prefer higher voltages if available */
> + if ((mw > max_mw || (mw == max_mw && pps_max_mv > max_mv)) &&
> + pps_max_mv <= port->max_snk_mv) {
> + index = i;
> + max_mw = mw;
> + max_mv = pps_max_mv;
> + }
> + }
> +
> + if (index) {
> + pdo = port->source_caps[index];
> +
> + port->pps_data.min_volt = pdo_pps_apdo_min_voltage(pdo);
> + port->pps_data.max_volt = pdo_pps_apdo_max_voltage(pdo);
> + port->pps_data.max_curr =
> + min(pdo_pps_apdo_max_current(pdo), port->max_snk_ma);
> + port->pps_data.out_volt =
> + min(pdo_pps_apdo_max_voltage(pdo), port->pps_data.out_volt);
> + port->pps_data.op_curr =
> + min(pdo_pps_apdo_max_current(pdo), port->pps_data.op_curr);
> + }
> +
> + return index;
> +}
> +
> static int tcpm_pd_build_request(struct tcpm_port *port, u32 *rdo)
> {
> unsigned int mv, ma, mw, flags;
> @@ -1809,10 +2005,18 @@ static int tcpm_pd_build_request(struct tcpm_port *port, u32 *rdo)
> pdo = port->source_caps[index];
> type = pdo_type(pdo);
>
> - if (type == PDO_TYPE_FIXED)
> + switch (type) {
> + case PDO_TYPE_FIXED:
> mv = pdo_fixed_voltage(pdo);
> - else
> + break;
> + case PDO_TYPE_BATT:
> + case PDO_TYPE_VAR:
> mv = pdo_min_voltage(pdo);
> + break;
> + default:
> + tcpm_log(port, "Invalid PDO selected!");
> + return -EINVAL;
> + }
>
> /* Select maximum available current within the board's power limit */
> if (type == PDO_TYPE_BATT) {
> @@ -1875,6 +2079,105 @@ static int tcpm_pd_send_request(struct tcpm_port *port)
> 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(port, TCPC_TX_SOP, &msg);
> +}
> +
> +static int tcpm_pd_build_pps_request(struct tcpm_port *port, u32 *rdo)
> +{
> + unsigned int out_mv, op_ma, op_mw, min_mv, max_mv, max_ma, flags;
> + enum pd_pdo_type type;
> + int index;
> + u32 pdo;
> +
> + index = tcpm_pd_select_pps_apdo(port);
> + if (!index)
> + return -EOPNOTSUPP;
> +
> + pdo = port->source_caps[index];
> + type = pdo_type(pdo);
> +
> + switch (type) {
> + case PDO_TYPE_APDO:
> + if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
> + tcpm_log(port, "Invalid APDO selected!");
> + return -EINVAL;
> + }
> + min_mv = port->pps_data.min_volt;
> + max_mv = port->pps_data.max_volt;
> + max_ma = port->pps_data.max_curr;
> + out_mv = port->pps_data.out_volt;
> + op_ma = port->pps_data.op_curr;
> + break;
> + default:
> + tcpm_log(port, "Invalid PDO selected!");
> + return -EINVAL;
> + }
> +
> + flags = RDO_USB_COMM | RDO_NO_SUSPEND;
> +
> + op_mw = (op_ma * out_mv) / 1000;
> + if (op_mw < port->operating_snk_mw) {
> + /*
> + * Try raising current to meet power needs. If that's not enough
> + * then try upping the voltage. If that's still not enough
> + * then we've obviously chosen a PPS APDO which really isn't
> + * suitable so abandon ship.
> + */
> + op_ma = (port->operating_snk_mw * 1000) / out_mv;
> + if ((port->operating_snk_mw * 1000) % out_mv)
> + ++op_ma;
> + op_ma += RDO_PROG_CURR_MA_STEP - (op_ma % RDO_PROG_CURR_MA_STEP);
> +
> + if (op_ma > max_ma) {
> + op_ma = max_ma;
> + out_mv = (port->operating_snk_mw * 1000) / op_ma;
> + if ((port->operating_snk_mw * 1000) % op_ma)
> + ++out_mv;
> + out_mv += RDO_PROG_VOLT_MV_STEP -
> + (out_mv % RDO_PROG_VOLT_MV_STEP);
> +
> + if (out_mv > max_mv) {
> + tcpm_log(port, "Invalid PPS APDO selected!");
> + return -EINVAL;
> + }
> + }
> + }
> +
> + tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
> + port->cc_req, port->cc1, port->cc2, port->vbus_source,
> + port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
> + port->polarity);
> +
> + *rdo = RDO_PROG(index + 1, out_mv, op_ma, flags);
> +
> + tcpm_log(port, "Requesting APDO %d: %u mV, %u mA",
> + index, out_mv, op_ma);
> +
> + port->pps_data.op_curr = op_ma;
> + port->pps_data.out_volt = out_mv;
> +
> + return 0;
> +}
> +
> +static int tcpm_pd_send_pps_request(struct tcpm_port *port)
> +{
> + struct pd_message msg;
> + int ret;
> + u32 rdo;
> +
> + ret = tcpm_pd_build_pps_request(port, &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);
>
> @@ -2060,6 +2363,7 @@ static void tcpm_reset_port(struct tcpm_port *port)
> tcpm_typec_disconnect(port);
> port->attached = false;
> port->pd_capable = false;
> + port->pps_data.supported = false;
>
> /*
> * First Rx ID should be 0; set this to a sentinel of -1 so that
> @@ -2075,6 +2379,8 @@ static void tcpm_reset_port(struct tcpm_port *port)
> tcpm_set_attached_state(port, false);
> port->try_src_count = 0;
> port->try_snk_count = 0;
> + port->supply_voltage = 0;
> + port->current_limit = 0;
> }
>
> static void tcpm_detach(struct tcpm_port *port)
> @@ -2321,6 +2627,7 @@ static void run_state_machine(struct tcpm_port *port)
> typec_set_pwr_opmode(port->typec_port, opmode);
> port->pwr_opmode = TYPEC_PWR_MODE_USB;
> port->caps_count = 0;
> + port->negotiated_rev = PD_MAX_REV;
> port->message_id = 0;
> port->rx_msgid = -1;
> port->explicit_contract = false;
> @@ -2381,6 +2688,7 @@ static void run_state_machine(struct tcpm_port *port)
>
> tcpm_swap_complete(port, 0);
> tcpm_typec_connect(port);
> +
> tcpm_check_send_discover(port);
> /*
> * 6.3.5
> @@ -2404,6 +2712,7 @@ static void run_state_machine(struct tcpm_port *port)
> case SNK_UNATTACHED:
> if (!port->non_pd_role_swap)
> tcpm_swap_complete(port, -ENOTCONN);
> + tcpm_pps_complete(port, -ENOTCONN);
> tcpm_snk_detach(port);
> if (tcpm_start_drp_toggling(port)) {
> tcpm_set_state(port, DRP_TOGGLING, 0);
> @@ -2493,6 +2802,7 @@ static void run_state_machine(struct tcpm_port *port)
> port->cc2 : port->cc1);
> typec_set_pwr_opmode(port->typec_port, opmode);
> port->pwr_opmode = TYPEC_PWR_MODE_USB;
> + port->negotiated_rev = PD_MAX_REV;
> port->message_id = 0;
> port->rx_msgid = -1;
> port->explicit_contract = false;
> @@ -2563,6 +2873,24 @@ static void run_state_machine(struct tcpm_port *port)
> PD_T_SENDER_RESPONSE);
> }
> break;
> + case SNK_NEGOTIATE_PPS_CAPABILITIES:
> + ret = tcpm_pd_send_pps_request(port);
> + if (ret < 0) {
> + port->pps_status = ret;
> + /*
> + * If this was called due to updates to sink
> + * capabilities, and pps is no longer valid, we should
> + * safely fall back to a standard PDO.
> + */
> + if (port->update_sink_caps)
> + tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
> + else
> + tcpm_set_state(port, SNK_READY, 0);
> + } else {
> + tcpm_set_state_cond(port, hard_reset_state(port),
> + PD_T_SENDER_RESPONSE);
> + }
> + break;
> case SNK_TRANSITION_SINK:
> case SNK_TRANSITION_SINK_VBUS:
> tcpm_set_state(port, hard_reset_state(port),
> @@ -2570,6 +2898,7 @@ static void run_state_machine(struct tcpm_port *port)
> break;
> case SNK_READY:
> port->try_snk_count = 0;
> + port->update_sink_caps = false;
> if (port->explicit_contract) {
> typec_set_pwr_opmode(port->typec_port,
> TYPEC_PWR_MODE_PD);
> @@ -2579,6 +2908,8 @@ static void run_state_machine(struct tcpm_port *port)
> tcpm_swap_complete(port, 0);
> tcpm_typec_connect(port);
> tcpm_check_send_discover(port);
> + tcpm_pps_complete(port, port->pps_status);
> +
> break;
>
> /* Accessory states */
> @@ -2625,6 +2956,7 @@ static void run_state_machine(struct tcpm_port *port)
> tcpm_set_state(port, SRC_UNATTACHED, PD_T_PS_SOURCE_ON);
> break;
> case SNK_HARD_RESET_SINK_OFF:
> + memset(&port->pps_data, 0, sizeof(port->pps_data));
> tcpm_set_vconn(port, false);
> tcpm_set_charge(port, false);
> tcpm_set_roles(port, false, TYPEC_SINK, TYPEC_DEVICE);
> @@ -2845,6 +3177,7 @@ static void run_state_machine(struct tcpm_port *port)
> break;
> case ERROR_RECOVERY:
> tcpm_swap_complete(port, -EPROTO);
> + tcpm_pps_complete(port, -EPROTO);
> tcpm_set_state(port, PORT_RESET, 0);
> break;
> case PORT_RESET:
> @@ -3427,6 +3760,162 @@ static int tcpm_try_role(const struct typec_capability *cap, int role)
> return ret;
> }
>
> +static int tcpm_pps_set_op_curr(struct tcpm_port *port, u16 op_curr)
> +{
> + unsigned int target_mw;
> + int ret;
> +
> + mutex_lock(&port->swap_lock);
> + mutex_lock(&port->lock);
> +
> + if (!port->pps_data.active) {
> + ret = -EOPNOTSUPP;
> + goto port_unlock;
> + }
> +
> + if (port->state != SNK_READY) {
> + ret = -EAGAIN;
> + goto port_unlock;
> + }
> +
> + if (op_curr > port->pps_data.max_curr) {
> + ret = -EINVAL;
> + goto port_unlock;
> + }
> +
> + target_mw = (op_curr * port->pps_data.out_volt) / 1000;
> + if (target_mw < port->operating_snk_mw) {
> + ret = -EINVAL;
> + goto port_unlock;
> + }
> +
> + reinit_completion(&port->pps_complete);
> + 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,
> + msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
> + ret = -ETIMEDOUT;
> + else
> + ret = port->pps_status;
> +
> + goto swap_unlock;
> +
> +port_unlock:
> + mutex_unlock(&port->lock);
> +swap_unlock:
> + mutex_unlock(&port->swap_lock);
> +
> + return ret;
> +}
> +
> +static int tcpm_pps_set_out_volt(struct tcpm_port *port, u16 out_volt)
> +{
> + unsigned int target_mw;
> + int ret;
> +
> + mutex_lock(&port->swap_lock);
> + mutex_lock(&port->lock);
> +
> + if (!port->pps_data.active) {
> + ret = -EOPNOTSUPP;
> + goto port_unlock;
> + }
> +
> + if (port->state != SNK_READY) {
> + ret = -EAGAIN;
> + goto port_unlock;
> + }
> +
> + if (out_volt < port->pps_data.min_volt ||
> + out_volt > port->pps_data.max_volt) {
> + ret = -EINVAL;
> + goto port_unlock;
> + }
> +
> + target_mw = (port->pps_data.op_curr * out_volt) / 1000;
> + if (target_mw < port->operating_snk_mw) {
> + ret = -EINVAL;
> + goto port_unlock;
> + }
> +
> + reinit_completion(&port->pps_complete);
> + 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,
> + msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
> + ret = -ETIMEDOUT;
> + else
> + ret = port->pps_status;
> +
> + goto swap_unlock;
> +
> +port_unlock:
> + mutex_unlock(&port->lock);
> +swap_unlock:
> + mutex_unlock(&port->swap_lock);
> +
> + return ret;
> +}
> +
> +static int tcpm_pps_activate(struct tcpm_port *port, bool activate)
> +{
> + int ret = 0;
> +
> + mutex_lock(&port->swap_lock);
> + mutex_lock(&port->lock);
> +
> + if (!port->pps_data.supported) {
> + ret = -EOPNOTSUPP;
> + goto port_unlock;
> + }
> +
> + /* Trying to deactivate PPS when already deactivated so just bail */
> + if (!port->pps_data.active && !activate)
> + goto port_unlock;
> +
> + if (port->state != SNK_READY) {
> + ret = -EAGAIN;
> + goto port_unlock;
> + }
> +
> + reinit_completion(&port->pps_complete);
> + port->pps_status = 0;
> + port->pps_pending = true;
> +
> + /* Trigger PPS request or move back to standard PDO contract */
> + 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);
> +
> + if (!wait_for_completion_timeout(&port->pps_complete,
> + msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
> + ret = -ETIMEDOUT;
> + else
> + ret = port->pps_status;
> +
> + goto swap_unlock;
> +
> +port_unlock:
> + mutex_unlock(&port->lock);
> +swap_unlock:
> + mutex_unlock(&port->swap_lock);
> +
> + return ret;
> +}
> +
> static void tcpm_init(struct tcpm_port *port)
> {
> enum typec_cc_status cc1, cc2;
> @@ -3566,13 +4055,18 @@ int tcpm_update_sink_capabilities(struct tcpm_port *port, const u32 *pdo,
> port->max_snk_ma = max_snk_ma;
> port->max_snk_mw = max_snk_mw;
> port->operating_snk_mw = operating_snk_mw;
> + port->update_sink_caps = true;
>
> switch (port->state) {
> case SNK_NEGOTIATE_CAPABILITIES:
> + case SNK_NEGOTIATE_PPS_CAPABILITIES:
> case SNK_READY:
> case SNK_TRANSITION_SINK:
> case SNK_TRANSITION_SINK_VBUS:
> - tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
> + if (port->pps_data.active)
> + tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0);
> + else
> + tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
> break;
> default:
> break;
> @@ -3614,6 +4108,7 @@ struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc)
>
> init_completion(&port->tx_complete);
> init_completion(&port->swap_complete);
> + init_completion(&port->pps_complete);
> tcpm_debugfs_init(port);
>
> if (tcpm_validate_caps(port, tcpc->config->src_pdo,
> @@ -3642,7 +4137,7 @@ struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc)
> port->typec_caps.prefer_role = tcpc->config->default_role;
> port->typec_caps.type = tcpc->config->type;
> port->typec_caps.revision = 0x0120; /* Type-C spec release 1.2 */
> - port->typec_caps.pd_revision = 0x0200; /* USB-PD spec release 2.0 */
> + port->typec_caps.pd_revision = 0x0300; /* USB-PD spec release 3.0 */
> port->typec_caps.dr_set = tcpm_dr_set;
> port->typec_caps.pr_set = tcpm_pr_set;
> port->typec_caps.vconn_set = tcpm_vconn_set;
> diff --git a/include/linux/usb/pd.h b/include/linux/usb/pd.h
> index ff359bdf..09b570f 100644
> --- a/include/linux/usb/pd.h
> +++ b/include/linux/usb/pd.h
> @@ -103,8 +103,8 @@ enum pd_ext_msg_type {
> (((cnt) & PD_HEADER_CNT_MASK) << PD_HEADER_CNT_SHIFT) | \
> ((ext_hdr) ? PD_HEADER_EXT_HDR : 0))
>
> -#define PD_HEADER_LE(type, pwr, data, id, cnt) \
> - cpu_to_le16(PD_HEADER((type), (pwr), (data), PD_REV20, (id), (cnt), (0)))
> +#define PD_HEADER_LE(type, pwr, data, rev, id, cnt) \
> + cpu_to_le16(PD_HEADER((type), (pwr), (data), (rev), (id), (cnt), (0)))
>
> static inline unsigned int pd_header_cnt(u16 header)
> {
> diff --git a/include/linux/usb/tcpm.h b/include/linux/usb/tcpm.h
> index ca1c0b5..220ecc0 100644
> --- a/include/linux/usb/tcpm.h
> +++ b/include/linux/usb/tcpm.h
> @@ -36,6 +36,7 @@ enum typec_cc_polarity {
> /* Time to wait for TCPC to complete transmit */
> #define PD_T_TCPC_TX_TIMEOUT 100 /* in ms */
> #define PD_ROLE_SWAP_TIMEOUT (MSEC_PER_SEC * 10)
> +#define PD_PPS_CTRL_TIMEOUT (MSEC_PER_SEC * 10)
>
> enum tcpm_transmit_status {
> TCPC_TX_SUCCESS = 0,
>
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