[PATCH v5 1/5] typec: tcpm: Add core support for sink side PPS

From: Adam Thomson
Date: Tue Mar 20 2018 - 10:34:50 EST

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@xxxxxxxxxxx>
Acked-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
---
drivers/usb/typec/tcpm.c | 524 +++++++++++++++++++++++++++++++++++++++++++++--
include/linux/usb/pd.h | 4 +-
include/linux/usb/tcpm.h | 2 +-
3 files changed, 513 insertions(+), 17 deletions(-)

diff --git a/drivers/usb/typec/tcpm.c b/drivers/usb/typec/tcpm.c
index 4c0fc54..b4cf1ca 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 +1420,16 @@ 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;
+ else 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 +1450,19 @@ 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;
+ } else 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 +1487,15 @@ 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 +1572,14 @@ 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 +1602,13 @@ 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 +1763,7 @@ 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 +1873,8 @@ 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 +1884,41 @@ 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 +1930,65 @@ 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 +2003,18 @@ 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 +2077,105 @@ 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 +2361,7 @@ 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 +2377,8 @@ 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 +2625,7 @@ 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 +2686,7 @@ 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 +2710,7 @@ 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);
@@ -2412,6 +2719,7 @@ static void run_state_machine(struct tcpm_port *port)
tcpm_set_cc(port, TYPEC_CC_RD);
if (port->port_type == TYPEC_PORT_DRP)
tcpm_set_state(port, SRC_UNATTACHED, PD_T_DRP_SRC);
+
break;
case SNK_ATTACH_WAIT:
if ((port->cc1 == TYPEC_CC_OPEN &&
@@ -2493,6 +2801,7 @@ 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 +2872,24 @@ 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 +2897,7 @@ 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);
@@ -2578,7 +2906,11 @@ 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 +2957,7 @@ 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 +3178,7 @@ 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:
@@ -3310,7 +3644,7 @@ static int tcpm_dr_set(const struct typec_capability *cap,
mutex_unlock(&port->lock);

if (!wait_for_completion_timeout(&port->swap_complete,
- msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
+ msecs_to_jiffies(PD_STATE_MACHINE_TIMEOUT)))
ret = -ETIMEDOUT;
else
ret = port->swap_status;
@@ -3355,7 +3689,7 @@ static int tcpm_pr_set(const struct typec_capability *cap,
mutex_unlock(&port->lock);

if (!wait_for_completion_timeout(&port->swap_complete,
- msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
+ msecs_to_jiffies(PD_STATE_MACHINE_TIMEOUT)))
ret = -ETIMEDOUT;
else
ret = port->swap_status;
@@ -3395,7 +3729,7 @@ static int tcpm_vconn_set(const struct typec_capability *cap,
mutex_unlock(&port->lock);

if (!wait_for_completion_timeout(&port->swap_complete,
- msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
+ msecs_to_jiffies(PD_STATE_MACHINE_TIMEOUT)))
ret = -ETIMEDOUT;
else
ret = port->swap_status;
@@ -3427,6 +3761,162 @@ 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 = 0;
+
+ 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_STATE_MACHINE_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 = 0;
+
+ 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_STATE_MACHINE_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_STATE_MACHINE_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 +4056,18 @@ 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 +4109,7 @@ 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 +4138,7 @@ 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..d6673f7 100644
--- a/include/linux/usb/tcpm.h
+++ b/include/linux/usb/tcpm.h
@@ -35,7 +35,7 @@ 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_STATE_MACHINE_TIMEOUT (MSEC_PER_SEC * 10)

enum tcpm_transmit_status {
TCPC_TX_SUCCESS = 0,
--
1.9.1