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usb_pd_policy.c
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/* Copyright 2014 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "atomic.h"
#include "builtin/assert.h"
#include "charge_manager.h"
#include "chipset.h"
#include "common.h"
#include "console.h"
#include "cros_version.h"
#include "ec_commands.h"
#include "flash.h"
#include "gpio.h"
#include "hooks.h"
#include "host_command.h"
#include "mkbp_event.h"
#include "registers.h"
#include "rsa.h"
#include "sha256.h"
#include "system.h"
#include "task.h"
#include "tcpm/tcpm.h"
#include "timer.h"
#include "typec_control.h"
#include "usb_api.h"
#include "usb_common.h"
#include "usb_mux.h"
#include "usb_pd.h"
#include "usb_pd_tcpm.h"
#include "usbc_ppc.h"
#include "util.h"
#ifdef CONFIG_COMMON_RUNTIME
#define CPRINTS(format, args...) cprints(CC_USBPD, format, ##args)
#define CPRINTF(format, args...) cprintf(CC_USBPD, format, ##args)
#else
#define CPRINTS(format, args...)
#define CPRINTF(format, args...)
#endif
/*
* This file is currently only used for TCPMv1, and would need changes before
* being used for TCPMv2. One example: PD_FLAGS_* are TCPMv1 only.
*/
#ifndef CONFIG_USB_PD_TCPMV1
#error This file must only be used with TCPMv1
#endif
#ifdef CONFIG_USB_PD_ALT_MODE_DFP
#ifndef PORT_TO_HPD
#define PORT_TO_HPD(port) ((port) ? GPIO_USB_C1_DP_HPD : GPIO_USB_C0_DP_HPD)
#endif /* PORT_TO_HPD */
/* Tracker for which task is waiting on sysjump prep to finish */
static volatile task_id_t sysjump_task_waiting = TASK_ID_INVALID;
/*
* timestamp of the next possible toggle to ensure the 2-ms spacing
* between IRQ_HPD. Since this is used in overridable functions, this
* has to be global.
*/
uint64_t svdm_hpd_deadline[CONFIG_USB_PD_PORT_MAX_COUNT];
int dp_flags[CONFIG_USB_PD_PORT_MAX_COUNT];
uint32_t dp_status[CONFIG_USB_PD_PORT_MAX_COUNT];
/* Console command multi-function preference set for a PD port. */
__maybe_unused bool dp_port_mf_allow[CONFIG_USB_PD_PORT_MAX_COUNT] = {
[0 ... CONFIG_USB_PD_PORT_MAX_COUNT - 1] = true
};
__overridable const struct svdm_response svdm_rsp = {
.identity = NULL,
.svids = NULL,
.modes = NULL,
};
#endif /* CONFIG_USB_PD_ALT_MODE_DFP */
static int rw_flash_changed = 1;
__overridable void pd_check_pr_role(int port, enum pd_power_role pr_role,
int flags)
{
/*
* If partner is dual-role power and dualrole toggling is on, consider
* if a power swap is necessary.
*/
if ((flags & PD_FLAGS_PARTNER_DR_POWER) &&
pd_get_dual_role(port) == PD_DRP_TOGGLE_ON) {
/*
* If we are a sink and partner is not unconstrained, then
* swap to become a source. If we are source and partner is
* unconstrained, swap to become a sink.
*/
int partner_unconstrained = flags & PD_FLAGS_PARTNER_UNCONSTR;
if ((!partner_unconstrained && pr_role == PD_ROLE_SINK) ||
(partner_unconstrained && pr_role == PD_ROLE_SOURCE))
pd_request_power_swap(port);
}
}
__overridable void pd_check_dr_role(int port, enum pd_data_role dr_role,
int flags)
{
/* If UFP, try to switch to DFP */
if ((flags & PD_FLAGS_PARTNER_DR_DATA) && dr_role == PD_ROLE_UFP)
pd_request_data_swap(port);
}
/* Last received source cap */
static uint32_t pd_src_caps[CONFIG_USB_PD_PORT_MAX_COUNT][PDO_MAX_OBJECTS];
static uint8_t pd_src_cap_cnt[CONFIG_USB_PD_PORT_MAX_COUNT];
const uint32_t *const pd_get_src_caps(int port)
{
return pd_src_caps[port];
}
void pd_set_src_caps(int port, int cnt, uint32_t *src_caps)
{
int i;
pd_src_cap_cnt[port] = cnt;
for (i = 0; i < cnt; i++)
pd_src_caps[port][i] = *src_caps++;
}
uint8_t pd_get_src_cap_cnt(int port)
{
return pd_src_cap_cnt[port];
}
#ifdef CONFIG_USB_PD_ALT_MODE
#ifdef CONFIG_USB_PD_ALT_MODE_DFP
static struct pd_discovery discovery[CONFIG_USB_PD_PORT_MAX_COUNT]
[DISCOVERY_TYPE_COUNT];
static struct partner_active_modes partner_amodes[CONFIG_USB_PD_PORT_MAX_COUNT]
[AMODE_TYPE_COUNT];
void pd_dfp_discovery_init(int port)
{
memset(&discovery[port], 0, sizeof(struct pd_discovery));
}
void pd_dfp_mode_init(int port)
{
memset(&partner_amodes[port], 0, sizeof(partner_amodes[0]));
}
static int dfp_discover_svids(uint32_t *payload)
{
payload[0] = VDO(USB_SID_PD, 1, CMD_DISCOVER_SVID);
return 1;
}
struct pd_discovery *
pd_get_am_discovery_and_notify_access(int port, enum tcpci_msg_type type)
{
return (struct pd_discovery *)pd_get_am_discovery(port, type);
}
const struct pd_discovery *pd_get_am_discovery(int port,
enum tcpci_msg_type type)
{
return &discovery[port][type];
}
struct partner_active_modes *
pd_get_partner_active_modes(int port, enum tcpci_msg_type type)
{
assert(type < AMODE_TYPE_COUNT);
return &partner_amodes[port][type];
}
/* Note: Enter mode flag is not needed by TCPMv1 */
void pd_set_dfp_enter_mode_flag(int port, bool set)
{
}
/**
* Return the discover alternate mode payload data
*
* @param port USB-C port number
* @param payload Pointer to payload data to fill
* @return 1 if valid SVID present else 0
*/
static int dfp_discover_modes(int port, uint32_t *payload)
{
const struct pd_discovery *disc =
pd_get_am_discovery(port, TCPCI_MSG_SOP);
uint16_t svid = disc->svids[disc->svid_idx].svid;
if (disc->svid_idx >= disc->svid_cnt)
return 0;
payload[0] = VDO(svid, 1, CMD_DISCOVER_MODES);
return 1;
}
static int process_am_discover_ident_sop(int port, int cnt, uint32_t head,
uint32_t *payload,
enum tcpci_msg_type *rtype)
{
pd_dfp_discovery_init(port);
pd_dfp_mode_init(port);
dfp_consume_identity(port, TCPCI_MSG_SOP, cnt, payload);
return dfp_discover_svids(payload);
}
static int process_am_discover_svids(int port, int cnt, uint32_t *payload,
enum tcpci_msg_type sop,
enum tcpci_msg_type *rtype)
{
/*
* The pd_discovery structure stores SOP and SOP' discovery results
* separately, but TCPMv1 depends on one-dimensional storage of SVIDs
* and modes. Therefore, always use TCPCI_MSG_SOP in TCPMv1.
*/
dfp_consume_svids(port, sop, cnt, payload);
return dfp_discover_modes(port, payload);
}
#endif /* CONFIG_USB_PD_ALT_MODE_DFP */
int pd_svdm(int port, int cnt, uint32_t *payload, uint32_t **rpayload,
uint32_t head, enum tcpci_msg_type *rtype)
{
int cmd = PD_VDO_CMD(payload[0]);
int cmd_type = PD_VDO_CMDT(payload[0]);
int (*func)(int port, uint32_t *payload) = NULL;
int rsize = 1; /* VDM header at a minimum */
#ifdef CONFIG_USB_PD_ALT_MODE_DFP
enum tcpci_msg_type sop = PD_HEADER_GET_SOP(head);
#endif
/* Transmit SOP messages by default */
*rtype = TCPCI_MSG_SOP;
payload[0] &= ~VDO_CMDT_MASK;
*rpayload = payload;
if (cmd_type == CMDT_INIT) {
switch (cmd) {
case CMD_DISCOVER_IDENT:
func = svdm_rsp.identity;
break;
case CMD_DISCOVER_SVID:
func = svdm_rsp.svids;
break;
case CMD_DISCOVER_MODES:
func = svdm_rsp.modes;
break;
case CMD_ENTER_MODE:
func = svdm_rsp.enter_mode;
break;
case CMD_DP_STATUS:
if (svdm_rsp.amode)
func = svdm_rsp.amode->status;
break;
case CMD_DP_CONFIG:
if (svdm_rsp.amode)
func = svdm_rsp.amode->config;
break;
case CMD_EXIT_MODE:
func = svdm_rsp.exit_mode;
break;
#ifdef CONFIG_USB_PD_ALT_MODE_DFP
case CMD_ATTENTION:
/*
* attention is only SVDM with no response
* (just goodCRC) return zero here.
*/
dfp_consume_attention(port, payload);
return 0;
#endif
default:
CPRINTF("ERR:CMD:%d\n", cmd);
rsize = 0;
}
if (func)
rsize = func(port, payload);
else /* not supported : NACK it */
rsize = 0;
if (rsize >= 1)
payload[0] |= VDO_CMDT(CMDT_RSP_ACK);
else if (!rsize) {
payload[0] |= VDO_CMDT(CMDT_RSP_NAK);
rsize = 1;
} else {
payload[0] |= VDO_CMDT(CMDT_RSP_BUSY);
rsize = 1;
}
payload[0] |=
VDO_SVDM_VERS(pd_get_vdo_ver(port, TCPCI_MSG_SOP));
} else if (cmd_type == CMDT_RSP_ACK) {
#ifdef CONFIG_USB_PD_ALT_MODE_DFP
struct svdm_amode_data *modep;
modep = pd_get_amode_data(port, TCPCI_MSG_SOP,
PD_VDO_VID(payload[0]));
#endif
switch (cmd) {
#ifdef CONFIG_USB_PD_ALT_MODE_DFP
case CMD_DISCOVER_IDENT:
/* Received a SOP Discover Ident Message */
rsize = process_am_discover_ident_sop(port, cnt, head,
payload, rtype);
break;
case CMD_DISCOVER_SVID:
rsize = process_am_discover_svids(port, cnt, payload,
sop, rtype);
break;
case CMD_DISCOVER_MODES:
dfp_consume_modes(port, sop, cnt, payload);
rsize = dfp_discover_modes(port, payload);
/* enter the default mode for DFP */
if (!rsize) {
payload[0] = pd_dfp_enter_mode(
port, TCPCI_MSG_SOP, 0, 0);
if (payload[0])
rsize = 1;
}
break;
case CMD_ENTER_MODE:
if (!modep) {
rsize = 0;
} else {
if (!modep->opos)
pd_dfp_enter_mode(port, TCPCI_MSG_SOP,
0, 0);
if (modep->opos) {
rsize = modep->fx->status(port,
payload);
payload[0] |= PD_VDO_OPOS(modep->opos);
}
}
break;
case CMD_DP_STATUS:
/*
* Note: DP status response & UFP's DP attention have
* the same payload
*/
dfp_consume_attention(port, payload);
if (modep && modep->opos) {
/*
* Place the USB Type-C pins that are to be
* re-configured to DisplayPort Configuration
* into the Safe state. For USB_PD_MUX_DOCK,
* the superspeed signals can remain connected.
* For USB_PD_MUX_DP_ENABLED, disconnect the
* superspeed signals here, before the pins are
* re-configured to DisplayPort (in
* svdm_dp_post_config, when we receive the
* config ack).
*/
if (svdm_dp_get_mux_mode(port) ==
USB_PD_MUX_DP_ENABLED)
usb_mux_set_safe_mode(port);
rsize = modep->fx->config(port, payload);
} else {
rsize = 0;
}
break;
case CMD_DP_CONFIG:
if (modep && modep->opos && modep->fx->post_config)
modep->fx->post_config(port);
/* no response after DFPs ack */
rsize = 0;
break;
case CMD_EXIT_MODE:
/* no response after DFPs ack */
rsize = 0;
break;
#endif
case CMD_ATTENTION:
/* no response after DFPs ack */
rsize = 0;
break;
default:
CPRINTF("ERR:CMD:%d\n", cmd);
rsize = 0;
}
payload[0] |= VDO_CMDT(CMDT_INIT);
payload[0] |=
VDO_SVDM_VERS(pd_get_vdo_ver(port, TCPCI_MSG_SOP));
#ifdef CONFIG_USB_PD_ALT_MODE_DFP
} else if (cmd_type == CMDT_RSP_BUSY) {
switch (cmd) {
case CMD_DISCOVER_IDENT:
case CMD_DISCOVER_SVID:
case CMD_DISCOVER_MODES:
/* resend if its discovery */
rsize = 1;
break;
case CMD_ENTER_MODE:
/* Error */
CPRINTF("ERR:ENTBUSY\n");
rsize = 0;
break;
case CMD_EXIT_MODE:
rsize = 0;
break;
default:
rsize = 0;
}
} else if (cmd_type == CMDT_RSP_NAK) {
rsize = 0;
#endif /* CONFIG_USB_PD_ALT_MODE_DFP */
} else {
CPRINTF("ERR:CMDT:%d\n", cmd);
/* do not answer */
rsize = 0;
}
return rsize;
}
#else
int pd_svdm(int port, int cnt, uint32_t *payload, uint32_t **rpayload,
uint32_t head, enum tcpci_msg_type *rtype)
{
return 0;
}
#endif /* CONFIG_USB_PD_ALT_MODE */
#define FW_RW_END \
(CONFIG_EC_WRITABLE_STORAGE_OFF + CONFIG_RW_STORAGE_OFF + \
CONFIG_RW_SIZE)
uint8_t *flash_hash_rw(void)
{
static struct sha256_ctx ctx;
/* re-calculate RW hash when changed as its time consuming */
if (rw_flash_changed) {
rw_flash_changed = 0;
SHA256_init(&ctx);
SHA256_update(&ctx,
(void *)CONFIG_PROGRAM_MEMORY_BASE +
CONFIG_RW_MEM_OFF,
CONFIG_RW_SIZE - RSANUMBYTES);
return SHA256_final(&ctx);
} else {
return ctx.buf;
}
}
void pd_get_info(uint32_t *info_data)
{
void *rw_hash = flash_hash_rw();
/* copy first 20 bytes of RW hash */
memcpy(info_data, rw_hash, 5 * sizeof(uint32_t));
/* copy other info into data msg */
#if defined(CONFIG_USB_PD_HW_DEV_ID_BOARD_MAJOR) && \
defined(CONFIG_USB_PD_HW_DEV_ID_BOARD_MINOR)
info_data[5] = VDO_INFO(CONFIG_USB_PD_HW_DEV_ID_BOARD_MAJOR,
CONFIG_USB_PD_HW_DEV_ID_BOARD_MINOR,
ver_get_num_commits(system_get_image_copy()),
(system_get_image_copy() != EC_IMAGE_RO));
#else
info_data[5] = 0;
#endif
}
int pd_custom_flash_vdm(int port, int cnt, uint32_t *payload)
{
static int flash_offset;
int rsize = 1; /* default is just VDM header returned */
switch (PD_VDO_CMD(payload[0])) {
case VDO_CMD_VERSION:
memcpy(payload + 1, ¤t_image_data.version, 24);
rsize = 7;
break;
case VDO_CMD_REBOOT:
/* ensure the power supply is in a safe state */
pd_power_supply_reset(0);
system_reset(0);
break;
case VDO_CMD_READ_INFO:
/* copy info into response */
pd_get_info(payload + 1);
rsize = 7;
break;
case VDO_CMD_FLASH_ERASE:
/* do not kill the code under our feet */
if (system_get_image_copy() != EC_IMAGE_RO)
break;
pd_log_event(PD_EVENT_ACC_RW_ERASE, 0, 0, NULL);
flash_offset =
CONFIG_EC_WRITABLE_STORAGE_OFF + CONFIG_RW_STORAGE_OFF;
crec_flash_physical_erase(CONFIG_EC_WRITABLE_STORAGE_OFF +
CONFIG_RW_STORAGE_OFF,
CONFIG_RW_SIZE);
rw_flash_changed = 1;
break;
case VDO_CMD_FLASH_WRITE:
/* do not kill the code under our feet */
if ((system_get_image_copy() != EC_IMAGE_RO) ||
(flash_offset <
CONFIG_EC_WRITABLE_STORAGE_OFF + CONFIG_RW_STORAGE_OFF))
break;
crec_flash_physical_write(flash_offset, 4 * (cnt - 1),
(const char *)(payload + 1));
flash_offset += 4 * (cnt - 1);
rw_flash_changed = 1;
break;
case VDO_CMD_ERASE_SIG:
/* this is not touching the code area */
{
uint32_t zero = 0;
int offset;
/* zeroes the area containing the RSA signature */
for (offset = FW_RW_END - RSANUMBYTES;
offset < FW_RW_END; offset += 4)
crec_flash_physical_write(offset, 4,
(const char *)&zero);
}
break;
default:
/* Unknown : do not answer */
return 0;
}
return rsize;
}
#ifdef CONFIG_USB_PD_ALT_MODE_DFP
static enum ec_status hc_remote_pd_set_amode(struct host_cmd_handler_args *args)
{
const struct ec_params_usb_pd_set_mode_request *p = args->params;
if ((p->port >= board_get_usb_pd_port_count()) || (!p->svid) ||
(!p->opos))
return EC_RES_INVALID_PARAM;
switch (p->cmd) {
case PD_EXIT_MODE:
if (pd_dfp_exit_mode(p->port, TCPCI_MSG_SOP, p->svid, p->opos))
pd_send_vdm(p->port, p->svid,
CMD_EXIT_MODE | VDO_OPOS(p->opos), NULL, 0);
else {
CPRINTF("Failed exit mode\n");
return EC_RES_ERROR;
}
break;
case PD_ENTER_MODE:
if (pd_dfp_enter_mode(p->port, TCPCI_MSG_SOP, p->svid, p->opos))
pd_send_vdm(p->port, p->svid,
CMD_ENTER_MODE | VDO_OPOS(p->opos), NULL,
0);
break;
default:
return EC_RES_INVALID_PARAM;
}
return EC_RES_SUCCESS;
}
DECLARE_HOST_COMMAND(EC_CMD_USB_PD_SET_AMODE, hc_remote_pd_set_amode,
EC_VER_MASK(0));
const uint32_t *pd_get_mode_vdo(int port, uint16_t svid_idx,
enum tcpci_msg_type type)
{
const struct pd_discovery *disc = pd_get_am_discovery(port, type);
return disc->svids[svid_idx].mode_vdo;
}
static enum ec_status hc_remote_pd_get_amode(struct host_cmd_handler_args *args)
{
struct svdm_amode_data *modep;
const struct ec_params_usb_pd_get_mode_request *p = args->params;
struct ec_params_usb_pd_get_mode_response *r = args->response;
if (p->port >= board_get_usb_pd_port_count())
return EC_RES_INVALID_PARAM;
/* no more to send */
/* TODO(b/148528713): Use TCPMv2's separate storage for SOP'. */
if (p->svid_idx >= pd_get_svid_count(p->port, TCPCI_MSG_SOP)) {
r->svid = 0;
args->response_size = sizeof(r->svid);
return EC_RES_SUCCESS;
}
r->svid = pd_get_svid(p->port, p->svid_idx, TCPCI_MSG_SOP);
r->opos = 0;
memcpy(r->vdo, pd_get_mode_vdo(p->port, p->svid_idx, TCPCI_MSG_SOP),
sizeof(uint32_t) * VDO_MAX_OBJECTS);
modep = pd_get_amode_data(p->port, TCPCI_MSG_SOP, r->svid);
if (modep)
r->opos = pd_alt_mode(p->port, TCPCI_MSG_SOP, r->svid);
args->response_size = sizeof(*r);
return EC_RES_SUCCESS;
}
DECLARE_HOST_COMMAND(EC_CMD_USB_PD_GET_AMODE, hc_remote_pd_get_amode,
EC_VER_MASK(0));
static int pd_get_mode_idx(int port, enum tcpci_msg_type type, uint16_t svid)
{
int amode_idx;
struct partner_active_modes *active =
pd_get_partner_active_modes(port, type);
for (amode_idx = 0; amode_idx < PD_AMODE_COUNT; amode_idx++) {
if (active->amodes[amode_idx].fx &&
(active->amodes[amode_idx].fx->svid == svid))
return amode_idx;
}
return -1;
}
static int pd_allocate_mode(int port, enum tcpci_msg_type type, uint16_t svid)
{
int i, j;
struct svdm_amode_data *modep;
int mode_idx = pd_get_mode_idx(port, type, svid);
const struct pd_discovery *disc = pd_get_am_discovery(port, type);
struct partner_active_modes *active =
pd_get_partner_active_modes(port, type);
assert(active);
if (mode_idx != -1)
return mode_idx;
/* There's no space to enter another mode */
if (active->amode_idx == PD_AMODE_COUNT) {
CPRINTF("ERR:NO AMODE SPACE\n");
return -1;
}
/* Allocate ... if SVID == 0 enter default supported policy */
for (i = 0; i < supported_modes_cnt; i++) {
for (j = 0; j < disc->svid_cnt; j++) {
const struct svid_mode_data *svidp = &disc->svids[j];
/*
* Looking for a match between supported_modes and
* discovered SVIDs; must also match the passed-in SVID
* if that was non-zero. Otherwise, go to the next
* discovered SVID.
* TODO(b/155890173): Support AP-directed mode entry
* where the mode is unknown to the TCPM.
*/
if ((svidp->svid != supported_modes[i].svid) ||
(svid && (svidp->svid != svid)))
continue;
modep = &active->amodes[active->amode_idx];
modep->fx = &supported_modes[i];
modep->data = &disc->svids[j];
active->amode_idx++;
return active->amode_idx - 1;
}
}
return -1;
}
static int validate_mode_request(struct svdm_amode_data *modep, uint16_t svid,
int opos)
{
if (!modep->fx)
return 0;
if (svid != modep->fx->svid) {
CPRINTF("ERR:svid r:0x%04x != c:0x%04x\n", svid,
modep->fx->svid);
return 0;
}
if (opos != modep->opos) {
CPRINTF("ERR:opos r:%d != c:%d\n", opos, modep->opos);
return 0;
}
return 1;
}
void pd_prepare_sysjump(void)
{
int i;
/* Exit modes before sysjump so we can cleanly enter again later */
for (i = 0; i < board_get_usb_pd_port_count(); i++) {
/*
* If the port is not capable of Alternate mode no need to
* send the event.
*/
if (!pd_alt_mode_capable(i))
continue;
sysjump_task_waiting = task_get_current();
task_set_event(PD_PORT_TO_TASK_ID(i), PD_EVENT_SYSJUMP);
task_wait_event_mask(TASK_EVENT_SYSJUMP_READY, -1);
sysjump_task_waiting = TASK_ID_INVALID;
}
}
#ifdef CONFIG_USB_PD_DP_MODE
/*
* This algorithm defaults to choosing higher pin config over lower ones in
* order to prefer multi-function if desired.
*
* NAME | SIGNALING | OUTPUT TYPE | MULTI-FUNCTION | PIN CONFIG
* -------------------------------------------------------------
* A | USB G2 | ? | no | 00_0001
* B | USB G2 | ? | yes | 00_0010
* C | DP | CONVERTED | no | 00_0100
* D | PD | CONVERTED | yes | 00_1000
* E | DP | DP | no | 01_0000
* F | PD | DP | yes | 10_0000
*
* if UFP has NOT asserted multi-function preferred code masks away B/D/F
* leaving only A/C/E. For single-output dongles that should leave only one
* possible pin config depending on whether its a converter DP->(VGA|HDMI) or DP
* output. If UFP is a USB-C receptacle it may assert C/D/E/F. The DFP USB-C
* receptacle must always choose C/D in those cases.
*/
int pd_dfp_dp_get_pin_mode(int port, uint32_t status)
{
struct svdm_amode_data *modep =
pd_get_amode_data(port, TCPCI_MSG_SOP, USB_SID_DISPLAYPORT);
uint32_t mode_caps;
uint32_t pin_caps;
int mf_pref;
/*
* Default dp_port_mf_allow is true, we allow mf operation
* if UFP_D supports it.
*/
if (IS_ENABLED(CONFIG_CMD_MFALLOW))
mf_pref = PD_VDO_DPSTS_MF_PREF(dp_status[port]) &&
dp_port_mf_allow[port];
else
mf_pref = PD_VDO_DPSTS_MF_PREF(dp_status[port]);
if (!modep)
return 0;
mode_caps = modep->data->mode_vdo[modep->opos - 1];
/* TODO(crosbug.com/p/39656) revisit with DFP that can be a sink */
pin_caps = PD_DP_PIN_CAPS(mode_caps);
/* if don't want multi-function then ignore those pin configs */
if (!mf_pref)
pin_caps &= ~MODE_DP_PIN_MF_MASK;
/* TODO(crosbug.com/p/39656) revisit if DFP drives USB Gen 2 signals */
pin_caps &= ~MODE_DP_PIN_BR2_MASK;
/* if C/D present they have precedence over E/F for USB-C->USB-C */
if (pin_caps & (MODE_DP_PIN_C | MODE_DP_PIN_D))
pin_caps &= ~(MODE_DP_PIN_E | MODE_DP_PIN_F);
/* get_next_bit returns undefined for zero */
if (!pin_caps)
return 0;
return 1 << get_next_bit(&pin_caps);
}
#endif /* CONFIG_USB_PD_DP_MODE */
struct svdm_amode_data *pd_get_amode_data(int port, enum tcpci_msg_type type,
uint16_t svid)
{
int idx = pd_get_mode_idx(port, type, svid);
struct partner_active_modes *active =
pd_get_partner_active_modes(port, type);
assert(active);
return (idx == -1) ? NULL : &active->amodes[idx];
}
/*
* Enter default mode ( payload[0] == 0 ) or attempt to enter mode via svid &
* opos
*/
uint32_t pd_dfp_enter_mode(int port, enum tcpci_msg_type type, uint16_t svid,
int opos)
{
int mode_idx = pd_allocate_mode(port, type, svid);
struct svdm_amode_data *modep;
uint32_t mode_caps;
if (mode_idx == -1)
return 0;
modep = &pd_get_partner_active_modes(port, type)->amodes[mode_idx];
if (!opos) {
/* choose the lowest as default */
modep->opos = 1;
} else if (opos <= modep->data->mode_cnt) {
modep->opos = opos;
} else {
CPRINTS("C%d: Invalid opos %d for SVID %x", port, opos, svid);
return 0;
}
mode_caps = modep->data->mode_vdo[modep->opos - 1];
if (modep->fx->enter(port, mode_caps) == -1)
return 0;
/*
* Strictly speaking, this should only happen when the request
* has been ACKed.
* For TCPMV1, still set modal flag pre-emptively. For TCPMv2, the modal
* flag is set when the ENTER command is ACK'd for each alt mode that is
* supported.
*/
if (IS_ENABLED(CONFIG_USB_PD_TCPMV1))
pd_set_dfp_enter_mode_flag(port, true);
/* SVDM to send to UFP for mode entry */
return VDO(modep->fx->svid, 1, CMD_ENTER_MODE | VDO_OPOS(modep->opos));
}
int pd_dfp_exit_mode(int port, enum tcpci_msg_type type, uint16_t svid,
int opos)
{
struct svdm_amode_data *modep;
struct partner_active_modes *active =
pd_get_partner_active_modes(port, type);
int idx;
/*
* Empty svid signals we should reset DFP VDM state by exiting all
* entered modes then clearing state. This occurs when we've
* disconnected or for hard reset.
*/
if (!svid) {
for (idx = 0; idx < PD_AMODE_COUNT; idx++)
if (active->amodes[idx].fx)
active->amodes[idx].fx->exit(port);
pd_dfp_mode_init(port);
return 0;
}
/*
* TODO(crosbug.com/p/33946) : below needs revisited to allow multiple
* mode exit. Additionally it should honor OPOS == 7 as DFP's request
* to exit all modes. We currently don't have any UFPs that support
* multiple modes on one SVID.
*/
modep = pd_get_amode_data(port, type, svid);
if (!modep || !validate_mode_request(modep, svid, opos))
return 0;
/* call DFPs exit function */
modep->fx->exit(port);
pd_set_dfp_enter_mode_flag(port, false);
/* exit the mode */
modep->opos = 0;
return 1;
}
void dfp_consume_attention(int port, uint32_t *payload)
{
uint16_t svid = PD_VDO_VID(payload[0]);
int opos = PD_VDO_OPOS(payload[0]);
struct svdm_amode_data *modep =
pd_get_amode_data(port, TCPCI_MSG_SOP, svid);
if (!modep || !validate_mode_request(modep, svid, opos))
return;
if (modep->fx->attention)
modep->fx->attention(port, payload);
}
int pd_alt_mode(int port, enum tcpci_msg_type type, uint16_t svid)
{
struct svdm_amode_data *modep = pd_get_amode_data(port, type, svid);
return (modep) ? modep->opos : -1;
}
void notify_sysjump_ready(void)
{
/*
* If event was set from pd_prepare_sysjump, wake the
* task waiting on us to complete.
*/
if (sysjump_task_waiting != TASK_ID_INVALID)
task_set_event(sysjump_task_waiting, TASK_EVENT_SYSJUMP_READY);
}
#ifdef CONFIG_USB_PD_DP_MODE
__overridable void svdm_safe_dp_mode(int port)
{
/* make DP interface safe until configure */
dp_flags[port] = 0;
dp_status[port] = 0;
usb_mux_set_safe_mode(port);
}
__overridable int svdm_enter_dp_mode(int port, uint32_t mode_caps)
{
/*
* Don't enter the mode if the SoC is off.
*
* There's no need to enter the mode while the SoC is off; we'll
* actually enter the mode on the chipset resume hook. Entering DP Alt
* Mode twice will confuse some monitors and require and unplug/replug
* to get them to work again. The DP Alt Mode on USB-C spec says that
* if we don't need to maintain HPD connectivity info in a low power
* mode, then we shall exit DP Alt Mode. (This is why we don't enter
* when the SoC is off as opposed to suspend where adding a display
* could cause a wake up.) When in S5->S3 transition state, we
* should treat it as a SoC off state.
*/
#ifdef CONFIG_AP_POWER_CONTROL
if (!chipset_in_state(CHIPSET_STATE_ANY_SUSPEND | CHIPSET_STATE_ON))
return -1;
#endif
/*
* TCPMv2: Enable logging of CCD line state CCD_MODE_ODL.
* DisplayPort Alternate mode requires that the SBU lines are
* used for AUX communication. However, in Chromebooks SBU
* signals are repurposed as USB2 signals for CCD. This
* functionality is accomplished by override fets whose state is
* controlled by CCD_MODE_ODL.
*
* This condition helps in debugging unexpected AUX timeout
* issues by indicating the state of the CCD override fets.
*/
#ifdef GPIO_CCD_MODE_ODL
if (!gpio_get_level(GPIO_CCD_MODE_ODL))
CPRINTS("WARNING: Tried to EnterMode DP with [CCD on AUX/SBU]");
#endif
/* Only enter mode if device is DFP_D capable */
if (mode_caps & MODE_DP_SNK) {
svdm_safe_dp_mode(port);
if (IS_ENABLED(CONFIG_MKBP_EVENT) &&
chipset_in_state(CHIPSET_STATE_ANY_SUSPEND))
/*
* Wake the system up since we're entering DP AltMode.
*/
pd_notify_dp_alt_mode_entry(port);
return 0;
}
return -1;
}
__overridable int svdm_dp_status(int port, uint32_t *payload)
{
int opos = pd_alt_mode(port, TCPCI_MSG_SOP, USB_SID_DISPLAYPORT);
payload[0] =
VDO(USB_SID_DISPLAYPORT, 1, CMD_DP_STATUS | VDO_OPOS(opos));
payload[1] = VDO_DP_STATUS(0, /* HPD IRQ ... not applicable */
0, /* HPD level ... not applicable */
0, /* exit DP? ... no */
0, /* usb mode? ... no */
0, /* multi-function ... no */
(!!(dp_flags[port] & DP_FLAGS_DP_ON)),
0, /* power low? ... no */
(!!DP_FLAGS_DP_ON));
return 2;
};
__overridable uint8_t get_dp_pin_mode(int port)
{
return pd_dfp_dp_get_pin_mode(port, dp_status[port]);
}
mux_state_t svdm_dp_get_mux_mode(int port)
{
int pin_mode = get_dp_pin_mode(port);
/* Default dp_port_mf_allow is true */
int mf_pref;