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/* Copyright 2020 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/*
* DisplayPort alternate mode support
* Refer to VESA DisplayPort Alt Mode on USB Type-C Standard, version 2.0,
* section 5.2
*/
#include <stdbool.h>
#include <stdint.h>
#include "assert.h"
#include "usb_pd.h"
#include "usb_dp_alt_mode.h"
#include "usb_pd_dpm.h"
#include "usb_pd_tcpm.h"
#ifdef CONFIG_COMMON_RUNTIME
#define CPRINTF(format, args...) cprintf(CC_USBPD, format, ## args)
#define CPRINTS(format, args...) cprints(CC_USBPD, format, ## args)
#else
#define CPRINTF(format, args...)
#define CPRINTS(format, args...)
#endif
/* The next VDM command to send for DP setup */
static int next_vdm_cmd[CONFIG_USB_PD_PORT_MAX_COUNT];
void dp_init(int port)
{
dp_reset_next_command(port);
}
static void print_unexpected_response(int port, enum tcpm_transmit_type type,
int vdm_cmd_type, int vdm_cmd)
{
char *cmdt_str;
switch (vdm_cmd_type) {
case CMDT_RSP_ACK:
cmdt_str = "ACK";
break;
case CMDT_RSP_NAK:
cmdt_str = "NAK";
break;
default:
assert(false);
}
CPRINTS("C%d: Received unexpected DP VDM %s (cmd %d) from %s", port,
cmdt_str, vdm_cmd,
type == TCPC_TX_SOP ? "port partner" : "cable plug");
}
void dp_vdm_acked(int port, enum tcpm_transmit_type type, int vdo_count,
uint32_t *vdm)
{
const struct svdm_amode_data *modep =
pd_get_amode_data(port, type, USB_SID_DISPLAYPORT);
const uint8_t vdm_cmd = PD_VDO_CMD(vdm[0]);
/*
* Handle the ACK of a request to exit alt mode.
*/
if (type == TCPC_TX_SOP && vdm_cmd == CMD_EXIT_MODE) {
pd_dfp_discovery_init(port);
return;
}
if (type != TCPC_TX_SOP || next_vdm_cmd[port] != vdm_cmd) {
print_unexpected_response(port, type, CMDT_RSP_ACK, vdm_cmd);
dpm_set_mode_entry_done(port);
return;
}
/* TODO(b/155890173): Validate VDO count for specific commands */
switch (vdm_cmd) {
case CMD_ENTER_MODE:
next_vdm_cmd[port] = CMD_DP_STATUS;
break;
case CMD_DP_STATUS:
/* DP status response & UFP's DP attention have same payload. */
dfp_consume_attention(port, vdm);
next_vdm_cmd[port] = CMD_DP_CONFIG;
break;
case CMD_DP_CONFIG:
if (modep && modep->opos && modep->fx->post_config)
modep->fx->post_config(port);
dpm_set_mode_entry_done(port);
break;
default:
/* This should never happen */
assert(false);
}
}
void dp_vdm_naked(int port, enum tcpm_transmit_type type, uint8_t vdm_cmd)
{
if (type != TCPC_TX_SOP || next_vdm_cmd[port] != vdm_cmd) {
print_unexpected_response(port, type, CMDT_RSP_NAK, vdm_cmd);
return;
}
dpm_set_mode_entry_done(port);
}
void dp_reset_next_command(int port)
{
next_vdm_cmd[port] = CMD_ENTER_MODE;
}
int dp_setup_next_vdm(int port, int vdo_count, uint32_t *vdm)
{
const struct svdm_amode_data *modep = pd_get_amode_data(port,
TCPC_TX_SOP, USB_SID_DISPLAYPORT);
int vdo_count_ret;
if (vdo_count < VDO_MAX_SIZE)
return -1;
switch (next_vdm_cmd[port]) {
case CMD_ENTER_MODE:
/* Enter the first supported mode for DisplayPort. */
vdm[0] = pd_dfp_enter_mode(port, TCPC_TX_SOP,
USB_SID_DISPLAYPORT, 0);
if (vdm[0] == 0)
return -1;
/* CMDT_INIT is 0, so this is a no-op */
vdm[0] |= VDO_CMDT(CMDT_INIT);
vdm[0] |= VDO_SVDM_VERS(pd_get_vdo_ver(port, TCPC_TX_SOP));
vdo_count_ret = 1;
break;
case CMD_DP_STATUS:
if (!(modep && modep->opos))
return -1;
vdo_count_ret = modep->fx->status(port, vdm);
if (vdo_count_ret == 0)
return -1;
vdm[0] |= PD_VDO_OPOS(modep->opos);
vdm[0] |= VDO_CMDT(CMDT_INIT);
vdm[0] |= VDO_SVDM_VERS(pd_get_vdo_ver(port, TCPC_TX_SOP));
break;
case CMD_DP_CONFIG:
if (!(modep && modep->opos))
return -1;
vdo_count_ret = modep->fx->config(port, vdm);
if (vdo_count_ret == 0)
return -1;
vdm[0] |= VDO_CMDT(CMDT_INIT);
vdm[0] |= VDO_SVDM_VERS(pd_get_vdo_ver(port, TCPC_TX_SOP));
break;
default:
CPRINTF("%s called with invalid next VDM command %d\n",
__func__, next_vdm_cmd[port]);
return -1;
}
return vdo_count_ret;
}
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