1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
|
/* 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.
*/
/*
* Device Policy Manager implementation
* Refer to USB PD 3.0 spec, version 2.0, sections 8.2 and 8.3
*/
#include "charge_state.h"
#include "compile_time_macros.h"
#include "console.h"
#include "usb_dp_alt_mode.h"
#include "usb_mode.h"
#include "usb_pd.h"
#include "usb_pd_dpm.h"
#include "usb_tbt_alt_mode.h"
#include "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
static struct {
bool mode_entry_done;
bool mode_exit_request;
} dpm[CONFIG_USB_PD_PORT_MAX_COUNT];
void dpm_init(int port)
{
dpm[port].mode_entry_done = false;
dpm[port].mode_exit_request = false;
}
static void dpm_set_mode_entry_done(int port)
{
dpm[port].mode_entry_done = true;
}
void dpm_set_mode_exit_request(int port)
{
dpm[port].mode_exit_request = true;
}
static inline void dpm_clear_mode_exit_request(int port)
{
dpm[port].mode_exit_request = false;
}
void dpm_vdm_acked(int port, enum tcpm_transmit_type type, int vdo_count,
uint32_t *vdm)
{
const uint16_t svid = PD_VDO_VID(vdm[0]);
assert(vdo_count >= 1);
switch (svid) {
case USB_SID_DISPLAYPORT:
dp_vdm_acked(port, type, vdo_count, vdm);
break;
case USB_VID_INTEL:
if (IS_ENABLED(CONFIG_USB_PD_TBT_COMPAT_MODE)) {
intel_vdm_acked(port, type, vdo_count, vdm);
break;
}
default:
CPRINTS("C%d: Received unexpected VDM ACK for SVID %d", port,
svid);
}
}
void dpm_vdm_naked(int port, enum tcpm_transmit_type type, uint16_t svid,
uint8_t vdm_cmd)
{
switch (svid) {
case USB_SID_DISPLAYPORT:
dp_vdm_naked(port, type, vdm_cmd);
break;
case USB_VID_INTEL:
if (IS_ENABLED(CONFIG_USB_PD_TBT_COMPAT_MODE)) {
intel_vdm_naked(port, type, vdm_cmd);
break;
}
default:
CPRINTS("C%d: Received unexpected VDM NAK for SVID %d", port,
svid);
}
}
/*
* The call to this function requests that the PE send one VDM, whichever is
* next in the mode entry sequence. This only happens if preconditions for mode
* entry are met.
*/
static void dpm_attempt_mode_entry(int port)
{
int vdo_count = 0;
uint32_t vdm[VDO_MAX_SIZE];
enum tcpm_transmit_type tx_type = TCPC_TX_SOP;
if (pd_get_data_role(port) != PD_ROLE_DFP)
return;
/*
* Do not try to enter mode while CPU is off.
* CPU transitions (e.g b/158634281) can occur during the discovery
* phase or during enter/exit negotiations, and the state
* of the modes can get out of sync, causing the attempt to
* enter the mode to fail prematurely.
*/
if (chipset_in_or_transitioning_to_state(CHIPSET_STATE_ANY_OFF))
return;
/*
* If discovery has not occurred for modes, do not attempt to switch
* to alt mode.
*/
if (pd_get_svids_discovery(port, TCPC_TX_SOP) != PD_DISC_COMPLETE ||
pd_get_modes_discovery(port, TCPC_TX_SOP) != PD_DISC_COMPLETE)
return;
if (dp_entry_is_done(port) ||
(IS_ENABLED(CONFIG_USB_PD_TBT_COMPAT_MODE) &&
tbt_entry_is_done(port)) ||
(IS_ENABLED(CONFIG_USB_PD_USB4) && enter_usb_entry_is_done(port))) {
dpm_set_mode_entry_done(port);
return;
}
/* Check if the device and cable support USB4. */
if (IS_ENABLED(CONFIG_USB_PD_USB4) && enter_usb_is_capable(port)) {
pd_dpm_request(port, DPM_REQUEST_ENTER_USB);
return;
}
/* If not, check if they support Thunderbolt alt mode. */
if (IS_ENABLED(CONFIG_USB_PD_TBT_COMPAT_MODE) &&
pd_is_mode_discovered_for_svid(port, TCPC_TX_SOP, USB_VID_INTEL))
vdo_count = tbt_setup_next_vdm(port,
ARRAY_SIZE(vdm), vdm, &tx_type);
/* If not, check if they support DisplayPort alt mode. */
if (vdo_count == 0 && !dpm[port].mode_entry_done &&
pd_is_mode_discovered_for_svid(port, TCPC_TX_SOP,
USB_SID_DISPLAYPORT))
vdo_count = dp_setup_next_vdm(port, ARRAY_SIZE(vdm), vdm);
/*
* If the PE didn't discover any supported alternate mode, just mark
* setup done and get out of here.
*/
if (vdo_count == 0 && !dpm[port].mode_entry_done) {
CPRINTS("C%d: No supported alt mode discovered", port);
dpm_set_mode_entry_done(port);
return;
}
if (vdo_count < 0) {
dpm_set_mode_entry_done(port);
CPRINTS("C%d: Couldn't construct alt mode VDM", port);
return;
}
/*
* TODO(b/155890173): Provide a host command to request that the PE send
* an arbitrary VDM via this mechanism.
*/
if (!pd_setup_vdm_request(port, tx_type, vdm, vdo_count)) {
dpm_set_mode_entry_done(port);
return;
}
pd_dpm_request(port, DPM_REQUEST_VDM);
}
static void dpm_attempt_mode_exit(int port)
{
uint32_t vdm = 0;
int vdo_count = 0;
enum tcpm_transmit_type tx_type = TCPC_TX_SOP;
/* TODO(b/156749387): Support Data Reset for exiting USB4. */
if (IS_ENABLED(CONFIG_USB_PD_TBT_COMPAT_MODE) &&
tbt_is_active(port)) {
CPRINTS("C%d: TBT teardown", port);
tbt_exit_mode_request(port);
vdo_count = tbt_setup_next_vdm(port, VDO_MAX_SIZE, &vdm,
&tx_type);
} else if (dp_is_active(port)) {
CPRINTS("C%d: DP teardown", port);
vdo_count = dp_setup_next_vdm(port, VDO_MAX_SIZE, &vdm);
} else {
/* Clear exit mode request */
dpm_clear_mode_exit_request(port);
return;
}
if (!pd_setup_vdm_request(port, tx_type, &vdm, vdo_count)) {
dpm_clear_mode_exit_request(port);
return;
}
pd_dpm_request(port, DPM_REQUEST_VDM);
}
void dpm_run(int port)
{
if (dpm[port].mode_exit_request)
dpm_attempt_mode_exit(port);
else if (!dpm[port].mode_entry_done)
dpm_attempt_mode_entry(port);
}
|
