Loading...
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 | // SPDX-License-Identifier: GPL-2.0
/*
* UCSI DisplayPort Alternate Mode Support
*
* Copyright (C) 2018, Intel Corporation
* Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
*/
#include <linux/usb/typec_dp.h>
#include <linux/usb/pd_vdo.h>
#include "ucsi.h"
#define UCSI_CMD_SET_NEW_CAM(_con_num_, _enter_, _cam_, _am_) \
(UCSI_SET_NEW_CAM | ((_con_num_) << 16) | ((_enter_) << 23) | \
((_cam_) << 24) | ((u64)(_am_) << 32))
struct ucsi_dp {
struct typec_displayport_data data;
struct ucsi_connector *con;
struct typec_altmode *alt;
struct work_struct work;
int offset;
bool override;
bool initialized;
u32 header;
u32 *vdo_data;
u8 vdo_size;
};
/*
* Note. Alternate mode control is optional feature in UCSI. It means that even
* if the system supports alternate modes, the OS may not be aware of them.
*
* In most cases however, the OS will be able to see the supported alternate
* modes, but it may still not be able to configure them, not even enter or exit
* them. That is because UCSI defines alt mode details and alt mode "overriding"
* as separate options.
*
* In case alt mode details are supported, but overriding is not, the driver
* will still display the supported pin assignments and configuration, but any
* changes the user attempts to do will lead into failure with return value of
* -EOPNOTSUPP.
*/
static int ucsi_displayport_enter(struct typec_altmode *alt)
{
struct ucsi_dp *dp = typec_altmode_get_drvdata(alt);
struct ucsi_control ctrl;
u8 cur = 0;
int ret;
mutex_lock(&dp->con->lock);
if (!dp->override && dp->initialized) {
const struct typec_altmode *p = typec_altmode_get_partner(alt);
dev_warn(&p->dev,
"firmware doesn't support alternate mode overriding\n");
mutex_unlock(&dp->con->lock);
return -EOPNOTSUPP;
}
UCSI_CMD_GET_CURRENT_CAM(ctrl, dp->con->num);
ret = ucsi_send_command(dp->con->ucsi, &ctrl, &cur, sizeof(cur));
if (ret < 0) {
if (dp->con->ucsi->ppm->data->version > 0x0100) {
mutex_unlock(&dp->con->lock);
return ret;
}
cur = 0xff;
}
if (cur != 0xff) {
mutex_unlock(&dp->con->lock);
if (dp->con->port_altmode[cur] == alt)
return 0;
return -EBUSY;
}
/*
* We can't send the New CAM command yet to the PPM as it needs the
* configuration value as well. Pretending that we have now entered the
* mode, and letting the alt mode driver continue.
*/
dp->header = VDO(USB_TYPEC_DP_SID, 1, CMD_ENTER_MODE);
dp->header |= VDO_OPOS(USB_TYPEC_DP_MODE);
dp->header |= VDO_CMDT(CMDT_RSP_ACK);
dp->vdo_data = NULL;
dp->vdo_size = 1;
schedule_work(&dp->work);
mutex_unlock(&dp->con->lock);
return 0;
}
static int ucsi_displayport_exit(struct typec_altmode *alt)
{
struct ucsi_dp *dp = typec_altmode_get_drvdata(alt);
struct ucsi_control ctrl;
int ret = 0;
mutex_lock(&dp->con->lock);
if (!dp->override) {
const struct typec_altmode *p = typec_altmode_get_partner(alt);
dev_warn(&p->dev,
"firmware doesn't support alternate mode overriding\n");
ret = -EOPNOTSUPP;
goto out_unlock;
}
ctrl.raw_cmd = UCSI_CMD_SET_NEW_CAM(dp->con->num, 0, dp->offset, 0);
ret = ucsi_send_command(dp->con->ucsi, &ctrl, NULL, 0);
if (ret < 0)
goto out_unlock;
dp->header = VDO(USB_TYPEC_DP_SID, 1, CMD_EXIT_MODE);
dp->header |= VDO_OPOS(USB_TYPEC_DP_MODE);
dp->header |= VDO_CMDT(CMDT_RSP_ACK);
dp->vdo_data = NULL;
dp->vdo_size = 1;
schedule_work(&dp->work);
out_unlock:
mutex_unlock(&dp->con->lock);
return ret;
}
/*
* We do not actually have access to the Status Update VDO, so we have to guess
* things.
*/
static int ucsi_displayport_status_update(struct ucsi_dp *dp)
{
u32 cap = dp->alt->vdo;
dp->data.status = DP_STATUS_ENABLED;
/*
* If pin assignement D is supported, claiming always
* that Multi-function is preferred.
*/
if (DP_CAP_CAPABILITY(cap) & DP_CAP_UFP_D) {
dp->data.status |= DP_STATUS_CON_UFP_D;
if (DP_CAP_UFP_D_PIN_ASSIGN(cap) & BIT(DP_PIN_ASSIGN_D))
dp->data.status |= DP_STATUS_PREFER_MULTI_FUNC;
} else {
dp->data.status |= DP_STATUS_CON_DFP_D;
if (DP_CAP_DFP_D_PIN_ASSIGN(cap) & BIT(DP_PIN_ASSIGN_D))
dp->data.status |= DP_STATUS_PREFER_MULTI_FUNC;
}
dp->vdo_data = &dp->data.status;
dp->vdo_size = 2;
return 0;
}
static int ucsi_displayport_configure(struct ucsi_dp *dp)
{
u32 pins = DP_CONF_GET_PIN_ASSIGN(dp->data.conf);
struct ucsi_control ctrl;
if (!dp->override)
return 0;
ctrl.raw_cmd = UCSI_CMD_SET_NEW_CAM(dp->con->num, 1, dp->offset, pins);
return ucsi_send_command(dp->con->ucsi, &ctrl, NULL, 0);
}
static int ucsi_displayport_vdm(struct typec_altmode *alt,
u32 header, const u32 *data, int count)
{
struct ucsi_dp *dp = typec_altmode_get_drvdata(alt);
int cmd_type = PD_VDO_CMDT(header);
int cmd = PD_VDO_CMD(header);
mutex_lock(&dp->con->lock);
if (!dp->override && dp->initialized) {
const struct typec_altmode *p = typec_altmode_get_partner(alt);
dev_warn(&p->dev,
"firmware doesn't support alternate mode overriding\n");
mutex_unlock(&dp->con->lock);
return -EOPNOTSUPP;
}
switch (cmd_type) {
case CMDT_INIT:
dp->header = VDO(USB_TYPEC_DP_SID, 1, cmd);
dp->header |= VDO_OPOS(USB_TYPEC_DP_MODE);
switch (cmd) {
case DP_CMD_STATUS_UPDATE:
if (ucsi_displayport_status_update(dp))
dp->header |= VDO_CMDT(CMDT_RSP_NAK);
else
dp->header |= VDO_CMDT(CMDT_RSP_ACK);
break;
case DP_CMD_CONFIGURE:
dp->data.conf = *data;
if (ucsi_displayport_configure(dp)) {
dp->header |= VDO_CMDT(CMDT_RSP_NAK);
} else {
dp->header |= VDO_CMDT(CMDT_RSP_ACK);
if (dp->initialized)
ucsi_altmode_update_active(dp->con);
else
dp->initialized = true;
}
break;
default:
dp->header |= VDO_CMDT(CMDT_RSP_ACK);
break;
}
schedule_work(&dp->work);
break;
default:
break;
}
mutex_unlock(&dp->con->lock);
return 0;
}
static const struct typec_altmode_ops ucsi_displayport_ops = {
.enter = ucsi_displayport_enter,
.exit = ucsi_displayport_exit,
.vdm = ucsi_displayport_vdm,
};
static void ucsi_displayport_work(struct work_struct *work)
{
struct ucsi_dp *dp = container_of(work, struct ucsi_dp, work);
int ret;
mutex_lock(&dp->con->lock);
ret = typec_altmode_vdm(dp->alt, dp->header,
dp->vdo_data, dp->vdo_size);
if (ret)
dev_err(&dp->alt->dev, "VDM 0x%x failed\n", dp->header);
dp->vdo_data = NULL;
dp->vdo_size = 0;
dp->header = 0;
mutex_unlock(&dp->con->lock);
}
void ucsi_displayport_remove_partner(struct typec_altmode *alt)
{
struct ucsi_dp *dp;
if (!alt)
return;
dp = typec_altmode_get_drvdata(alt);
if (!dp)
return;
dp->data.conf = 0;
dp->data.status = 0;
dp->initialized = false;
}
struct typec_altmode *ucsi_register_displayport(struct ucsi_connector *con,
bool override, int offset,
struct typec_altmode_desc *desc)
{
u8 all_assignments = BIT(DP_PIN_ASSIGN_C) | BIT(DP_PIN_ASSIGN_D) |
BIT(DP_PIN_ASSIGN_E);
struct typec_altmode *alt;
struct ucsi_dp *dp;
mutex_lock(&con->lock);
/* We can't rely on the firmware with the capabilities. */
desc->vdo |= DP_CAP_DP_SIGNALING | DP_CAP_RECEPTACLE;
/* Claiming that we support all pin assignments */
desc->vdo |= all_assignments << 8;
desc->vdo |= all_assignments << 16;
alt = typec_port_register_altmode(con->port, desc);
if (IS_ERR(alt)) {
mutex_unlock(&con->lock);
return alt;
}
dp = devm_kzalloc(&alt->dev, sizeof(*dp), GFP_KERNEL);
if (!dp) {
typec_unregister_altmode(alt);
mutex_unlock(&con->lock);
return ERR_PTR(-ENOMEM);
}
INIT_WORK(&dp->work, ucsi_displayport_work);
dp->override = override;
dp->offset = offset;
dp->con = con;
dp->alt = alt;
alt->ops = &ucsi_displayport_ops;
typec_altmode_set_drvdata(alt, dp);
mutex_unlock(&con->lock);
return alt;
}
|