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 | /*
* Copyright 2014 Red Hat Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Authors: Ben Skeggs
*/
#include "outpdp.h"
#include "conn.h"
#include "dport.h"
#include "priv.h"
#include <subdev/i2c.h>
#include <nvif/event.h>
int
nvkm_output_dp_train(struct nvkm_output *base, u32 datarate, bool wait)
{
struct nvkm_output_dp *outp = nvkm_output_dp(base);
bool retrain = true;
u8 link[2], stat[3];
u32 linkrate;
int ret, i;
/* check that the link is trained at a high enough rate */
ret = nvkm_rdaux(outp->aux, DPCD_LC00_LINK_BW_SET, link, 2);
if (ret) {
OUTP_DBG(&outp->base,
"failed to read link config, assuming no sink");
goto done;
}
linkrate = link[0] * 27000 * (link[1] & DPCD_LC01_LANE_COUNT_SET);
linkrate = (linkrate * 8) / 10; /* 8B/10B coding overhead */
datarate = (datarate + 9) / 10; /* -> decakilobits */
if (linkrate < datarate) {
OUTP_DBG(&outp->base, "link not trained at sufficient rate");
goto done;
}
/* check that link is still trained */
ret = nvkm_rdaux(outp->aux, DPCD_LS02, stat, 3);
if (ret) {
OUTP_DBG(&outp->base,
"failed to read link status, assuming no sink");
goto done;
}
if (stat[2] & DPCD_LS04_INTERLANE_ALIGN_DONE) {
for (i = 0; i < (link[1] & DPCD_LC01_LANE_COUNT_SET); i++) {
u8 lane = (stat[i >> 1] >> ((i & 1) * 4)) & 0x0f;
if (!(lane & DPCD_LS02_LANE0_CR_DONE) ||
!(lane & DPCD_LS02_LANE0_CHANNEL_EQ_DONE) ||
!(lane & DPCD_LS02_LANE0_SYMBOL_LOCKED)) {
OUTP_DBG(&outp->base,
"lane %d not equalised", lane);
goto done;
}
}
retrain = false;
} else {
OUTP_DBG(&outp->base, "no inter-lane alignment");
}
done:
if (retrain || !atomic_read(&outp->lt.done)) {
/* no sink, but still need to configure source */
if (outp->dpcd[DPCD_RC00_DPCD_REV] == 0x00) {
outp->dpcd[DPCD_RC01_MAX_LINK_RATE] =
outp->base.info.dpconf.link_bw;
outp->dpcd[DPCD_RC02] =
outp->base.info.dpconf.link_nr;
}
atomic_set(&outp->lt.done, 0);
schedule_work(&outp->lt.work);
} else {
nvkm_notify_get(&outp->irq);
}
if (wait) {
if (!wait_event_timeout(outp->lt.wait,
atomic_read(&outp->lt.done),
msecs_to_jiffies(2000)))
ret = -ETIMEDOUT;
}
return ret;
}
static void
nvkm_output_dp_enable(struct nvkm_output_dp *outp, bool enable)
{
struct nvkm_i2c_aux *aux = outp->aux;
if (enable) {
if (!outp->present) {
OUTP_DBG(&outp->base, "aux power -> always");
nvkm_i2c_aux_monitor(aux, true);
outp->present = true;
}
if (!nvkm_rdaux(aux, DPCD_RC00_DPCD_REV, outp->dpcd,
sizeof(outp->dpcd))) {
nvkm_output_dp_train(&outp->base, 0, true);
return;
}
}
if (outp->present) {
OUTP_DBG(&outp->base, "aux power -> demand");
nvkm_i2c_aux_monitor(aux, false);
outp->present = false;
}
atomic_set(&outp->lt.done, 0);
}
static int
nvkm_output_dp_hpd(struct nvkm_notify *notify)
{
const struct nvkm_i2c_ntfy_rep *line = notify->data;
struct nvkm_output_dp *outp = container_of(notify, typeof(*outp), hpd);
struct nvkm_connector *conn = outp->base.conn;
struct nvkm_disp *disp = outp->base.disp;
struct nvif_notify_conn_rep_v0 rep = {};
OUTP_DBG(&outp->base, "HPD: %d", line->mask);
nvkm_output_dp_enable(outp, true);
if (line->mask & NVKM_I2C_UNPLUG)
rep.mask |= NVIF_NOTIFY_CONN_V0_UNPLUG;
if (line->mask & NVKM_I2C_PLUG)
rep.mask |= NVIF_NOTIFY_CONN_V0_PLUG;
nvkm_event_send(&disp->hpd, rep.mask, conn->index, &rep, sizeof(rep));
return NVKM_NOTIFY_KEEP;
}
static int
nvkm_output_dp_irq(struct nvkm_notify *notify)
{
const struct nvkm_i2c_ntfy_rep *line = notify->data;
struct nvkm_output_dp *outp = container_of(notify, typeof(*outp), irq);
struct nvkm_connector *conn = outp->base.conn;
struct nvkm_disp *disp = outp->base.disp;
struct nvif_notify_conn_rep_v0 rep = {
.mask = NVIF_NOTIFY_CONN_V0_IRQ,
};
OUTP_DBG(&outp->base, "IRQ: %d", line->mask);
nvkm_output_dp_train(&outp->base, 0, true);
nvkm_event_send(&disp->hpd, rep.mask, conn->index, &rep, sizeof(rep));
return NVKM_NOTIFY_DROP;
}
static void
nvkm_output_dp_fini(struct nvkm_output *base)
{
struct nvkm_output_dp *outp = nvkm_output_dp(base);
nvkm_notify_put(&outp->hpd);
nvkm_notify_put(&outp->irq);
flush_work(&outp->lt.work);
nvkm_output_dp_enable(outp, false);
}
static void
nvkm_output_dp_init(struct nvkm_output *base)
{
struct nvkm_output_dp *outp = nvkm_output_dp(base);
nvkm_notify_put(&outp->base.conn->hpd);
nvkm_output_dp_enable(outp, true);
nvkm_notify_get(&outp->hpd);
}
static void *
nvkm_output_dp_dtor(struct nvkm_output *base)
{
struct nvkm_output_dp *outp = nvkm_output_dp(base);
nvkm_notify_fini(&outp->hpd);
nvkm_notify_fini(&outp->irq);
return outp;
}
static const struct nvkm_output_func
nvkm_output_dp_func = {
.dtor = nvkm_output_dp_dtor,
.init = nvkm_output_dp_init,
.fini = nvkm_output_dp_fini,
};
int
nvkm_output_dp_ctor(const struct nvkm_output_dp_func *func,
struct nvkm_disp *disp, int index, struct dcb_output *dcbE,
struct nvkm_i2c_aux *aux, struct nvkm_output_dp *outp)
{
struct nvkm_device *device = disp->engine.subdev.device;
struct nvkm_bios *bios = device->bios;
struct nvkm_i2c *i2c = device->i2c;
u8 hdr, cnt, len;
u32 data;
int ret;
nvkm_output_ctor(&nvkm_output_dp_func, disp, index, dcbE, &outp->base);
outp->func = func;
outp->aux = aux;
if (!outp->aux) {
OUTP_ERR(&outp->base, "no aux");
return -ENODEV;
}
/* bios data is not optional */
data = nvbios_dpout_match(bios, outp->base.info.hasht,
outp->base.info.hashm, &outp->version,
&hdr, &cnt, &len, &outp->info);
if (!data) {
OUTP_ERR(&outp->base, "no bios dp data");
return -ENODEV;
}
OUTP_DBG(&outp->base, "bios dp %02x %02x %02x %02x",
outp->version, hdr, cnt, len);
/* link training */
INIT_WORK(&outp->lt.work, nvkm_dp_train);
init_waitqueue_head(&outp->lt.wait);
atomic_set(&outp->lt.done, 0);
/* link maintenance */
ret = nvkm_notify_init(NULL, &i2c->event, nvkm_output_dp_irq, true,
&(struct nvkm_i2c_ntfy_req) {
.mask = NVKM_I2C_IRQ,
.port = outp->aux->id,
},
sizeof(struct nvkm_i2c_ntfy_req),
sizeof(struct nvkm_i2c_ntfy_rep),
&outp->irq);
if (ret) {
OUTP_ERR(&outp->base, "error monitoring aux irq: %d", ret);
return ret;
}
/* hotplug detect, replaces gpio-based mechanism with aux events */
ret = nvkm_notify_init(NULL, &i2c->event, nvkm_output_dp_hpd, true,
&(struct nvkm_i2c_ntfy_req) {
.mask = NVKM_I2C_PLUG | NVKM_I2C_UNPLUG,
.port = outp->aux->id,
},
sizeof(struct nvkm_i2c_ntfy_req),
sizeof(struct nvkm_i2c_ntfy_rep),
&outp->hpd);
if (ret) {
OUTP_ERR(&outp->base, "error monitoring aux hpd: %d", ret);
return ret;
}
return 0;
}
int
nvkm_output_dp_new_(const struct nvkm_output_dp_func *func,
struct nvkm_disp *disp, int index, struct dcb_output *dcbE,
struct nvkm_output **poutp)
{
struct nvkm_i2c *i2c = disp->engine.subdev.device->i2c;
struct nvkm_i2c_aux *aux = nvkm_i2c_aux_find(i2c, dcbE->i2c_index);
struct nvkm_output_dp *outp;
if (!(outp = kzalloc(sizeof(*outp), GFP_KERNEL)))
return -ENOMEM;
*poutp = &outp->base;
return nvkm_output_dp_ctor(func, disp, index, dcbE, aux, outp);
}
|