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* 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 = (void *)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 = nv_rdaux(outp->base.edid, DPCD_LC00_LINK_BW_SET, link, 2);
if (ret) {
DBG("failed to read link config, assuming no sink\n");
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) {
DBG("link not trained at sufficient rate\n");
goto done;
}
/* check that link is still trained */
ret = nv_rdaux(outp->base.edid, DPCD_LS02, stat, 3);
if (ret) {
DBG("failed to read link status, assuming no sink\n");
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)) {
DBG("lane %d not equalised\n", lane);
goto done;
}
}
retrain = false;
} else {
DBG("no inter-lane alignment\n");
}
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 present)
{
struct nvkm_i2c_port *port = outp->base.edid;
if (present) {
if (!outp->present) {
nvkm_i2c(port)->acquire_pad(port, 0);
DBG("aux power -> always\n");
outp->present = true;
}
nvkm_output_dp_train(&outp->base, 0, true);
} else {
if (outp->present) {
nvkm_i2c(port)->release_pad(port);
DBG("aux power -> demand\n");
outp->present = false;
}
atomic_set(&outp->lt.done, 0);
}
}
static void
nvkm_output_dp_detect(struct nvkm_output_dp *outp)
{
struct nvkm_i2c_port *port = outp->base.edid;
int ret = nvkm_i2c(port)->acquire_pad(port, 0);
if (ret == 0) {
ret = nv_rdaux(outp->base.edid, DPCD_RC00_DPCD_REV,
outp->dpcd, sizeof(outp->dpcd));
nvkm_output_dp_enable(outp, ret == 0);
nvkm_i2c(port)->release_pad(port);
}
}
static int
nvkm_output_dp_hpd(struct nvkm_notify *notify)
{
struct nvkm_connector *conn = container_of(notify, typeof(*conn), hpd);
struct nvkm_output_dp *outp;
struct nvkm_disp *disp = nvkm_disp(conn);
const struct nvkm_i2c_ntfy_rep *line = notify->data;
struct nvif_notify_conn_rep_v0 rep = {};
list_for_each_entry(outp, &disp->outp, base.head) {
if (outp->base.conn == conn &&
outp->info.type == DCB_OUTPUT_DP) {
DBG("HPD: %d\n", line->mask);
nvkm_output_dp_detect(outp);
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;
}
}
WARN_ON(1);
return NVKM_NOTIFY_DROP;
}
static int
nvkm_output_dp_irq(struct nvkm_notify *notify)
{
struct nvkm_output_dp *outp = container_of(notify, typeof(*outp), irq);
struct nvkm_disp *disp = nvkm_disp(outp);
const struct nvkm_i2c_ntfy_rep *line = notify->data;
struct nvif_notify_conn_rep_v0 rep = {
.mask = NVIF_NOTIFY_CONN_V0_IRQ,
};
int index = outp->base.info.connector;
DBG("IRQ: %d\n", line->mask);
nvkm_output_dp_train(&outp->base, 0, true);
nvkm_event_send(&disp->hpd, rep.mask, index, &rep, sizeof(rep));
return NVKM_NOTIFY_DROP;
}
int
_nvkm_output_dp_fini(struct nvkm_object *object, bool suspend)
{
struct nvkm_output_dp *outp = (void *)object;
nvkm_notify_put(&outp->irq);
nvkm_output_dp_enable(outp, false);
return nvkm_output_fini(&outp->base, suspend);
}
int
_nvkm_output_dp_init(struct nvkm_object *object)
{
struct nvkm_output_dp *outp = (void *)object;
nvkm_output_dp_detect(outp);
return nvkm_output_init(&outp->base);
}
void
_nvkm_output_dp_dtor(struct nvkm_object *object)
{
struct nvkm_output_dp *outp = (void *)object;
nvkm_notify_fini(&outp->irq);
nvkm_output_destroy(&outp->base);
}
int
nvkm_output_dp_create_(struct nvkm_object *parent,
struct nvkm_object *engine,
struct nvkm_oclass *oclass,
struct dcb_output *info, int index,
int length, void **pobject)
{
struct nvkm_bios *bios = nvkm_bios(parent);
struct nvkm_i2c *i2c = nvkm_i2c(parent);
struct nvkm_output_dp *outp;
u8 hdr, cnt, len;
u32 data;
int ret;
ret = nvkm_output_create_(parent, engine, oclass, info, index,
length, pobject);
outp = *pobject;
if (ret)
return ret;
nvkm_notify_fini(&outp->base.conn->hpd);
/* access to the aux channel is not optional... */
if (!outp->base.edid) {
ERR("aux channel not found\n");
return -ENODEV;
}
/* nor is the bios data for this output... */
data = nvbios_dpout_match(bios, outp->base.info.hasht,
outp->base.info.hashm, &outp->version,
&hdr, &cnt, &len, &outp->info);
if (!data) {
ERR("no bios dp data\n");
return -ENODEV;
}
DBG("bios dp %02x %02x %02x %02x\n", 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->base.edid->index,
},
sizeof(struct nvkm_i2c_ntfy_req),
sizeof(struct nvkm_i2c_ntfy_rep),
&outp->irq);
if (ret) {
ERR("error monitoring aux irq event: %d\n", 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->base.edid->index,
},
sizeof(struct nvkm_i2c_ntfy_req),
sizeof(struct nvkm_i2c_ntfy_rep),
&outp->base.conn->hpd);
if (ret) {
ERR("error monitoring aux hpd events: %d\n", ret);
return ret;
}
return 0;
}
int
_nvkm_output_dp_ctor(struct nvkm_object *parent,
struct nvkm_object *engine,
struct nvkm_oclass *oclass, void *info, u32 index,
struct nvkm_object **pobject)
{
struct nvkm_output_dp *outp;
int ret;
ret = nvkm_output_dp_create(parent, engine, oclass, info, index, &outp);
*pobject = nv_object(outp);
if (ret)
return ret;
return 0;
}
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