Release 4.11 drivers/gpu/drm/nouveau/nvkm/engine/disp/outpdp.c
/*
* 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)
{
struct nvkm_output_dp *outp = nvkm_output_dp(base);
bool retrain = true;
u8 link[2], stat[3];
u32 linkrate;
int ret, i;
mutex_lock(&outp->mutex);
/* 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;
}
nvkm_dp_train(outp);
}
mutex_unlock(&outp->mutex);
return ret;
}
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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);
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);
}
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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;
}
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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);
nvkm_event_send(&disp->hpd, rep.mask, conn->index, &rep, sizeof(rep));
return NVKM_NOTIFY_KEEP;
}
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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);
nvkm_output_dp_enable(outp, false);
}
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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->irq);
nvkm_notify_get(&outp->hpd);
}
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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;
}
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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 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;
}
mutex_init(&outp->mutex);
atomic_set(&outp->lt.done, 0);
/* 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;
}
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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);
}
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