/*
* Copyright 2009 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 <drm/display/drm_dp_helper.h>
#include "nouveau_drv.h"
#include "nouveau_connector.h"
#include "nouveau_encoder.h"
#include "nouveau_crtc.h"
#include <nvif/if0011.h>
MODULE_PARM_DESC(mst, "Enable DisplayPort multi-stream (default: enabled)");
static int nouveau_mst = 1;
module_param_named(mst, nouveau_mst, int, 0400);
static bool
nouveau_dp_has_sink_count(struct drm_connector *connector,
struct nouveau_encoder *outp)
{
return drm_dp_read_sink_count_cap(connector, outp->dp.dpcd, &outp->dp.desc);
}
static bool
nouveau_dp_probe_lttpr(struct nouveau_encoder *outp)
{
u8 rev, size = sizeof(rev);
int ret;
ret = nvif_outp_dp_aux_xfer(&outp->outp, DP_AUX_NATIVE_READ, &size,
DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV,
&rev);
if (ret || size < sizeof(rev) || rev < 0x14)
return false;
return true;
}
static enum drm_connector_status
nouveau_dp_probe_dpcd(struct nouveau_connector *nv_connector,
struct nouveau_encoder *outp)
{
struct drm_connector *connector = &nv_connector->base;
struct drm_dp_aux *aux = &nv_connector->aux;
struct nv50_mstm *mstm = NULL;
enum drm_connector_status status = connector_status_disconnected;
int ret;
u8 *dpcd = outp->dp.dpcd;
outp->dp.lttpr.nr = 0;
outp->dp.rate_nr = 0;
outp->dp.link_nr = 0;
outp->dp.link_bw = 0;
if (connector->connector_type != DRM_MODE_CONNECTOR_eDP &&
nouveau_dp_probe_lttpr(outp) &&
!drm_dp_read_dpcd_caps(aux, dpcd) &&
!drm_dp_read_lttpr_common_caps(aux, dpcd, outp->dp.lttpr.caps)) {
int nr = drm_dp_lttpr_count(outp->dp.lttpr.caps);
if (nr) {
drm_dp_dpcd_writeb(aux, DP_PHY_REPEATER_MODE,
DP_PHY_REPEATER_MODE_TRANSPARENT);
if (nr > 0) {
ret = drm_dp_dpcd_writeb(aux, DP_PHY_REPEATER_MODE,
DP_PHY_REPEATER_MODE_NON_TRANSPARENT);
if (ret != 1) {
drm_dp_dpcd_writeb(aux, DP_PHY_REPEATER_MODE,
DP_PHY_REPEATER_MODE_TRANSPARENT);
} else {
outp->dp.lttpr.nr = nr;
}
}
}
}
ret = drm_dp_read_dpcd_caps(aux, dpcd);
if (ret < 0)
goto out;
outp->dp.link_nr = dpcd[DP_MAX_LANE_COUNT] & DP_MAX_LANE_COUNT_MASK;
if (outp->dcb->dpconf.link_nr < outp->dp.link_nr)
outp->dp.link_nr = outp->dcb->dpconf.link_nr;
if (outp->dp.lttpr.nr) {
int links = drm_dp_lttpr_max_lane_count(outp->dp.lttpr.caps);
if (links && links < outp->dp.link_nr)
outp->dp.link_nr = links;
}
if (connector->connector_type == DRM_MODE_CONNECTOR_eDP && dpcd[DP_DPCD_REV] >= 0x13) {
__le16 rates[DP_MAX_SUPPORTED_RATES];
ret = drm_dp_dpcd_read(aux, DP_SUPPORTED_LINK_RATES, rates, sizeof(rates));
if (ret == sizeof(rates)) {
for (int i = 0; i < ARRAY_SIZE(rates); i++) {
u32 rate = (le16_to_cpu(rates[i]) * 200) / 10;
int j;
if (!rate)
break;
for (j = 0; j < outp->dp.rate_nr; j++) {
if (rate > outp->dp.rate[j].rate) {
for (int k = outp->dp.rate_nr; k > j; k--)
outp->dp.rate[k] = outp->dp.rate[k - 1];
break;
}
}
outp->dp.rate[j].dpcd = i;
outp->dp.rate[j].rate = rate;
outp->dp.rate_nr++;
}
}
}
if (!outp->dp.rate_nr) {
const u32 rates[] = { 810000, 540000, 270000, 162000 };
u32 max_rate = dpcd[DP_MAX_LINK_RATE] * 27000;
if (outp->dp.lttpr.nr) {
int rate = drm_dp_lttpr_max_link_rate(outp->dp.lttpr.caps);
if (rate && rate < max_rate)
max_rate = rate;
}
max_rate = min_t(int, max_rate, outp->dcb->dpconf.link_bw);
for (int i = 0; i < ARRAY_SIZE(rates); i++) {
if (rates[i] <= max_rate) {
outp->dp.rate[outp->dp.rate_nr].dpcd = -1;
outp->dp.rate[outp->dp.rate_nr].rate = rates[i];
outp->dp.rate_nr++;
}
}
if (WARN_ON(!outp->dp.rate_nr))
goto out;
}
ret = nvif_outp_dp_rates(&outp->outp, outp->dp.rate, outp->dp.rate_nr);
if (ret)
goto out;
for (int i = 0; i < outp->dp.rate_nr; i++) {
u32 link_bw = outp->dp.rate[i].rate;
if (link_bw > outp->dp.link_bw)
outp->dp.link_bw = link_bw;
}
ret = drm_dp_read_desc(aux, &outp->dp.desc, drm_dp_is_branch(dpcd));
if (ret < 0)
goto out;
if (nouveau_mst) {
mstm = outp->dp.mstm;
if (mstm)
mstm->can_mst = drm_dp_read_mst_cap(aux, dpcd) == DRM_DP_MST;
}
if (nouveau_dp_has_sink_count(connector, outp)) {
ret = drm_dp_read_sink_count(aux);
if (ret < 0)
goto out;
outp->dp.sink_count = ret;
/*
* Dongle connected, but no display. Don't bother reading
* downstream port info
*/
if (!outp->dp.sink_count)
return connector_status_disconnected;
}
ret = drm_dp_read_downstream_info(aux, dpcd,
outp->dp.downstream_ports);
if (ret < 0)
goto out;
status = connector_status_connected;
out:
if (status != connector_status_connected) {
/* Clear any cached info */
outp->dp.sink_count = 0;
}
return status;
}
int
nouveau_dp_detect(struct nouveau_connector *nv_connector,
struct nouveau_encoder *nv_encoder)
{
struct drm_device *dev = nv_encoder->base.base.dev;
struct nouveau_drm *drm = nouveau_drm(dev);
struct drm_connector *connector = &nv_connector->base;
struct nv50_mstm *mstm = nv_encoder->dp.mstm;
enum drm_connector_status status;
u8 *dpcd = nv_encoder->dp.dpcd;
int ret = NOUVEAU_DP_NONE, hpd;
/* eDP ports don't support hotplugging - so there's no point in probing eDP ports unless we
* haven't probed them once before.
*/
if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
if (connector->status == connector_status_connected)
return NOUVEAU_DP_SST;
else if (connector->status == connector_status_disconnected)
return NOUVEAU_DP_NONE;
}
// Ensure that the aux bus is enabled for probing
drm_dp_dpcd_set_powered(&nv_connector->aux, true);
mutex_lock(&nv_encoder->dp.hpd_irq_lock);
if (mstm) {
/* If we're not ready to handle MST state changes yet, just
* report the last status of the connector. We'll reprobe it
* once we've resumed.
*/
if (mstm->suspended) {
if (mstm->is_mst)
ret = NOUVEAU_DP_MST;
else if (connector->status ==
connector_status_connected)
ret = NOUVEAU_DP_SST;
goto out;
}
}
hpd = nvif_outp_detect(&nv_encoder->outp);
if (hpd == NOT_PRESENT) {
nvif_outp_dp_aux_pwr(&nv_encoder->outp, false);
goto out;
}
nvif_outp_dp_aux_pwr(&nv_encoder->outp, true);
status = nouveau_dp_probe_dpcd(nv_connector, nv_encoder);
if (status == connector_status_disconnected) {
nvif_outp_dp_aux_pwr(&nv_encoder->outp, false);
goto out;
}
/* If we're in MST mode, we're done here */
if (mstm && mstm->can_mst && mstm->is_mst) {
ret = NOUVEAU_DP_MST;
goto out;
}
NV_DEBUG(drm, "sink dpcd version: 0x%02x\n", dpcd[DP_DPCD_REV]);
for (int i = 0; i < nv_encoder->dp.rate_nr; i++)
NV_DEBUG(drm, "sink rate %d: %d\n", i, nv_encoder->dp.rate[i].rate);
NV_DEBUG(drm, "encoder: %dx%d\n", nv_encoder->dcb->dpconf.link_nr,
nv_encoder->dcb->dpconf.link_bw);
NV_DEBUG(drm, "maximum: %dx%d\n", nv_encoder->dp.link_nr,
nv_encoder->dp.link_bw);
if (mstm && mstm->can_mst) {
ret = nv50_mstm_detect(nv_encoder);
if (ret == 1) {
ret = NOUVEAU_DP_MST;
goto out;
} else if (ret != 0) {
nvif_outp_dp_aux_pwr(&nv_encoder->outp, false);
goto out;
}
}
ret = NOUVEAU_DP_SST;
out:
if (mstm && !mstm->suspended && ret != NOUVEAU_DP_MST)
nv50_mstm_remove(mstm);
/* GSP doesn't like when we try to do aux transactions on a port it considers disconnected,
* and since we don't really have a usecase for that anyway - just disable the aux bus here
* if we've decided the connector is disconnected
*/
if (ret == NOUVEAU_DP_NONE)
drm_dp_dpcd_set_powered(&nv_connector->aux, false);
mutex_unlock(&nv_encoder->dp.hpd_irq_lock);
return ret;
}
void
nouveau_dp_power_down(struct nouveau_encoder *outp)
{
struct drm_dp_aux *aux = &outp->conn->aux;
int ret;
u8 pwr;
mutex_lock(&outp->dp.hpd_irq_lock);
ret = drm_dp_dpcd_readb(aux, DP_SET_POWER, &pwr);
if (ret == 1) {
pwr &= ~DP_SET_POWER_MASK;
pwr |= DP_SET_POWER_D3;
drm_dp_dpcd_writeb(aux, DP_SET_POWER, pwr);
}
outp->dp.lt.nr = 0;
mutex_unlock(&outp->dp.hpd_irq_lock);
}
static bool
nouveau_dp_train_link(struct nouveau_encoder *outp, bool retrain)
{
struct drm_dp_aux *aux = &outp->conn->aux;
bool post_lt = false;
int ret, retries = 0;
if ( (outp->dp.dpcd[DP_MAX_LANE_COUNT] & 0x20) &&
!(outp->dp.dpcd[DP_MAX_DOWNSPREAD] & DP_TPS4_SUPPORTED))
post_lt = true;
retry:
ret = nvif_outp_dp_train(&outp->outp, outp->dp.dpcd,
outp->dp.lttpr.nr,
outp->dp.lt.nr,
outp->dp.lt.bw,
outp->dp.lt.mst,
post_lt,
retrain);
if (ret)
return false;
if (post_lt) {
u8 stat[DP_LINK_STATUS_SIZE];
u8 prev[2];
u8 time = 0, adjusts = 0, tmp;
ret = drm_dp_dpcd_read_phy_link_status(aux, DP_PHY_DPRX, stat);
if (ret)
return false;
for (;;) {
if (!drm_dp_channel_eq_ok(stat, outp->dp.lt.nr)) {
ret = 1;
break;
}
if (!(stat[2] & 0x02))
break;
msleep(5);
time += 5;
memcpy(prev, &stat[4], sizeof(prev));
ret = drm_dp_dpcd_read_phy_link_status(aux, DP_PHY_DPRX, stat);
if (ret)
break;
if (!memcmp(prev, &stat[4], sizeof(prev))) {
if (time > 200)
break;
} else {
u8 pe[4], vs[4];
if (adjusts++ == 6)
break;
for (int i = 0; i < outp->dp.lt.nr; i++) {
pe[i] = drm_dp_get_adjust_request_pre_emphasis(stat, i) >>
DP_TRAIN_PRE_EMPHASIS_SHIFT;
vs[i] = drm_dp_get_adjust_request_voltage(stat, i) >>
DP_TRAIN_VOLTAGE_SWING_SHIFT;
}
ret = nvif_outp_dp_drive(&outp->outp, outp->dp.lt.nr, pe, vs);
if (ret)
break;
time = 0;
}
}
if (drm_dp_dpcd_readb(aux, DP_LANE_COUNT_SET, &tmp) == 1) {
tmp &= ~0x20;
drm_dp_dpcd_writeb(aux, DP_LANE_COUNT_SET, tmp);
}
}
if (ret == 1 && retries++ < 3)
goto retry;
return ret == 0;
}
bool
nouveau_dp_train(struct nouveau_encoder *outp, bool mst, u32 khz, u8 bpc)
{
struct nouveau_drm *drm = nouveau_drm(outp->base.base.dev);
struct drm_dp_aux *aux = &outp->conn->aux;
u32 min_rate;
u8 pwr;
bool ret = true;
if (mst)
min_rate = outp->dp.link_nr * outp->dp.rate[0].rate;
else
min_rate = DIV_ROUND_UP(khz * bpc * 3, 8);
NV_DEBUG(drm, "%s link training (mst:%d min_rate:%d)\n",
outp->base.base.name, mst, min_rate);
mutex_lock(&outp->dp.hpd_irq_lock);
if (drm_dp_dpcd_readb(aux, DP_SET_POWER, &pwr) == 1) {
if ((pwr & DP_SET_POWER_MASK) != DP_SET_POWER_D0) {
pwr &= ~DP_SET_POWER_MASK;
pwr |= DP_SET_POWER_D0;
drm_dp_dpcd_writeb(aux, DP_SET_POWER, pwr);
}
}
for (int nr = outp->dp.link_nr; nr; nr >>= 1) {
for (int rate = 0; rate < outp->dp.rate_nr; rate++) {
if (outp->dp.rate[rate].rate * nr >= min_rate) {
outp->dp.lt.nr = nr;
outp->dp.lt.bw = outp->dp.rate[rate].rate;
outp->dp.lt.mst = mst;
if (nouveau_dp_train_link(outp, false))
goto done;
}
}
}
ret = false;
done:
mutex_unlock(&outp->dp.hpd_irq_lock);
return ret;
}
static bool
nouveau_dp_link_check_locked(struct nouveau_encoder *outp)
{
u8 link_status[DP_LINK_STATUS_SIZE];
if (!outp || !outp->dp.lt.nr)
return true;
if (drm_dp_dpcd_read_phy_link_status(&outp->conn->aux, DP_PHY_DPRX, link_status) < 0)
return false;
if (drm_dp_channel_eq_ok(link_status, outp->dp.lt.nr))
return true;
return nouveau_dp_train_link(outp, true);
}
bool
nouveau_dp_link_check(struct nouveau_connector *nv_connector)
{
struct nouveau_encoder *outp = nv_connector->dp_encoder;
bool link_ok = true;
if (outp) {
mutex_lock(&outp->dp.hpd_irq_lock);
if (outp->dp.lt.nr)
link_ok = nouveau_dp_link_check_locked(outp);
mutex_unlock(&outp->dp.hpd_irq_lock);
}
return link_ok;
}
void
nouveau_dp_irq(struct work_struct *work)
{
struct nouveau_connector *nv_connector =
container_of(work, typeof(*nv_connector), irq_work);
struct drm_connector *connector = &nv_connector->base;
struct nouveau_encoder *outp = find_encoder(connector, DCB_OUTPUT_DP);
struct nouveau_drm *drm = nouveau_drm(outp->base.base.dev);
struct nv50_mstm *mstm;
u64 hpd = 0;
int ret;
if (!outp)
return;
mstm = outp->dp.mstm;
NV_DEBUG(drm, "service %s\n", connector->name);
mutex_lock(&outp->dp.hpd_irq_lock);
if (mstm && mstm->is_mst) {
if (!nv50_mstm_service(drm, nv_connector, mstm))
hpd |= NVIF_CONN_EVENT_V0_UNPLUG;
} else {
drm_dp_cec_irq(&nv_connector->aux);
if (nouveau_dp_has_sink_count(connector, outp)) {
ret = drm_dp_read_sink_count(&nv_connector->aux);
if (ret != outp->dp.sink_count)
hpd |= NVIF_CONN_EVENT_V0_PLUG;
if (ret >= 0)
outp->dp.sink_count = ret;
}
}
mutex_unlock(&outp->dp.hpd_irq_lock);
nouveau_connector_hpd(nv_connector, NVIF_CONN_EVENT_V0_IRQ | hpd);
}
/* TODO:
* - Validate against the DP caps advertised by the GPU (we don't check these
* yet)
*/
enum drm_mode_status
nv50_dp_mode_valid(struct nouveau_encoder *outp,
const struct drm_display_mode *mode,
unsigned *out_clock)
{
const unsigned int min_clock = 25000;
unsigned int max_rate, mode_rate, ds_max_dotclock, clock = mode->clock;
/* Check with the minmum bpc always, so we can advertise better modes.
* In particlar not doing this causes modes to be dropped on HDR
* displays as we might check with a bpc of 16 even.
*/
const u8 bpp = 6 * 3;
if (mode->flags & DRM_MODE_FLAG_INTERLACE && !outp->caps.dp_interlace)
return MODE_NO_INTERLACE;
if ((mode->flags & DRM_MODE_FLAG_3D_MASK) == DRM_MODE_FLAG_3D_FRAME_PACKING)
clock *= 2;
max_rate = outp->dp.link_nr * outp->dp.link_bw;
mode_rate = DIV_ROUND_UP(clock * bpp, 8);
if (mode_rate > max_rate)
return MODE_CLOCK_HIGH;
ds_max_dotclock = drm_dp_downstream_max_dotclock(outp->dp.dpcd, outp->dp.downstream_ports);
if (ds_max_dotclock && clock > ds_max_dotclock)
return MODE_CLOCK_HIGH;
if (clock < min_clock)
return MODE_CLOCK_LOW;
if (out_clock)
*out_clock = clock;
return MODE_OK;
}
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