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path: root/drivers/gpu/drm/nouveau/nouveau_dp.c
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Diffstat (limited to 'drivers/gpu/drm/nouveau/nouveau_dp.c')
-rw-r--r--drivers/gpu/drm/nouveau/nouveau_dp.c546
1 files changed, 503 insertions, 43 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_dp.c b/drivers/gpu/drm/nouveau/nouveau_dp.c
index 0d052e1660f8..55691ec44aba 100644
--- a/drivers/gpu/drm/nouveau/nouveau_dp.c
+++ b/drivers/gpu/drm/nouveau/nouveau_dp.c
@@ -22,80 +22,540 @@
* Authors: Ben Skeggs
*/
-#include <drm/drmP.h>
-#include <drm/drm_dp_helper.h>
+#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/class.h>
-#include <nvif/cl5070.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 void
-nouveau_dp_probe_oui(struct drm_device *dev, struct nvkm_i2c_aux *aux, u8 *dpcd)
+static bool
+nouveau_dp_has_sink_count(struct drm_connector *connector,
+ struct nouveau_encoder *outp)
{
- struct nouveau_drm *drm = nouveau_drm(dev);
- u8 buf[3];
+ return drm_dp_read_sink_count_cap(connector, outp->dp.dpcd, &outp->dp.desc);
+}
- if (!(dpcd[DP_DOWN_STREAM_PORT_COUNT] & DP_OUI_SUPPORT))
- return;
+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 (!drm_dp_lttpr_init(aux, nr))
+ 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 (!nvkm_rdaux(aux, DP_SINK_OUI, buf, 3))
- NV_DEBUG(drm, "Sink OUI: %02hx%02hx%02hx\n",
- buf[0], buf[1], buf[2]);
+ if (WARN_ON(!outp->dp.rate_nr))
+ goto out;
+ }
- if (!nvkm_rdaux(aux, DP_BRANCH_OUI, buf, 3))
- NV_DEBUG(drm, "Branch OUI: %02hx%02hx%02hx\n",
- buf[0], buf[1], buf[2]);
+ 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_encoder *nv_encoder)
+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 nvkm_i2c_aux *aux;
- u8 dpcd[8];
+ 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);
+ }
- aux = nv_encoder->aux;
- if (!aux)
- return -ENODEV;
+ 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;
- ret = nvkm_rdaux(aux, DP_DPCD_REV, dpcd, sizeof(dpcd));
+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 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;
- nv_encoder->dp.link_bw = 27000 * dpcd[1];
- nv_encoder->dp.link_nr = dpcd[2] & DP_MAX_LANE_COUNT_MASK;
+ time = 0;
+ }
+ }
- NV_DEBUG(drm, "display: %dx%d dpcd 0x%02x\n",
- nv_encoder->dp.link_nr, nv_encoder->dp.link_bw, dpcd[0]);
- NV_DEBUG(drm, "encoder: %dx%d\n",
- nv_encoder->dcb->dpconf.link_nr,
- nv_encoder->dcb->dpconf.link_bw);
+ 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 (nv_encoder->dcb->dpconf.link_nr < nv_encoder->dp.link_nr)
- nv_encoder->dp.link_nr = nv_encoder->dcb->dpconf.link_nr;
- if (nv_encoder->dcb->dpconf.link_bw < nv_encoder->dp.link_bw)
- nv_encoder->dp.link_bw = nv_encoder->dcb->dpconf.link_bw;
+ if (ret == 1 && retries++ < 3)
+ goto retry;
- NV_DEBUG(drm, "maximum: %dx%d\n",
- nv_encoder->dp.link_nr, nv_encoder->dp.link_bw);
+ 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);
+ }
+ }
- nouveau_dp_probe_oui(dev, aux, dpcd);
+ 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 = nv50_mstm_detect(nv_encoder->dp.mstm, dpcd, nouveau_mst);
- if (ret == 1)
- return NOUVEAU_DP_MST;
- if (ret == 0)
- return NOUVEAU_DP_SST;
+ 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;
+}
generated by cgit (git 2.34.1) at 2025-12-26 03:50:41 +0000