1 /* 2 * Copyright 2009 Red Hat Inc. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice shall be included in 12 * all copies or substantial portions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 20 * OTHER DEALINGS IN THE SOFTWARE. 21 * 22 * Authors: Ben Skeggs 23 */ 24 25 #include <drm/display/drm_dp_helper.h> 26 27 #include "nouveau_drv.h" 28 #include "nouveau_connector.h" 29 #include "nouveau_encoder.h" 30 #include "nouveau_crtc.h" 31 32 #include <nvif/if0011.h> 33 34 MODULE_PARM_DESC(mst, "Enable DisplayPort multi-stream (default: enabled)"); 35 static int nouveau_mst = 1; 36 module_param_named(mst, nouveau_mst, int, 0400); 37 38 static bool 39 nouveau_dp_has_sink_count(struct drm_connector *connector, 40 struct nouveau_encoder *outp) 41 { 42 return drm_dp_read_sink_count_cap(connector, outp->dp.dpcd, &outp->dp.desc); 43 } 44 45 static enum drm_connector_status 46 nouveau_dp_probe_dpcd(struct nouveau_connector *nv_connector, 47 struct nouveau_encoder *outp) 48 { 49 struct drm_connector *connector = &nv_connector->base; 50 struct drm_dp_aux *aux = &nv_connector->aux; 51 struct nv50_mstm *mstm = NULL; 52 enum drm_connector_status status = connector_status_disconnected; 53 int ret; 54 u8 *dpcd = outp->dp.dpcd; 55 56 ret = drm_dp_read_dpcd_caps(aux, dpcd); 57 if (ret < 0) 58 goto out; 59 60 ret = drm_dp_read_desc(aux, &outp->dp.desc, drm_dp_is_branch(dpcd)); 61 if (ret < 0) 62 goto out; 63 64 if (nouveau_mst) { 65 mstm = outp->dp.mstm; 66 if (mstm) 67 mstm->can_mst = drm_dp_read_mst_cap(aux, dpcd); 68 } 69 70 if (nouveau_dp_has_sink_count(connector, outp)) { 71 ret = drm_dp_read_sink_count(aux); 72 if (ret < 0) 73 goto out; 74 75 outp->dp.sink_count = ret; 76 77 /* 78 * Dongle connected, but no display. Don't bother reading 79 * downstream port info 80 */ 81 if (!outp->dp.sink_count) 82 return connector_status_disconnected; 83 } 84 85 ret = drm_dp_read_downstream_info(aux, dpcd, 86 outp->dp.downstream_ports); 87 if (ret < 0) 88 goto out; 89 90 status = connector_status_connected; 91 out: 92 if (status != connector_status_connected) { 93 /* Clear any cached info */ 94 outp->dp.sink_count = 0; 95 } 96 return status; 97 } 98 99 int 100 nouveau_dp_detect(struct nouveau_connector *nv_connector, 101 struct nouveau_encoder *nv_encoder) 102 { 103 struct drm_device *dev = nv_encoder->base.base.dev; 104 struct nouveau_drm *drm = nouveau_drm(dev); 105 struct drm_connector *connector = &nv_connector->base; 106 struct nv50_mstm *mstm = nv_encoder->dp.mstm; 107 enum drm_connector_status status; 108 u8 *dpcd = nv_encoder->dp.dpcd; 109 int ret = NOUVEAU_DP_NONE, hpd; 110 111 /* If we've already read the DPCD on an eDP device, we don't need to 112 * reread it as it won't change 113 */ 114 if (connector->connector_type == DRM_MODE_CONNECTOR_eDP && 115 dpcd[DP_DPCD_REV] != 0) 116 return NOUVEAU_DP_SST; 117 118 mutex_lock(&nv_encoder->dp.hpd_irq_lock); 119 if (mstm) { 120 /* If we're not ready to handle MST state changes yet, just 121 * report the last status of the connector. We'll reprobe it 122 * once we've resumed. 123 */ 124 if (mstm->suspended) { 125 if (mstm->is_mst) 126 ret = NOUVEAU_DP_MST; 127 else if (connector->status == 128 connector_status_connected) 129 ret = NOUVEAU_DP_SST; 130 131 goto out; 132 } 133 } 134 135 /* Check status of HPD pin before attempting an AUX transaction that 136 * would result in a number of (futile) retries on a connector which 137 * has no display plugged. 138 * 139 * TODO: look into checking this before probing I2C to detect DVI/HDMI 140 */ 141 hpd = nvif_conn_hpd_status(&nv_connector->conn); 142 if (hpd == NVIF_CONN_HPD_STATUS_NOT_PRESENT) { 143 nvif_outp_dp_aux_pwr(&nv_encoder->outp, false); 144 goto out; 145 } 146 nvif_outp_dp_aux_pwr(&nv_encoder->outp, true); 147 148 status = nouveau_dp_probe_dpcd(nv_connector, nv_encoder); 149 if (status == connector_status_disconnected) { 150 nvif_outp_dp_aux_pwr(&nv_encoder->outp, false); 151 goto out; 152 } 153 154 /* If we're in MST mode, we're done here */ 155 if (mstm && mstm->can_mst && mstm->is_mst) { 156 ret = NOUVEAU_DP_MST; 157 goto out; 158 } 159 160 nv_encoder->dp.link_bw = 27000 * dpcd[DP_MAX_LINK_RATE]; 161 nv_encoder->dp.link_nr = 162 dpcd[DP_MAX_LANE_COUNT] & DP_MAX_LANE_COUNT_MASK; 163 164 if (connector->connector_type == DRM_MODE_CONNECTOR_eDP && dpcd[DP_DPCD_REV] >= 0x13) { 165 struct drm_dp_aux *aux = &nv_connector->aux; 166 int ret, i; 167 u8 sink_rates[16]; 168 169 ret = drm_dp_dpcd_read(aux, DP_SUPPORTED_LINK_RATES, sink_rates, sizeof(sink_rates)); 170 if (ret == sizeof(sink_rates)) { 171 for (i = 0; i < ARRAY_SIZE(sink_rates); i += 2) { 172 int val = ((sink_rates[i + 1] << 8) | sink_rates[i]) * 200 / 10; 173 if (val && (i == 0 || val > nv_encoder->dp.link_bw)) 174 nv_encoder->dp.link_bw = val; 175 } 176 } 177 } 178 179 NV_DEBUG(drm, "display: %dx%d dpcd 0x%02x\n", 180 nv_encoder->dp.link_nr, nv_encoder->dp.link_bw, 181 dpcd[DP_DPCD_REV]); 182 NV_DEBUG(drm, "encoder: %dx%d\n", 183 nv_encoder->dcb->dpconf.link_nr, 184 nv_encoder->dcb->dpconf.link_bw); 185 186 if (nv_encoder->dcb->dpconf.link_nr < nv_encoder->dp.link_nr) 187 nv_encoder->dp.link_nr = nv_encoder->dcb->dpconf.link_nr; 188 if (nv_encoder->dcb->dpconf.link_bw < nv_encoder->dp.link_bw) 189 nv_encoder->dp.link_bw = nv_encoder->dcb->dpconf.link_bw; 190 191 NV_DEBUG(drm, "maximum: %dx%d\n", 192 nv_encoder->dp.link_nr, nv_encoder->dp.link_bw); 193 194 if (mstm && mstm->can_mst) { 195 ret = nv50_mstm_detect(nv_encoder); 196 if (ret == 1) { 197 ret = NOUVEAU_DP_MST; 198 goto out; 199 } else if (ret != 0) { 200 nvif_outp_dp_aux_pwr(&nv_encoder->outp, false); 201 goto out; 202 } 203 } 204 ret = NOUVEAU_DP_SST; 205 206 out: 207 if (mstm && !mstm->suspended && ret != NOUVEAU_DP_MST) 208 nv50_mstm_remove(mstm); 209 210 mutex_unlock(&nv_encoder->dp.hpd_irq_lock); 211 return ret; 212 } 213 214 bool 215 nouveau_dp_link_check(struct nouveau_connector *nv_connector) 216 { 217 struct nouveau_encoder *nv_encoder = find_encoder(&nv_connector->base, DCB_OUTPUT_DP); 218 219 if (!nv_encoder || nv_encoder->outp.or.id < 0) 220 return true; 221 222 return nvif_outp_dp_retrain(&nv_encoder->outp) == 0; 223 } 224 225 void 226 nouveau_dp_irq(struct work_struct *work) 227 { 228 struct nouveau_connector *nv_connector = 229 container_of(work, typeof(*nv_connector), irq_work); 230 struct drm_connector *connector = &nv_connector->base; 231 struct nouveau_encoder *outp = find_encoder(connector, DCB_OUTPUT_DP); 232 struct nouveau_drm *drm = nouveau_drm(outp->base.base.dev); 233 struct nv50_mstm *mstm; 234 u64 hpd = 0; 235 int ret; 236 237 if (!outp) 238 return; 239 240 mstm = outp->dp.mstm; 241 NV_DEBUG(drm, "service %s\n", connector->name); 242 243 mutex_lock(&outp->dp.hpd_irq_lock); 244 245 if (mstm && mstm->is_mst) { 246 if (!nv50_mstm_service(drm, nv_connector, mstm)) 247 hpd |= NVIF_CONN_EVENT_V0_UNPLUG; 248 } else { 249 drm_dp_cec_irq(&nv_connector->aux); 250 251 if (nouveau_dp_has_sink_count(connector, outp)) { 252 ret = drm_dp_read_sink_count(&nv_connector->aux); 253 if (ret != outp->dp.sink_count) 254 hpd |= NVIF_CONN_EVENT_V0_PLUG; 255 if (ret >= 0) 256 outp->dp.sink_count = ret; 257 } 258 } 259 260 mutex_unlock(&outp->dp.hpd_irq_lock); 261 262 nouveau_connector_hpd(nv_connector, NVIF_CONN_EVENT_V0_IRQ | hpd); 263 } 264 265 /* TODO: 266 * - Validate against the DP caps advertised by the GPU (we don't check these 267 * yet) 268 */ 269 enum drm_mode_status 270 nv50_dp_mode_valid(struct nouveau_encoder *outp, 271 const struct drm_display_mode *mode, 272 unsigned *out_clock) 273 { 274 const unsigned int min_clock = 25000; 275 unsigned int max_rate, mode_rate, ds_max_dotclock, clock = mode->clock; 276 /* Check with the minmum bpc always, so we can advertise better modes. 277 * In particlar not doing this causes modes to be dropped on HDR 278 * displays as we might check with a bpc of 16 even. 279 */ 280 const u8 bpp = 6 * 3; 281 282 if (mode->flags & DRM_MODE_FLAG_INTERLACE && !outp->caps.dp_interlace) 283 return MODE_NO_INTERLACE; 284 285 if ((mode->flags & DRM_MODE_FLAG_3D_MASK) == DRM_MODE_FLAG_3D_FRAME_PACKING) 286 clock *= 2; 287 288 max_rate = outp->dp.link_nr * outp->dp.link_bw; 289 mode_rate = DIV_ROUND_UP(clock * bpp, 8); 290 if (mode_rate > max_rate) 291 return MODE_CLOCK_HIGH; 292 293 ds_max_dotclock = drm_dp_downstream_max_dotclock(outp->dp.dpcd, outp->dp.downstream_ports); 294 if (ds_max_dotclock && clock > ds_max_dotclock) 295 return MODE_CLOCK_HIGH; 296 297 if (clock < min_clock) 298 return MODE_CLOCK_LOW; 299 300 if (out_clock) 301 *out_clock = clock; 302 303 return MODE_OK; 304 } 305