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/class.h> 33 #include <nvif/cl5070.h> 34 35 MODULE_PARM_DESC(mst, "Enable DisplayPort multi-stream (default: enabled)"); 36 static int nouveau_mst = 1; 37 module_param_named(mst, nouveau_mst, int, 0400); 38 39 static bool 40 nouveau_dp_has_sink_count(struct drm_connector *connector, 41 struct nouveau_encoder *outp) 42 { 43 return drm_dp_read_sink_count_cap(connector, outp->dp.dpcd, &outp->dp.desc); 44 } 45 46 static enum drm_connector_status 47 nouveau_dp_probe_dpcd(struct nouveau_connector *nv_connector, 48 struct nouveau_encoder *outp) 49 { 50 struct drm_connector *connector = &nv_connector->base; 51 struct drm_dp_aux *aux = &nv_connector->aux; 52 struct nv50_mstm *mstm = NULL; 53 enum drm_connector_status status = connector_status_disconnected; 54 int ret; 55 u8 *dpcd = outp->dp.dpcd; 56 57 ret = drm_dp_read_dpcd_caps(aux, dpcd); 58 if (ret < 0) 59 goto out; 60 61 ret = drm_dp_read_desc(aux, &outp->dp.desc, drm_dp_is_branch(dpcd)); 62 if (ret < 0) 63 goto out; 64 65 if (nouveau_mst) { 66 mstm = outp->dp.mstm; 67 if (mstm) 68 mstm->can_mst = drm_dp_read_mst_cap(aux, dpcd); 69 } 70 71 if (nouveau_dp_has_sink_count(connector, outp)) { 72 ret = drm_dp_read_sink_count(aux); 73 if (ret < 0) 74 goto out; 75 76 outp->dp.sink_count = ret; 77 78 /* 79 * Dongle connected, but no display. Don't bother reading 80 * downstream port info 81 */ 82 if (!outp->dp.sink_count) 83 return connector_status_disconnected; 84 } 85 86 ret = drm_dp_read_downstream_info(aux, dpcd, 87 outp->dp.downstream_ports); 88 if (ret < 0) 89 goto out; 90 91 status = connector_status_connected; 92 out: 93 if (status != connector_status_connected) { 94 /* Clear any cached info */ 95 outp->dp.sink_count = 0; 96 } 97 return status; 98 } 99 100 int 101 nouveau_dp_detect(struct nouveau_connector *nv_connector, 102 struct nouveau_encoder *nv_encoder) 103 { 104 struct drm_device *dev = nv_encoder->base.base.dev; 105 struct nouveau_drm *drm = nouveau_drm(dev); 106 struct drm_connector *connector = &nv_connector->base; 107 struct nv50_mstm *mstm = nv_encoder->dp.mstm; 108 enum drm_connector_status status; 109 u8 *dpcd = nv_encoder->dp.dpcd; 110 int ret = NOUVEAU_DP_NONE; 111 112 /* If we've already read the DPCD on an eDP device, we don't need to 113 * reread it as it won't change 114 */ 115 if (connector->connector_type == DRM_MODE_CONNECTOR_eDP && 116 dpcd[DP_DPCD_REV] != 0) 117 return NOUVEAU_DP_SST; 118 119 mutex_lock(&nv_encoder->dp.hpd_irq_lock); 120 if (mstm) { 121 /* If we're not ready to handle MST state changes yet, just 122 * report the last status of the connector. We'll reprobe it 123 * once we've resumed. 124 */ 125 if (mstm->suspended) { 126 if (mstm->is_mst) 127 ret = NOUVEAU_DP_MST; 128 else if (connector->status == 129 connector_status_connected) 130 ret = NOUVEAU_DP_SST; 131 132 goto out; 133 } 134 } 135 136 status = nouveau_dp_probe_dpcd(nv_connector, nv_encoder); 137 if (status == connector_status_disconnected) 138 goto out; 139 140 /* If we're in MST mode, we're done here */ 141 if (mstm && mstm->can_mst && mstm->is_mst) { 142 ret = NOUVEAU_DP_MST; 143 goto out; 144 } 145 146 nv_encoder->dp.link_bw = 27000 * dpcd[DP_MAX_LINK_RATE]; 147 nv_encoder->dp.link_nr = 148 dpcd[DP_MAX_LANE_COUNT] & DP_MAX_LANE_COUNT_MASK; 149 150 if (connector->connector_type == DRM_MODE_CONNECTOR_eDP && dpcd[DP_DPCD_REV] >= 0x13) { 151 struct drm_dp_aux *aux = &nv_connector->aux; 152 int ret, i; 153 u8 sink_rates[16]; 154 155 ret = drm_dp_dpcd_read(aux, DP_SUPPORTED_LINK_RATES, sink_rates, sizeof(sink_rates)); 156 if (ret == sizeof(sink_rates)) { 157 for (i = 0; i < ARRAY_SIZE(sink_rates); i += 2) { 158 int val = ((sink_rates[i + 1] << 8) | sink_rates[i]) * 200 / 10; 159 if (val && (i == 0 || val > nv_encoder->dp.link_bw)) 160 nv_encoder->dp.link_bw = val; 161 } 162 } 163 } 164 165 NV_DEBUG(drm, "display: %dx%d dpcd 0x%02x\n", 166 nv_encoder->dp.link_nr, nv_encoder->dp.link_bw, 167 dpcd[DP_DPCD_REV]); 168 NV_DEBUG(drm, "encoder: %dx%d\n", 169 nv_encoder->dcb->dpconf.link_nr, 170 nv_encoder->dcb->dpconf.link_bw); 171 172 if (nv_encoder->dcb->dpconf.link_nr < nv_encoder->dp.link_nr) 173 nv_encoder->dp.link_nr = nv_encoder->dcb->dpconf.link_nr; 174 if (nv_encoder->dcb->dpconf.link_bw < nv_encoder->dp.link_bw) 175 nv_encoder->dp.link_bw = nv_encoder->dcb->dpconf.link_bw; 176 177 NV_DEBUG(drm, "maximum: %dx%d\n", 178 nv_encoder->dp.link_nr, nv_encoder->dp.link_bw); 179 180 if (mstm && mstm->can_mst) { 181 ret = nv50_mstm_detect(nv_encoder); 182 if (ret == 1) { 183 ret = NOUVEAU_DP_MST; 184 goto out; 185 } else if (ret != 0) { 186 goto out; 187 } 188 } 189 ret = NOUVEAU_DP_SST; 190 191 out: 192 if (mstm && !mstm->suspended && ret != NOUVEAU_DP_MST) 193 nv50_mstm_remove(mstm); 194 195 mutex_unlock(&nv_encoder->dp.hpd_irq_lock); 196 return ret; 197 } 198 199 void nouveau_dp_irq(struct nouveau_drm *drm, 200 struct nouveau_connector *nv_connector) 201 { 202 struct drm_connector *connector = &nv_connector->base; 203 struct nouveau_encoder *outp = find_encoder(connector, DCB_OUTPUT_DP); 204 struct nv50_mstm *mstm; 205 int ret; 206 bool send_hpd = false; 207 208 if (!outp) 209 return; 210 211 mstm = outp->dp.mstm; 212 NV_DEBUG(drm, "service %s\n", connector->name); 213 214 mutex_lock(&outp->dp.hpd_irq_lock); 215 216 if (mstm && mstm->is_mst) { 217 if (!nv50_mstm_service(drm, nv_connector, mstm)) 218 send_hpd = true; 219 } else { 220 drm_dp_cec_irq(&nv_connector->aux); 221 222 if (nouveau_dp_has_sink_count(connector, outp)) { 223 ret = drm_dp_read_sink_count(&nv_connector->aux); 224 if (ret != outp->dp.sink_count) 225 send_hpd = true; 226 if (ret >= 0) 227 outp->dp.sink_count = ret; 228 } 229 } 230 231 mutex_unlock(&outp->dp.hpd_irq_lock); 232 233 if (send_hpd) 234 nouveau_connector_hpd(connector); 235 } 236 237 /* TODO: 238 * - Use the minimum possible BPC here, once we add support for the max bpc 239 * property. 240 * - Validate against the DP caps advertised by the GPU (we don't check these 241 * yet) 242 */ 243 enum drm_mode_status 244 nv50_dp_mode_valid(struct drm_connector *connector, 245 struct nouveau_encoder *outp, 246 const struct drm_display_mode *mode, 247 unsigned *out_clock) 248 { 249 const unsigned int min_clock = 25000; 250 unsigned int max_rate, mode_rate, ds_max_dotclock, clock = mode->clock; 251 const u8 bpp = connector->display_info.bpc * 3; 252 253 if (mode->flags & DRM_MODE_FLAG_INTERLACE && !outp->caps.dp_interlace) 254 return MODE_NO_INTERLACE; 255 256 if ((mode->flags & DRM_MODE_FLAG_3D_MASK) == DRM_MODE_FLAG_3D_FRAME_PACKING) 257 clock *= 2; 258 259 max_rate = outp->dp.link_nr * outp->dp.link_bw; 260 mode_rate = DIV_ROUND_UP(clock * bpp, 8); 261 if (mode_rate > max_rate) 262 return MODE_CLOCK_HIGH; 263 264 ds_max_dotclock = drm_dp_downstream_max_dotclock(outp->dp.dpcd, outp->dp.downstream_ports); 265 if (ds_max_dotclock && clock > ds_max_dotclock) 266 return MODE_CLOCK_HIGH; 267 268 if (clock < min_clock) 269 return MODE_CLOCK_LOW; 270 271 if (out_clock) 272 *out_clock = clock; 273 274 return MODE_OK; 275 } 276