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
nouveau_dp_has_sink_count(struct drm_connector * connector,struct nouveau_encoder * outp)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
nouveau_dp_probe_dpcd(struct nouveau_connector * nv_connector,struct nouveau_encoder * outp)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
nouveau_dp_detect(struct nouveau_connector * nv_connector,struct nouveau_encoder * nv_encoder)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, hpd;
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 /* Check status of HPD pin before attempting an AUX transaction that
137 * would result in a number of (futile) retries on a connector which
138 * has no display plugged.
139 *
140 * TODO: look into checking this before probing I2C to detect DVI/HDMI
141 */
142 hpd = nvif_conn_hpd_status(&nv_connector->conn);
143 if (hpd == NVIF_CONN_HPD_STATUS_NOT_PRESENT)
144 goto out;
145
146 status = nouveau_dp_probe_dpcd(nv_connector, nv_encoder);
147 if (status == connector_status_disconnected)
148 goto out;
149
150 /* If we're in MST mode, we're done here */
151 if (mstm && mstm->can_mst && mstm->is_mst) {
152 ret = NOUVEAU_DP_MST;
153 goto out;
154 }
155
156 nv_encoder->dp.link_bw = 27000 * dpcd[DP_MAX_LINK_RATE];
157 nv_encoder->dp.link_nr =
158 dpcd[DP_MAX_LANE_COUNT] & DP_MAX_LANE_COUNT_MASK;
159
160 if (connector->connector_type == DRM_MODE_CONNECTOR_eDP && dpcd[DP_DPCD_REV] >= 0x13) {
161 struct drm_dp_aux *aux = &nv_connector->aux;
162 int ret, i;
163 u8 sink_rates[16];
164
165 ret = drm_dp_dpcd_read(aux, DP_SUPPORTED_LINK_RATES, sink_rates, sizeof(sink_rates));
166 if (ret == sizeof(sink_rates)) {
167 for (i = 0; i < ARRAY_SIZE(sink_rates); i += 2) {
168 int val = ((sink_rates[i + 1] << 8) | sink_rates[i]) * 200 / 10;
169 if (val && (i == 0 || val > nv_encoder->dp.link_bw))
170 nv_encoder->dp.link_bw = val;
171 }
172 }
173 }
174
175 NV_DEBUG(drm, "display: %dx%d dpcd 0x%02x\n",
176 nv_encoder->dp.link_nr, nv_encoder->dp.link_bw,
177 dpcd[DP_DPCD_REV]);
178 NV_DEBUG(drm, "encoder: %dx%d\n",
179 nv_encoder->dcb->dpconf.link_nr,
180 nv_encoder->dcb->dpconf.link_bw);
181
182 if (nv_encoder->dcb->dpconf.link_nr < nv_encoder->dp.link_nr)
183 nv_encoder->dp.link_nr = nv_encoder->dcb->dpconf.link_nr;
184 if (nv_encoder->dcb->dpconf.link_bw < nv_encoder->dp.link_bw)
185 nv_encoder->dp.link_bw = nv_encoder->dcb->dpconf.link_bw;
186
187 NV_DEBUG(drm, "maximum: %dx%d\n",
188 nv_encoder->dp.link_nr, nv_encoder->dp.link_bw);
189
190 if (mstm && mstm->can_mst) {
191 ret = nv50_mstm_detect(nv_encoder);
192 if (ret == 1) {
193 ret = NOUVEAU_DP_MST;
194 goto out;
195 } else if (ret != 0) {
196 goto out;
197 }
198 }
199 ret = NOUVEAU_DP_SST;
200
201 out:
202 if (mstm && !mstm->suspended && ret != NOUVEAU_DP_MST)
203 nv50_mstm_remove(mstm);
204
205 mutex_unlock(&nv_encoder->dp.hpd_irq_lock);
206 return ret;
207 }
208
nouveau_dp_irq(struct nouveau_drm * drm,struct nouveau_connector * nv_connector)209 void nouveau_dp_irq(struct nouveau_drm *drm,
210 struct nouveau_connector *nv_connector)
211 {
212 struct drm_connector *connector = &nv_connector->base;
213 struct nouveau_encoder *outp = find_encoder(connector, DCB_OUTPUT_DP);
214 struct nv50_mstm *mstm;
215 int ret;
216 bool send_hpd = false;
217
218 if (!outp)
219 return;
220
221 mstm = outp->dp.mstm;
222 NV_DEBUG(drm, "service %s\n", connector->name);
223
224 mutex_lock(&outp->dp.hpd_irq_lock);
225
226 if (mstm && mstm->is_mst) {
227 if (!nv50_mstm_service(drm, nv_connector, mstm))
228 send_hpd = true;
229 } else {
230 drm_dp_cec_irq(&nv_connector->aux);
231
232 if (nouveau_dp_has_sink_count(connector, outp)) {
233 ret = drm_dp_read_sink_count(&nv_connector->aux);
234 if (ret != outp->dp.sink_count)
235 send_hpd = true;
236 if (ret >= 0)
237 outp->dp.sink_count = ret;
238 }
239 }
240
241 mutex_unlock(&outp->dp.hpd_irq_lock);
242
243 if (send_hpd)
244 nouveau_connector_hpd(connector);
245 }
246
247 /* TODO:
248 * - Validate against the DP caps advertised by the GPU (we don't check these
249 * yet)
250 */
251 enum drm_mode_status
nv50_dp_mode_valid(struct drm_connector * connector,struct nouveau_encoder * outp,const struct drm_display_mode * mode,unsigned * out_clock)252 nv50_dp_mode_valid(struct drm_connector *connector,
253 struct nouveau_encoder *outp,
254 const struct drm_display_mode *mode,
255 unsigned *out_clock)
256 {
257 const unsigned int min_clock = 25000;
258 unsigned int max_rate, mode_rate, ds_max_dotclock, clock = mode->clock;
259 /* Check with the minmum bpc always, so we can advertise better modes.
260 * In particlar not doing this causes modes to be dropped on HDR
261 * displays as we might check with a bpc of 16 even.
262 */
263 const u8 bpp = 6 * 3;
264
265 if (mode->flags & DRM_MODE_FLAG_INTERLACE && !outp->caps.dp_interlace)
266 return MODE_NO_INTERLACE;
267
268 if ((mode->flags & DRM_MODE_FLAG_3D_MASK) == DRM_MODE_FLAG_3D_FRAME_PACKING)
269 clock *= 2;
270
271 max_rate = outp->dp.link_nr * outp->dp.link_bw;
272 mode_rate = DIV_ROUND_UP(clock * bpp, 8);
273 if (mode_rate > max_rate)
274 return MODE_CLOCK_HIGH;
275
276 ds_max_dotclock = drm_dp_downstream_max_dotclock(outp->dp.dpcd, outp->dp.downstream_ports);
277 if (ds_max_dotclock && clock > ds_max_dotclock)
278 return MODE_CLOCK_HIGH;
279
280 if (clock < min_clock)
281 return MODE_CLOCK_LOW;
282
283 if (out_clock)
284 *out_clock = clock;
285
286 return MODE_OK;
287 }
288