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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
4 * Author: Rob Clark <rob@ti.com>
5 */
6
7#include <drm/drm_atomic_helper.h>
8#include <drm/drm_crtc.h>
9#include <drm/drm_panel.h>
10#include <drm/drm_probe_helper.h>
11
12#include "omap_drv.h"
13
14/*
15 * connector funcs
16 */
17
18#define to_omap_connector(x) container_of(x, struct omap_connector, base)
19
20struct omap_connector {
21 struct drm_connector base;
22 struct omap_dss_device *output;
23 struct omap_dss_device *hpd;
24 bool hdmi_mode;
25};
26
27static void omap_connector_hpd_notify(struct drm_connector *connector,
28 enum drm_connector_status status)
29{
30 struct omap_connector *omap_connector = to_omap_connector(connector);
31 struct omap_dss_device *dssdev;
32
33 if (status != connector_status_disconnected)
34 return;
35
36 /*
37 * Notify all devics in the pipeline of disconnection. This is required
38 * to let the HDMI encoders reset their internal state related to
39 * connection status, such as the CEC address.
40 */
41 for (dssdev = omap_connector->output; dssdev; dssdev = dssdev->next) {
42 if (dssdev->ops && dssdev->ops->hdmi.lost_hotplug)
43 dssdev->ops->hdmi.lost_hotplug(dssdev);
44 }
45}
46
47static void omap_connector_hpd_cb(void *cb_data,
48 enum drm_connector_status status)
49{
50 struct omap_connector *omap_connector = cb_data;
51 struct drm_connector *connector = &omap_connector->base;
52 struct drm_device *dev = connector->dev;
53 enum drm_connector_status old_status;
54
55 mutex_lock(&dev->mode_config.mutex);
56 old_status = connector->status;
57 connector->status = status;
58 mutex_unlock(&dev->mode_config.mutex);
59
60 if (old_status == status)
61 return;
62
63 omap_connector_hpd_notify(connector, status);
64
65 drm_kms_helper_hotplug_event(dev);
66}
67
68void omap_connector_enable_hpd(struct drm_connector *connector)
69{
70 struct omap_connector *omap_connector = to_omap_connector(connector);
71 struct omap_dss_device *hpd = omap_connector->hpd;
72
73 if (hpd)
74 hpd->ops->register_hpd_cb(hpd, omap_connector_hpd_cb,
75 omap_connector);
76}
77
78void omap_connector_disable_hpd(struct drm_connector *connector)
79{
80 struct omap_connector *omap_connector = to_omap_connector(connector);
81 struct omap_dss_device *hpd = omap_connector->hpd;
82
83 if (hpd)
84 hpd->ops->unregister_hpd_cb(hpd);
85}
86
87bool omap_connector_get_hdmi_mode(struct drm_connector *connector)
88{
89 struct omap_connector *omap_connector = to_omap_connector(connector);
90
91 return omap_connector->hdmi_mode;
92}
93
94static struct omap_dss_device *
95omap_connector_find_device(struct drm_connector *connector,
96 enum omap_dss_device_ops_flag op)
97{
98 struct omap_connector *omap_connector = to_omap_connector(connector);
99 struct omap_dss_device *dssdev = NULL;
100 struct omap_dss_device *d;
101
102 for (d = omap_connector->output; d; d = d->next) {
103 if (d->ops_flags & op)
104 dssdev = d;
105 }
106
107 return dssdev;
108}
109
110static enum drm_connector_status omap_connector_detect(
111 struct drm_connector *connector, bool force)
112{
113 struct omap_dss_device *dssdev;
114 enum drm_connector_status status;
115
116 dssdev = omap_connector_find_device(connector,
117 OMAP_DSS_DEVICE_OP_DETECT);
118
119 if (dssdev) {
120 status = dssdev->ops->detect(dssdev)
121 ? connector_status_connected
122 : connector_status_disconnected;
123
124 omap_connector_hpd_notify(connector, status);
125 } else {
126 switch (connector->connector_type) {
127 case DRM_MODE_CONNECTOR_DPI:
128 case DRM_MODE_CONNECTOR_LVDS:
129 case DRM_MODE_CONNECTOR_DSI:
130 status = connector_status_connected;
131 break;
132 default:
133 status = connector_status_unknown;
134 break;
135 }
136 }
137
138 VERB("%s: %d (force=%d)", connector->name, status, force);
139
140 return status;
141}
142
143static void omap_connector_destroy(struct drm_connector *connector)
144{
145 struct omap_connector *omap_connector = to_omap_connector(connector);
146
147 DBG("%s", connector->name);
148
149 if (omap_connector->hpd) {
150 struct omap_dss_device *hpd = omap_connector->hpd;
151
152 hpd->ops->unregister_hpd_cb(hpd);
153 omapdss_device_put(hpd);
154 omap_connector->hpd = NULL;
155 }
156
157 drm_connector_unregister(connector);
158 drm_connector_cleanup(connector);
159
160 omapdss_device_put(omap_connector->output);
161
162 kfree(omap_connector);
163}
164
165#define MAX_EDID 512
166
167static int omap_connector_get_modes_edid(struct drm_connector *connector,
168 struct omap_dss_device *dssdev)
169{
170 struct omap_connector *omap_connector = to_omap_connector(connector);
171 enum drm_connector_status status;
172 void *edid;
173 int n;
174
175 status = omap_connector_detect(connector, false);
176 if (status != connector_status_connected)
177 goto no_edid;
178
179 edid = kzalloc(MAX_EDID, GFP_KERNEL);
180 if (!edid)
181 goto no_edid;
182
183 if (dssdev->ops->read_edid(dssdev, edid, MAX_EDID) <= 0 ||
184 !drm_edid_is_valid(edid)) {
185 kfree(edid);
186 goto no_edid;
187 }
188
189 drm_connector_update_edid_property(connector, edid);
190 n = drm_add_edid_modes(connector, edid);
191
192 omap_connector->hdmi_mode = drm_detect_hdmi_monitor(edid);
193
194 kfree(edid);
195 return n;
196
197no_edid:
198 drm_connector_update_edid_property(connector, NULL);
199 return 0;
200}
201
202static int omap_connector_get_modes(struct drm_connector *connector)
203{
204 struct omap_connector *omap_connector = to_omap_connector(connector);
205 struct omap_dss_device *dssdev;
206
207 DBG("%s", connector->name);
208
209 /*
210 * If display exposes EDID, then we parse that in the normal way to
211 * build table of supported modes.
212 */
213 dssdev = omap_connector_find_device(connector,
214 OMAP_DSS_DEVICE_OP_EDID);
215 if (dssdev)
216 return omap_connector_get_modes_edid(connector, dssdev);
217
218 /*
219 * Otherwise if the display pipeline reports modes (e.g. with a fixed
220 * resolution panel or an analog TV output), query it.
221 */
222 dssdev = omap_connector_find_device(connector,
223 OMAP_DSS_DEVICE_OP_MODES);
224 if (dssdev)
225 return dssdev->ops->get_modes(dssdev, connector);
226
227 /*
228 * Otherwise if the display pipeline uses a drm_panel, we delegate the
229 * operation to the panel API.
230 */
231 if (omap_connector->output->panel)
232 return drm_panel_get_modes(omap_connector->output->panel);
233
234 /*
235 * We can't retrieve modes, which can happen for instance for a DVI or
236 * VGA output with the DDC bus unconnected. The KMS core will add the
237 * default modes.
238 */
239 return 0;
240}
241
242enum drm_mode_status omap_connector_mode_fixup(struct omap_dss_device *dssdev,
243 const struct drm_display_mode *mode,
244 struct drm_display_mode *adjusted_mode)
245{
246 int ret;
247
248 drm_mode_copy(adjusted_mode, mode);
249
250 for (; dssdev; dssdev = dssdev->next) {
251 if (!dssdev->ops->check_timings)
252 continue;
253
254 ret = dssdev->ops->check_timings(dssdev, adjusted_mode);
255 if (ret)
256 return MODE_BAD;
257 }
258
259 return MODE_OK;
260}
261
262static enum drm_mode_status omap_connector_mode_valid(struct drm_connector *connector,
263 struct drm_display_mode *mode)
264{
265 struct omap_connector *omap_connector = to_omap_connector(connector);
266 struct drm_display_mode new_mode = { { 0 } };
267 enum drm_mode_status status;
268
269 status = omap_connector_mode_fixup(omap_connector->output, mode,
270 &new_mode);
271 if (status != MODE_OK)
272 goto done;
273
274 /* Check if vrefresh is still valid. */
275 if (drm_mode_vrefresh(mode) != drm_mode_vrefresh(&new_mode))
276 status = MODE_NOCLOCK;
277
278done:
279 DBG("connector: mode %s: " DRM_MODE_FMT,
280 (status == MODE_OK) ? "valid" : "invalid",
281 DRM_MODE_ARG(mode));
282
283 return status;
284}
285
286static const struct drm_connector_funcs omap_connector_funcs = {
287 .reset = drm_atomic_helper_connector_reset,
288 .detect = omap_connector_detect,
289 .fill_modes = drm_helper_probe_single_connector_modes,
290 .destroy = omap_connector_destroy,
291 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
292 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
293};
294
295static const struct drm_connector_helper_funcs omap_connector_helper_funcs = {
296 .get_modes = omap_connector_get_modes,
297 .mode_valid = omap_connector_mode_valid,
298};
299
300static int omap_connector_get_type(struct omap_dss_device *output)
301{
302 struct omap_dss_device *display;
303 enum omap_display_type type;
304
305 display = omapdss_display_get(output);
306 type = display->type;
307 omapdss_device_put(display);
308
309 switch (type) {
310 case OMAP_DISPLAY_TYPE_HDMI:
311 return DRM_MODE_CONNECTOR_HDMIA;
312 case OMAP_DISPLAY_TYPE_DVI:
313 return DRM_MODE_CONNECTOR_DVID;
314 case OMAP_DISPLAY_TYPE_DSI:
315 return DRM_MODE_CONNECTOR_DSI;
316 case OMAP_DISPLAY_TYPE_DPI:
317 case OMAP_DISPLAY_TYPE_DBI:
318 return DRM_MODE_CONNECTOR_DPI;
319 case OMAP_DISPLAY_TYPE_VENC:
320 /* TODO: This could also be composite */
321 return DRM_MODE_CONNECTOR_SVIDEO;
322 case OMAP_DISPLAY_TYPE_SDI:
323 return DRM_MODE_CONNECTOR_LVDS;
324 default:
325 return DRM_MODE_CONNECTOR_Unknown;
326 }
327}
328
329/* initialize connector */
330struct drm_connector *omap_connector_init(struct drm_device *dev,
331 struct omap_dss_device *output,
332 struct drm_encoder *encoder)
333{
334 struct drm_connector *connector = NULL;
335 struct omap_connector *omap_connector;
336 struct omap_dss_device *dssdev;
337
338 DBG("%s", output->name);
339
340 omap_connector = kzalloc(sizeof(*omap_connector), GFP_KERNEL);
341 if (!omap_connector)
342 goto fail;
343
344 omap_connector->output = omapdss_device_get(output);
345
346 connector = &omap_connector->base;
347 connector->interlace_allowed = 1;
348 connector->doublescan_allowed = 0;
349
350 drm_connector_init(dev, connector, &omap_connector_funcs,
351 omap_connector_get_type(output));
352 drm_connector_helper_add(connector, &omap_connector_helper_funcs);
353
354 /*
355 * Initialize connector status handling. First try to find a device that
356 * supports hot-plug reporting. If it fails, fall back to a device that
357 * support polling. If that fails too, we don't support hot-plug
358 * detection at all.
359 */
360 dssdev = omap_connector_find_device(connector, OMAP_DSS_DEVICE_OP_HPD);
361 if (dssdev) {
362 omap_connector->hpd = omapdss_device_get(dssdev);
363 connector->polled = DRM_CONNECTOR_POLL_HPD;
364 } else {
365 dssdev = omap_connector_find_device(connector,
366 OMAP_DSS_DEVICE_OP_DETECT);
367 if (dssdev)
368 connector->polled = DRM_CONNECTOR_POLL_CONNECT |
369 DRM_CONNECTOR_POLL_DISCONNECT;
370 }
371
372 return connector;
373
374fail:
375 if (connector)
376 omap_connector_destroy(connector);
377
378 return NULL;
379}