1 /*
2  * drivers/gpu/drm/omapdrm/omap_connector.c
3  *
4  * Copyright (C) 2011 Texas Instruments
5  * Author: Rob Clark <rob@ti.com>
6  *
7  * This program is free software; you can redistribute it and/or modify it
8  * under the terms of the GNU General Public License version 2 as published by
9  * the Free Software Foundation.
10  *
11  * This program is distributed in the hope that it will be useful, but WITHOUT
12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
14  * more details.
15  *
16  * You should have received a copy of the GNU General Public License along with
17  * this program.  If not, see <http://www.gnu.org/licenses/>.
18  */
19 
20 #include "omap_drv.h"
21 
22 #include "drm_crtc.h"
23 #include "drm_crtc_helper.h"
24 
25 /*
26  * connector funcs
27  */
28 
29 #define to_omap_connector(x) container_of(x, struct omap_connector, base)
30 
31 struct omap_connector {
32 	struct drm_connector base;
33 	struct omap_dss_device *dssdev;
34 	struct drm_encoder *encoder;
35 	bool hdmi_mode;
36 };
37 
omap_connector_get_hdmi_mode(struct drm_connector * connector)38 bool omap_connector_get_hdmi_mode(struct drm_connector *connector)
39 {
40 	struct omap_connector *omap_connector = to_omap_connector(connector);
41 
42 	return omap_connector->hdmi_mode;
43 }
44 
copy_timings_omap_to_drm(struct drm_display_mode * mode,struct omap_video_timings * timings)45 void copy_timings_omap_to_drm(struct drm_display_mode *mode,
46 		struct omap_video_timings *timings)
47 {
48 	mode->clock = timings->pixelclock / 1000;
49 
50 	mode->hdisplay = timings->x_res;
51 	mode->hsync_start = mode->hdisplay + timings->hfp;
52 	mode->hsync_end = mode->hsync_start + timings->hsw;
53 	mode->htotal = mode->hsync_end + timings->hbp;
54 
55 	mode->vdisplay = timings->y_res;
56 	mode->vsync_start = mode->vdisplay + timings->vfp;
57 	mode->vsync_end = mode->vsync_start + timings->vsw;
58 	mode->vtotal = mode->vsync_end + timings->vbp;
59 
60 	mode->flags = 0;
61 
62 	if (timings->interlace)
63 		mode->flags |= DRM_MODE_FLAG_INTERLACE;
64 
65 	if (timings->hsync_level == OMAPDSS_SIG_ACTIVE_HIGH)
66 		mode->flags |= DRM_MODE_FLAG_PHSYNC;
67 	else
68 		mode->flags |= DRM_MODE_FLAG_NHSYNC;
69 
70 	if (timings->vsync_level == OMAPDSS_SIG_ACTIVE_HIGH)
71 		mode->flags |= DRM_MODE_FLAG_PVSYNC;
72 	else
73 		mode->flags |= DRM_MODE_FLAG_NVSYNC;
74 }
75 
copy_timings_drm_to_omap(struct omap_video_timings * timings,struct drm_display_mode * mode)76 void copy_timings_drm_to_omap(struct omap_video_timings *timings,
77 		struct drm_display_mode *mode)
78 {
79 	timings->pixelclock = mode->clock * 1000;
80 
81 	timings->x_res = mode->hdisplay;
82 	timings->hfp = mode->hsync_start - mode->hdisplay;
83 	timings->hsw = mode->hsync_end - mode->hsync_start;
84 	timings->hbp = mode->htotal - mode->hsync_end;
85 
86 	timings->y_res = mode->vdisplay;
87 	timings->vfp = mode->vsync_start - mode->vdisplay;
88 	timings->vsw = mode->vsync_end - mode->vsync_start;
89 	timings->vbp = mode->vtotal - mode->vsync_end;
90 
91 	timings->interlace = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
92 
93 	if (mode->flags & DRM_MODE_FLAG_PHSYNC)
94 		timings->hsync_level = OMAPDSS_SIG_ACTIVE_HIGH;
95 	else
96 		timings->hsync_level = OMAPDSS_SIG_ACTIVE_LOW;
97 
98 	if (mode->flags & DRM_MODE_FLAG_PVSYNC)
99 		timings->vsync_level = OMAPDSS_SIG_ACTIVE_HIGH;
100 	else
101 		timings->vsync_level = OMAPDSS_SIG_ACTIVE_LOW;
102 
103 	timings->data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE;
104 	timings->de_level = OMAPDSS_SIG_ACTIVE_HIGH;
105 	timings->sync_pclk_edge = OMAPDSS_DRIVE_SIG_FALLING_EDGE;
106 }
107 
omap_connector_detect(struct drm_connector * connector,bool force)108 static enum drm_connector_status omap_connector_detect(
109 		struct drm_connector *connector, bool force)
110 {
111 	struct omap_connector *omap_connector = to_omap_connector(connector);
112 	struct omap_dss_device *dssdev = omap_connector->dssdev;
113 	struct omap_dss_driver *dssdrv = dssdev->driver;
114 	enum drm_connector_status ret;
115 
116 	if (dssdrv->detect) {
117 		if (dssdrv->detect(dssdev))
118 			ret = connector_status_connected;
119 		else
120 			ret = connector_status_disconnected;
121 	} else if (dssdev->type == OMAP_DISPLAY_TYPE_DPI ||
122 			dssdev->type == OMAP_DISPLAY_TYPE_DBI ||
123 			dssdev->type == OMAP_DISPLAY_TYPE_SDI ||
124 			dssdev->type == OMAP_DISPLAY_TYPE_DSI) {
125 		ret = connector_status_connected;
126 	} else {
127 		ret = connector_status_unknown;
128 	}
129 
130 	VERB("%s: %d (force=%d)", omap_connector->dssdev->name, ret, force);
131 
132 	return ret;
133 }
134 
omap_connector_destroy(struct drm_connector * connector)135 static void omap_connector_destroy(struct drm_connector *connector)
136 {
137 	struct omap_connector *omap_connector = to_omap_connector(connector);
138 	struct omap_dss_device *dssdev = omap_connector->dssdev;
139 
140 	DBG("%s", omap_connector->dssdev->name);
141 	drm_connector_unregister(connector);
142 	drm_connector_cleanup(connector);
143 	kfree(omap_connector);
144 
145 	omap_dss_put_device(dssdev);
146 }
147 
148 #define MAX_EDID  512
149 
omap_connector_get_modes(struct drm_connector * connector)150 static int omap_connector_get_modes(struct drm_connector *connector)
151 {
152 	struct omap_connector *omap_connector = to_omap_connector(connector);
153 	struct omap_dss_device *dssdev = omap_connector->dssdev;
154 	struct omap_dss_driver *dssdrv = dssdev->driver;
155 	struct drm_device *dev = connector->dev;
156 	int n = 0;
157 
158 	DBG("%s", omap_connector->dssdev->name);
159 
160 	/* if display exposes EDID, then we parse that in the normal way to
161 	 * build table of supported modes.. otherwise (ie. fixed resolution
162 	 * LCD panels) we just return a single mode corresponding to the
163 	 * currently configured timings:
164 	 */
165 	if (dssdrv->read_edid) {
166 		void *edid = kzalloc(MAX_EDID, GFP_KERNEL);
167 
168 		if ((dssdrv->read_edid(dssdev, edid, MAX_EDID) > 0) &&
169 				drm_edid_is_valid(edid)) {
170 			drm_mode_connector_update_edid_property(
171 					connector, edid);
172 			n = drm_add_edid_modes(connector, edid);
173 
174 			omap_connector->hdmi_mode =
175 				drm_detect_hdmi_monitor(edid);
176 		} else {
177 			drm_mode_connector_update_edid_property(
178 					connector, NULL);
179 		}
180 
181 		kfree(edid);
182 	} else {
183 		struct drm_display_mode *mode = drm_mode_create(dev);
184 		struct omap_video_timings timings = {0};
185 
186 		dssdrv->get_timings(dssdev, &timings);
187 
188 		copy_timings_omap_to_drm(mode, &timings);
189 
190 		mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
191 		drm_mode_set_name(mode);
192 		drm_mode_probed_add(connector, mode);
193 
194 		n = 1;
195 	}
196 
197 	return n;
198 }
199 
omap_connector_mode_valid(struct drm_connector * connector,struct drm_display_mode * mode)200 static int omap_connector_mode_valid(struct drm_connector *connector,
201 				 struct drm_display_mode *mode)
202 {
203 	struct omap_connector *omap_connector = to_omap_connector(connector);
204 	struct omap_dss_device *dssdev = omap_connector->dssdev;
205 	struct omap_dss_driver *dssdrv = dssdev->driver;
206 	struct omap_video_timings timings = {0};
207 	struct drm_device *dev = connector->dev;
208 	struct drm_display_mode *new_mode;
209 	int r, ret = MODE_BAD;
210 
211 	copy_timings_drm_to_omap(&timings, mode);
212 	mode->vrefresh = drm_mode_vrefresh(mode);
213 
214 	/*
215 	 * if the panel driver doesn't have a check_timings, it's most likely
216 	 * a fixed resolution panel, check if the timings match with the
217 	 * panel's timings
218 	 */
219 	if (dssdrv->check_timings) {
220 		r = dssdrv->check_timings(dssdev, &timings);
221 	} else {
222 		struct omap_video_timings t = {0};
223 
224 		dssdrv->get_timings(dssdev, &t);
225 
226 		if (memcmp(&timings, &t, sizeof(struct omap_video_timings)))
227 			r = -EINVAL;
228 		else
229 			r = 0;
230 	}
231 
232 	if (!r) {
233 		/* check if vrefresh is still valid */
234 		new_mode = drm_mode_duplicate(dev, mode);
235 		new_mode->clock = timings.pixelclock / 1000;
236 		new_mode->vrefresh = 0;
237 		if (mode->vrefresh == drm_mode_vrefresh(new_mode))
238 			ret = MODE_OK;
239 		drm_mode_destroy(dev, new_mode);
240 	}
241 
242 	DBG("connector: mode %s: "
243 			"%d:\"%s\" %d %d %d %d %d %d %d %d %d %d 0x%x 0x%x",
244 			(ret == MODE_OK) ? "valid" : "invalid",
245 			mode->base.id, mode->name, mode->vrefresh, mode->clock,
246 			mode->hdisplay, mode->hsync_start,
247 			mode->hsync_end, mode->htotal,
248 			mode->vdisplay, mode->vsync_start,
249 			mode->vsync_end, mode->vtotal, mode->type, mode->flags);
250 
251 	return ret;
252 }
253 
omap_connector_attached_encoder(struct drm_connector * connector)254 struct drm_encoder *omap_connector_attached_encoder(
255 		struct drm_connector *connector)
256 {
257 	struct omap_connector *omap_connector = to_omap_connector(connector);
258 	return omap_connector->encoder;
259 }
260 
261 static const struct drm_connector_funcs omap_connector_funcs = {
262 	.dpms = drm_helper_connector_dpms,
263 	.detect = omap_connector_detect,
264 	.fill_modes = drm_helper_probe_single_connector_modes,
265 	.destroy = omap_connector_destroy,
266 };
267 
268 static const struct drm_connector_helper_funcs omap_connector_helper_funcs = {
269 	.get_modes = omap_connector_get_modes,
270 	.mode_valid = omap_connector_mode_valid,
271 	.best_encoder = omap_connector_attached_encoder,
272 };
273 
274 /* initialize connector */
omap_connector_init(struct drm_device * dev,int connector_type,struct omap_dss_device * dssdev,struct drm_encoder * encoder)275 struct drm_connector *omap_connector_init(struct drm_device *dev,
276 		int connector_type, struct omap_dss_device *dssdev,
277 		struct drm_encoder *encoder)
278 {
279 	struct drm_connector *connector = NULL;
280 	struct omap_connector *omap_connector;
281 
282 	DBG("%s", dssdev->name);
283 
284 	omap_dss_get_device(dssdev);
285 
286 	omap_connector = kzalloc(sizeof(struct omap_connector), GFP_KERNEL);
287 	if (!omap_connector)
288 		goto fail;
289 
290 	omap_connector->dssdev = dssdev;
291 	omap_connector->encoder = encoder;
292 
293 	connector = &omap_connector->base;
294 
295 	drm_connector_init(dev, connector, &omap_connector_funcs,
296 				connector_type);
297 	drm_connector_helper_add(connector, &omap_connector_helper_funcs);
298 
299 #if 0 /* enable when dss2 supports hotplug */
300 	if (dssdev->caps & OMAP_DSS_DISPLAY_CAP_HPD)
301 		connector->polled = 0;
302 	else
303 #endif
304 		connector->polled = DRM_CONNECTOR_POLL_CONNECT |
305 				DRM_CONNECTOR_POLL_DISCONNECT;
306 
307 	connector->interlace_allowed = 1;
308 	connector->doublescan_allowed = 0;
309 
310 	drm_connector_register(connector);
311 
312 	return connector;
313 
314 fail:
315 	if (connector)
316 		omap_connector_destroy(connector);
317 
318 	return NULL;
319 }
320