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
31struct omap_connector {
32	struct drm_connector base;
33	struct omap_dss_device *dssdev;
34	struct drm_encoder *encoder;
35	bool hdmi_mode;
36};
37
38bool 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
45void 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
76void 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
108static 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
135static 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
150static 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
200static 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
254struct 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
261static 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
268static 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 */
275struct 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
314fail:
315	if (connector)
316		omap_connector_destroy(connector);
317
318	return NULL;
319}
320