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};
 36
 37void copy_timings_omap_to_drm(struct drm_display_mode *mode,
 38		struct omap_video_timings *timings)
 39{
 40	mode->clock = timings->pixelclock / 1000;
 41
 42	mode->hdisplay = timings->x_res;
 43	mode->hsync_start = mode->hdisplay + timings->hfp;
 44	mode->hsync_end = mode->hsync_start + timings->hsw;
 45	mode->htotal = mode->hsync_end + timings->hbp;
 46
 47	mode->vdisplay = timings->y_res;
 48	mode->vsync_start = mode->vdisplay + timings->vfp;
 49	mode->vsync_end = mode->vsync_start + timings->vsw;
 50	mode->vtotal = mode->vsync_end + timings->vbp;
 51
 52	mode->flags = 0;
 53
 54	if (timings->interlace)
 55		mode->flags |= DRM_MODE_FLAG_INTERLACE;
 56
 57	if (timings->hsync_level == OMAPDSS_SIG_ACTIVE_HIGH)
 58		mode->flags |= DRM_MODE_FLAG_PHSYNC;
 59	else
 60		mode->flags |= DRM_MODE_FLAG_NHSYNC;
 61
 62	if (timings->vsync_level == OMAPDSS_SIG_ACTIVE_HIGH)
 63		mode->flags |= DRM_MODE_FLAG_PVSYNC;
 64	else
 65		mode->flags |= DRM_MODE_FLAG_NVSYNC;
 66}
 67
 68void copy_timings_drm_to_omap(struct omap_video_timings *timings,
 69		struct drm_display_mode *mode)
 70{
 71	timings->pixelclock = mode->clock * 1000;
 72
 73	timings->x_res = mode->hdisplay;
 74	timings->hfp = mode->hsync_start - mode->hdisplay;
 75	timings->hsw = mode->hsync_end - mode->hsync_start;
 76	timings->hbp = mode->htotal - mode->hsync_end;
 77
 78	timings->y_res = mode->vdisplay;
 79	timings->vfp = mode->vsync_start - mode->vdisplay;
 80	timings->vsw = mode->vsync_end - mode->vsync_start;
 81	timings->vbp = mode->vtotal - mode->vsync_end;
 82
 83	timings->interlace = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
 84
 85	if (mode->flags & DRM_MODE_FLAG_PHSYNC)
 86		timings->hsync_level = OMAPDSS_SIG_ACTIVE_HIGH;
 87	else
 88		timings->hsync_level = OMAPDSS_SIG_ACTIVE_LOW;
 89
 90	if (mode->flags & DRM_MODE_FLAG_PVSYNC)
 91		timings->vsync_level = OMAPDSS_SIG_ACTIVE_HIGH;
 92	else
 93		timings->vsync_level = OMAPDSS_SIG_ACTIVE_LOW;
 94
 95	timings->data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE;
 96	timings->de_level = OMAPDSS_SIG_ACTIVE_HIGH;
 97	timings->sync_pclk_edge = OMAPDSS_DRIVE_SIG_OPPOSITE_EDGES;
 98}
 99
100static enum drm_connector_status omap_connector_detect(
101		struct drm_connector *connector, bool force)
102{
103	struct omap_connector *omap_connector = to_omap_connector(connector);
104	struct omap_dss_device *dssdev = omap_connector->dssdev;
105	struct omap_dss_driver *dssdrv = dssdev->driver;
106	enum drm_connector_status ret;
107
108	if (dssdrv->detect) {
109		if (dssdrv->detect(dssdev))
110			ret = connector_status_connected;
111		else
112			ret = connector_status_disconnected;
113	} else if (dssdev->type == OMAP_DISPLAY_TYPE_DPI ||
114			dssdev->type == OMAP_DISPLAY_TYPE_DBI ||
115			dssdev->type == OMAP_DISPLAY_TYPE_SDI ||
116			dssdev->type == OMAP_DISPLAY_TYPE_DSI) {
117		ret = connector_status_connected;
118	} else {
119		ret = connector_status_unknown;
120	}
121
122	VERB("%s: %d (force=%d)", omap_connector->dssdev->name, ret, force);
123
124	return ret;
125}
126
127static void omap_connector_destroy(struct drm_connector *connector)
128{
129	struct omap_connector *omap_connector = to_omap_connector(connector);
130	struct omap_dss_device *dssdev = omap_connector->dssdev;
131
132	DBG("%s", omap_connector->dssdev->name);
133	drm_sysfs_connector_remove(connector);
134	drm_connector_cleanup(connector);
135	kfree(omap_connector);
136
137	omap_dss_put_device(dssdev);
138}
139
140#define MAX_EDID  512
141
142static int omap_connector_get_modes(struct drm_connector *connector)
143{
144	struct omap_connector *omap_connector = to_omap_connector(connector);
145	struct omap_dss_device *dssdev = omap_connector->dssdev;
146	struct omap_dss_driver *dssdrv = dssdev->driver;
147	struct drm_device *dev = connector->dev;
148	int n = 0;
149
150	DBG("%s", omap_connector->dssdev->name);
151
152	/* if display exposes EDID, then we parse that in the normal way to
153	 * build table of supported modes.. otherwise (ie. fixed resolution
154	 * LCD panels) we just return a single mode corresponding to the
155	 * currently configured timings:
156	 */
157	if (dssdrv->read_edid) {
158		void *edid = kzalloc(MAX_EDID, GFP_KERNEL);
159
160		if ((dssdrv->read_edid(dssdev, edid, MAX_EDID) > 0) &&
161				drm_edid_is_valid(edid)) {
162			drm_mode_connector_update_edid_property(
163					connector, edid);
164			n = drm_add_edid_modes(connector, edid);
165		} else {
166			drm_mode_connector_update_edid_property(
167					connector, NULL);
168		}
169		kfree(edid);
170	} else {
171		struct drm_display_mode *mode = drm_mode_create(dev);
172		struct omap_video_timings timings = {0};
173
174		dssdrv->get_timings(dssdev, &timings);
175
176		copy_timings_omap_to_drm(mode, &timings);
177
178		mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
179		drm_mode_set_name(mode);
180		drm_mode_probed_add(connector, mode);
181
182		n = 1;
183	}
184
185	return n;
186}
187
188static int omap_connector_mode_valid(struct drm_connector *connector,
189				 struct drm_display_mode *mode)
190{
191	struct omap_connector *omap_connector = to_omap_connector(connector);
192	struct omap_dss_device *dssdev = omap_connector->dssdev;
193	struct omap_dss_driver *dssdrv = dssdev->driver;
194	struct omap_video_timings timings = {0};
195	struct drm_device *dev = connector->dev;
196	struct drm_display_mode *new_mode;
197	int r, ret = MODE_BAD;
198
199	copy_timings_drm_to_omap(&timings, mode);
200	mode->vrefresh = drm_mode_vrefresh(mode);
201
202	/*
203	 * if the panel driver doesn't have a check_timings, it's most likely
204	 * a fixed resolution panel, check if the timings match with the
205	 * panel's timings
206	 */
207	if (dssdrv->check_timings) {
208		r = dssdrv->check_timings(dssdev, &timings);
209	} else {
210		struct omap_video_timings t = {0};
211
212		dssdrv->get_timings(dssdev, &t);
213
214		if (memcmp(&timings, &t, sizeof(struct omap_video_timings)))
215			r = -EINVAL;
216		else
217			r = 0;
218	}
219
220	if (!r) {
221		/* check if vrefresh is still valid */
222		new_mode = drm_mode_duplicate(dev, mode);
223		new_mode->clock = timings.pixelclock / 1000;
224		new_mode->vrefresh = 0;
225		if (mode->vrefresh == drm_mode_vrefresh(new_mode))
226			ret = MODE_OK;
227		drm_mode_destroy(dev, new_mode);
228	}
229
230	DBG("connector: mode %s: "
231			"%d:\"%s\" %d %d %d %d %d %d %d %d %d %d 0x%x 0x%x",
232			(ret == MODE_OK) ? "valid" : "invalid",
233			mode->base.id, mode->name, mode->vrefresh, mode->clock,
234			mode->hdisplay, mode->hsync_start,
235			mode->hsync_end, mode->htotal,
236			mode->vdisplay, mode->vsync_start,
237			mode->vsync_end, mode->vtotal, mode->type, mode->flags);
238
239	return ret;
240}
241
242struct drm_encoder *omap_connector_attached_encoder(
243		struct drm_connector *connector)
244{
245	struct omap_connector *omap_connector = to_omap_connector(connector);
246	return omap_connector->encoder;
247}
248
249static const struct drm_connector_funcs omap_connector_funcs = {
250	.dpms = drm_helper_connector_dpms,
251	.detect = omap_connector_detect,
252	.fill_modes = drm_helper_probe_single_connector_modes,
253	.destroy = omap_connector_destroy,
254};
255
256static const struct drm_connector_helper_funcs omap_connector_helper_funcs = {
257	.get_modes = omap_connector_get_modes,
258	.mode_valid = omap_connector_mode_valid,
259	.best_encoder = omap_connector_attached_encoder,
260};
261
262/* flush an area of the framebuffer (in case of manual update display that
263 * is not automatically flushed)
264 */
265void omap_connector_flush(struct drm_connector *connector,
266		int x, int y, int w, int h)
267{
268	struct omap_connector *omap_connector = to_omap_connector(connector);
269
270	/* TODO: enable when supported in dss */
271	VERB("%s: %d,%d, %dx%d", omap_connector->dssdev->name, x, y, w, h);
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_sysfs_connector_add(connector);
311
312	return connector;
313
314fail:
315	if (connector)
316		omap_connector_destroy(connector);
317
318	return NULL;
319}