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 <drm/drm_atomic_helper.h>
 21#include <drm/drm_crtc.h>
 22#include <drm/drm_crtc_helper.h>
 23
 24#include "omap_drv.h"
 25
 26/*
 27 * connector funcs
 28 */
 29
 30#define to_omap_connector(x) container_of(x, struct omap_connector, base)
 31
 32struct omap_connector {
 33	struct drm_connector base;
 34	struct omap_dss_device *dssdev;
 35	struct drm_encoder *encoder;
 36	bool hdmi_mode;
 37};
 38
 39bool omap_connector_get_hdmi_mode(struct drm_connector *connector)
 40{
 41	struct omap_connector *omap_connector = to_omap_connector(connector);
 42
 43	return omap_connector->hdmi_mode;
 44}
 45
 46void copy_timings_omap_to_drm(struct drm_display_mode *mode,
 47		struct omap_video_timings *timings)
 48{
 49	mode->clock = timings->pixelclock / 1000;
 50
 51	mode->hdisplay = timings->x_res;
 52	mode->hsync_start = mode->hdisplay + timings->hfp;
 53	mode->hsync_end = mode->hsync_start + timings->hsw;
 54	mode->htotal = mode->hsync_end + timings->hbp;
 55
 56	mode->vdisplay = timings->y_res;
 57	mode->vsync_start = mode->vdisplay + timings->vfp;
 58	mode->vsync_end = mode->vsync_start + timings->vsw;
 59	mode->vtotal = mode->vsync_end + timings->vbp;
 60
 61	mode->flags = 0;
 62
 63	if (timings->interlace)
 64		mode->flags |= DRM_MODE_FLAG_INTERLACE;
 65
 66	if (timings->double_pixel)
 67		mode->flags |= DRM_MODE_FLAG_DBLCLK;
 68
 69	if (timings->hsync_level == OMAPDSS_SIG_ACTIVE_HIGH)
 70		mode->flags |= DRM_MODE_FLAG_PHSYNC;
 71	else
 72		mode->flags |= DRM_MODE_FLAG_NHSYNC;
 73
 74	if (timings->vsync_level == OMAPDSS_SIG_ACTIVE_HIGH)
 75		mode->flags |= DRM_MODE_FLAG_PVSYNC;
 76	else
 77		mode->flags |= DRM_MODE_FLAG_NVSYNC;
 78}
 79
 80void copy_timings_drm_to_omap(struct omap_video_timings *timings,
 81		struct drm_display_mode *mode)
 82{
 83	timings->pixelclock = mode->clock * 1000;
 84
 85	timings->x_res = mode->hdisplay;
 86	timings->hfp = mode->hsync_start - mode->hdisplay;
 87	timings->hsw = mode->hsync_end - mode->hsync_start;
 88	timings->hbp = mode->htotal - mode->hsync_end;
 89
 90	timings->y_res = mode->vdisplay;
 91	timings->vfp = mode->vsync_start - mode->vdisplay;
 92	timings->vsw = mode->vsync_end - mode->vsync_start;
 93	timings->vbp = mode->vtotal - mode->vsync_end;
 94
 95	timings->interlace = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
 96	timings->double_pixel = !!(mode->flags & DRM_MODE_FLAG_DBLCLK);
 97
 98	if (mode->flags & DRM_MODE_FLAG_PHSYNC)
 99		timings->hsync_level = OMAPDSS_SIG_ACTIVE_HIGH;
100	else
101		timings->hsync_level = OMAPDSS_SIG_ACTIVE_LOW;
102
103	if (mode->flags & DRM_MODE_FLAG_PVSYNC)
104		timings->vsync_level = OMAPDSS_SIG_ACTIVE_HIGH;
105	else
106		timings->vsync_level = OMAPDSS_SIG_ACTIVE_LOW;
107
108	timings->data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE;
109	timings->de_level = OMAPDSS_SIG_ACTIVE_HIGH;
110	timings->sync_pclk_edge = OMAPDSS_DRIVE_SIG_FALLING_EDGE;
111}
112
113static enum drm_connector_status omap_connector_detect(
114		struct drm_connector *connector, bool force)
115{
116	struct omap_connector *omap_connector = to_omap_connector(connector);
117	struct omap_dss_device *dssdev = omap_connector->dssdev;
118	struct omap_dss_driver *dssdrv = dssdev->driver;
119	enum drm_connector_status ret;
120
121	if (dssdrv->detect) {
122		if (dssdrv->detect(dssdev))
123			ret = connector_status_connected;
124		else
125			ret = connector_status_disconnected;
126	} else if (dssdev->type == OMAP_DISPLAY_TYPE_DPI ||
127			dssdev->type == OMAP_DISPLAY_TYPE_DBI ||
128			dssdev->type == OMAP_DISPLAY_TYPE_SDI ||
129			dssdev->type == OMAP_DISPLAY_TYPE_DSI) {
130		ret = connector_status_connected;
131	} else {
132		ret = connector_status_unknown;
133	}
134
135	VERB("%s: %d (force=%d)", omap_connector->dssdev->name, ret, force);
136
137	return ret;
138}
139
140static void omap_connector_destroy(struct drm_connector *connector)
141{
142	struct omap_connector *omap_connector = to_omap_connector(connector);
143	struct omap_dss_device *dssdev = omap_connector->dssdev;
144
145	DBG("%s", omap_connector->dssdev->name);
146	drm_connector_unregister(connector);
147	drm_connector_cleanup(connector);
148	kfree(omap_connector);
149
150	omap_dss_put_device(dssdev);
151}
152
153#define MAX_EDID  512
154
155static int omap_connector_get_modes(struct drm_connector *connector)
156{
157	struct omap_connector *omap_connector = to_omap_connector(connector);
158	struct omap_dss_device *dssdev = omap_connector->dssdev;
159	struct omap_dss_driver *dssdrv = dssdev->driver;
160	struct drm_device *dev = connector->dev;
161	int n = 0;
162
163	DBG("%s", omap_connector->dssdev->name);
164
165	/* if display exposes EDID, then we parse that in the normal way to
166	 * build table of supported modes.. otherwise (ie. fixed resolution
167	 * LCD panels) we just return a single mode corresponding to the
168	 * currently configured timings:
169	 */
170	if (dssdrv->read_edid) {
171		void *edid = kzalloc(MAX_EDID, GFP_KERNEL);
172
173		if ((dssdrv->read_edid(dssdev, edid, MAX_EDID) > 0) &&
174				drm_edid_is_valid(edid)) {
175			drm_mode_connector_update_edid_property(
176					connector, edid);
177			n = drm_add_edid_modes(connector, edid);
178
179			omap_connector->hdmi_mode =
180				drm_detect_hdmi_monitor(edid);
181		} else {
182			drm_mode_connector_update_edid_property(
183					connector, NULL);
184		}
185
186		kfree(edid);
187	} else {
188		struct drm_display_mode *mode = drm_mode_create(dev);
189		struct omap_video_timings timings = {0};
190
191		dssdrv->get_timings(dssdev, &timings);
192
193		copy_timings_omap_to_drm(mode, &timings);
194
195		mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
196		drm_mode_set_name(mode);
197		drm_mode_probed_add(connector, mode);
198
199		n = 1;
200	}
201
202	return n;
203}
204
205static int omap_connector_mode_valid(struct drm_connector *connector,
206				 struct drm_display_mode *mode)
207{
208	struct omap_connector *omap_connector = to_omap_connector(connector);
209	struct omap_dss_device *dssdev = omap_connector->dssdev;
210	struct omap_dss_driver *dssdrv = dssdev->driver;
211	struct omap_video_timings timings = {0};
212	struct drm_device *dev = connector->dev;
213	struct drm_display_mode *new_mode;
214	int r, ret = MODE_BAD;
215
216	copy_timings_drm_to_omap(&timings, mode);
217	mode->vrefresh = drm_mode_vrefresh(mode);
218
219	/*
220	 * if the panel driver doesn't have a check_timings, it's most likely
221	 * a fixed resolution panel, check if the timings match with the
222	 * panel's timings
223	 */
224	if (dssdrv->check_timings) {
225		r = dssdrv->check_timings(dssdev, &timings);
226	} else {
227		struct omap_video_timings t = {0};
228
229		dssdrv->get_timings(dssdev, &t);
230
231		if (memcmp(&timings, &t, sizeof(struct omap_video_timings)))
232			r = -EINVAL;
233		else
234			r = 0;
235	}
236
237	if (!r) {
238		/* check if vrefresh is still valid */
239		new_mode = drm_mode_duplicate(dev, mode);
240		new_mode->clock = timings.pixelclock / 1000;
241		new_mode->vrefresh = 0;
242		if (mode->vrefresh == drm_mode_vrefresh(new_mode))
243			ret = MODE_OK;
244		drm_mode_destroy(dev, new_mode);
245	}
246
247	DBG("connector: mode %s: "
248			"%d:\"%s\" %d %d %d %d %d %d %d %d %d %d 0x%x 0x%x",
249			(ret == MODE_OK) ? "valid" : "invalid",
250			mode->base.id, mode->name, mode->vrefresh, mode->clock,
251			mode->hdisplay, mode->hsync_start,
252			mode->hsync_end, mode->htotal,
253			mode->vdisplay, mode->vsync_start,
254			mode->vsync_end, mode->vtotal, mode->type, mode->flags);
255
256	return ret;
257}
258
259struct drm_encoder *omap_connector_attached_encoder(
260		struct drm_connector *connector)
261{
262	struct omap_connector *omap_connector = to_omap_connector(connector);
263	return omap_connector->encoder;
264}
265
266static const struct drm_connector_funcs omap_connector_funcs = {
267	.dpms = drm_atomic_helper_connector_dpms,
268	.reset = drm_atomic_helper_connector_reset,
269	.detect = omap_connector_detect,
270	.fill_modes = drm_helper_probe_single_connector_modes,
271	.destroy = omap_connector_destroy,
272	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
273	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
274};
275
276static const struct drm_connector_helper_funcs omap_connector_helper_funcs = {
277	.get_modes = omap_connector_get_modes,
278	.mode_valid = omap_connector_mode_valid,
279	.best_encoder = omap_connector_attached_encoder,
280};
281
282/* initialize connector */
283struct drm_connector *omap_connector_init(struct drm_device *dev,
284		int connector_type, struct omap_dss_device *dssdev,
285		struct drm_encoder *encoder)
286{
287	struct drm_connector *connector = NULL;
288	struct omap_connector *omap_connector;
289
290	DBG("%s", dssdev->name);
291
292	omap_dss_get_device(dssdev);
293
294	omap_connector = kzalloc(sizeof(struct omap_connector), GFP_KERNEL);
295	if (!omap_connector)
296		goto fail;
297
298	omap_connector->dssdev = dssdev;
299	omap_connector->encoder = encoder;
300
301	connector = &omap_connector->base;
302
303	drm_connector_init(dev, connector, &omap_connector_funcs,
304				connector_type);
305	drm_connector_helper_add(connector, &omap_connector_helper_funcs);
306
307#if 0 /* enable when dss2 supports hotplug */
308	if (dssdev->caps & OMAP_DSS_DISPLAY_CAP_HPD)
309		connector->polled = 0;
310	else
311#endif
312		connector->polled = DRM_CONNECTOR_POLL_CONNECT |
313				DRM_CONNECTOR_POLL_DISCONNECT;
314
315	connector->interlace_allowed = 1;
316	connector->doublescan_allowed = 0;
317
318	drm_connector_register(connector);
319
320	return connector;
321
322fail:
323	if (connector)
324		omap_connector_destroy(connector);
325
326	return NULL;
327}