drivers/staging/omapdrm/omap_connector.c

   1 /*
   2  * drivers/staging/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 };
  35
  36 static inline void copy_timings_omap_to_drm(struct drm_display_mode *mode,
  37                 struct omap_video_timings *timings)
  38 {
  39         mode->clock = timings->pixel_clock;
  40
  41         mode->hdisplay = timings->x_res;
  42         mode->hsync_start = mode->hdisplay + timings->hfp;
  43         mode->hsync_end = mode->hsync_start + timings->hsw;
  44         mode->htotal = mode->hsync_end + timings->hbp;
  45
  46         mode->vdisplay = timings->y_res;
  47         mode->vsync_start = mode->vdisplay + timings->vfp;
  48         mode->vsync_end = mode->vsync_start + timings->vsw;
  49         mode->vtotal = mode->vsync_end + timings->vbp;
  50
  51         /* note: whether or not it is interlaced, +/- h/vsync, etc,
  52          * which should be set in the mode flags, is not exposed in
  53          * the omap_video_timings struct.. but hdmi driver tracks
  54          * those separately so all we have to have to set the mode
  55          * is the way to recover these timings values, and the
  56          * omap_dss_driver would do the rest.
  57          */
  58 }
  59
  60 static inline void copy_timings_drm_to_omap(struct omap_video_timings *timings,
  61                 struct drm_display_mode *mode)
  62 {
  63         timings->pixel_clock = mode->clock;
  64
  65         timings->x_res = mode->hdisplay;
  66         timings->hfp = mode->hsync_start - mode->hdisplay;
  67         timings->hsw = mode->hsync_end - mode->hsync_start;
  68         timings->hbp = mode->htotal - mode->hsync_end;
  69
  70         timings->y_res = mode->vdisplay;
  71         timings->vfp = mode->vsync_start - mode->vdisplay;
  72         timings->vsw = mode->vsync_end - mode->vsync_start;
  73         timings->vbp = mode->vtotal - mode->vsync_end;
  74 }
  75
  76 static void omap_connector_dpms(struct drm_connector *connector, int mode)
  77 {
  78         struct omap_connector *omap_connector = to_omap_connector(connector);
  79         struct omap_dss_device *dssdev = omap_connector->dssdev;
  80         int old_dpms;
  81
  82         DBG("%s: %d", dssdev->name, mode);
  83
  84         old_dpms = connector->dpms;
  85
  86         /* from off to on, do from crtc to connector */
  87         if (mode < old_dpms)
  88                 drm_helper_connector_dpms(connector, mode);
  89
  90         if (mode == DRM_MODE_DPMS_ON) {
  91                 /* store resume info for suspended displays */
  92                 switch (dssdev->state) {
  93                 case OMAP_DSS_DISPLAY_SUSPENDED:
  94                         dssdev->activate_after_resume = true;
  95                         break;
  96                 case OMAP_DSS_DISPLAY_DISABLED: {
  97                         int ret = dssdev->driver->enable(dssdev);
  98                         if (ret) {
  99                                 DBG("%s: failed to enable: %d",
 100                                                 dssdev->name, ret);
 101                                 dssdev->driver->disable(dssdev);
 102                         }
 103                         break;
 104                 }
 105                 default:
 106                         break;
 107                 }
 108         } else {
 109                 /* TODO */
 110         }
 111
 112         /* from on to off, do from connector to crtc */
 113         if (mode > old_dpms)
 114                 drm_helper_connector_dpms(connector, mode);
 115 }
 116
 117 enum drm_connector_status omap_connector_detect(
 118                 struct drm_connector *connector, bool force)
 119 {
 120         struct omap_connector *omap_connector = to_omap_connector(connector);
 121         struct omap_dss_device *dssdev = omap_connector->dssdev;
 122         struct omap_dss_driver *dssdrv = dssdev->driver;
 123         enum drm_connector_status ret;
 124
 125         if (dssdrv->detect) {
 126                 if (dssdrv->detect(dssdev)) {
 127                         ret = connector_status_connected;
 128                 } else {
 129                         ret = connector_status_disconnected;
 130                 }
 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
 140 static 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         dssdev->driver->disable(dssdev);
 146
 147         DBG("%s", omap_connector->dssdev->name);
 148         drm_sysfs_connector_remove(connector);
 149         drm_connector_cleanup(connector);
 150         kfree(omap_connector);
 151
 152         omap_dss_put_device(dssdev);
 153 }
 154
 155 #define MAX_EDID  512
 156
 157 static int omap_connector_get_modes(struct drm_connector *connector)
 158 {
 159         struct omap_connector *omap_connector = to_omap_connector(connector);
 160         struct omap_dss_device *dssdev = omap_connector->dssdev;
 161         struct omap_dss_driver *dssdrv = dssdev->driver;
 162         struct drm_device *dev = connector->dev;
 163         int n = 0;
 164
 165         DBG("%s", omap_connector->dssdev->name);
 166
 167         /* if display exposes EDID, then we parse that in the normal way to
 168          * build table of supported modes.. otherwise (ie. fixed resolution
 169          * LCD panels) we just return a single mode corresponding to the
 170          * currently configured timings:
 171          */
 172         if (dssdrv->read_edid) {
 173                 void *edid = kzalloc(MAX_EDID, GFP_KERNEL);
 174
 175                 if ((dssdrv->read_edid(dssdev, edid, MAX_EDID) > 0) &&
 176                                 drm_edid_is_valid(edid)) {
 177                         drm_mode_connector_update_edid_property(
 178                                         connector, edid);
 179                         n = drm_add_edid_modes(connector, edid);
 180                         kfree(connector->display_info.raw_edid);
 181                         connector->display_info.raw_edid = edid;
 182                 } else {
 183                         drm_mode_connector_update_edid_property(
 184                                         connector, NULL);
 185                         connector->display_info.raw_edid = NULL;
 186                         kfree(edid);
 187                 }
 188         } else {
 189                 struct drm_display_mode *mode = drm_mode_create(dev);
 190                 struct omap_video_timings timings;
 191
 192                 dssdrv->get_timings(dssdev, &timings);
 193
 194                 copy_timings_omap_to_drm(mode, &timings);
 195
 196                 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
 197                 drm_mode_set_name(mode);
 198                 drm_mode_probed_add(connector, mode);
 199
 200                 n = 1;
 201         }
 202
 203         return n;
 204 }
 205
 206 static int omap_connector_mode_valid(struct drm_connector *connector,
 207                                  struct drm_display_mode *mode)
 208 {
 209         struct omap_connector *omap_connector = to_omap_connector(connector);
 210         struct omap_dss_device *dssdev = omap_connector->dssdev;
 211         struct omap_dss_driver *dssdrv = dssdev->driver;
 212         struct omap_video_timings timings = {0};
 213         struct drm_device *dev = connector->dev;
 214         struct drm_display_mode *new_mode;
 215         int ret = MODE_BAD;
 216
 217         copy_timings_drm_to_omap(&timings, mode);
 218         mode->vrefresh = drm_mode_vrefresh(mode);
 219
 220         if (!dssdrv->check_timings(dssdev, &timings)) {
 221                 /* check if vrefresh is still valid */
 222                 new_mode = drm_mode_duplicate(dev, mode);
 223                 new_mode->clock = timings.pixel_clock;
 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
 242 struct drm_encoder *omap_connector_attached_encoder(
 243                 struct drm_connector *connector)
 244 {
 245         int i;
 246         struct omap_connector *omap_connector = to_omap_connector(connector);
 247
 248         for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++) {
 249                 struct drm_mode_object *obj;
 250
 251                 if (connector->encoder_ids[i] == 0)
 252                         break;
 253
 254                 obj = drm_mode_object_find(connector->dev,
 255                                 connector->encoder_ids[i],
 256                                 DRM_MODE_OBJECT_ENCODER);
 257
 258                 if (obj) {
 259                         struct drm_encoder *encoder = obj_to_encoder(obj);
 260                         struct omap_overlay_manager *mgr =
 261                                         omap_encoder_get_manager(encoder);
 262                         DBG("%s: found %s", omap_connector->dssdev->name,
 263                                         mgr->name);
 264                         return encoder;
 265                 }
 266         }
 267
 268         DBG("%s: no encoder", omap_connector->dssdev->name);
 269
 270         return NULL;
 271 }
 272
 273 static const struct drm_connector_funcs omap_connector_funcs = {
 274         .dpms = omap_connector_dpms,
 275         .detect = omap_connector_detect,
 276         .fill_modes = drm_helper_probe_single_connector_modes,
 277         .destroy = omap_connector_destroy,
 278 };
 279
 280 static const struct drm_connector_helper_funcs omap_connector_helper_funcs = {
 281         .get_modes = omap_connector_get_modes,
 282         .mode_valid = omap_connector_mode_valid,
 283         .best_encoder = omap_connector_attached_encoder,
 284 };
 285
 286 /* called from encoder when mode is set, to propagate settings to the dssdev */
 287 void omap_connector_mode_set(struct drm_connector *connector,
 288                 struct drm_display_mode *mode)
 289 {
 290         struct drm_device *dev = connector->dev;
 291         struct omap_connector *omap_connector = to_omap_connector(connector);
 292         struct omap_dss_device *dssdev = omap_connector->dssdev;
 293         struct omap_dss_driver *dssdrv = dssdev->driver;
 294         struct omap_video_timings timings;
 295
 296         copy_timings_drm_to_omap(&timings, mode);
 297
 298         DBG("%s: set mode: %d:\"%s\" %d %d %d %d %d %d %d %d %d %d 0x%x 0x%x",
 299                         omap_connector->dssdev->name,
 300                         mode->base.id, mode->name, mode->vrefresh, mode->clock,
 301                         mode->hdisplay, mode->hsync_start,
 302                         mode->hsync_end, mode->htotal,
 303                         mode->vdisplay, mode->vsync_start,
 304                         mode->vsync_end, mode->vtotal, mode->type, mode->flags);
 305
 306         if (dssdrv->check_timings(dssdev, &timings)) {
 307                 dev_err(dev->dev, "could not set timings\n");
 308                 return;
 309         }
 310
 311         dssdrv->set_timings(dssdev, &timings);
 312 }
 313
 314 /* flush an area of the framebuffer (in case of manual update display that
 315  * is not automatically flushed)
 316  */
 317 void omap_connector_flush(struct drm_connector *connector,
 318                 int x, int y, int w, int h)
 319 {
 320         struct omap_connector *omap_connector = to_omap_connector(connector);
 321
 322         /* TODO: enable when supported in dss */
 323         VERB("%s: %d,%d, %dx%d", omap_connector->dssdev->name, x, y, w, h);
 324 }
 325
 326 /* initialize connector */
 327 struct drm_connector *omap_connector_init(struct drm_device *dev,
 328                 int connector_type, struct omap_dss_device *dssdev)
 329 {
 330         struct drm_connector *connector = NULL;
 331         struct omap_connector *omap_connector;
 332
 333         DBG("%s", dssdev->name);
 334
 335         omap_dss_get_device(dssdev);
 336
 337         omap_connector = kzalloc(sizeof(struct omap_connector), GFP_KERNEL);
 338         if (!omap_connector) {
 339                 dev_err(dev->dev, "could not allocate connector\n");
 340                 goto fail;
 341         }
 342
 343         omap_connector->dssdev = dssdev;
 344         connector = &omap_connector->base;
 345
 346         drm_connector_init(dev, connector, &omap_connector_funcs,
 347                                 connector_type);
 348         drm_connector_helper_add(connector, &omap_connector_helper_funcs);
 349
 350 #if 0 /* enable when dss2 supports hotplug */
 351         if (dssdev->caps & OMAP_DSS_DISPLAY_CAP_HPD)
 352                 connector->polled = 0;
 353         else
 354 #endif
 355                 connector->polled = DRM_CONNECTOR_POLL_CONNECT |
 356                                 DRM_CONNECTOR_POLL_DISCONNECT;
 357
 358         connector->interlace_allowed = 1;
 359         connector->doublescan_allowed = 0;
 360
 361         drm_sysfs_connector_add(connector);
 362
 363         return connector;
 364
 365 fail:
 366         if (connector) {
 367                 omap_connector_destroy(connector);
 368         }
 369
 370         return NULL;
 371 }