kernel/drivers/gpu/drm/omapdrm/omap_connector.c

   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
  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
  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
  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
 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
 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
 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
 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
 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 */
 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 }