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 <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
  32 struct omap_connector {
  33         struct drm_connector base;
  34         struct omap_dss_device *dssdev;
  35         bool hdmi_mode;
  36 };
  37
  38 static void omap_connector_hpd_cb(void *cb_data,
  39                                   enum drm_connector_status status)
  40 {
  41         struct omap_connector *omap_connector = cb_data;
  42         struct drm_connector *connector = &omap_connector->base;
  43         struct drm_device *dev = connector->dev;
  44         enum drm_connector_status old_status;
  45
  46         mutex_lock(&dev->mode_config.mutex);
  47         old_status = connector->status;
  48         connector->status = status;
  49         mutex_unlock(&dev->mode_config.mutex);
  50
  51         if (old_status != status)
  52                 drm_kms_helper_hotplug_event(dev);
  53 }
  54
  55 bool omap_connector_get_hdmi_mode(struct drm_connector *connector)
  56 {
  57         struct omap_connector *omap_connector = to_omap_connector(connector);
  58
  59         return omap_connector->hdmi_mode;
  60 }
  61
  62 static enum drm_connector_status omap_connector_detect(
  63                 struct drm_connector *connector, bool force)
  64 {
  65         struct omap_connector *omap_connector = to_omap_connector(connector);
  66         struct omap_dss_device *dssdev = omap_connector->dssdev;
  67         struct omap_dss_driver *dssdrv = dssdev->driver;
  68         enum drm_connector_status ret;
  69
  70         if (dssdrv->detect) {
  71                 if (dssdrv->detect(dssdev))
  72                         ret = connector_status_connected;
  73                 else
  74                         ret = connector_status_disconnected;
  75         } else if (dssdev->type == OMAP_DISPLAY_TYPE_DPI ||
  76                         dssdev->type == OMAP_DISPLAY_TYPE_DBI ||
  77                         dssdev->type == OMAP_DISPLAY_TYPE_SDI ||
  78                         dssdev->type == OMAP_DISPLAY_TYPE_DSI) {
  79                 ret = connector_status_connected;
  80         } else {
  81                 ret = connector_status_unknown;
  82         }
  83
  84         VERB("%s: %d (force=%d)", omap_connector->dssdev->name, ret, force);
  85
  86         return ret;
  87 }
  88
  89 static void omap_connector_destroy(struct drm_connector *connector)
  90 {
  91         struct omap_connector *omap_connector = to_omap_connector(connector);
  92         struct omap_dss_device *dssdev = omap_connector->dssdev;
  93
  94         DBG("%s", omap_connector->dssdev->name);
  95         if (connector->polled == DRM_CONNECTOR_POLL_HPD &&
  96             dssdev->driver->unregister_hpd_cb) {
  97                 dssdev->driver->unregister_hpd_cb(dssdev);
  98         }
  99         drm_connector_unregister(connector);
 100         drm_connector_cleanup(connector);
 101         kfree(omap_connector);
 102
 103         omap_dss_put_device(dssdev);
 104 }
 105
 106 #define MAX_EDID  512
 107
 108 static int omap_connector_get_modes(struct drm_connector *connector)
 109 {
 110         struct omap_connector *omap_connector = to_omap_connector(connector);
 111         struct omap_dss_device *dssdev = omap_connector->dssdev;
 112         struct omap_dss_driver *dssdrv = dssdev->driver;
 113         struct drm_device *dev = connector->dev;
 114         int n = 0;
 115
 116         DBG("%s", omap_connector->dssdev->name);
 117
 118         /* if display exposes EDID, then we parse that in the normal way to
 119          * build table of supported modes.. otherwise (ie. fixed resolution
 120          * LCD panels) we just return a single mode corresponding to the
 121          * currently configured timings:
 122          */
 123         if (dssdrv->read_edid) {
 124                 void *edid = kzalloc(MAX_EDID, GFP_KERNEL);
 125
 126                 if (!edid)
 127                         return 0;
 128
 129                 if ((dssdrv->read_edid(dssdev, edid, MAX_EDID) > 0) &&
 130                                 drm_edid_is_valid(edid)) {
 131                         drm_mode_connector_update_edid_property(
 132                                         connector, edid);
 133                         n = drm_add_edid_modes(connector, edid);
 134
 135                         omap_connector->hdmi_mode =
 136                                 drm_detect_hdmi_monitor(edid);
 137                 } else {
 138                         drm_mode_connector_update_edid_property(
 139                                         connector, NULL);
 140                 }
 141
 142                 kfree(edid);
 143         } else {
 144                 struct drm_display_mode *mode = drm_mode_create(dev);
 145                 struct videomode vm = {0};
 146
 147                 if (!mode)
 148                         return 0;
 149
 150                 dssdrv->get_timings(dssdev, &vm);
 151
 152                 drm_display_mode_from_videomode(&vm, mode);
 153
 154                 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
 155                 drm_mode_set_name(mode);
 156                 drm_mode_probed_add(connector, mode);
 157
 158                 n = 1;
 159         }
 160
 161         return n;
 162 }
 163
 164 static int omap_connector_mode_valid(struct drm_connector *connector,
 165                                  struct drm_display_mode *mode)
 166 {
 167         struct omap_connector *omap_connector = to_omap_connector(connector);
 168         struct omap_dss_device *dssdev = omap_connector->dssdev;
 169         struct omap_dss_driver *dssdrv = dssdev->driver;
 170         struct videomode vm = {0};
 171         struct drm_device *dev = connector->dev;
 172         struct drm_display_mode *new_mode;
 173         int r, ret = MODE_BAD;
 174
 175         drm_display_mode_to_videomode(mode, &vm);
 176         mode->vrefresh = drm_mode_vrefresh(mode);
 177
 178         /*
 179          * if the panel driver doesn't have a check_timings, it's most likely
 180          * a fixed resolution panel, check if the timings match with the
 181          * panel's timings
 182          */
 183         if (dssdrv->check_timings) {
 184                 r = dssdrv->check_timings(dssdev, &vm);
 185         } else {
 186                 struct videomode t = {0};
 187
 188                 dssdrv->get_timings(dssdev, &t);
 189
 190                 /*
 191                  * Ignore the flags, as we don't get them from
 192                  * drm_display_mode_to_videomode.
 193                  */
 194                 t.flags = 0;
 195
 196                 if (memcmp(&vm, &t, sizeof(vm)))
 197                         r = -EINVAL;
 198                 else
 199                         r = 0;
 200         }
 201
 202         if (!r) {
 203                 /* check if vrefresh is still valid */
 204                 new_mode = drm_mode_duplicate(dev, mode);
 205
 206                 if (!new_mode)
 207                         return MODE_BAD;
 208
 209                 new_mode->clock = vm.pixelclock / 1000;
 210                 new_mode->vrefresh = 0;
 211                 if (mode->vrefresh == drm_mode_vrefresh(new_mode))
 212                         ret = MODE_OK;
 213                 drm_mode_destroy(dev, new_mode);
 214         }
 215
 216         DBG("connector: mode %s: "
 217                         "%d:\"%s\" %d %d %d %d %d %d %d %d %d %d 0x%x 0x%x",
 218                         (ret == MODE_OK) ? "valid" : "invalid",
 219                         mode->base.id, mode->name, mode->vrefresh, mode->clock,
 220                         mode->hdisplay, mode->hsync_start,
 221                         mode->hsync_end, mode->htotal,
 222                         mode->vdisplay, mode->vsync_start,
 223                         mode->vsync_end, mode->vtotal, mode->type, mode->flags);
 224
 225         return ret;
 226 }
 227
 228 static const struct drm_connector_funcs omap_connector_funcs = {
 229         .reset = drm_atomic_helper_connector_reset,
 230         .detect = omap_connector_detect,
 231         .fill_modes = drm_helper_probe_single_connector_modes,
 232         .destroy = omap_connector_destroy,
 233         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 234         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 235 };
 236
 237 static const struct drm_connector_helper_funcs omap_connector_helper_funcs = {
 238         .get_modes = omap_connector_get_modes,
 239         .mode_valid = omap_connector_mode_valid,
 240 };
 241
 242 /* initialize connector */
 243 struct drm_connector *omap_connector_init(struct drm_device *dev,
 244                 int connector_type, struct omap_dss_device *dssdev,
 245                 struct drm_encoder *encoder)
 246 {
 247         struct drm_connector *connector = NULL;
 248         struct omap_connector *omap_connector;
 249         bool hpd_supported = false;
 250
 251         DBG("%s", dssdev->name);
 252
 253         omap_dss_get_device(dssdev);
 254
 255         omap_connector = kzalloc(sizeof(*omap_connector), GFP_KERNEL);
 256         if (!omap_connector)
 257                 goto fail;
 258
 259         omap_connector->dssdev = dssdev;
 260
 261         connector = &omap_connector->base;
 262
 263         drm_connector_init(dev, connector, &omap_connector_funcs,
 264                                 connector_type);
 265         drm_connector_helper_add(connector, &omap_connector_helper_funcs);
 266
 267         if (dssdev->driver->register_hpd_cb) {
 268                 int ret = dssdev->driver->register_hpd_cb(dssdev,
 269                                                           omap_connector_hpd_cb,
 270                                                           omap_connector);
 271                 if (!ret)
 272                         hpd_supported = true;
 273                 else if (ret != -ENOTSUPP)
 274                         DBG("%s: Failed to register HPD callback (%d).",
 275                             dssdev->name, ret);
 276         }
 277
 278         if (hpd_supported)
 279                 connector->polled = DRM_CONNECTOR_POLL_HPD;
 280         else if (dssdev->driver->detect)
 281                 connector->polled = DRM_CONNECTOR_POLL_CONNECT |
 282                                     DRM_CONNECTOR_POLL_DISCONNECT;
 283         else
 284                 connector->polled = 0;
 285
 286         connector->interlace_allowed = 1;
 287         connector->doublescan_allowed = 0;
 288
 289         return connector;
 290
 291 fail:
 292         if (connector)
 293                 omap_connector_destroy(connector);
 294
 295         return NULL;
 296 }