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 <[email protected]>
   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 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 static enum drm_connector_status omap_connector_detect(
  46                 struct drm_connector *connector, bool force)
  47 {
  48         struct omap_connector *omap_connector = to_omap_connector(connector);
  49         struct omap_dss_device *dssdev = omap_connector->dssdev;
  50         struct omap_dss_driver *dssdrv = dssdev->driver;
  51         enum drm_connector_status ret;
  52
  53         if (dssdrv->detect) {
  54                 if (dssdrv->detect(dssdev))
  55                         ret = connector_status_connected;
  56                 else
  57                         ret = connector_status_disconnected;
  58         } else if (dssdev->type == OMAP_DISPLAY_TYPE_DPI ||
  59                         dssdev->type == OMAP_DISPLAY_TYPE_DBI ||
  60                         dssdev->type == OMAP_DISPLAY_TYPE_SDI ||
  61                         dssdev->type == OMAP_DISPLAY_TYPE_DSI) {
  62                 ret = connector_status_connected;
  63         } else {
  64                 ret = connector_status_unknown;
  65         }
  66
  67         VERB("%s: %d (force=%d)", omap_connector->dssdev->name, ret, force);
  68
  69         return ret;
  70 }
  71
  72 static void omap_connector_destroy(struct drm_connector *connector)
  73 {
  74         struct omap_connector *omap_connector = to_omap_connector(connector);
  75         struct omap_dss_device *dssdev = omap_connector->dssdev;
  76
  77         DBG("%s", omap_connector->dssdev->name);
  78         drm_connector_unregister(connector);
  79         drm_connector_cleanup(connector);
  80         kfree(omap_connector);
  81
  82         omap_dss_put_device(dssdev);
  83 }
  84
  85 #define MAX_EDID  512
  86
  87 static int omap_connector_get_modes(struct drm_connector *connector)
  88 {
  89         struct omap_connector *omap_connector = to_omap_connector(connector);
  90         struct omap_dss_device *dssdev = omap_connector->dssdev;
  91         struct omap_dss_driver *dssdrv = dssdev->driver;
  92         struct drm_device *dev = connector->dev;
  93         int n = 0;
  94
  95         DBG("%s", omap_connector->dssdev->name);
  96
  97         /* if display exposes EDID, then we parse that in the normal way to
  98          * build table of supported modes.. otherwise (ie. fixed resolution
  99          * LCD panels) we just return a single mode corresponding to the
 100          * currently configured timings:
 101          */
 102         if (dssdrv->read_edid) {
 103                 void *edid = kzalloc(MAX_EDID, GFP_KERNEL);
 104
 105                 if ((dssdrv->read_edid(dssdev, edid, MAX_EDID) > 0) &&
 106                                 drm_edid_is_valid(edid)) {
 107                         drm_mode_connector_update_edid_property(
 108                                         connector, edid);
 109                         n = drm_add_edid_modes(connector, edid);
 110
 111                         omap_connector->hdmi_mode =
 112                                 drm_detect_hdmi_monitor(edid);
 113                 } else {
 114                         drm_mode_connector_update_edid_property(
 115                                         connector, NULL);
 116                 }
 117
 118                 kfree(edid);
 119         } else {
 120                 struct drm_display_mode *mode = drm_mode_create(dev);
 121                 struct videomode vm = {0};
 122
 123                 dssdrv->get_timings(dssdev, &vm);
 124
 125                 drm_display_mode_from_videomode(&vm, mode);
 126
 127                 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
 128                 drm_mode_set_name(mode);
 129                 drm_mode_probed_add(connector, mode);
 130
 131                 n = 1;
 132         }
 133
 134         return n;
 135 }
 136
 137 static int omap_connector_mode_valid(struct drm_connector *connector,
 138                                  struct drm_display_mode *mode)
 139 {
 140         struct omap_connector *omap_connector = to_omap_connector(connector);
 141         struct omap_dss_device *dssdev = omap_connector->dssdev;
 142         struct omap_dss_driver *dssdrv = dssdev->driver;
 143         struct videomode vm = {0};
 144         struct drm_device *dev = connector->dev;
 145         struct drm_display_mode *new_mode;
 146         int r, ret = MODE_BAD;
 147
 148         drm_display_mode_to_videomode(mode, &vm);
 149         vm.flags |= DISPLAY_FLAGS_DE_HIGH | DISPLAY_FLAGS_PIXDATA_POSEDGE |
 150                     DISPLAY_FLAGS_SYNC_NEGEDGE;
 151         mode->vrefresh = drm_mode_vrefresh(mode);
 152
 153         /*
 154          * if the panel driver doesn't have a check_timings, it's most likely
 155          * a fixed resolution panel, check if the timings match with the
 156          * panel's timings
 157          */
 158         if (dssdrv->check_timings) {
 159                 r = dssdrv->check_timings(dssdev, &vm);
 160         } else {
 161                 struct videomode t = {0};
 162
 163                 dssdrv->get_timings(dssdev, &t);
 164
 165                 if (memcmp(&vm, &t, sizeof(struct videomode)))
 166                         r = -EINVAL;
 167                 else
 168                         r = 0;
 169         }
 170
 171         if (!r) {
 172                 /* check if vrefresh is still valid */
 173                 new_mode = drm_mode_duplicate(dev, mode);
 174                 new_mode->clock = vm.pixelclock / 1000;
 175                 new_mode->vrefresh = 0;
 176                 if (mode->vrefresh == drm_mode_vrefresh(new_mode))
 177                         ret = MODE_OK;
 178                 drm_mode_destroy(dev, new_mode);
 179         }
 180
 181         DBG("connector: mode %s: "
 182                         "%d:\"%s\" %d %d %d %d %d %d %d %d %d %d 0x%x 0x%x",
 183                         (ret == MODE_OK) ? "valid" : "invalid",
 184                         mode->base.id, mode->name, mode->vrefresh, mode->clock,
 185                         mode->hdisplay, mode->hsync_start,
 186                         mode->hsync_end, mode->htotal,
 187                         mode->vdisplay, mode->vsync_start,
 188                         mode->vsync_end, mode->vtotal, mode->type, mode->flags);
 189
 190         return ret;
 191 }
 192
 193 static const struct drm_connector_funcs omap_connector_funcs = {
 194         .dpms = drm_atomic_helper_connector_dpms,
 195         .reset = drm_atomic_helper_connector_reset,
 196         .detect = omap_connector_detect,
 197         .fill_modes = drm_helper_probe_single_connector_modes,
 198         .destroy = omap_connector_destroy,
 199         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 200         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 201 };
 202
 203 static const struct drm_connector_helper_funcs omap_connector_helper_funcs = {
 204         .get_modes = omap_connector_get_modes,
 205         .mode_valid = omap_connector_mode_valid,
 206 };
 207
 208 /* initialize connector */
 209 struct drm_connector *omap_connector_init(struct drm_device *dev,
 210                 int connector_type, struct omap_dss_device *dssdev,
 211                 struct drm_encoder *encoder)
 212 {
 213         struct drm_connector *connector = NULL;
 214         struct omap_connector *omap_connector;
 215
 216         DBG("%s", dssdev->name);
 217
 218         omap_dss_get_device(dssdev);
 219
 220         omap_connector = kzalloc(sizeof(struct omap_connector), GFP_KERNEL);
 221         if (!omap_connector)
 222                 goto fail;
 223
 224         omap_connector->dssdev = dssdev;
 225
 226         connector = &omap_connector->base;
 227
 228         drm_connector_init(dev, connector, &omap_connector_funcs,
 229                                 connector_type);
 230         drm_connector_helper_add(connector, &omap_connector_helper_funcs);
 231
 232 #if 0 /* enable when dss2 supports hotplug */
 233         if (dssdev->caps & OMAP_DSS_DISPLAY_CAP_HPD)
 234                 connector->polled = 0;
 235         else
 236 #endif
 237                 connector->polled = DRM_CONNECTOR_POLL_CONNECT |
 238                                 DRM_CONNECTOR_POLL_DISCONNECT;
 239
 240         connector->interlace_allowed = 1;
 241         connector->doublescan_allowed = 0;
 242
 243         drm_connector_register(connector);
 244
 245         return connector;
 246
 247 fail:
 248         if (connector)
 249                 omap_connector_destroy(connector);
 250
 251         return NULL;
 252 }