LXR linux/drivers/gpu/drm/omapdrm/omap

   1/*
   2 * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
   3 * Author: Rob Clark <rob@ti.com>
   4 *
   5 * This program is free software; you can redistribute it and/or modify it
   6 * under the terms of the GNU General Public License version 2 as published by
   7 * the Free Software Foundation.
   8 *
   9 * This program is distributed in the hope that it will be useful, but WITHOUT
  10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12 * more details.
  13 *
  14 * You should have received a copy of the GNU General Public License along with
  15 * this program.  If not, see <http://www.gnu.org/licenses/>.
  16 */
  17
  18#include <drm/drm_atomic_helper.h>
  19#include <drm/drm_crtc.h>
  20#include <drm/drm_crtc_helper.h>
  21
  22#include "omap_drv.h"
  23
  24/*
  25 * connector funcs
  26 */
  27
  28#define to_omap_connector(x) container_of(x, struct omap_connector, base)
  29
  30struct omap_connector {
  31        struct drm_connector base;
  32        struct omap_dss_device *dssdev;
  33        bool hdmi_mode;
  34};
  35
  36static void omap_connector_hpd_cb(void *cb_data,
  37                                  enum drm_connector_status status)
  38{
  39        struct omap_connector *omap_connector = cb_data;
  40        struct drm_connector *connector = &omap_connector->base;
  41        struct drm_device *dev = connector->dev;
  42        enum drm_connector_status old_status;
  43
  44        mutex_lock(&dev->mode_config.mutex);
  45        old_status = connector->status;
  46        connector->status = status;
  47        mutex_unlock(&dev->mode_config.mutex);
  48
  49        if (old_status != status)
  50                drm_kms_helper_hotplug_event(dev);
  51}
  52
  53bool omap_connector_get_hdmi_mode(struct drm_connector *connector)
  54{
  55        struct omap_connector *omap_connector = to_omap_connector(connector);
  56
  57        return omap_connector->hdmi_mode;
  58}
  59
  60static enum drm_connector_status omap_connector_detect(
  61                struct drm_connector *connector, bool force)
  62{
  63        struct omap_connector *omap_connector = to_omap_connector(connector);
  64        struct omap_dss_device *dssdev = omap_connector->dssdev;
  65        struct omap_dss_driver *dssdrv = dssdev->driver;
  66        enum drm_connector_status ret;
  67
  68        if (dssdrv->detect) {
  69                if (dssdrv->detect(dssdev))
  70                        ret = connector_status_connected;
  71                else
  72                        ret = connector_status_disconnected;
  73        } else if (dssdev->type == OMAP_DISPLAY_TYPE_DPI ||
  74                        dssdev->type == OMAP_DISPLAY_TYPE_DBI ||
  75                        dssdev->type == OMAP_DISPLAY_TYPE_SDI ||
  76                        dssdev->type == OMAP_DISPLAY_TYPE_DSI) {
  77                ret = connector_status_connected;
  78        } else {
  79                ret = connector_status_unknown;
  80        }
  81
  82        VERB("%s: %d (force=%d)", omap_connector->dssdev->name, ret, force);
  83
  84        return ret;
  85}
  86
  87static void omap_connector_destroy(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
  92        DBG("%s", omap_connector->dssdev->name);
  93        if (connector->polled == DRM_CONNECTOR_POLL_HPD &&
  94            dssdev->driver->unregister_hpd_cb) {
  95                dssdev->driver->unregister_hpd_cb(dssdev);
  96        }
  97        drm_connector_unregister(connector);
  98        drm_connector_cleanup(connector);
  99        kfree(omap_connector);
 100
 101        omap_dss_put_device(dssdev);
 102}
 103
 104#define MAX_EDID  512
 105
 106static int omap_connector_get_modes(struct drm_connector *connector)
 107{
 108        struct omap_connector *omap_connector = to_omap_connector(connector);
 109        struct omap_dss_device *dssdev = omap_connector->dssdev;
 110        struct omap_dss_driver *dssdrv = dssdev->driver;
 111        struct drm_device *dev = connector->dev;
 112        int n = 0;
 113
 114        DBG("%s", omap_connector->dssdev->name);
 115
 116        /* if display exposes EDID, then we parse that in the normal way to
 117         * build table of supported modes.. otherwise (ie. fixed resolution
 118         * LCD panels) we just return a single mode corresponding to the
 119         * currently configured timings:
 120         */
 121        if (dssdrv->read_edid) {
 122                void *edid = kzalloc(MAX_EDID, GFP_KERNEL);
 123
 124                if (!edid)
 125                        return 0;
 126
 127                if ((dssdrv->read_edid(dssdev, edid, MAX_EDID) > 0) &&
 128                                drm_edid_is_valid(edid)) {
 129                        drm_mode_connector_update_edid_property(
 130                                        connector, edid);
 131                        n = drm_add_edid_modes(connector, edid);
 132
 133                        omap_connector->hdmi_mode =
 134                                drm_detect_hdmi_monitor(edid);
 135                } else {
 136                        drm_mode_connector_update_edid_property(
 137                                        connector, NULL);
 138                }
 139
 140                kfree(edid);
 141        } else {
 142                struct drm_display_mode *mode = drm_mode_create(dev);
 143                struct videomode vm = {0};
 144
 145                if (!mode)
 146                        return 0;
 147
 148                dssdrv->get_timings(dssdev, &vm);
 149
 150                drm_display_mode_from_videomode(&vm, mode);
 151
 152                mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
 153                drm_mode_set_name(mode);
 154                drm_mode_probed_add(connector, mode);
 155
 156                if (dssdrv->get_size) {
 157                        dssdrv->get_size(dssdev,
 158                                         &connector->display_info.width_mm,
 159                                         &connector->display_info.height_mm);
 160                }
 161
 162                n = 1;
 163        }
 164
 165        return n;
 166}
 167
 168static int omap_connector_mode_valid(struct drm_connector *connector,
 169                                 struct drm_display_mode *mode)
 170{
 171        struct omap_connector *omap_connector = to_omap_connector(connector);
 172        struct omap_dss_device *dssdev = omap_connector->dssdev;
 173        struct omap_dss_driver *dssdrv = dssdev->driver;
 174        struct videomode vm = {0};
 175        struct drm_device *dev = connector->dev;
 176        struct drm_display_mode *new_mode;
 177        int r, ret = MODE_BAD;
 178
 179        drm_display_mode_to_videomode(mode, &vm);
 180        mode->vrefresh = drm_mode_vrefresh(mode);
 181
 182        /*
 183         * if the panel driver doesn't have a check_timings, it's most likely
 184         * a fixed resolution panel, check if the timings match with the
 185         * panel's timings
 186         */
 187        if (dssdrv->check_timings) {
 188                r = dssdrv->check_timings(dssdev, &vm);
 189        } else {
 190                struct videomode t = {0};
 191
 192                dssdrv->get_timings(dssdev, &t);
 193
 194                /*
 195                 * Ignore the flags, as we don't get them from
 196                 * drm_display_mode_to_videomode.
 197                 */
 198                t.flags = 0;
 199
 200                if (memcmp(&vm, &t, sizeof(vm)))
 201                        r = -EINVAL;
 202                else
 203                        r = 0;
 204        }
 205
 206        if (!r) {
 207                /* check if vrefresh is still valid */
 208                new_mode = drm_mode_duplicate(dev, mode);
 209
 210                if (!new_mode)
 211                        return MODE_BAD;
 212
 213                new_mode->clock = vm.pixelclock / 1000;
 214                new_mode->vrefresh = 0;
 215                if (mode->vrefresh == drm_mode_vrefresh(new_mode))
 216                        ret = MODE_OK;
 217                drm_mode_destroy(dev, new_mode);
 218        }
 219
 220        DBG("connector: mode %s: "
 221                        "%d:\"%s\" %d %d %d %d %d %d %d %d %d %d 0x%x 0x%x",
 222                        (ret == MODE_OK) ? "valid" : "invalid",
 223                        mode->base.id, mode->name, mode->vrefresh, mode->clock,
 224                        mode->hdisplay, mode->hsync_start,
 225                        mode->hsync_end, mode->htotal,
 226                        mode->vdisplay, mode->vsync_start,
 227                        mode->vsync_end, mode->vtotal, mode->type, mode->flags);
 228
 229        return ret;
 230}
 231
 232static const struct drm_connector_funcs omap_connector_funcs = {
 233        .reset = drm_atomic_helper_connector_reset,
 234        .detect = omap_connector_detect,
 235        .fill_modes = drm_helper_probe_single_connector_modes,
 236        .destroy = omap_connector_destroy,
 237        .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 238        .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 239};
 240
 241static const struct drm_connector_helper_funcs omap_connector_helper_funcs = {
 242        .get_modes = omap_connector_get_modes,
 243        .mode_valid = omap_connector_mode_valid,
 244};
 245
 246/* initialize connector */
 247struct drm_connector *omap_connector_init(struct drm_device *dev,
 248                int connector_type, struct omap_dss_device *dssdev,
 249                struct drm_encoder *encoder)
 250{
 251        struct drm_connector *connector = NULL;
 252        struct omap_connector *omap_connector;
 253        bool hpd_supported = false;
 254
 255        DBG("%s", dssdev->name);
 256
 257        omap_dss_get_device(dssdev);
 258
 259        omap_connector = kzalloc(sizeof(*omap_connector), GFP_KERNEL);
 260        if (!omap_connector)
 261                goto fail;
 262
 263        omap_connector->dssdev = dssdev;
 264
 265        connector = &omap_connector->base;
 266
 267        drm_connector_init(dev, connector, &omap_connector_funcs,
 268                                connector_type);
 269        drm_connector_helper_add(connector, &omap_connector_helper_funcs);
 270
 271        if (dssdev->driver->register_hpd_cb) {
 272                int ret = dssdev->driver->register_hpd_cb(dssdev,
 273                                                          omap_connector_hpd_cb,
 274                                                          omap_connector);
 275                if (!ret)
 276                        hpd_supported = true;
 277                else if (ret != -ENOTSUPP)
 278                        DBG("%s: Failed to register HPD callback (%d).",
 279                            dssdev->name, ret);
 280        }
 281
 282        if (hpd_supported)
 283                connector->polled = DRM_CONNECTOR_POLL_HPD;
 284        else if (dssdev->driver->detect)
 285                connector->polled = DRM_CONNECTOR_POLL_CONNECT |
 286                                    DRM_CONNECTOR_POLL_DISCONNECT;
 287        else
 288                connector->polled = 0;
 289
 290        connector->interlace_allowed = 1;
 291        connector->doublescan_allowed = 0;
 292
 293        return connector;
 294
 295fail:
 296        if (connector)
 297                omap_connector_destroy(connector);
 298
 299        return NULL;
 300}
 301