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 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->hactive;
  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->vactive;
  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->double_pixel)
  66                 mode->flags |= DRM_MODE_FLAG_DBLCLK;
  67
  68         if (timings->hsync_level == OMAPDSS_SIG_ACTIVE_HIGH)
  69                 mode->flags |= DRM_MODE_FLAG_PHSYNC;
  70         else
  71                 mode->flags |= DRM_MODE_FLAG_NHSYNC;
  72
  73         if (timings->vsync_level == OMAPDSS_SIG_ACTIVE_HIGH)
  74                 mode->flags |= DRM_MODE_FLAG_PVSYNC;
  75         else
  76                 mode->flags |= DRM_MODE_FLAG_NVSYNC;
  77 }
  78
  79 void copy_timings_drm_to_omap(struct omap_video_timings *timings,
  80                 struct drm_display_mode *mode)
  81 {
  82         timings->pixelclock = mode->clock * 1000;
  83
  84         timings->hactive = mode->hdisplay;
  85         timings->hfp = mode->hsync_start - mode->hdisplay;
  86         timings->hsw = mode->hsync_end - mode->hsync_start;
  87         timings->hbp = mode->htotal - mode->hsync_end;
  88
  89         timings->vactive = mode->vdisplay;
  90         timings->vfp = mode->vsync_start - mode->vdisplay;
  91         timings->vsw = mode->vsync_end - mode->vsync_start;
  92         timings->vbp = mode->vtotal - mode->vsync_end;
  93
  94         timings->interlace = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
  95         timings->double_pixel = !!(mode->flags & DRM_MODE_FLAG_DBLCLK);
  96
  97         if (mode->flags & DRM_MODE_FLAG_PHSYNC)
  98                 timings->hsync_level = OMAPDSS_SIG_ACTIVE_HIGH;
  99         else
 100                 timings->hsync_level = OMAPDSS_SIG_ACTIVE_LOW;
 101
 102         if (mode->flags & DRM_MODE_FLAG_PVSYNC)
 103                 timings->vsync_level = OMAPDSS_SIG_ACTIVE_HIGH;
 104         else
 105                 timings->vsync_level = OMAPDSS_SIG_ACTIVE_LOW;
 106
 107         timings->data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE;
 108         timings->de_level = OMAPDSS_SIG_ACTIVE_HIGH;
 109         timings->sync_pclk_edge = OMAPDSS_DRIVE_SIG_FALLING_EDGE;
 110 }
 111
 112 static enum drm_connector_status omap_connector_detect(
 113                 struct drm_connector *connector, bool force)
 114 {
 115         struct omap_connector *omap_connector = to_omap_connector(connector);
 116         struct omap_dss_device *dssdev = omap_connector->dssdev;
 117         struct omap_dss_driver *dssdrv = dssdev->driver;
 118         enum drm_connector_status ret;
 119
 120         if (dssdrv->detect) {
 121                 if (dssdrv->detect(dssdev))
 122                         ret = connector_status_connected;
 123                 else
 124                         ret = connector_status_disconnected;
 125         } else if (dssdev->type == OMAP_DISPLAY_TYPE_DPI ||
 126                         dssdev->type == OMAP_DISPLAY_TYPE_DBI ||
 127                         dssdev->type == OMAP_DISPLAY_TYPE_SDI ||
 128                         dssdev->type == OMAP_DISPLAY_TYPE_DSI) {
 129                 ret = connector_status_connected;
 130         } else {
 131                 ret = connector_status_unknown;
 132         }
 133
 134         VERB("%s: %d (force=%d)", omap_connector->dssdev->name, ret, force);
 135
 136         return ret;
 137 }
 138
 139 static void omap_connector_destroy(struct drm_connector *connector)
 140 {
 141         struct omap_connector *omap_connector = to_omap_connector(connector);
 142         struct omap_dss_device *dssdev = omap_connector->dssdev;
 143
 144         DBG("%s", omap_connector->dssdev->name);
 145         drm_connector_unregister(connector);
 146         drm_connector_cleanup(connector);
 147         kfree(omap_connector);
 148
 149         omap_dss_put_device(dssdev);
 150 }
 151
 152 #define MAX_EDID  512
 153
 154 static int omap_connector_get_modes(struct drm_connector *connector)
 155 {
 156         struct omap_connector *omap_connector = to_omap_connector(connector);
 157         struct omap_dss_device *dssdev = omap_connector->dssdev;
 158         struct omap_dss_driver *dssdrv = dssdev->driver;
 159         struct drm_device *dev = connector->dev;
 160         int n = 0;
 161
 162         DBG("%s", omap_connector->dssdev->name);
 163
 164         /* if display exposes EDID, then we parse that in the normal way to
 165          * build table of supported modes.. otherwise (ie. fixed resolution
 166          * LCD panels) we just return a single mode corresponding to the
 167          * currently configured timings:
 168          */
 169         if (dssdrv->read_edid) {
 170                 void *edid = kzalloc(MAX_EDID, GFP_KERNEL);
 171
 172                 if ((dssdrv->read_edid(dssdev, edid, MAX_EDID) > 0) &&
 173                                 drm_edid_is_valid(edid)) {
 174                         drm_mode_connector_update_edid_property(
 175                                         connector, edid);
 176                         n = drm_add_edid_modes(connector, edid);
 177
 178                         omap_connector->hdmi_mode =
 179                                 drm_detect_hdmi_monitor(edid);
 180                 } else {
 181                         drm_mode_connector_update_edid_property(
 182                                         connector, NULL);
 183                 }
 184
 185                 kfree(edid);
 186         } else {
 187                 struct drm_display_mode *mode = drm_mode_create(dev);
 188                 struct omap_video_timings timings = {0};
 189
 190                 dssdrv->get_timings(dssdev, &timings);
 191
 192                 copy_timings_omap_to_drm(mode, &timings);
 193
 194                 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
 195                 drm_mode_set_name(mode);
 196                 drm_mode_probed_add(connector, mode);
 197
 198                 n = 1;
 199         }
 200
 201         return n;
 202 }
 203
 204 static int omap_connector_mode_valid(struct drm_connector *connector,
 205                                  struct drm_display_mode *mode)
 206 {
 207         struct omap_connector *omap_connector = to_omap_connector(connector);
 208         struct omap_dss_device *dssdev = omap_connector->dssdev;
 209         struct omap_dss_driver *dssdrv = dssdev->driver;
 210         struct omap_video_timings timings = {0};
 211         struct drm_device *dev = connector->dev;
 212         struct drm_display_mode *new_mode;
 213         int r, ret = MODE_BAD;
 214
 215         copy_timings_drm_to_omap(&timings, mode);
 216         mode->vrefresh = drm_mode_vrefresh(mode);
 217
 218         /*
 219          * if the panel driver doesn't have a check_timings, it's most likely
 220          * a fixed resolution panel, check if the timings match with the
 221          * panel's timings
 222          */
 223         if (dssdrv->check_timings) {
 224                 r = dssdrv->check_timings(dssdev, &timings);
 225         } else {
 226                 struct omap_video_timings t = {0};
 227
 228                 dssdrv->get_timings(dssdev, &t);
 229
 230                 if (memcmp(&timings, &t, sizeof(struct omap_video_timings)))
 231                         r = -EINVAL;
 232                 else
 233                         r = 0;
 234         }
 235
 236         if (!r) {
 237                 /* check if vrefresh is still valid */
 238                 new_mode = drm_mode_duplicate(dev, mode);
 239                 new_mode->clock = timings.pixelclock / 1000;
 240                 new_mode->vrefresh = 0;
 241                 if (mode->vrefresh == drm_mode_vrefresh(new_mode))
 242                         ret = MODE_OK;
 243                 drm_mode_destroy(dev, new_mode);
 244         }
 245
 246         DBG("connector: mode %s: "
 247                         "%d:\"%s\" %d %d %d %d %d %d %d %d %d %d 0x%x 0x%x",
 248                         (ret == MODE_OK) ? "valid" : "invalid",
 249                         mode->base.id, mode->name, mode->vrefresh, mode->clock,
 250                         mode->hdisplay, mode->hsync_start,
 251                         mode->hsync_end, mode->htotal,
 252                         mode->vdisplay, mode->vsync_start,
 253                         mode->vsync_end, mode->vtotal, mode->type, mode->flags);
 254
 255         return ret;
 256 }
 257
 258 static const struct drm_connector_funcs omap_connector_funcs = {
 259         .dpms = drm_atomic_helper_connector_dpms,
 260         .reset = drm_atomic_helper_connector_reset,
 261         .detect = omap_connector_detect,
 262         .fill_modes = drm_helper_probe_single_connector_modes,
 263         .destroy = omap_connector_destroy,
 264         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 265         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 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 };
 272
 273 /* initialize connector */
 274 struct drm_connector *omap_connector_init(struct drm_device *dev,
 275                 int connector_type, struct omap_dss_device *dssdev,
 276                 struct drm_encoder *encoder)
 277 {
 278         struct drm_connector *connector = NULL;
 279         struct omap_connector *omap_connector;
 280
 281         DBG("%s", dssdev->name);
 282
 283         omap_dss_get_device(dssdev);
 284
 285         omap_connector = kzalloc(sizeof(struct omap_connector), GFP_KERNEL);
 286         if (!omap_connector)
 287                 goto fail;
 288
 289         omap_connector->dssdev = dssdev;
 290
 291         connector = &omap_connector->base;
 292
 293         drm_connector_init(dev, connector, &omap_connector_funcs,
 294                                 connector_type);
 295         drm_connector_helper_add(connector, &omap_connector_helper_funcs);
 296
 297 #if 0 /* enable when dss2 supports hotplug */
 298         if (dssdev->caps & OMAP_DSS_DISPLAY_CAP_HPD)
 299                 connector->polled = 0;
 300         else
 301 #endif
 302                 connector->polled = DRM_CONNECTOR_POLL_CONNECT |
 303                                 DRM_CONNECTOR_POLL_DISCONNECT;
 304
 305         connector->interlace_allowed = 1;
 306         connector->doublescan_allowed = 0;
 307
 308         drm_connector_register(connector);
 309
 310         return connector;
 311
 312 fail:
 313         if (connector)
 314                 omap_connector_destroy(connector);
 315
 316         return NULL;
 317 }