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->hfront_porch;
  52         mode->hsync_end = mode->hsync_start + timings->hsync_len;
  53         mode->htotal = mode->hsync_end + timings->hback_porch;
  54
  55         mode->vdisplay = timings->vactive;
  56         mode->vsync_start = mode->vdisplay + timings->vfront_porch;
  57         mode->vsync_end = mode->vsync_start + timings->vsync_len;
  58         mode->vtotal = mode->vsync_end + timings->vback_porch;
  59
  60         mode->flags = 0;
  61
  62         if (timings->flags & DISPLAY_FLAGS_INTERLACED)
  63                 mode->flags |= DRM_MODE_FLAG_INTERLACE;
  64
  65         if (timings->flags & DISPLAY_FLAGS_DOUBLECLK)
  66                 mode->flags |= DRM_MODE_FLAG_DBLCLK;
  67
  68         if (timings->flags & DISPLAY_FLAGS_HSYNC_HIGH)
  69                 mode->flags |= DRM_MODE_FLAG_PHSYNC;
  70         else
  71                 mode->flags |= DRM_MODE_FLAG_NHSYNC;
  72
  73         if (timings->flags & DISPLAY_FLAGS_VSYNC_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->hfront_porch = mode->hsync_start - mode->hdisplay;
  86         timings->hsync_len = mode->hsync_end - mode->hsync_start;
  87         timings->hback_porch = mode->htotal - mode->hsync_end;
  88
  89         timings->vactive = mode->vdisplay;
  90         timings->vfront_porch = mode->vsync_start - mode->vdisplay;
  91         timings->vsync_len = mode->vsync_end - mode->vsync_start;
  92         timings->vback_porch = mode->vtotal - mode->vsync_end;
  93
  94         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
  95                 timings->flags |= DISPLAY_FLAGS_INTERLACED;
  96
  97         if (mode->flags & DRM_MODE_FLAG_DBLCLK)
  98                 timings->flags |= DISPLAY_FLAGS_DOUBLECLK;
  99
 100         if (mode->flags & DRM_MODE_FLAG_PHSYNC)
 101                 timings->flags |= DISPLAY_FLAGS_HSYNC_HIGH;
 102         else
 103                 timings->flags |= DISPLAY_FLAGS_HSYNC_LOW;
 104
 105         if (mode->flags & DRM_MODE_FLAG_PVSYNC)
 106                 timings->flags |= DISPLAY_FLAGS_VSYNC_HIGH;
 107         else
 108                 timings->flags |= DISPLAY_FLAGS_VSYNC_LOW;
 109
 110         timings->flags |= DISPLAY_FLAGS_DE_HIGH |
 111                           DISPLAY_FLAGS_PIXDATA_POSEDGE |
 112                           DISPLAY_FLAGS_SYNC_NEGEDGE;
 113 }
 114
 115 static enum drm_connector_status omap_connector_detect(
 116                 struct drm_connector *connector, bool force)
 117 {
 118         struct omap_connector *omap_connector = to_omap_connector(connector);
 119         struct omap_dss_device *dssdev = omap_connector->dssdev;
 120         struct omap_dss_driver *dssdrv = dssdev->driver;
 121         enum drm_connector_status ret;
 122
 123         if (dssdrv->detect) {
 124                 if (dssdrv->detect(dssdev))
 125                         ret = connector_status_connected;
 126                 else
 127                         ret = connector_status_disconnected;
 128         } else if (dssdev->type == OMAP_DISPLAY_TYPE_DPI ||
 129                         dssdev->type == OMAP_DISPLAY_TYPE_DBI ||
 130                         dssdev->type == OMAP_DISPLAY_TYPE_SDI ||
 131                         dssdev->type == OMAP_DISPLAY_TYPE_DSI) {
 132                 ret = connector_status_connected;
 133         } else {
 134                 ret = connector_status_unknown;
 135         }
 136
 137         VERB("%s: %d (force=%d)", omap_connector->dssdev->name, ret, force);
 138
 139         return ret;
 140 }
 141
 142 static void omap_connector_destroy(struct drm_connector *connector)
 143 {
 144         struct omap_connector *omap_connector = to_omap_connector(connector);
 145         struct omap_dss_device *dssdev = omap_connector->dssdev;
 146
 147         DBG("%s", omap_connector->dssdev->name);
 148         drm_connector_unregister(connector);
 149         drm_connector_cleanup(connector);
 150         kfree(omap_connector);
 151
 152         omap_dss_put_device(dssdev);
 153 }
 154
 155 #define MAX_EDID  512
 156
 157 static int omap_connector_get_modes(struct drm_connector *connector)
 158 {
 159         struct omap_connector *omap_connector = to_omap_connector(connector);
 160         struct omap_dss_device *dssdev = omap_connector->dssdev;
 161         struct omap_dss_driver *dssdrv = dssdev->driver;
 162         struct drm_device *dev = connector->dev;
 163         int n = 0;
 164
 165         DBG("%s", omap_connector->dssdev->name);
 166
 167         /* if display exposes EDID, then we parse that in the normal way to
 168          * build table of supported modes.. otherwise (ie. fixed resolution
 169          * LCD panels) we just return a single mode corresponding to the
 170          * currently configured timings:
 171          */
 172         if (dssdrv->read_edid) {
 173                 void *edid = kzalloc(MAX_EDID, GFP_KERNEL);
 174
 175                 if ((dssdrv->read_edid(dssdev, edid, MAX_EDID) > 0) &&
 176                                 drm_edid_is_valid(edid)) {
 177                         drm_mode_connector_update_edid_property(
 178                                         connector, edid);
 179                         n = drm_add_edid_modes(connector, edid);
 180
 181                         omap_connector->hdmi_mode =
 182                                 drm_detect_hdmi_monitor(edid);
 183                 } else {
 184                         drm_mode_connector_update_edid_property(
 185                                         connector, NULL);
 186                 }
 187
 188                 kfree(edid);
 189         } else {
 190                 struct drm_display_mode *mode = drm_mode_create(dev);
 191                 struct omap_video_timings timings = {0};
 192
 193                 dssdrv->get_timings(dssdev, &timings);
 194
 195                 copy_timings_omap_to_drm(mode, &timings);
 196
 197                 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
 198                 drm_mode_set_name(mode);
 199                 drm_mode_probed_add(connector, mode);
 200
 201                 n = 1;
 202         }
 203
 204         return n;
 205 }
 206
 207 static int omap_connector_mode_valid(struct drm_connector *connector,
 208                                  struct drm_display_mode *mode)
 209 {
 210         struct omap_connector *omap_connector = to_omap_connector(connector);
 211         struct omap_dss_device *dssdev = omap_connector->dssdev;
 212         struct omap_dss_driver *dssdrv = dssdev->driver;
 213         struct omap_video_timings timings = {0};
 214         struct drm_device *dev = connector->dev;
 215         struct drm_display_mode *new_mode;
 216         int r, ret = MODE_BAD;
 217
 218         copy_timings_drm_to_omap(&timings, mode);
 219         mode->vrefresh = drm_mode_vrefresh(mode);
 220
 221         /*
 222          * if the panel driver doesn't have a check_timings, it's most likely
 223          * a fixed resolution panel, check if the timings match with the
 224          * panel's timings
 225          */
 226         if (dssdrv->check_timings) {
 227                 r = dssdrv->check_timings(dssdev, &timings);
 228         } else {
 229                 struct omap_video_timings t = {0};
 230
 231                 dssdrv->get_timings(dssdev, &t);
 232
 233                 if (memcmp(&timings, &t, sizeof(struct omap_video_timings)))
 234                         r = -EINVAL;
 235                 else
 236                         r = 0;
 237         }
 238
 239         if (!r) {
 240                 /* check if vrefresh is still valid */
 241                 new_mode = drm_mode_duplicate(dev, mode);
 242                 new_mode->clock = timings.pixelclock / 1000;
 243                 new_mode->vrefresh = 0;
 244                 if (mode->vrefresh == drm_mode_vrefresh(new_mode))
 245                         ret = MODE_OK;
 246                 drm_mode_destroy(dev, new_mode);
 247         }
 248
 249         DBG("connector: mode %s: "
 250                         "%d:\"%s\" %d %d %d %d %d %d %d %d %d %d 0x%x 0x%x",
 251                         (ret == MODE_OK) ? "valid" : "invalid",
 252                         mode->base.id, mode->name, mode->vrefresh, mode->clock,
 253                         mode->hdisplay, mode->hsync_start,
 254                         mode->hsync_end, mode->htotal,
 255                         mode->vdisplay, mode->vsync_start,
 256                         mode->vsync_end, mode->vtotal, mode->type, mode->flags);
 257
 258         return ret;
 259 }
 260
 261 static const struct drm_connector_funcs omap_connector_funcs = {
 262         .dpms = drm_atomic_helper_connector_dpms,
 263         .reset = drm_atomic_helper_connector_reset,
 264         .detect = omap_connector_detect,
 265         .fill_modes = drm_helper_probe_single_connector_modes,
 266         .destroy = omap_connector_destroy,
 267         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 268         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 269 };
 270
 271 static const struct drm_connector_helper_funcs omap_connector_helper_funcs = {
 272         .get_modes = omap_connector_get_modes,
 273         .mode_valid = omap_connector_mode_valid,
 274 };
 275
 276 /* initialize connector */
 277 struct drm_connector *omap_connector_init(struct drm_device *dev,
 278                 int connector_type, struct omap_dss_device *dssdev,
 279                 struct drm_encoder *encoder)
 280 {
 281         struct drm_connector *connector = NULL;
 282         struct omap_connector *omap_connector;
 283
 284         DBG("%s", dssdev->name);
 285
 286         omap_dss_get_device(dssdev);
 287
 288         omap_connector = kzalloc(sizeof(struct omap_connector), GFP_KERNEL);
 289         if (!omap_connector)
 290                 goto fail;
 291
 292         omap_connector->dssdev = dssdev;
 293
 294         connector = &omap_connector->base;
 295
 296         drm_connector_init(dev, connector, &omap_connector_funcs,
 297                                 connector_type);
 298         drm_connector_helper_add(connector, &omap_connector_helper_funcs);
 299
 300 #if 0 /* enable when dss2 supports hotplug */
 301         if (dssdev->caps & OMAP_DSS_DISPLAY_CAP_HPD)
 302                 connector->polled = 0;
 303         else
 304 #endif
 305                 connector->polled = DRM_CONNECTOR_POLL_CONNECT |
 306                                 DRM_CONNECTOR_POLL_DISCONNECT;
 307
 308         connector->interlace_allowed = 1;
 309         connector->doublescan_allowed = 0;
 310
 311         drm_connector_register(connector);
 312
 313         return connector;
 314
 315 fail:
 316         if (connector)
 317                 omap_connector_destroy(connector);
 318
 319         return NULL;
 320 }