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         struct drm_encoder *encoder;
  36         bool hdmi_mode;
  37 };
  38
  39 bool omap_connector_get_hdmi_mode(struct drm_connector *connector)
  40 {
  41         struct omap_connector *omap_connector = to_omap_connector(connector);
  42
  43         return omap_connector->hdmi_mode;
  44 }
  45
  46 void copy_timings_omap_to_drm(struct drm_display_mode *mode,
  47                 struct omap_video_timings *timings)
  48 {
  49         mode->clock = timings->pixelclock / 1000;
  50
  51         mode->hdisplay = timings->x_res;
  52         mode->hsync_start = mode->hdisplay + timings->hfp;
  53         mode->hsync_end = mode->hsync_start + timings->hsw;
  54         mode->htotal = mode->hsync_end + timings->hbp;
  55
  56         mode->vdisplay = timings->y_res;
  57         mode->vsync_start = mode->vdisplay + timings->vfp;
  58         mode->vsync_end = mode->vsync_start + timings->vsw;
  59         mode->vtotal = mode->vsync_end + timings->vbp;
  60
  61         mode->flags = 0;
  62
  63         if (timings->interlace)
  64                 mode->flags |= DRM_MODE_FLAG_INTERLACE;
  65
  66         if (timings->double_pixel)
  67                 mode->flags |= DRM_MODE_FLAG_DBLCLK;
  68
  69         if (timings->hsync_level == OMAPDSS_SIG_ACTIVE_HIGH)
  70                 mode->flags |= DRM_MODE_FLAG_PHSYNC;
  71         else
  72                 mode->flags |= DRM_MODE_FLAG_NHSYNC;
  73
  74         if (timings->vsync_level == OMAPDSS_SIG_ACTIVE_HIGH)
  75                 mode->flags |= DRM_MODE_FLAG_PVSYNC;
  76         else
  77                 mode->flags |= DRM_MODE_FLAG_NVSYNC;
  78 }
  79
  80 void copy_timings_drm_to_omap(struct omap_video_timings *timings,
  81                 struct drm_display_mode *mode)
  82 {
  83         timings->pixelclock = mode->clock * 1000;
  84
  85         timings->x_res = mode->hdisplay;
  86         timings->hfp = mode->hsync_start - mode->hdisplay;
  87         timings->hsw = mode->hsync_end - mode->hsync_start;
  88         timings->hbp = mode->htotal - mode->hsync_end;
  89
  90         timings->y_res = mode->vdisplay;
  91         timings->vfp = mode->vsync_start - mode->vdisplay;
  92         timings->vsw = mode->vsync_end - mode->vsync_start;
  93         timings->vbp = mode->vtotal - mode->vsync_end;
  94
  95         timings->interlace = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
  96         timings->double_pixel = !!(mode->flags & DRM_MODE_FLAG_DBLCLK);
  97
  98         if (mode->flags & DRM_MODE_FLAG_PHSYNC)
  99                 timings->hsync_level = OMAPDSS_SIG_ACTIVE_HIGH;
 100         else
 101                 timings->hsync_level = OMAPDSS_SIG_ACTIVE_LOW;
 102
 103         if (mode->flags & DRM_MODE_FLAG_PVSYNC)
 104                 timings->vsync_level = OMAPDSS_SIG_ACTIVE_HIGH;
 105         else
 106                 timings->vsync_level = OMAPDSS_SIG_ACTIVE_LOW;
 107
 108         timings->data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE;
 109         timings->de_level = OMAPDSS_SIG_ACTIVE_HIGH;
 110         timings->sync_pclk_edge = OMAPDSS_DRIVE_SIG_FALLING_EDGE;
 111 }
 112
 113 static enum drm_connector_status omap_connector_detect(
 114                 struct drm_connector *connector, bool force)
 115 {
 116         struct omap_connector *omap_connector = to_omap_connector(connector);
 117         struct omap_dss_device *dssdev = omap_connector->dssdev;
 118         struct omap_dss_driver *dssdrv = dssdev->driver;
 119         enum drm_connector_status ret;
 120
 121         if (dssdrv->detect) {
 122                 if (dssdrv->detect(dssdev))
 123                         ret = connector_status_connected;
 124                 else
 125                         ret = connector_status_disconnected;
 126         } else if (dssdev->type == OMAP_DISPLAY_TYPE_DPI ||
 127                         dssdev->type == OMAP_DISPLAY_TYPE_DBI ||
 128                         dssdev->type == OMAP_DISPLAY_TYPE_SDI ||
 129                         dssdev->type == OMAP_DISPLAY_TYPE_DSI) {
 130                 ret = connector_status_connected;
 131         } else {
 132                 ret = connector_status_unknown;
 133         }
 134
 135         VERB("%s: %d (force=%d)", omap_connector->dssdev->name, ret, force);
 136
 137         return ret;
 138 }
 139
 140 static void omap_connector_destroy(struct drm_connector *connector)
 141 {
 142         struct omap_connector *omap_connector = to_omap_connector(connector);
 143         struct omap_dss_device *dssdev = omap_connector->dssdev;
 144
 145         DBG("%s", omap_connector->dssdev->name);
 146         drm_connector_unregister(connector);
 147         drm_connector_cleanup(connector);
 148         kfree(omap_connector);
 149
 150         omap_dss_put_device(dssdev);
 151 }
 152
 153 #define MAX_EDID  512
 154
 155 static int omap_connector_get_modes(struct drm_connector *connector)
 156 {
 157         struct omap_connector *omap_connector = to_omap_connector(connector);
 158         struct omap_dss_device *dssdev = omap_connector->dssdev;
 159         struct omap_dss_driver *dssdrv = dssdev->driver;
 160         struct drm_device *dev = connector->dev;
 161         int n = 0;
 162
 163         DBG("%s", omap_connector->dssdev->name);
 164
 165         /* if display exposes EDID, then we parse that in the normal way to
 166          * build table of supported modes.. otherwise (ie. fixed resolution
 167          * LCD panels) we just return a single mode corresponding to the
 168          * currently configured timings:
 169          */
 170         if (dssdrv->read_edid) {
 171                 void *edid = kzalloc(MAX_EDID, GFP_KERNEL);
 172
 173                 if ((dssdrv->read_edid(dssdev, edid, MAX_EDID) > 0) &&
 174                                 drm_edid_is_valid(edid)) {
 175                         drm_mode_connector_update_edid_property(
 176                                         connector, edid);
 177                         n = drm_add_edid_modes(connector, edid);
 178
 179                         omap_connector->hdmi_mode =
 180                                 drm_detect_hdmi_monitor(edid);
 181                 } else {
 182                         drm_mode_connector_update_edid_property(
 183                                         connector, NULL);
 184                 }
 185
 186                 kfree(edid);
 187         } else {
 188                 struct drm_display_mode *mode = drm_mode_create(dev);
 189                 struct omap_video_timings timings = {0};
 190
 191                 dssdrv->get_timings(dssdev, &timings);
 192
 193                 copy_timings_omap_to_drm(mode, &timings);
 194
 195                 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
 196                 drm_mode_set_name(mode);
 197                 drm_mode_probed_add(connector, mode);
 198
 199                 n = 1;
 200         }
 201
 202         return n;
 203 }
 204
 205 static int omap_connector_mode_valid(struct drm_connector *connector,
 206                                  struct drm_display_mode *mode)
 207 {
 208         struct omap_connector *omap_connector = to_omap_connector(connector);
 209         struct omap_dss_device *dssdev = omap_connector->dssdev;
 210         struct omap_dss_driver *dssdrv = dssdev->driver;
 211         struct omap_video_timings timings = {0};
 212         struct drm_device *dev = connector->dev;
 213         struct drm_display_mode *new_mode;
 214         int r, ret = MODE_BAD;
 215
 216         copy_timings_drm_to_omap(&timings, mode);
 217         mode->vrefresh = drm_mode_vrefresh(mode);
 218
 219         /*
 220          * if the panel driver doesn't have a check_timings, it's most likely
 221          * a fixed resolution panel, check if the timings match with the
 222          * panel's timings
 223          */
 224         if (dssdrv->check_timings) {
 225                 r = dssdrv->check_timings(dssdev, &timings);
 226         } else {
 227                 struct omap_video_timings t = {0};
 228
 229                 dssdrv->get_timings(dssdev, &t);
 230
 231                 if (memcmp(&timings, &t, sizeof(struct omap_video_timings)))
 232                         r = -EINVAL;
 233                 else
 234                         r = 0;
 235         }
 236
 237         if (!r) {
 238                 /* check if vrefresh is still valid */
 239                 new_mode = drm_mode_duplicate(dev, mode);
 240                 new_mode->clock = timings.pixelclock / 1000;
 241                 new_mode->vrefresh = 0;
 242                 if (mode->vrefresh == drm_mode_vrefresh(new_mode))
 243                         ret = MODE_OK;
 244                 drm_mode_destroy(dev, new_mode);
 245         }
 246
 247         DBG("connector: mode %s: "
 248                         "%d:\"%s\" %d %d %d %d %d %d %d %d %d %d 0x%x 0x%x",
 249                         (ret == MODE_OK) ? "valid" : "invalid",
 250                         mode->base.id, mode->name, mode->vrefresh, mode->clock,
 251                         mode->hdisplay, mode->hsync_start,
 252                         mode->hsync_end, mode->htotal,
 253                         mode->vdisplay, mode->vsync_start,
 254                         mode->vsync_end, mode->vtotal, mode->type, mode->flags);
 255
 256         return ret;
 257 }
 258
 259 struct drm_encoder *omap_connector_attached_encoder(
 260                 struct drm_connector *connector)
 261 {
 262         struct omap_connector *omap_connector = to_omap_connector(connector);
 263         return omap_connector->encoder;
 264 }
 265
 266 static const struct drm_connector_funcs omap_connector_funcs = {
 267         .dpms = drm_atomic_helper_connector_dpms,
 268         .reset = drm_atomic_helper_connector_reset,
 269         .detect = omap_connector_detect,
 270         .fill_modes = drm_helper_probe_single_connector_modes,
 271         .destroy = omap_connector_destroy,
 272         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 273         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 274 };
 275
 276 static const struct drm_connector_helper_funcs omap_connector_helper_funcs = {
 277         .get_modes = omap_connector_get_modes,
 278         .mode_valid = omap_connector_mode_valid,
 279         .best_encoder = omap_connector_attached_encoder,
 280 };
 281
 282 /* initialize connector */
 283 struct drm_connector *omap_connector_init(struct drm_device *dev,
 284                 int connector_type, struct omap_dss_device *dssdev,
 285                 struct drm_encoder *encoder)
 286 {
 287         struct drm_connector *connector = NULL;
 288         struct omap_connector *omap_connector;
 289
 290         DBG("%s", dssdev->name);
 291
 292         omap_dss_get_device(dssdev);
 293
 294         omap_connector = kzalloc(sizeof(struct omap_connector), GFP_KERNEL);
 295         if (!omap_connector)
 296                 goto fail;
 297
 298         omap_connector->dssdev = dssdev;
 299         omap_connector->encoder = encoder;
 300
 301         connector = &omap_connector->base;
 302
 303         drm_connector_init(dev, connector, &omap_connector_funcs,
 304                                 connector_type);
 305         drm_connector_helper_add(connector, &omap_connector_helper_funcs);
 306
 307 #if 0 /* enable when dss2 supports hotplug */
 308         if (dssdev->caps & OMAP_DSS_DISPLAY_CAP_HPD)
 309                 connector->polled = 0;
 310         else
 311 #endif
 312                 connector->polled = DRM_CONNECTOR_POLL_CONNECT |
 313                                 DRM_CONNECTOR_POLL_DISCONNECT;
 314
 315         connector->interlace_allowed = 1;
 316         connector->doublescan_allowed = 0;
 317
 318         drm_connector_register(connector);
 319
 320         return connector;
 321
 322 fail:
 323         if (connector)
 324                 omap_connector_destroy(connector);
 325
 326         return NULL;
 327 }