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 "omap_drv.h"
  21
  22 #include "drm_crtc.h"
  23 #include "drm_crtc_helper.h"
  24
  25 /*
  26  * connector funcs
  27  */
  28
  29 #define to_omap_connector(x) container_of(x, struct omap_connector, base)
  30
  31 struct omap_connector {
  32         struct drm_connector base;
  33         struct omap_dss_device *dssdev;
  34         struct drm_encoder *encoder;
  35 };
  36
  37 void copy_timings_omap_to_drm(struct drm_display_mode *mode,
  38                 struct omap_video_timings *timings)
  39 {
  40         mode->clock = timings->pixel_clock;
  41
  42         mode->hdisplay = timings->x_res;
  43         mode->hsync_start = mode->hdisplay + timings->hfp;
  44         mode->hsync_end = mode->hsync_start + timings->hsw;
  45         mode->htotal = mode->hsync_end + timings->hbp;
  46
  47         mode->vdisplay = timings->y_res;
  48         mode->vsync_start = mode->vdisplay + timings->vfp;
  49         mode->vsync_end = mode->vsync_start + timings->vsw;
  50         mode->vtotal = mode->vsync_end + timings->vbp;
  51
  52         mode->flags = 0;
  53
  54         if (timings->interlace)
  55                 mode->flags |= DRM_MODE_FLAG_INTERLACE;
  56
  57         if (timings->hsync_level == OMAPDSS_SIG_ACTIVE_HIGH)
  58                 mode->flags |= DRM_MODE_FLAG_PHSYNC;
  59         else
  60                 mode->flags |= DRM_MODE_FLAG_NHSYNC;
  61
  62         if (timings->vsync_level == OMAPDSS_SIG_ACTIVE_HIGH)
  63                 mode->flags |= DRM_MODE_FLAG_PVSYNC;
  64         else
  65                 mode->flags |= DRM_MODE_FLAG_NVSYNC;
  66 }
  67
  68 void copy_timings_drm_to_omap(struct omap_video_timings *timings,
  69                 struct drm_display_mode *mode)
  70 {
  71         timings->pixel_clock = mode->clock;
  72
  73         timings->x_res = mode->hdisplay;
  74         timings->hfp = mode->hsync_start - mode->hdisplay;
  75         timings->hsw = mode->hsync_end - mode->hsync_start;
  76         timings->hbp = mode->htotal - mode->hsync_end;
  77
  78         timings->y_res = mode->vdisplay;
  79         timings->vfp = mode->vsync_start - mode->vdisplay;
  80         timings->vsw = mode->vsync_end - mode->vsync_start;
  81         timings->vbp = mode->vtotal - mode->vsync_end;
  82
  83         timings->interlace = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
  84
  85         if (mode->flags & DRM_MODE_FLAG_PHSYNC)
  86                 timings->hsync_level = OMAPDSS_SIG_ACTIVE_HIGH;
  87         else
  88                 timings->hsync_level = OMAPDSS_SIG_ACTIVE_LOW;
  89
  90         if (mode->flags & DRM_MODE_FLAG_PVSYNC)
  91                 timings->vsync_level = OMAPDSS_SIG_ACTIVE_HIGH;
  92         else
  93                 timings->vsync_level = OMAPDSS_SIG_ACTIVE_LOW;
  94
  95         timings->data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE;
  96         timings->de_level = OMAPDSS_SIG_ACTIVE_HIGH;
  97         timings->sync_pclk_edge = OMAPDSS_DRIVE_SIG_OPPOSITE_EDGES;
  98 }
  99
 100 static enum drm_connector_status omap_connector_detect(
 101                 struct drm_connector *connector, bool force)
 102 {
 103         struct omap_connector *omap_connector = to_omap_connector(connector);
 104         struct omap_dss_device *dssdev = omap_connector->dssdev;
 105         struct omap_dss_driver *dssdrv = dssdev->driver;
 106         enum drm_connector_status ret;
 107
 108         if (dssdrv->detect) {
 109                 if (dssdrv->detect(dssdev))
 110                         ret = connector_status_connected;
 111                 else
 112                         ret = connector_status_disconnected;
 113         } else if (dssdev->type == OMAP_DISPLAY_TYPE_DPI ||
 114                         dssdev->type == OMAP_DISPLAY_TYPE_DBI ||
 115                         dssdev->type == OMAP_DISPLAY_TYPE_SDI ||
 116                         dssdev->type == OMAP_DISPLAY_TYPE_DSI) {
 117                 ret = connector_status_connected;
 118         } else {
 119                 ret = connector_status_unknown;
 120         }
 121
 122         VERB("%s: %d (force=%d)", omap_connector->dssdev->name, ret, force);
 123
 124         return ret;
 125 }
 126
 127 static void omap_connector_destroy(struct drm_connector *connector)
 128 {
 129         struct omap_connector *omap_connector = to_omap_connector(connector);
 130         struct omap_dss_device *dssdev = omap_connector->dssdev;
 131
 132         DBG("%s", omap_connector->dssdev->name);
 133         drm_sysfs_connector_remove(connector);
 134         drm_connector_cleanup(connector);
 135         kfree(omap_connector);
 136
 137         omap_dss_put_device(dssdev);
 138 }
 139
 140 #define MAX_EDID  512
 141
 142 static int omap_connector_get_modes(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         struct omap_dss_driver *dssdrv = dssdev->driver;
 147         struct drm_device *dev = connector->dev;
 148         int n = 0;
 149
 150         DBG("%s", omap_connector->dssdev->name);
 151
 152         /* if display exposes EDID, then we parse that in the normal way to
 153          * build table of supported modes.. otherwise (ie. fixed resolution
 154          * LCD panels) we just return a single mode corresponding to the
 155          * currently configured timings:
 156          */
 157         if (dssdrv->read_edid) {
 158                 void *edid = kzalloc(MAX_EDID, GFP_KERNEL);
 159
 160                 if ((dssdrv->read_edid(dssdev, edid, MAX_EDID) > 0) &&
 161                                 drm_edid_is_valid(edid)) {
 162                         drm_mode_connector_update_edid_property(
 163                                         connector, edid);
 164                         n = drm_add_edid_modes(connector, edid);
 165                 } else {
 166                         drm_mode_connector_update_edid_property(
 167                                         connector, NULL);
 168                 }
 169                 kfree(edid);
 170         } else {
 171                 struct drm_display_mode *mode = drm_mode_create(dev);
 172                 struct omap_video_timings timings = {0};
 173
 174                 dssdrv->get_timings(dssdev, &timings);
 175
 176                 copy_timings_omap_to_drm(mode, &timings);
 177
 178                 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
 179                 drm_mode_set_name(mode);
 180                 drm_mode_probed_add(connector, mode);
 181
 182                 n = 1;
 183         }
 184
 185         return n;
 186 }
 187
 188 static int omap_connector_mode_valid(struct drm_connector *connector,
 189                                  struct drm_display_mode *mode)
 190 {
 191         struct omap_connector *omap_connector = to_omap_connector(connector);
 192         struct omap_dss_device *dssdev = omap_connector->dssdev;
 193         struct omap_dss_driver *dssdrv = dssdev->driver;
 194         struct omap_video_timings timings = {0};
 195         struct drm_device *dev = connector->dev;
 196         struct drm_display_mode *new_mode;
 197         int r, ret = MODE_BAD;
 198
 199         copy_timings_drm_to_omap(&timings, mode);
 200         mode->vrefresh = drm_mode_vrefresh(mode);
 201
 202         /*
 203          * if the panel driver doesn't have a check_timings, it's most likely
 204          * a fixed resolution panel, check if the timings match with the
 205          * panel's timings
 206          */
 207         if (dssdrv->check_timings) {
 208                 r = dssdrv->check_timings(dssdev, &timings);
 209         } else {
 210                 struct omap_video_timings t = {0};
 211
 212                 dssdrv->get_timings(dssdev, &t);
 213
 214                 if (memcmp(&timings, &t, sizeof(struct omap_video_timings)))
 215                         r = -EINVAL;
 216                 else
 217                         r = 0;
 218         }
 219
 220         if (!r) {
 221                 /* check if vrefresh is still valid */
 222                 new_mode = drm_mode_duplicate(dev, mode);
 223                 new_mode->clock = timings.pixel_clock;
 224                 new_mode->vrefresh = 0;
 225                 if (mode->vrefresh == drm_mode_vrefresh(new_mode))
 226                         ret = MODE_OK;
 227                 drm_mode_destroy(dev, new_mode);
 228         }
 229
 230         DBG("connector: mode %s: "
 231                         "%d:\"%s\" %d %d %d %d %d %d %d %d %d %d 0x%x 0x%x",
 232                         (ret == MODE_OK) ? "valid" : "invalid",
 233                         mode->base.id, mode->name, mode->vrefresh, mode->clock,
 234                         mode->hdisplay, mode->hsync_start,
 235                         mode->hsync_end, mode->htotal,
 236                         mode->vdisplay, mode->vsync_start,
 237                         mode->vsync_end, mode->vtotal, mode->type, mode->flags);
 238
 239         return ret;
 240 }
 241
 242 struct drm_encoder *omap_connector_attached_encoder(
 243                 struct drm_connector *connector)
 244 {
 245         struct omap_connector *omap_connector = to_omap_connector(connector);
 246         return omap_connector->encoder;
 247 }
 248
 249 static const struct drm_connector_funcs omap_connector_funcs = {
 250         .dpms = drm_helper_connector_dpms,
 251         .detect = omap_connector_detect,
 252         .fill_modes = drm_helper_probe_single_connector_modes,
 253         .destroy = omap_connector_destroy,
 254 };
 255
 256 static const struct drm_connector_helper_funcs omap_connector_helper_funcs = {
 257         .get_modes = omap_connector_get_modes,
 258         .mode_valid = omap_connector_mode_valid,
 259         .best_encoder = omap_connector_attached_encoder,
 260 };
 261
 262 /* flush an area of the framebuffer (in case of manual update display that
 263  * is not automatically flushed)
 264  */
 265 void omap_connector_flush(struct drm_connector *connector,
 266                 int x, int y, int w, int h)
 267 {
 268         struct omap_connector *omap_connector = to_omap_connector(connector);
 269
 270         /* TODO: enable when supported in dss */
 271         VERB("%s: %d,%d, %dx%d", omap_connector->dssdev->name, x, y, w, h);
 272 }
 273
 274 /* initialize connector */
 275 struct drm_connector *omap_connector_init(struct drm_device *dev,
 276                 int connector_type, struct omap_dss_device *dssdev,
 277                 struct drm_encoder *encoder)
 278 {
 279         struct drm_connector *connector = NULL;
 280         struct omap_connector *omap_connector;
 281
 282         DBG("%s", dssdev->name);
 283
 284         omap_dss_get_device(dssdev);
 285
 286         omap_connector = kzalloc(sizeof(struct omap_connector), GFP_KERNEL);
 287         if (!omap_connector)
 288                 goto fail;
 289
 290         omap_connector->dssdev = dssdev;
 291         omap_connector->encoder = encoder;
 292
 293         connector = &omap_connector->base;
 294
 295         drm_connector_init(dev, connector, &omap_connector_funcs,
 296                                 connector_type);
 297         drm_connector_helper_add(connector, &omap_connector_helper_funcs);
 298
 299 #if 0 /* enable when dss2 supports hotplug */
 300         if (dssdev->caps & OMAP_DSS_DISPLAY_CAP_HPD)
 301                 connector->polled = 0;
 302         else
 303 #endif
 304                 connector->polled = DRM_CONNECTOR_POLL_CONNECT |
 305                                 DRM_CONNECTOR_POLL_DISCONNECT;
 306
 307         connector->interlace_allowed = 1;
 308         connector->doublescan_allowed = 0;
 309
 310         drm_sysfs_connector_add(connector);
 311
 312         return connector;
 313
 314 fail:
 315         if (connector)
 316                 omap_connector_destroy(connector);
 317
 318         return NULL;
 319 }