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