drivers/gpu/drm/exynos/exynos_drm_connector.c

   1 /*
   2  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
   3  * Authors:
   4  *      Inki Dae <inki.dae@samsung.com>
   5  *      Joonyoung Shim <jy0922.shim@samsung.com>
   6  *      Seung-Woo Kim <sw0312.kim@samsung.com>
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the "Software"),
  10  * to deal in the Software without restriction, including without limitation
  11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12  * and/or sell copies of the Software, and to permit persons to whom the
  13  * Software is furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the next
  16  * paragraph) shall be included in all copies or substantial portions of the
  17  * Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  23  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  24  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  25  * OTHER DEALINGS IN THE SOFTWARE.
  26  */
  27
  28 #include "drmP.h"
  29 #include "drm_crtc_helper.h"
  30
  31 #include "exynos_drm_drv.h"
  32 #include "exynos_drm_encoder.h"
  33
  34 #define MAX_EDID 256
  35 #define to_exynos_connector(x)  container_of(x, struct exynos_drm_connector,\
  36                                 drm_connector)
  37
  38 struct exynos_drm_connector {
  39         struct drm_connector    drm_connector;
  40         uint32_t                encoder_id;
  41         struct exynos_drm_manager *manager;
  42 };
  43
  44 /* convert exynos_video_timings to drm_display_mode */
  45 static inline void
  46 convert_to_display_mode(struct drm_display_mode *mode,
  47                         struct fb_videomode *timing)
  48 {
  49         DRM_DEBUG_KMS("%s\n", __FILE__);
  50
  51         mode->clock = timing->pixclock / 1000;
  52         mode->vrefresh = timing->refresh;
  53
  54         mode->hdisplay = timing->xres;
  55         mode->hsync_start = mode->hdisplay + timing->left_margin;
  56         mode->hsync_end = mode->hsync_start + timing->hsync_len;
  57         mode->htotal = mode->hsync_end + timing->right_margin;
  58
  59         mode->vdisplay = timing->yres;
  60         mode->vsync_start = mode->vdisplay + timing->upper_margin;
  61         mode->vsync_end = mode->vsync_start + timing->vsync_len;
  62         mode->vtotal = mode->vsync_end + timing->lower_margin;
  63
  64         if (timing->vmode & FB_VMODE_INTERLACED)
  65                 mode->flags |= DRM_MODE_FLAG_INTERLACE;
  66
  67         if (timing->vmode & FB_VMODE_DOUBLE)
  68                 mode->flags |= DRM_MODE_FLAG_DBLSCAN;
  69 }
  70
  71 /* convert drm_display_mode to exynos_video_timings */
  72 static inline void
  73 convert_to_video_timing(struct fb_videomode *timing,
  74                         struct drm_display_mode *mode)
  75 {
  76         DRM_DEBUG_KMS("%s\n", __FILE__);
  77
  78         memset(timing, 0, sizeof(*timing));
  79
  80         timing->pixclock = mode->clock * 1000;
  81         timing->refresh = drm_mode_vrefresh(mode);
  82
  83         timing->xres = mode->hdisplay;
  84         timing->left_margin = mode->hsync_start - mode->hdisplay;
  85         timing->hsync_len = mode->hsync_end - mode->hsync_start;
  86         timing->right_margin = mode->htotal - mode->hsync_end;
  87
  88         timing->yres = mode->vdisplay;
  89         timing->upper_margin = mode->vsync_start - mode->vdisplay;
  90         timing->vsync_len = mode->vsync_end - mode->vsync_start;
  91         timing->lower_margin = mode->vtotal - mode->vsync_end;
  92
  93         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
  94                 timing->vmode = FB_VMODE_INTERLACED;
  95         else
  96                 timing->vmode = FB_VMODE_NONINTERLACED;
  97
  98         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
  99                 timing->vmode |= FB_VMODE_DOUBLE;
 100 }
 101
 102 static int exynos_drm_connector_get_modes(struct drm_connector *connector)
 103 {
 104         struct exynos_drm_connector *exynos_connector =
 105                                         to_exynos_connector(connector);
 106         struct exynos_drm_manager *manager = exynos_connector->manager;
 107         struct exynos_drm_display_ops *display_ops = manager->display_ops;
 108         unsigned int count;
 109
 110         DRM_DEBUG_KMS("%s\n", __FILE__);
 111
 112         if (!display_ops) {
 113                 DRM_DEBUG_KMS("display_ops is null.\n");
 114                 return 0;
 115         }
 116
 117         /*
 118          * if get_edid() exists then get_edid() callback of hdmi side
 119          * is called to get edid data through i2c interface else
 120          * get timing from the FIMD driver(display controller).
 121          *
 122          * P.S. in case of lcd panel, count is always 1 if success
 123          * because lcd panel has only one mode.
 124          */
 125         if (display_ops->get_edid) {
 126                 int ret;
 127                 void *edid;
 128
 129                 edid = kzalloc(MAX_EDID, GFP_KERNEL);
 130                 if (!edid) {
 131                         DRM_ERROR("failed to allocate edid\n");
 132                         return 0;
 133                 }
 134
 135                 ret = display_ops->get_edid(manager->dev, connector,
 136                                                 edid, MAX_EDID);
 137                 if (ret < 0) {
 138                         DRM_ERROR("failed to get edid data.\n");
 139                         kfree(edid);
 140                         edid = NULL;
 141                         return 0;
 142                 }
 143
 144                 drm_mode_connector_update_edid_property(connector, edid);
 145                 count = drm_add_edid_modes(connector, edid);
 146
 147                 kfree(connector->display_info.raw_edid);
 148                 connector->display_info.raw_edid = edid;
 149         } else {
 150                 struct drm_display_mode *mode = drm_mode_create(connector->dev);
 151                 struct fb_videomode *timing;
 152
 153                 if (display_ops->get_timing)
 154                         timing = display_ops->get_timing(manager->dev);
 155                 else {
 156                         drm_mode_destroy(connector->dev, mode);
 157                         return 0;
 158                 }
 159
 160                 convert_to_display_mode(mode, timing);
 161
 162                 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
 163                 drm_mode_set_name(mode);
 164                 drm_mode_probed_add(connector, mode);
 165
 166                 count = 1;
 167         }
 168
 169         return count;
 170 }
 171
 172 static int exynos_drm_connector_mode_valid(struct drm_connector *connector,
 173                                             struct drm_display_mode *mode)
 174 {
 175         struct exynos_drm_connector *exynos_connector =
 176                                         to_exynos_connector(connector);
 177         struct exynos_drm_manager *manager = exynos_connector->manager;
 178         struct exynos_drm_display_ops *display_ops = manager->display_ops;
 179         struct fb_videomode timing;
 180         int ret = MODE_BAD;
 181
 182         DRM_DEBUG_KMS("%s\n", __FILE__);
 183
 184         convert_to_video_timing(&timing, mode);
 185
 186         if (display_ops && display_ops->check_timing)
 187                 if (!display_ops->check_timing(manager->dev, (void *)&timing))
 188                         ret = MODE_OK;
 189
 190         return ret;
 191 }
 192
 193 struct drm_encoder *exynos_drm_best_encoder(struct drm_connector *connector)
 194 {
 195         struct drm_device *dev = connector->dev;
 196         struct exynos_drm_connector *exynos_connector =
 197                                         to_exynos_connector(connector);
 198         struct drm_mode_object *obj;
 199         struct drm_encoder *encoder;
 200
 201         DRM_DEBUG_KMS("%s\n", __FILE__);
 202
 203         obj = drm_mode_object_find(dev, exynos_connector->encoder_id,
 204                                    DRM_MODE_OBJECT_ENCODER);
 205         if (!obj) {
 206                 DRM_DEBUG_KMS("Unknown ENCODER ID %d\n",
 207                                 exynos_connector->encoder_id);
 208                 return NULL;
 209         }
 210
 211         encoder = obj_to_encoder(obj);
 212
 213         return encoder;
 214 }
 215
 216 static struct drm_connector_helper_funcs exynos_connector_helper_funcs = {
 217         .get_modes      = exynos_drm_connector_get_modes,
 218         .mode_valid     = exynos_drm_connector_mode_valid,
 219         .best_encoder   = exynos_drm_best_encoder,
 220 };
 221
 222 /* get detection status of display device. */
 223 static enum drm_connector_status
 224 exynos_drm_connector_detect(struct drm_connector *connector, bool force)
 225 {
 226         struct exynos_drm_connector *exynos_connector =
 227                                         to_exynos_connector(connector);
 228         struct exynos_drm_manager *manager = exynos_connector->manager;
 229         struct exynos_drm_display_ops *display_ops =
 230                                         manager->display_ops;
 231         enum drm_connector_status status = connector_status_disconnected;
 232
 233         DRM_DEBUG_KMS("%s\n", __FILE__);
 234
 235         if (display_ops && display_ops->is_connected) {
 236                 if (display_ops->is_connected(manager->dev))
 237                         status = connector_status_connected;
 238                 else
 239                         status = connector_status_disconnected;
 240         }
 241
 242         return status;
 243 }
 244
 245 static void exynos_drm_connector_destroy(struct drm_connector *connector)
 246 {
 247         struct exynos_drm_connector *exynos_connector =
 248                 to_exynos_connector(connector);
 249
 250         DRM_DEBUG_KMS("%s\n", __FILE__);
 251
 252         drm_sysfs_connector_remove(connector);
 253         drm_connector_cleanup(connector);
 254         kfree(exynos_connector);
 255 }
 256
 257 static struct drm_connector_funcs exynos_connector_funcs = {
 258         .dpms           = drm_helper_connector_dpms,
 259         .fill_modes     = drm_helper_probe_single_connector_modes,
 260         .detect         = exynos_drm_connector_detect,
 261         .destroy        = exynos_drm_connector_destroy,
 262 };
 263
 264 struct drm_connector *exynos_drm_connector_create(struct drm_device *dev,
 265                                                    struct drm_encoder *encoder)
 266 {
 267         struct exynos_drm_connector *exynos_connector;
 268         struct exynos_drm_manager *manager = exynos_drm_get_manager(encoder);
 269         struct drm_connector *connector;
 270         int type;
 271         int err;
 272
 273         DRM_DEBUG_KMS("%s\n", __FILE__);
 274
 275         exynos_connector = kzalloc(sizeof(*exynos_connector), GFP_KERNEL);
 276         if (!exynos_connector) {
 277                 DRM_ERROR("failed to allocate connector\n");
 278                 return NULL;
 279         }
 280
 281         connector = &exynos_connector->drm_connector;
 282
 283         switch (manager->display_ops->type) {
 284         case EXYNOS_DISPLAY_TYPE_HDMI:
 285                 type = DRM_MODE_CONNECTOR_HDMIA;
 286                 connector->interlace_allowed = true;
 287                 connector->polled = DRM_CONNECTOR_POLL_HPD;
 288                 break;
 289         default:
 290                 type = DRM_MODE_CONNECTOR_Unknown;
 291                 break;
 292         }
 293
 294         drm_connector_init(dev, connector, &exynos_connector_funcs, type);
 295         drm_connector_helper_add(connector, &exynos_connector_helper_funcs);
 296
 297         err = drm_sysfs_connector_add(connector);
 298         if (err)
 299                 goto err_connector;
 300
 301         exynos_connector->encoder_id = encoder->base.id;
 302         exynos_connector->manager = manager;
 303         connector->encoder = encoder;
 304
 305         err = drm_mode_connector_attach_encoder(connector, encoder);
 306         if (err) {
 307                 DRM_ERROR("failed to attach a connector to a encoder\n");
 308                 goto err_sysfs;
 309         }
 310
 311         DRM_DEBUG_KMS("connector has been created\n");
 312
 313         return connector;
 314
 315 err_sysfs:
 316         drm_sysfs_connector_remove(connector);
 317 err_connector:
 318         drm_connector_cleanup(connector);
 319         kfree(exynos_connector);
 320         return NULL;
 321 }
 322
 323 MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
 324 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
 325 MODULE_AUTHOR("Seung-Woo Kim <sw0312.kim@samsung.com>");
 326 MODULE_DESCRIPTION("Samsung SoC DRM Connector Driver");
 327 MODULE_LICENSE("GPL");