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  * This program is free software; you can redistribute  it and/or modify it
   9  * under  the terms of  the GNU General  Public License as published by the
  10  * Free Software Foundation;  either version 2 of the  License, or (at your
  11  * option) any later version.
  12  */
  13
  14 #include <drm/drmP.h>
  15 #include <drm/drm_crtc_helper.h>
  16
  17 #include <drm/exynos_drm.h>
  18 #include "exynos_drm_drv.h"
  19 #include "exynos_drm_encoder.h"
  20
  21 #define to_exynos_connector(x)  container_of(x, struct exynos_drm_connector,\
  22                                 drm_connector)
  23
  24 struct exynos_drm_connector {
  25         struct drm_connector    drm_connector;
  26         uint32_t                encoder_id;
  27         struct exynos_drm_manager *manager;
  28         uint32_t                dpms;
  29 };
  30
  31 /* convert exynos_video_timings to drm_display_mode */
  32 static inline void
  33 convert_to_display_mode(struct drm_display_mode *mode,
  34                         struct exynos_drm_panel_info *panel)
  35 {
  36         struct fb_videomode *timing = &panel->timing;
  37         DRM_DEBUG_KMS("%s\n", __FILE__);
  38
  39         mode->clock = timing->pixclock / 1000;
  40         mode->vrefresh = timing->refresh;
  41
  42         mode->hdisplay = timing->xres;
  43         mode->hsync_start = mode->hdisplay + timing->right_margin;
  44         mode->hsync_end = mode->hsync_start + timing->hsync_len;
  45         mode->htotal = mode->hsync_end + timing->left_margin;
  46
  47         mode->vdisplay = timing->yres;
  48         mode->vsync_start = mode->vdisplay + timing->lower_margin;
  49         mode->vsync_end = mode->vsync_start + timing->vsync_len;
  50         mode->vtotal = mode->vsync_end + timing->upper_margin;
  51         mode->width_mm = panel->width_mm;
  52         mode->height_mm = panel->height_mm;
  53
  54         if (timing->vmode & FB_VMODE_INTERLACED)
  55                 mode->flags |= DRM_MODE_FLAG_INTERLACE;
  56
  57         if (timing->vmode & FB_VMODE_DOUBLE)
  58                 mode->flags |= DRM_MODE_FLAG_DBLSCAN;
  59 }
  60
  61 static int exynos_drm_connector_get_modes(struct drm_connector *connector)
  62 {
  63         struct exynos_drm_connector *exynos_connector =
  64                                         to_exynos_connector(connector);
  65         struct exynos_drm_manager *manager = exynos_connector->manager;
  66         struct exynos_drm_display_ops *display_ops = manager->display_ops;
  67         struct edid *edid = NULL;
  68         unsigned int count = 0;
  69         int ret;
  70
  71         DRM_DEBUG_KMS("%s\n", __FILE__);
  72
  73         if (!display_ops) {
  74                 DRM_DEBUG_KMS("display_ops is null.\n");
  75                 return 0;
  76         }
  77
  78         /*
  79          * if get_edid() exists then get_edid() callback of hdmi side
  80          * is called to get edid data through i2c interface else
  81          * get timing from the FIMD driver(display controller).
  82          *
  83          * P.S. in case of lcd panel, count is always 1 if success
  84          * because lcd panel has only one mode.
  85          */
  86         if (display_ops->get_edid) {
  87                 edid = display_ops->get_edid(manager->dev, connector);
  88                 if (IS_ERR_OR_NULL(edid)) {
  89                         ret = PTR_ERR(edid);
  90                         edid = NULL;
  91                         DRM_ERROR("Panel operation get_edid failed %d\n", ret);
  92                         goto out;
  93                 }
  94
  95                 count = drm_add_edid_modes(connector, edid);
  96                 if (!count) {
  97                         DRM_ERROR("Add edid modes failed %d\n", count);
  98                         goto out;
  99                 }
 100
 101                 drm_mode_connector_update_edid_property(connector, edid);
 102         } else {
 103                 struct exynos_drm_panel_info *panel;
 104                 struct drm_display_mode *mode = drm_mode_create(connector->dev);
 105                 if (!mode) {
 106                         DRM_ERROR("failed to create a new display mode.\n");
 107                         return 0;
 108                 }
 109
 110                 if (display_ops->get_panel)
 111                         panel = display_ops->get_panel(manager->dev);
 112                 else {
 113                         drm_mode_destroy(connector->dev, mode);
 114                         return 0;
 115                 }
 116
 117                 convert_to_display_mode(mode, panel);
 118                 connector->display_info.width_mm = mode->width_mm;
 119                 connector->display_info.height_mm = mode->height_mm;
 120
 121                 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
 122                 drm_mode_set_name(mode);
 123                 drm_mode_probed_add(connector, mode);
 124
 125                 count = 1;
 126         }
 127
 128 out:
 129         kfree(edid);
 130         return count;
 131 }
 132
 133 static int exynos_drm_connector_mode_valid(struct drm_connector *connector,
 134                                             struct drm_display_mode *mode)
 135 {
 136         struct exynos_drm_connector *exynos_connector =
 137                                         to_exynos_connector(connector);
 138         struct exynos_drm_manager *manager = exynos_connector->manager;
 139         struct exynos_drm_display_ops *display_ops = manager->display_ops;
 140         int ret = MODE_BAD;
 141
 142         DRM_DEBUG_KMS("%s\n", __FILE__);
 143
 144         if (display_ops && display_ops->check_mode)
 145                 if (!display_ops->check_mode(manager->dev, mode))
 146                         ret = MODE_OK;
 147
 148         return ret;
 149 }
 150
 151 struct drm_encoder *exynos_drm_best_encoder(struct drm_connector *connector)
 152 {
 153         struct drm_device *dev = connector->dev;
 154         struct exynos_drm_connector *exynos_connector =
 155                                         to_exynos_connector(connector);
 156         struct drm_mode_object *obj;
 157         struct drm_encoder *encoder;
 158
 159         DRM_DEBUG_KMS("%s\n", __FILE__);
 160
 161         obj = drm_mode_object_find(dev, exynos_connector->encoder_id,
 162                                    DRM_MODE_OBJECT_ENCODER);
 163         if (!obj) {
 164                 DRM_DEBUG_KMS("Unknown ENCODER ID %d\n",
 165                                 exynos_connector->encoder_id);
 166                 return NULL;
 167         }
 168
 169         encoder = obj_to_encoder(obj);
 170
 171         return encoder;
 172 }
 173
 174 static struct drm_connector_helper_funcs exynos_connector_helper_funcs = {
 175         .get_modes      = exynos_drm_connector_get_modes,
 176         .mode_valid     = exynos_drm_connector_mode_valid,
 177         .best_encoder   = exynos_drm_best_encoder,
 178 };
 179
 180 void exynos_drm_display_power(struct drm_connector *connector, int mode)
 181 {
 182         struct drm_encoder *encoder = exynos_drm_best_encoder(connector);
 183         struct exynos_drm_connector *exynos_connector;
 184         struct exynos_drm_manager *manager = exynos_drm_get_manager(encoder);
 185         struct exynos_drm_display_ops *display_ops = manager->display_ops;
 186
 187         exynos_connector = to_exynos_connector(connector);
 188
 189         if (exynos_connector->dpms == mode) {
 190                 DRM_DEBUG_KMS("desired dpms mode is same as previous one.\n");
 191                 return;
 192         }
 193
 194         if (display_ops && display_ops->power_on)
 195                 display_ops->power_on(manager->dev, mode);
 196
 197         exynos_connector->dpms = mode;
 198 }
 199
 200 static void exynos_drm_connector_dpms(struct drm_connector *connector,
 201                                         int mode)
 202 {
 203         DRM_DEBUG_KMS("%s\n", __FILE__);
 204
 205         /*
 206          * in case that drm_crtc_helper_set_mode() is called,
 207          * encoder/crtc->funcs->dpms() will be just returned
 208          * because they already were DRM_MODE_DPMS_ON so only
 209          * exynos_drm_display_power() will be called.
 210          */
 211         drm_helper_connector_dpms(connector, mode);
 212
 213         exynos_drm_display_power(connector, mode);
 214
 215 }
 216
 217 static int exynos_drm_connector_fill_modes(struct drm_connector *connector,
 218                                 unsigned int max_width, unsigned int max_height)
 219 {
 220         struct exynos_drm_connector *exynos_connector =
 221                                         to_exynos_connector(connector);
 222         struct exynos_drm_manager *manager = exynos_connector->manager;
 223         struct exynos_drm_manager_ops *ops = manager->ops;
 224         unsigned int width, height;
 225
 226         width = max_width;
 227         height = max_height;
 228
 229         /*
 230          * if specific driver want to find desired_mode using maxmum
 231          * resolution then get max width and height from that driver.
 232          */
 233         if (ops && ops->get_max_resol)
 234                 ops->get_max_resol(manager->dev, &width, &height);
 235
 236         return drm_helper_probe_single_connector_modes(connector, width,
 237                                                         height);
 238 }
 239
 240 /* get detection status of display device. */
 241 static enum drm_connector_status
 242 exynos_drm_connector_detect(struct drm_connector *connector, bool force)
 243 {
 244         struct exynos_drm_connector *exynos_connector =
 245                                         to_exynos_connector(connector);
 246         struct exynos_drm_manager *manager = exynos_connector->manager;
 247         struct exynos_drm_display_ops *display_ops =
 248                                         manager->display_ops;
 249         enum drm_connector_status status = connector_status_disconnected;
 250
 251         DRM_DEBUG_KMS("%s\n", __FILE__);
 252
 253         if (display_ops && display_ops->is_connected) {
 254                 if (display_ops->is_connected(manager->dev))
 255                         status = connector_status_connected;
 256                 else
 257                         status = connector_status_disconnected;
 258         }
 259
 260         return status;
 261 }
 262
 263 static void exynos_drm_connector_destroy(struct drm_connector *connector)
 264 {
 265         struct exynos_drm_connector *exynos_connector =
 266                 to_exynos_connector(connector);
 267
 268         DRM_DEBUG_KMS("%s\n", __FILE__);
 269
 270         drm_sysfs_connector_remove(connector);
 271         drm_connector_cleanup(connector);
 272         kfree(exynos_connector);
 273 }
 274
 275 static struct drm_connector_funcs exynos_connector_funcs = {
 276         .dpms           = exynos_drm_connector_dpms,
 277         .fill_modes     = exynos_drm_connector_fill_modes,
 278         .detect         = exynos_drm_connector_detect,
 279         .destroy        = exynos_drm_connector_destroy,
 280 };
 281
 282 struct drm_connector *exynos_drm_connector_create(struct drm_device *dev,
 283                                                    struct drm_encoder *encoder)
 284 {
 285         struct exynos_drm_connector *exynos_connector;
 286         struct exynos_drm_manager *manager = exynos_drm_get_manager(encoder);
 287         struct drm_connector *connector;
 288         int type;
 289         int err;
 290
 291         DRM_DEBUG_KMS("%s\n", __FILE__);
 292
 293         exynos_connector = kzalloc(sizeof(*exynos_connector), GFP_KERNEL);
 294         if (!exynos_connector) {
 295                 DRM_ERROR("failed to allocate connector\n");
 296                 return NULL;
 297         }
 298
 299         connector = &exynos_connector->drm_connector;
 300
 301         switch (manager->display_ops->type) {
 302         case EXYNOS_DISPLAY_TYPE_HDMI:
 303                 type = DRM_MODE_CONNECTOR_HDMIA;
 304                 connector->interlace_allowed = true;
 305                 connector->polled = DRM_CONNECTOR_POLL_HPD;
 306                 break;
 307         case EXYNOS_DISPLAY_TYPE_VIDI:
 308                 type = DRM_MODE_CONNECTOR_VIRTUAL;
 309                 connector->polled = DRM_CONNECTOR_POLL_HPD;
 310                 break;
 311         default:
 312                 type = DRM_MODE_CONNECTOR_Unknown;
 313                 break;
 314         }
 315
 316         drm_connector_init(dev, connector, &exynos_connector_funcs, type);
 317         drm_connector_helper_add(connector, &exynos_connector_helper_funcs);
 318
 319         err = drm_sysfs_connector_add(connector);
 320         if (err)
 321                 goto err_connector;
 322
 323         exynos_connector->encoder_id = encoder->base.id;
 324         exynos_connector->manager = manager;
 325         exynos_connector->dpms = DRM_MODE_DPMS_OFF;
 326         connector->dpms = DRM_MODE_DPMS_OFF;
 327         connector->encoder = encoder;
 328
 329         err = drm_mode_connector_attach_encoder(connector, encoder);
 330         if (err) {
 331                 DRM_ERROR("failed to attach a connector to a encoder\n");
 332                 goto err_sysfs;
 333         }
 334
 335         DRM_DEBUG_KMS("connector has been created\n");
 336
 337         return connector;
 338
 339 err_sysfs:
 340         drm_sysfs_connector_remove(connector);
 341 err_connector:
 342         drm_connector_cleanup(connector);
 343         kfree(exynos_connector);
 344         return NULL;
 345 }