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 #include "exynos_drm_connector.h"
  21
  22 #define to_exynos_connector(x)  container_of(x, struct exynos_drm_connector,\
  23                                 drm_connector)
  24
  25 struct exynos_drm_connector {
  26         struct drm_connector    drm_connector;
  27         uint32_t                encoder_id;
  28         struct exynos_drm_manager *manager;
  29 };
  30
  31 static int exynos_drm_connector_get_modes(struct drm_connector *connector)
  32 {
  33         struct exynos_drm_connector *exynos_connector =
  34                                         to_exynos_connector(connector);
  35         struct exynos_drm_manager *manager = exynos_connector->manager;
  36         struct exynos_drm_display_ops *display_ops = manager->display_ops;
  37         struct edid *edid = NULL;
  38         unsigned int count = 0;
  39         int ret;
  40
  41         if (!display_ops) {
  42                 DRM_DEBUG_KMS("display_ops is null.\n");
  43                 return 0;
  44         }
  45
  46         /*
  47          * if get_edid() exists then get_edid() callback of hdmi side
  48          * is called to get edid data through i2c interface else
  49          * get timing from the FIMD driver(display controller).
  50          *
  51          * P.S. in case of lcd panel, count is always 1 if success
  52          * because lcd panel has only one mode.
  53          */
  54         if (display_ops->get_edid) {
  55                 edid = display_ops->get_edid(manager->dev, connector);
  56                 if (IS_ERR_OR_NULL(edid)) {
  57                         ret = PTR_ERR(edid);
  58                         edid = NULL;
  59                         DRM_ERROR("Panel operation get_edid failed %d\n", ret);
  60                         goto out;
  61                 }
  62
  63                 count = drm_add_edid_modes(connector, edid);
  64                 if (!count) {
  65                         DRM_ERROR("Add edid modes failed %d\n", count);
  66                         goto out;
  67                 }
  68
  69                 drm_mode_connector_update_edid_property(connector, edid);
  70         } else {
  71                 struct exynos_drm_panel_info *panel;
  72                 struct drm_display_mode *mode = drm_mode_create(connector->dev);
  73                 if (!mode) {
  74                         DRM_ERROR("failed to create a new display mode.\n");
  75                         return 0;
  76                 }
  77
  78                 if (display_ops->get_panel)
  79                         panel = display_ops->get_panel(manager->dev);
  80                 else {
  81                         drm_mode_destroy(connector->dev, mode);
  82                         return 0;
  83                 }
  84
  85                 drm_display_mode_from_videomode(&panel->vm, mode);
  86                 mode->width_mm = panel->width_mm;
  87                 mode->height_mm = panel->height_mm;
  88                 connector->display_info.width_mm = mode->width_mm;
  89                 connector->display_info.height_mm = mode->height_mm;
  90
  91                 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
  92                 drm_mode_set_name(mode);
  93                 drm_mode_probed_add(connector, mode);
  94
  95                 count = 1;
  96         }
  97
  98 out:
  99         kfree(edid);
 100         return count;
 101 }
 102
 103 static int exynos_drm_connector_mode_valid(struct drm_connector *connector,
 104                                             struct drm_display_mode *mode)
 105 {
 106         struct exynos_drm_connector *exynos_connector =
 107                                         to_exynos_connector(connector);
 108         struct exynos_drm_manager *manager = exynos_connector->manager;
 109         struct exynos_drm_display_ops *display_ops = manager->display_ops;
 110         int ret = MODE_BAD;
 111
 112         DRM_DEBUG_KMS("%s\n", __FILE__);
 113
 114         if (display_ops && display_ops->check_mode)
 115                 if (!display_ops->check_mode(manager->dev, mode))
 116                         ret = MODE_OK;
 117
 118         return ret;
 119 }
 120
 121 static struct drm_encoder *exynos_drm_best_encoder(
 122                 struct drm_connector *connector)
 123 {
 124         struct drm_device *dev = connector->dev;
 125         struct exynos_drm_connector *exynos_connector =
 126                                         to_exynos_connector(connector);
 127         struct drm_mode_object *obj;
 128         struct drm_encoder *encoder;
 129
 130         obj = drm_mode_object_find(dev, exynos_connector->encoder_id,
 131                                    DRM_MODE_OBJECT_ENCODER);
 132         if (!obj) {
 133                 DRM_DEBUG_KMS("Unknown ENCODER ID %d\n",
 134                                 exynos_connector->encoder_id);
 135                 return NULL;
 136         }
 137
 138         encoder = obj_to_encoder(obj);
 139
 140         return encoder;
 141 }
 142
 143 static struct drm_connector_helper_funcs exynos_connector_helper_funcs = {
 144         .get_modes      = exynos_drm_connector_get_modes,
 145         .mode_valid     = exynos_drm_connector_mode_valid,
 146         .best_encoder   = exynos_drm_best_encoder,
 147 };
 148
 149 static int exynos_drm_connector_fill_modes(struct drm_connector *connector,
 150                                 unsigned int max_width, unsigned int max_height)
 151 {
 152         struct exynos_drm_connector *exynos_connector =
 153                                         to_exynos_connector(connector);
 154         struct exynos_drm_manager *manager = exynos_connector->manager;
 155         struct exynos_drm_manager_ops *ops = manager->ops;
 156         unsigned int width, height;
 157
 158         width = max_width;
 159         height = max_height;
 160
 161         /*
 162          * if specific driver want to find desired_mode using maxmum
 163          * resolution then get max width and height from that driver.
 164          */
 165         if (ops && ops->get_max_resol)
 166                 ops->get_max_resol(manager, &width, &height);
 167
 168         return drm_helper_probe_single_connector_modes(connector, width,
 169                                                         height);
 170 }
 171
 172 /* get detection status of display device. */
 173 static enum drm_connector_status
 174 exynos_drm_connector_detect(struct drm_connector *connector, bool force)
 175 {
 176         struct exynos_drm_connector *exynos_connector =
 177                                         to_exynos_connector(connector);
 178         struct exynos_drm_manager *manager = exynos_connector->manager;
 179         struct exynos_drm_display_ops *display_ops =
 180                                         manager->display_ops;
 181         enum drm_connector_status status = connector_status_disconnected;
 182
 183         if (display_ops && display_ops->is_connected) {
 184                 if (display_ops->is_connected(manager->dev))
 185                         status = connector_status_connected;
 186                 else
 187                         status = connector_status_disconnected;
 188         }
 189
 190         return status;
 191 }
 192
 193 static void exynos_drm_connector_destroy(struct drm_connector *connector)
 194 {
 195         struct exynos_drm_connector *exynos_connector =
 196                 to_exynos_connector(connector);
 197
 198         drm_sysfs_connector_remove(connector);
 199         drm_connector_cleanup(connector);
 200         kfree(exynos_connector);
 201 }
 202
 203 static struct drm_connector_funcs exynos_connector_funcs = {
 204         .dpms           = drm_helper_connector_dpms,
 205         .fill_modes     = exynos_drm_connector_fill_modes,
 206         .detect         = exynos_drm_connector_detect,
 207         .destroy        = exynos_drm_connector_destroy,
 208 };
 209
 210 struct drm_connector *exynos_drm_connector_create(struct drm_device *dev,
 211                                                    struct drm_encoder *encoder)
 212 {
 213         struct exynos_drm_connector *exynos_connector;
 214         struct exynos_drm_manager *manager = exynos_drm_get_manager(encoder);
 215         struct drm_connector *connector;
 216         int type;
 217         int err;
 218
 219         exynos_connector = kzalloc(sizeof(*exynos_connector), GFP_KERNEL);
 220         if (!exynos_connector)
 221                 return NULL;
 222
 223         connector = &exynos_connector->drm_connector;
 224
 225         switch (manager->display_ops->type) {
 226         case EXYNOS_DISPLAY_TYPE_HDMI:
 227                 type = DRM_MODE_CONNECTOR_HDMIA;
 228                 connector->interlace_allowed = true;
 229                 connector->polled = DRM_CONNECTOR_POLL_HPD;
 230                 break;
 231         case EXYNOS_DISPLAY_TYPE_VIDI:
 232                 type = DRM_MODE_CONNECTOR_VIRTUAL;
 233                 connector->polled = DRM_CONNECTOR_POLL_HPD;
 234                 break;
 235         default:
 236                 type = DRM_MODE_CONNECTOR_Unknown;
 237                 break;
 238         }
 239
 240         drm_connector_init(dev, connector, &exynos_connector_funcs, type);
 241         drm_connector_helper_add(connector, &exynos_connector_helper_funcs);
 242
 243         err = drm_sysfs_connector_add(connector);
 244         if (err)
 245                 goto err_connector;
 246
 247         exynos_connector->encoder_id = encoder->base.id;
 248         exynos_connector->manager = manager;
 249         connector->dpms = DRM_MODE_DPMS_OFF;
 250         connector->encoder = encoder;
 251
 252         err = drm_mode_connector_attach_encoder(connector, encoder);
 253         if (err) {
 254                 DRM_ERROR("failed to attach a connector to a encoder\n");
 255                 goto err_sysfs;
 256         }
 257
 258         DRM_DEBUG_KMS("connector has been created\n");
 259
 260         return connector;
 261
 262 err_sysfs:
 263         drm_sysfs_connector_remove(connector);
 264 err_connector:
 265         drm_connector_cleanup(connector);
 266         kfree(exynos_connector);
 267         return NULL;
 268 }