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         uint32_t                dpms;
  30 };
  31
  32 static int exynos_drm_connector_get_modes(struct drm_connector *connector)
  33 {
  34         struct exynos_drm_connector *exynos_connector =
  35                                         to_exynos_connector(connector);
  36         struct exynos_drm_manager *manager = exynos_connector->manager;
  37         struct exynos_drm_display_ops *display_ops = manager->display_ops;
  38         struct edid *edid = NULL;
  39         unsigned int count = 0;
  40         int ret;
  41
  42         if (!display_ops) {
  43                 DRM_DEBUG_KMS("display_ops is null.\n");
  44                 return 0;
  45         }
  46
  47         /*
  48          * if get_edid() exists then get_edid() callback of hdmi side
  49          * is called to get edid data through i2c interface else
  50          * get timing from the FIMD driver(display controller).
  51          *
  52          * P.S. in case of lcd panel, count is always 1 if success
  53          * because lcd panel has only one mode.
  54          */
  55         if (display_ops->get_edid) {
  56                 edid = display_ops->get_edid(manager->dev, connector);
  57                 if (IS_ERR_OR_NULL(edid)) {
  58                         ret = PTR_ERR(edid);
  59                         edid = NULL;
  60                         DRM_ERROR("Panel operation get_edid failed %d\n", ret);
  61                         goto out;
  62                 }
  63
  64                 count = drm_add_edid_modes(connector, edid);
  65                 if (!count) {
  66                         DRM_ERROR("Add edid modes failed %d\n", count);
  67                         goto out;
  68                 }
  69
  70                 drm_mode_connector_update_edid_property(connector, edid);
  71         } else {
  72                 struct exynos_drm_panel_info *panel;
  73                 struct drm_display_mode *mode = drm_mode_create(connector->dev);
  74                 if (!mode) {
  75                         DRM_ERROR("failed to create a new display mode.\n");
  76                         return 0;
  77                 }
  78
  79                 if (display_ops->get_panel)
  80                         panel = display_ops->get_panel(manager->dev);
  81                 else {
  82                         drm_mode_destroy(connector->dev, mode);
  83                         return 0;
  84                 }
  85
  86                 drm_display_mode_from_videomode(&panel->vm, mode);
  87                 mode->width_mm = panel->width_mm;
  88                 mode->height_mm = panel->height_mm;
  89                 connector->display_info.width_mm = mode->width_mm;
  90                 connector->display_info.height_mm = mode->height_mm;
  91
  92                 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
  93                 drm_mode_set_name(mode);
  94                 drm_mode_probed_add(connector, mode);
  95
  96                 count = 1;
  97         }
  98
  99 out:
 100         kfree(edid);
 101         return count;
 102 }
 103
 104 static int exynos_drm_connector_mode_valid(struct drm_connector *connector,
 105                                             struct drm_display_mode *mode)
 106 {
 107         struct exynos_drm_connector *exynos_connector =
 108                                         to_exynos_connector(connector);
 109         struct exynos_drm_manager *manager = exynos_connector->manager;
 110         struct exynos_drm_display_ops *display_ops = manager->display_ops;
 111         int ret = MODE_BAD;
 112
 113         DRM_DEBUG_KMS("%s\n", __FILE__);
 114
 115         if (display_ops && display_ops->check_mode)
 116                 if (!display_ops->check_mode(manager->dev, mode))
 117                         ret = MODE_OK;
 118
 119         return ret;
 120 }
 121
 122 struct drm_encoder *exynos_drm_best_encoder(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 void exynos_drm_display_power(struct drm_connector *connector, int mode)
 150 {
 151         struct drm_encoder *encoder = exynos_drm_best_encoder(connector);
 152         struct exynos_drm_connector *exynos_connector;
 153         struct exynos_drm_manager *manager = exynos_drm_get_manager(encoder);
 154         struct exynos_drm_display_ops *display_ops = manager->display_ops;
 155
 156         exynos_connector = to_exynos_connector(connector);
 157
 158         if (exynos_connector->dpms == mode) {
 159                 DRM_DEBUG_KMS("desired dpms mode is same as previous one.\n");
 160                 return;
 161         }
 162
 163         if (display_ops && display_ops->power_on)
 164                 display_ops->power_on(manager->dev, mode);
 165
 166         exynos_connector->dpms = mode;
 167 }
 168
 169 static void exynos_drm_connector_dpms(struct drm_connector *connector,
 170                                         int mode)
 171 {
 172         /*
 173          * in case that drm_crtc_helper_set_mode() is called,
 174          * encoder/crtc->funcs->dpms() will be just returned
 175          * because they already were DRM_MODE_DPMS_ON so only
 176          * exynos_drm_display_power() will be called.
 177          */
 178         drm_helper_connector_dpms(connector, mode);
 179
 180         exynos_drm_display_power(connector, mode);
 181
 182 }
 183
 184 static int exynos_drm_connector_fill_modes(struct drm_connector *connector,
 185                                 unsigned int max_width, unsigned int max_height)
 186 {
 187         struct exynos_drm_connector *exynos_connector =
 188                                         to_exynos_connector(connector);
 189         struct exynos_drm_manager *manager = exynos_connector->manager;
 190         struct exynos_drm_manager_ops *ops = manager->ops;
 191         unsigned int width, height;
 192
 193         width = max_width;
 194         height = max_height;
 195
 196         /*
 197          * if specific driver want to find desired_mode using maxmum
 198          * resolution then get max width and height from that driver.
 199          */
 200         if (ops && ops->get_max_resol)
 201                 ops->get_max_resol(manager, &width, &height);
 202
 203         return drm_helper_probe_single_connector_modes(connector, width,
 204                                                         height);
 205 }
 206
 207 /* get detection status of display device. */
 208 static enum drm_connector_status
 209 exynos_drm_connector_detect(struct drm_connector *connector, bool force)
 210 {
 211         struct exynos_drm_connector *exynos_connector =
 212                                         to_exynos_connector(connector);
 213         struct exynos_drm_manager *manager = exynos_connector->manager;
 214         struct exynos_drm_display_ops *display_ops =
 215                                         manager->display_ops;
 216         enum drm_connector_status status = connector_status_disconnected;
 217
 218         if (display_ops && display_ops->is_connected) {
 219                 if (display_ops->is_connected(manager->dev))
 220                         status = connector_status_connected;
 221                 else
 222                         status = connector_status_disconnected;
 223         }
 224
 225         return status;
 226 }
 227
 228 static void exynos_drm_connector_destroy(struct drm_connector *connector)
 229 {
 230         struct exynos_drm_connector *exynos_connector =
 231                 to_exynos_connector(connector);
 232
 233         drm_sysfs_connector_remove(connector);
 234         drm_connector_cleanup(connector);
 235         kfree(exynos_connector);
 236 }
 237
 238 static struct drm_connector_funcs exynos_connector_funcs = {
 239         .dpms           = exynos_drm_connector_dpms,
 240         .fill_modes     = exynos_drm_connector_fill_modes,
 241         .detect         = exynos_drm_connector_detect,
 242         .destroy        = exynos_drm_connector_destroy,
 243 };
 244
 245 struct drm_connector *exynos_drm_connector_create(struct drm_device *dev,
 246                                                    struct drm_encoder *encoder)
 247 {
 248         struct exynos_drm_connector *exynos_connector;
 249         struct exynos_drm_manager *manager = exynos_drm_get_manager(encoder);
 250         struct drm_connector *connector;
 251         int type;
 252         int err;
 253
 254         exynos_connector = kzalloc(sizeof(*exynos_connector), GFP_KERNEL);
 255         if (!exynos_connector)
 256                 return NULL;
 257
 258         connector = &exynos_connector->drm_connector;
 259
 260         switch (manager->display_ops->type) {
 261         case EXYNOS_DISPLAY_TYPE_HDMI:
 262                 type = DRM_MODE_CONNECTOR_HDMIA;
 263                 connector->interlace_allowed = true;
 264                 connector->polled = DRM_CONNECTOR_POLL_HPD;
 265                 break;
 266         case EXYNOS_DISPLAY_TYPE_VIDI:
 267                 type = DRM_MODE_CONNECTOR_VIRTUAL;
 268                 connector->polled = DRM_CONNECTOR_POLL_HPD;
 269                 break;
 270         default:
 271                 type = DRM_MODE_CONNECTOR_Unknown;
 272                 break;
 273         }
 274
 275         drm_connector_init(dev, connector, &exynos_connector_funcs, type);
 276         drm_connector_helper_add(connector, &exynos_connector_helper_funcs);
 277
 278         err = drm_sysfs_connector_add(connector);
 279         if (err)
 280                 goto err_connector;
 281
 282         exynos_connector->encoder_id = encoder->base.id;
 283         exynos_connector->manager = manager;
 284         exynos_connector->dpms = DRM_MODE_DPMS_OFF;
 285         connector->dpms = DRM_MODE_DPMS_OFF;
 286         connector->encoder = encoder;
 287
 288         err = drm_mode_connector_attach_encoder(connector, encoder);
 289         if (err) {
 290                 DRM_ERROR("failed to attach a connector to a encoder\n");
 291                 goto err_sysfs;
 292         }
 293
 294         DRM_DEBUG_KMS("connector has been created\n");
 295
 296         return connector;
 297
 298 err_sysfs:
 299         drm_sysfs_connector_remove(connector);
 300 err_connector:
 301         drm_connector_cleanup(connector);
 302         kfree(exynos_connector);
 303         return NULL;
 304 }