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