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         return drm_encoder_find(dev, exynos_connector->encoder_id);
 121 }
 122
 123 static struct drm_connector_helper_funcs exynos_connector_helper_funcs = {
 124         .get_modes      = exynos_drm_connector_get_modes,
 125         .mode_valid     = exynos_drm_connector_mode_valid,
 126         .best_encoder   = exynos_drm_best_encoder,
 127 };
 128
 129 static int exynos_drm_connector_fill_modes(struct drm_connector *connector,
 130                                 unsigned int max_width, unsigned int max_height)
 131 {
 132         struct exynos_drm_connector *exynos_connector =
 133                                         to_exynos_connector(connector);
 134         struct exynos_drm_display *display = exynos_connector->display;
 135         unsigned int width, height;
 136
 137         width = max_width;
 138         height = max_height;
 139
 140         /*
 141          * if specific driver want to find desired_mode using maxmum
 142          * resolution then get max width and height from that driver.
 143          */
 144         if (display->ops->get_max_resol)
 145                 display->ops->get_max_resol(display, &width, &height);
 146
 147         return drm_helper_probe_single_connector_modes(connector, width,
 148                                                         height);
 149 }
 150
 151 /* get detection status of display device. */
 152 static enum drm_connector_status
 153 exynos_drm_connector_detect(struct drm_connector *connector, bool force)
 154 {
 155         struct exynos_drm_connector *exynos_connector =
 156                                         to_exynos_connector(connector);
 157         struct exynos_drm_display *display = exynos_connector->display;
 158         enum drm_connector_status status = connector_status_disconnected;
 159
 160         if (display->ops->is_connected) {
 161                 if (display->ops->is_connected(display))
 162                         status = connector_status_connected;
 163                 else
 164                         status = connector_status_disconnected;
 165         }
 166
 167         return status;
 168 }
 169
 170 static void exynos_drm_connector_destroy(struct drm_connector *connector)
 171 {
 172         struct exynos_drm_connector *exynos_connector =
 173                 to_exynos_connector(connector);
 174
 175         drm_connector_unregister(connector);
 176         drm_connector_cleanup(connector);
 177         kfree(exynos_connector);
 178 }
 179
 180 static struct drm_connector_funcs exynos_connector_funcs = {
 181         .dpms           = drm_helper_connector_dpms,
 182         .fill_modes     = exynos_drm_connector_fill_modes,
 183         .detect         = exynos_drm_connector_detect,
 184         .destroy        = exynos_drm_connector_destroy,
 185 };
 186
 187 struct drm_connector *exynos_drm_connector_create(struct drm_device *dev,
 188                                                    struct drm_encoder *encoder)
 189 {
 190         struct exynos_drm_connector *exynos_connector;
 191         struct exynos_drm_display *display = exynos_drm_get_display(encoder);
 192         struct drm_connector *connector;
 193         int type;
 194         int err;
 195
 196         exynos_connector = kzalloc(sizeof(*exynos_connector), GFP_KERNEL);
 197         if (!exynos_connector)
 198                 return NULL;
 199
 200         connector = &exynos_connector->drm_connector;
 201
 202         switch (display->type) {
 203         case EXYNOS_DISPLAY_TYPE_HDMI:
 204                 type = DRM_MODE_CONNECTOR_HDMIA;
 205                 connector->interlace_allowed = true;
 206                 connector->polled = DRM_CONNECTOR_POLL_HPD;
 207                 break;
 208         case EXYNOS_DISPLAY_TYPE_VIDI:
 209                 type = DRM_MODE_CONNECTOR_VIRTUAL;
 210                 connector->polled = DRM_CONNECTOR_POLL_HPD;
 211                 break;
 212         default:
 213                 type = DRM_MODE_CONNECTOR_Unknown;
 214                 break;
 215         }
 216
 217         drm_connector_init(dev, connector, &exynos_connector_funcs, type);
 218         drm_connector_helper_add(connector, &exynos_connector_helper_funcs);
 219
 220         err = drm_connector_register(connector);
 221         if (err)
 222                 goto err_connector;
 223
 224         exynos_connector->encoder_id = encoder->base.id;
 225         exynos_connector->display = display;
 226         connector->dpms = DRM_MODE_DPMS_OFF;
 227         connector->encoder = encoder;
 228
 229         err = drm_mode_connector_attach_encoder(connector, encoder);
 230         if (err) {
 231                 DRM_ERROR("failed to attach a connector to a encoder\n");
 232                 goto err_sysfs;
 233         }
 234
 235         DRM_DEBUG_KMS("connector has been created\n");
 236
 237         return connector;
 238
 239 err_sysfs:
 240         drm_connector_unregister(connector);
 241 err_connector:
 242         drm_connector_cleanup(connector);
 243         kfree(exynos_connector);
 244         return NULL;
 245 }