drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c

   1 /*
   2  * Copyright (C) 2014 Traphandler
   3  * Copyright (C) 2014 Free Electrons
   4  * Copyright (C) 2014 Atmel
   5  *
   6  * Author: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
   7  * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU General Public License version 2 as published by
  11  * the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but WITHOUT
  14  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  16  * more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along with
  19  * this program.  If not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #include <linux/of_graph.h>
  23
  24 #include <drm/drmP.h>
  25 #include <drm/drm_of.h>
  26
  27 #include "atmel_hlcdc_dc.h"
  28
  29 /**
  30  * Atmel HLCDC RGB connector structure
  31  *
  32  * This structure stores RGB slave device information.
  33  *
  34  * @connector: DRM connector
  35  * @encoder: DRM encoder
  36  * @dc: pointer to the atmel_hlcdc_dc structure
  37  * @panel: panel connected on the RGB output
  38  */
  39 struct atmel_hlcdc_rgb_output {
  40         struct drm_connector connector;
  41         struct drm_encoder encoder;
  42         struct atmel_hlcdc_dc *dc;
  43         struct drm_panel *panel;
  44 };
  45
  46 static inline struct atmel_hlcdc_rgb_output *
  47 drm_connector_to_atmel_hlcdc_rgb_output(struct drm_connector *connector)
  48 {
  49         return container_of(connector, struct atmel_hlcdc_rgb_output,
  50                             connector);
  51 }
  52
  53 static inline struct atmel_hlcdc_rgb_output *
  54 drm_encoder_to_atmel_hlcdc_rgb_output(struct drm_encoder *encoder)
  55 {
  56         return container_of(encoder, struct atmel_hlcdc_rgb_output, encoder);
  57 }
  58
  59 static void atmel_hlcdc_rgb_encoder_enable(struct drm_encoder *encoder)
  60 {
  61         struct atmel_hlcdc_rgb_output *rgb =
  62                         drm_encoder_to_atmel_hlcdc_rgb_output(encoder);
  63
  64         if (rgb->panel) {
  65                 drm_panel_prepare(rgb->panel);
  66                 drm_panel_enable(rgb->panel);
  67         }
  68 }
  69
  70 static void atmel_hlcdc_rgb_encoder_disable(struct drm_encoder *encoder)
  71 {
  72         struct atmel_hlcdc_rgb_output *rgb =
  73                         drm_encoder_to_atmel_hlcdc_rgb_output(encoder);
  74
  75         if (rgb->panel) {
  76                 drm_panel_disable(rgb->panel);
  77                 drm_panel_unprepare(rgb->panel);
  78         }
  79 }
  80
  81 static const struct drm_encoder_helper_funcs atmel_hlcdc_panel_encoder_helper_funcs = {
  82         .disable = atmel_hlcdc_rgb_encoder_disable,
  83         .enable = atmel_hlcdc_rgb_encoder_enable,
  84 };
  85
  86 static void atmel_hlcdc_rgb_encoder_destroy(struct drm_encoder *encoder)
  87 {
  88         drm_encoder_cleanup(encoder);
  89         memset(encoder, 0, sizeof(*encoder));
  90 }
  91
  92 static const struct drm_encoder_funcs atmel_hlcdc_panel_encoder_funcs = {
  93         .destroy = atmel_hlcdc_rgb_encoder_destroy,
  94 };
  95
  96 static int atmel_hlcdc_panel_get_modes(struct drm_connector *connector)
  97 {
  98         struct atmel_hlcdc_rgb_output *rgb =
  99                         drm_connector_to_atmel_hlcdc_rgb_output(connector);
 100
 101         if (rgb->panel)
 102                 return rgb->panel->funcs->get_modes(rgb->panel);
 103
 104         return 0;
 105 }
 106
 107 static int atmel_hlcdc_rgb_mode_valid(struct drm_connector *connector,
 108                                       struct drm_display_mode *mode)
 109 {
 110         struct atmel_hlcdc_rgb_output *rgb =
 111                         drm_connector_to_atmel_hlcdc_rgb_output(connector);
 112
 113         return atmel_hlcdc_dc_mode_valid(rgb->dc, mode);
 114 }
 115
 116 static const struct drm_connector_helper_funcs atmel_hlcdc_panel_connector_helper_funcs = {
 117         .get_modes = atmel_hlcdc_panel_get_modes,
 118         .mode_valid = atmel_hlcdc_rgb_mode_valid,
 119 };
 120
 121 static enum drm_connector_status
 122 atmel_hlcdc_panel_connector_detect(struct drm_connector *connector, bool force)
 123 {
 124         struct atmel_hlcdc_rgb_output *rgb =
 125                         drm_connector_to_atmel_hlcdc_rgb_output(connector);
 126
 127         if (rgb->panel)
 128                 return connector_status_connected;
 129
 130         return connector_status_disconnected;
 131 }
 132
 133 static void
 134 atmel_hlcdc_panel_connector_destroy(struct drm_connector *connector)
 135 {
 136         struct atmel_hlcdc_rgb_output *rgb =
 137                         drm_connector_to_atmel_hlcdc_rgb_output(connector);
 138
 139         if (rgb->panel)
 140                 drm_panel_detach(rgb->panel);
 141
 142         drm_connector_cleanup(connector);
 143 }
 144
 145 static const struct drm_connector_funcs atmel_hlcdc_panel_connector_funcs = {
 146         .dpms = drm_atomic_helper_connector_dpms,
 147         .detect = atmel_hlcdc_panel_connector_detect,
 148         .fill_modes = drm_helper_probe_single_connector_modes,
 149         .destroy = atmel_hlcdc_panel_connector_destroy,
 150         .reset = drm_atomic_helper_connector_reset,
 151         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 152         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 153 };
 154
 155 static int atmel_hlcdc_attach_endpoint(struct drm_device *dev,
 156                                        const struct device_node *np)
 157 {
 158         struct atmel_hlcdc_dc *dc = dev->dev_private;
 159         struct atmel_hlcdc_rgb_output *output;
 160         struct drm_panel *panel;
 161         struct drm_bridge *bridge;
 162         int ret;
 163
 164         output = devm_kzalloc(dev->dev, sizeof(*output), GFP_KERNEL);
 165         if (!output)
 166                 return -EINVAL;
 167
 168         output->dc = dc;
 169
 170         drm_encoder_helper_add(&output->encoder,
 171                                &atmel_hlcdc_panel_encoder_helper_funcs);
 172         ret = drm_encoder_init(dev, &output->encoder,
 173                                &atmel_hlcdc_panel_encoder_funcs,
 174                                DRM_MODE_ENCODER_NONE, NULL);
 175         if (ret)
 176                 return ret;
 177
 178         output->encoder.possible_crtcs = 0x1;
 179
 180         ret = drm_of_find_panel_or_bridge(np, 0, 0, &panel, &bridge);
 181         if (ret)
 182                 return ret;
 183
 184         if (panel) {
 185                 output->connector.dpms = DRM_MODE_DPMS_OFF;
 186                 output->connector.polled = DRM_CONNECTOR_POLL_CONNECT;
 187                 drm_connector_helper_add(&output->connector,
 188                                 &atmel_hlcdc_panel_connector_helper_funcs);
 189                 ret = drm_connector_init(dev, &output->connector,
 190                                          &atmel_hlcdc_panel_connector_funcs,
 191                                          DRM_MODE_CONNECTOR_Unknown);
 192                 if (ret)
 193                         goto err_encoder_cleanup;
 194
 195                 drm_mode_connector_attach_encoder(&output->connector,
 196                                                   &output->encoder);
 197
 198                 ret = drm_panel_attach(panel, &output->connector);
 199                 if (ret) {
 200                         drm_connector_cleanup(&output->connector);
 201                         goto err_encoder_cleanup;
 202                 }
 203
 204                 output->panel = panel;
 205
 206                 return 0;
 207         }
 208
 209         if (bridge) {
 210                 ret = drm_bridge_attach(&output->encoder, bridge, NULL);
 211                 if (!ret)
 212                         return 0;
 213         }
 214
 215 err_encoder_cleanup:
 216         drm_encoder_cleanup(&output->encoder);
 217
 218         return ret;
 219 }
 220
 221 int atmel_hlcdc_create_outputs(struct drm_device *dev)
 222 {
 223         struct device_node *remote;
 224         int ret = -ENODEV;
 225         int endpoint = 0;
 226
 227         while (true) {
 228                 /* Loop thru possible multiple connections to the output */
 229                 remote = of_graph_get_remote_node(dev->dev->of_node, 0,
 230                                                   endpoint++);
 231                 if (!remote)
 232                         break;
 233
 234                 ret = atmel_hlcdc_attach_endpoint(dev, remote);
 235                 of_node_put(remote);
 236                 if (ret)
 237                         return ret;
 238         }
 239
 240         return ret;
 241 }