kernel/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_panel.h>
  26
  27 #include "atmel_hlcdc_dc.h"
  28
  29 /**
  30  * Atmel HLCDC RGB output mode
  31  */
  32 enum atmel_hlcdc_connector_rgb_mode {
  33         ATMEL_HLCDC_CONNECTOR_RGB444,
  34         ATMEL_HLCDC_CONNECTOR_RGB565,
  35         ATMEL_HLCDC_CONNECTOR_RGB666,
  36         ATMEL_HLCDC_CONNECTOR_RGB888,
  37 };
  38
  39 /**
  40  * Atmel HLCDC RGB connector structure
  41  *
  42  * This structure stores RGB slave device information.
  43  *
  44  * @connector: DRM connector
  45  * @encoder: DRM encoder
  46  * @dc: pointer to the atmel_hlcdc_dc structure
  47  * @dpms: current DPMS mode
  48  */
  49 struct atmel_hlcdc_rgb_output {
  50         struct drm_connector connector;
  51         struct drm_encoder encoder;
  52         struct atmel_hlcdc_dc *dc;
  53         int dpms;
  54 };
  55
  56 static inline struct atmel_hlcdc_rgb_output *
  57 drm_connector_to_atmel_hlcdc_rgb_output(struct drm_connector *connector)
  58 {
  59         return container_of(connector, struct atmel_hlcdc_rgb_output,
  60                             connector);
  61 }
  62
  63 static inline struct atmel_hlcdc_rgb_output *
  64 drm_encoder_to_atmel_hlcdc_rgb_output(struct drm_encoder *encoder)
  65 {
  66         return container_of(encoder, struct atmel_hlcdc_rgb_output, encoder);
  67 }
  68
  69 /**
  70  * Atmel HLCDC Panel device structure
  71  *
  72  * This structure is specialization of the slave device structure to
  73  * interface with drm panels.
  74  *
  75  * @base: base slave device fields
  76  * @panel: drm panel attached to this slave device
  77  */
  78 struct atmel_hlcdc_panel {
  79         struct atmel_hlcdc_rgb_output base;
  80         struct drm_panel *panel;
  81 };
  82
  83 static inline struct atmel_hlcdc_panel *
  84 atmel_hlcdc_rgb_output_to_panel(struct atmel_hlcdc_rgb_output *output)
  85 {
  86         return container_of(output, struct atmel_hlcdc_panel, base);
  87 }
  88
  89 static void atmel_hlcdc_panel_encoder_enable(struct drm_encoder *encoder)
  90 {
  91         struct atmel_hlcdc_rgb_output *rgb =
  92                         drm_encoder_to_atmel_hlcdc_rgb_output(encoder);
  93         struct atmel_hlcdc_panel *panel = atmel_hlcdc_rgb_output_to_panel(rgb);
  94
  95         drm_panel_enable(panel->panel);
  96 }
  97
  98 static void atmel_hlcdc_panel_encoder_disable(struct drm_encoder *encoder)
  99 {
 100         struct atmel_hlcdc_rgb_output *rgb =
 101                         drm_encoder_to_atmel_hlcdc_rgb_output(encoder);
 102         struct atmel_hlcdc_panel *panel = atmel_hlcdc_rgb_output_to_panel(rgb);
 103
 104         drm_panel_disable(panel->panel);
 105 }
 106
 107 static bool
 108 atmel_hlcdc_panel_encoder_mode_fixup(struct drm_encoder *encoder,
 109                                      const struct drm_display_mode *mode,
 110                                      struct drm_display_mode *adjusted)
 111 {
 112         return true;
 113 }
 114
 115 static void
 116 atmel_hlcdc_rgb_encoder_mode_set(struct drm_encoder *encoder,
 117                                  struct drm_display_mode *mode,
 118                                  struct drm_display_mode *adjusted)
 119 {
 120         struct atmel_hlcdc_rgb_output *rgb =
 121                         drm_encoder_to_atmel_hlcdc_rgb_output(encoder);
 122         struct drm_display_info *info = &rgb->connector.display_info;
 123         unsigned int cfg;
 124
 125         cfg = 0;
 126
 127         if (info->num_bus_formats) {
 128                 switch (info->bus_formats[0]) {
 129                 case MEDIA_BUS_FMT_RGB565_1X16:
 130                         cfg |= ATMEL_HLCDC_CONNECTOR_RGB565 << 8;
 131                         break;
 132                 case MEDIA_BUS_FMT_RGB666_1X18:
 133                         cfg |= ATMEL_HLCDC_CONNECTOR_RGB666 << 8;
 134                         break;
 135                 case MEDIA_BUS_FMT_RGB888_1X24:
 136                         cfg |= ATMEL_HLCDC_CONNECTOR_RGB888 << 8;
 137                         break;
 138                 case MEDIA_BUS_FMT_RGB444_1X12:
 139                 default:
 140                         break;
 141                 }
 142         }
 143
 144         regmap_update_bits(rgb->dc->hlcdc->regmap, ATMEL_HLCDC_CFG(5),
 145                            ATMEL_HLCDC_MODE_MASK,
 146                            cfg);
 147 }
 148
 149 static struct drm_encoder_helper_funcs atmel_hlcdc_panel_encoder_helper_funcs = {
 150         .mode_fixup = atmel_hlcdc_panel_encoder_mode_fixup,
 151         .mode_set = atmel_hlcdc_rgb_encoder_mode_set,
 152         .disable = atmel_hlcdc_panel_encoder_disable,
 153         .enable = atmel_hlcdc_panel_encoder_enable,
 154 };
 155
 156 static void atmel_hlcdc_rgb_encoder_destroy(struct drm_encoder *encoder)
 157 {
 158         drm_encoder_cleanup(encoder);
 159         memset(encoder, 0, sizeof(*encoder));
 160 }
 161
 162 static const struct drm_encoder_funcs atmel_hlcdc_panel_encoder_funcs = {
 163         .destroy = atmel_hlcdc_rgb_encoder_destroy,
 164 };
 165
 166 static int atmel_hlcdc_panel_get_modes(struct drm_connector *connector)
 167 {
 168         struct atmel_hlcdc_rgb_output *rgb =
 169                         drm_connector_to_atmel_hlcdc_rgb_output(connector);
 170         struct atmel_hlcdc_panel *panel = atmel_hlcdc_rgb_output_to_panel(rgb);
 171
 172         return panel->panel->funcs->get_modes(panel->panel);
 173 }
 174
 175 static int atmel_hlcdc_rgb_mode_valid(struct drm_connector *connector,
 176                                       struct drm_display_mode *mode)
 177 {
 178         struct atmel_hlcdc_rgb_output *rgb =
 179                         drm_connector_to_atmel_hlcdc_rgb_output(connector);
 180
 181         return atmel_hlcdc_dc_mode_valid(rgb->dc, mode);
 182 }
 183
 184
 185
 186 static struct drm_encoder *
 187 atmel_hlcdc_rgb_best_encoder(struct drm_connector *connector)
 188 {
 189         struct atmel_hlcdc_rgb_output *rgb =
 190                         drm_connector_to_atmel_hlcdc_rgb_output(connector);
 191
 192         return &rgb->encoder;
 193 }
 194
 195 static struct drm_connector_helper_funcs atmel_hlcdc_panel_connector_helper_funcs = {
 196         .get_modes = atmel_hlcdc_panel_get_modes,
 197         .mode_valid = atmel_hlcdc_rgb_mode_valid,
 198         .best_encoder = atmel_hlcdc_rgb_best_encoder,
 199 };
 200
 201 static enum drm_connector_status
 202 atmel_hlcdc_panel_connector_detect(struct drm_connector *connector, bool force)
 203 {
 204         return connector_status_connected;
 205 }
 206
 207 static void
 208 atmel_hlcdc_panel_connector_destroy(struct drm_connector *connector)
 209 {
 210         struct atmel_hlcdc_rgb_output *rgb =
 211                         drm_connector_to_atmel_hlcdc_rgb_output(connector);
 212         struct atmel_hlcdc_panel *panel = atmel_hlcdc_rgb_output_to_panel(rgb);
 213
 214         drm_panel_detach(panel->panel);
 215         drm_connector_cleanup(connector);
 216 }
 217
 218 static const struct drm_connector_funcs atmel_hlcdc_panel_connector_funcs = {
 219         .dpms = drm_atomic_helper_connector_dpms,
 220         .detect = atmel_hlcdc_panel_connector_detect,
 221         .fill_modes = drm_helper_probe_single_connector_modes,
 222         .destroy = atmel_hlcdc_panel_connector_destroy,
 223         .reset = drm_atomic_helper_connector_reset,
 224         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 225         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 226 };
 227
 228 static int atmel_hlcdc_create_panel_output(struct drm_device *dev,
 229                                            struct of_endpoint *ep)
 230 {
 231         struct atmel_hlcdc_dc *dc = dev->dev_private;
 232         struct device_node *np;
 233         struct drm_panel *p = NULL;
 234         struct atmel_hlcdc_panel *panel;
 235         int ret;
 236
 237         np = of_graph_get_remote_port_parent(ep->local_node);
 238         if (!np)
 239                 return -EINVAL;
 240
 241         p = of_drm_find_panel(np);
 242         of_node_put(np);
 243
 244         if (!p)
 245                 return -EPROBE_DEFER;
 246
 247         panel = devm_kzalloc(dev->dev, sizeof(*panel), GFP_KERNEL);
 248         if (!panel)
 249                 return -EINVAL;
 250
 251         panel->base.dpms = DRM_MODE_DPMS_OFF;
 252
 253         panel->base.dc = dc;
 254
 255         drm_encoder_helper_add(&panel->base.encoder,
 256                                &atmel_hlcdc_panel_encoder_helper_funcs);
 257         ret = drm_encoder_init(dev, &panel->base.encoder,
 258                                &atmel_hlcdc_panel_encoder_funcs,
 259                                DRM_MODE_ENCODER_LVDS);
 260         if (ret)
 261                 return ret;
 262
 263         panel->base.connector.dpms = DRM_MODE_DPMS_OFF;
 264         panel->base.connector.polled = DRM_CONNECTOR_POLL_CONNECT;
 265         drm_connector_helper_add(&panel->base.connector,
 266                                  &atmel_hlcdc_panel_connector_helper_funcs);
 267         ret = drm_connector_init(dev, &panel->base.connector,
 268                                  &atmel_hlcdc_panel_connector_funcs,
 269                                  DRM_MODE_CONNECTOR_LVDS);
 270         if (ret)
 271                 goto err_encoder_cleanup;
 272
 273         drm_mode_connector_attach_encoder(&panel->base.connector,
 274                                           &panel->base.encoder);
 275         panel->base.encoder.possible_crtcs = 0x1;
 276
 277         drm_panel_attach(p, &panel->base.connector);
 278         panel->panel = p;
 279
 280         return 0;
 281
 282 err_encoder_cleanup:
 283         drm_encoder_cleanup(&panel->base.encoder);
 284
 285         return ret;
 286 }
 287
 288 int atmel_hlcdc_create_outputs(struct drm_device *dev)
 289 {
 290         struct device_node *port_np, *np;
 291         struct of_endpoint ep;
 292         int ret;
 293
 294         port_np = of_get_child_by_name(dev->dev->of_node, "port");
 295         if (!port_np)
 296                 return -EINVAL;
 297
 298         np = of_get_child_by_name(port_np, "endpoint");
 299         of_node_put(port_np);
 300
 301         if (!np)
 302                 return -EINVAL;
 303
 304         ret = of_graph_parse_endpoint(np, &ep);
 305         of_node_put(port_np);
 306
 307         if (ret)
 308                 return ret;
 309
 310         /* We currently only support panel output */
 311         return atmel_hlcdc_create_panel_output(dev, &ep);
 312 }