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_RGB666_1X18:
 130                         cfg |= ATMEL_HLCDC_CONNECTOR_RGB666 << 8;
 131                         break;
 132                 case MEDIA_BUS_FMT_RGB888_1X24:
 133                         cfg |= ATMEL_HLCDC_CONNECTOR_RGB888 << 8;
 134                         break;
 135                 default:
 136                         break;
 137                 }
 138         }
 139
 140         regmap_update_bits(rgb->dc->hlcdc->regmap, ATMEL_HLCDC_CFG(5),
 141                            ATMEL_HLCDC_MODE_MASK,
 142                            cfg);
 143 }
 144
 145 static struct drm_encoder_helper_funcs atmel_hlcdc_panel_encoder_helper_funcs = {
 146         .mode_fixup = atmel_hlcdc_panel_encoder_mode_fixup,
 147         .mode_set = atmel_hlcdc_rgb_encoder_mode_set,
 148         .disable = atmel_hlcdc_panel_encoder_disable,
 149         .enable = atmel_hlcdc_panel_encoder_enable,
 150 };
 151
 152 static void atmel_hlcdc_rgb_encoder_destroy(struct drm_encoder *encoder)
 153 {
 154         drm_encoder_cleanup(encoder);
 155         memset(encoder, 0, sizeof(*encoder));
 156 }
 157
 158 static const struct drm_encoder_funcs atmel_hlcdc_panel_encoder_funcs = {
 159         .destroy = atmel_hlcdc_rgb_encoder_destroy,
 160 };
 161
 162 static int atmel_hlcdc_panel_get_modes(struct drm_connector *connector)
 163 {
 164         struct atmel_hlcdc_rgb_output *rgb =
 165                         drm_connector_to_atmel_hlcdc_rgb_output(connector);
 166         struct atmel_hlcdc_panel *panel = atmel_hlcdc_rgb_output_to_panel(rgb);
 167
 168         return panel->panel->funcs->get_modes(panel->panel);
 169 }
 170
 171 static int atmel_hlcdc_rgb_mode_valid(struct drm_connector *connector,
 172                                       struct drm_display_mode *mode)
 173 {
 174         struct atmel_hlcdc_rgb_output *rgb =
 175                         drm_connector_to_atmel_hlcdc_rgb_output(connector);
 176
 177         return atmel_hlcdc_dc_mode_valid(rgb->dc, mode);
 178 }
 179
 180
 181
 182 static struct drm_encoder *
 183 atmel_hlcdc_rgb_best_encoder(struct drm_connector *connector)
 184 {
 185         struct atmel_hlcdc_rgb_output *rgb =
 186                         drm_connector_to_atmel_hlcdc_rgb_output(connector);
 187
 188         return &rgb->encoder;
 189 }
 190
 191 static struct drm_connector_helper_funcs atmel_hlcdc_panel_connector_helper_funcs = {
 192         .get_modes = atmel_hlcdc_panel_get_modes,
 193         .mode_valid = atmel_hlcdc_rgb_mode_valid,
 194         .best_encoder = atmel_hlcdc_rgb_best_encoder,
 195 };
 196
 197 static enum drm_connector_status
 198 atmel_hlcdc_panel_connector_detect(struct drm_connector *connector, bool force)
 199 {
 200         return connector_status_connected;
 201 }
 202
 203 static void
 204 atmel_hlcdc_panel_connector_destroy(struct drm_connector *connector)
 205 {
 206         struct atmel_hlcdc_rgb_output *rgb =
 207                         drm_connector_to_atmel_hlcdc_rgb_output(connector);
 208         struct atmel_hlcdc_panel *panel = atmel_hlcdc_rgb_output_to_panel(rgb);
 209
 210         drm_panel_detach(panel->panel);
 211         drm_connector_cleanup(connector);
 212 }
 213
 214 static const struct drm_connector_funcs atmel_hlcdc_panel_connector_funcs = {
 215         .dpms = drm_atomic_helper_connector_dpms,
 216         .detect = atmel_hlcdc_panel_connector_detect,
 217         .fill_modes = drm_helper_probe_single_connector_modes,
 218         .destroy = atmel_hlcdc_panel_connector_destroy,
 219         .reset = drm_atomic_helper_connector_reset,
 220         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 221         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 222 };
 223
 224 static int atmel_hlcdc_create_panel_output(struct drm_device *dev,
 225                                            struct of_endpoint *ep)
 226 {
 227         struct atmel_hlcdc_dc *dc = dev->dev_private;
 228         struct device_node *np;
 229         struct drm_panel *p = NULL;
 230         struct atmel_hlcdc_panel *panel;
 231         int ret;
 232
 233         np = of_graph_get_remote_port_parent(ep->local_node);
 234         if (!np)
 235                 return -EINVAL;
 236
 237         p = of_drm_find_panel(np);
 238         of_node_put(np);
 239
 240         if (!p)
 241                 return -EPROBE_DEFER;
 242
 243         panel = devm_kzalloc(dev->dev, sizeof(*panel), GFP_KERNEL);
 244         if (!panel)
 245                 return -EINVAL;
 246
 247         panel->base.dpms = DRM_MODE_DPMS_OFF;
 248
 249         panel->base.dc = dc;
 250
 251         drm_encoder_helper_add(&panel->base.encoder,
 252                                &atmel_hlcdc_panel_encoder_helper_funcs);
 253         ret = drm_encoder_init(dev, &panel->base.encoder,
 254                                &atmel_hlcdc_panel_encoder_funcs,
 255                                DRM_MODE_ENCODER_LVDS);
 256         if (ret)
 257                 return ret;
 258
 259         panel->base.connector.dpms = DRM_MODE_DPMS_OFF;
 260         panel->base.connector.polled = DRM_CONNECTOR_POLL_CONNECT;
 261         drm_connector_helper_add(&panel->base.connector,
 262                                  &atmel_hlcdc_panel_connector_helper_funcs);
 263         ret = drm_connector_init(dev, &panel->base.connector,
 264                                  &atmel_hlcdc_panel_connector_funcs,
 265                                  DRM_MODE_CONNECTOR_LVDS);
 266         if (ret)
 267                 goto err_encoder_cleanup;
 268
 269         drm_mode_connector_attach_encoder(&panel->base.connector,
 270                                           &panel->base.encoder);
 271         panel->base.encoder.possible_crtcs = 0x1;
 272
 273         drm_panel_attach(p, &panel->base.connector);
 274         panel->panel = p;
 275
 276         return 0;
 277
 278 err_encoder_cleanup:
 279         drm_encoder_cleanup(&panel->base.encoder);
 280
 281         return ret;
 282 }
 283
 284 int atmel_hlcdc_create_outputs(struct drm_device *dev)
 285 {
 286         struct device_node *port_np, *np;
 287         struct of_endpoint ep;
 288         int ret;
 289
 290         port_np = of_get_child_by_name(dev->dev->of_node, "port");
 291         if (!port_np)
 292                 return -EINVAL;
 293
 294         np = of_get_child_by_name(port_np, "endpoint");
 295         of_node_put(port_np);
 296
 297         if (!np)
 298                 return -EINVAL;
 299
 300         ret = of_graph_parse_endpoint(np, &ep);
 301         of_node_put(port_np);
 302
 303         if (ret)
 304                 return ret;
 305
 306         /* We currently only support panel output */
 307         return atmel_hlcdc_create_panel_output(dev, &ep);
 308 }