drivers/gpu/drm/imx/parallel-display.c

   1 /*
   2  * i.MX drm driver - parallel display implementation
   3  *
   4  * Copyright (C) 2012 Sascha Hauer, Pengutronix
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version 2
   9  * of the License, or (at your option) any later version.
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 #include <linux/component.h>
  17 #include <linux/module.h>
  18 #include <drm/drmP.h>
  19 #include <drm/drm_atomic_helper.h>
  20 #include <drm/drm_fb_helper.h>
  21 #include <drm/drm_crtc_helper.h>
  22 #include <drm/drm_panel.h>
  23 #include <linux/videodev2.h>
  24 #include <video/of_display_timing.h>
  25 #include <linux/of_graph.h>
  26
  27 #include "imx-drm.h"
  28
  29 struct imx_parallel_display {
  30         struct drm_connector connector;
  31         struct drm_encoder encoder;
  32         struct device *dev;
  33         void *edid;
  34         int edid_len;
  35         u32 bus_format;
  36         u32 bus_flags;
  37         struct drm_display_mode mode;
  38         struct drm_panel *panel;
  39         struct drm_bridge *bridge;
  40 };
  41
  42 static inline struct imx_parallel_display *con_to_imxpd(struct drm_connector *c)
  43 {
  44         return container_of(c, struct imx_parallel_display, connector);
  45 }
  46
  47 static inline struct imx_parallel_display *enc_to_imxpd(struct drm_encoder *e)
  48 {
  49         return container_of(e, struct imx_parallel_display, encoder);
  50 }
  51
  52 static enum drm_connector_status imx_pd_connector_detect(
  53                 struct drm_connector *connector, bool force)
  54 {
  55         return connector_status_connected;
  56 }
  57
  58 static int imx_pd_connector_get_modes(struct drm_connector *connector)
  59 {
  60         struct imx_parallel_display *imxpd = con_to_imxpd(connector);
  61         struct device_node *np = imxpd->dev->of_node;
  62         int num_modes = 0;
  63
  64         if (imxpd->panel && imxpd->panel->funcs &&
  65             imxpd->panel->funcs->get_modes) {
  66                 num_modes = imxpd->panel->funcs->get_modes(imxpd->panel);
  67                 if (num_modes > 0)
  68                         return num_modes;
  69         }
  70
  71         if (imxpd->edid) {
  72                 drm_mode_connector_update_edid_property(connector, imxpd->edid);
  73                 num_modes = drm_add_edid_modes(connector, imxpd->edid);
  74         }
  75
  76         if (np) {
  77                 struct drm_display_mode *mode = drm_mode_create(connector->dev);
  78                 int ret;
  79
  80                 if (!mode)
  81                         return -EINVAL;
  82
  83                 ret = of_get_drm_display_mode(np, &imxpd->mode,
  84                                               &imxpd->bus_flags,
  85                                               OF_USE_NATIVE_MODE);
  86                 if (ret) {
  87                         drm_mode_destroy(connector->dev, mode);
  88                         return ret;
  89                 }
  90
  91                 drm_mode_copy(mode, &imxpd->mode);
  92                 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
  93                 drm_mode_probed_add(connector, mode);
  94                 num_modes++;
  95         }
  96
  97         return num_modes;
  98 }
  99
 100 static struct drm_encoder *imx_pd_connector_best_encoder(
 101                 struct drm_connector *connector)
 102 {
 103         struct imx_parallel_display *imxpd = con_to_imxpd(connector);
 104
 105         return &imxpd->encoder;
 106 }
 107
 108 static void imx_pd_encoder_enable(struct drm_encoder *encoder)
 109 {
 110         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 111
 112         drm_panel_prepare(imxpd->panel);
 113         drm_panel_enable(imxpd->panel);
 114 }
 115
 116 static void imx_pd_encoder_disable(struct drm_encoder *encoder)
 117 {
 118         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 119
 120         drm_panel_disable(imxpd->panel);
 121         drm_panel_unprepare(imxpd->panel);
 122 }
 123
 124 static int imx_pd_encoder_atomic_check(struct drm_encoder *encoder,
 125                                        struct drm_crtc_state *crtc_state,
 126                                        struct drm_connector_state *conn_state)
 127 {
 128         struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
 129         struct drm_display_info *di = &conn_state->connector->display_info;
 130         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 131
 132         if (!imxpd->bus_format && di->num_bus_formats) {
 133                 imx_crtc_state->bus_flags = di->bus_flags;
 134                 imx_crtc_state->bus_format = di->bus_formats[0];
 135         } else {
 136                 imx_crtc_state->bus_flags = imxpd->bus_flags;
 137                 imx_crtc_state->bus_format = imxpd->bus_format;
 138         }
 139         imx_crtc_state->di_hsync_pin = 2;
 140         imx_crtc_state->di_vsync_pin = 3;
 141
 142         return 0;
 143 }
 144
 145 static const struct drm_connector_funcs imx_pd_connector_funcs = {
 146         .dpms = drm_atomic_helper_connector_dpms,
 147         .fill_modes = drm_helper_probe_single_connector_modes,
 148         .detect = imx_pd_connector_detect,
 149         .destroy = imx_drm_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 const struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
 156         .get_modes = imx_pd_connector_get_modes,
 157         .best_encoder = imx_pd_connector_best_encoder,
 158 };
 159
 160 static const struct drm_encoder_funcs imx_pd_encoder_funcs = {
 161         .destroy = imx_drm_encoder_destroy,
 162 };
 163
 164 static const struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = {
 165         .enable = imx_pd_encoder_enable,
 166         .disable = imx_pd_encoder_disable,
 167         .atomic_check = imx_pd_encoder_atomic_check,
 168 };
 169
 170 static int imx_pd_register(struct drm_device *drm,
 171         struct imx_parallel_display *imxpd)
 172 {
 173         struct drm_encoder *encoder = &imxpd->encoder;
 174         int ret;
 175
 176         ret = imx_drm_encoder_parse_of(drm, encoder, imxpd->dev->of_node);
 177         if (ret)
 178                 return ret;
 179
 180         /* set the connector's dpms to OFF so that
 181          * drm_helper_connector_dpms() won't return
 182          * immediately since the current state is ON
 183          * at this point.
 184          */
 185         imxpd->connector.dpms = DRM_MODE_DPMS_OFF;
 186
 187         drm_encoder_helper_add(encoder, &imx_pd_encoder_helper_funcs);
 188         drm_encoder_init(drm, encoder, &imx_pd_encoder_funcs,
 189                          DRM_MODE_ENCODER_NONE, NULL);
 190
 191         if (!imxpd->bridge) {
 192                 drm_connector_helper_add(&imxpd->connector,
 193                                 &imx_pd_connector_helper_funcs);
 194                 drm_connector_init(drm, &imxpd->connector,
 195                                    &imx_pd_connector_funcs,
 196                                    DRM_MODE_CONNECTOR_VGA);
 197         }
 198
 199         if (imxpd->panel)
 200                 drm_panel_attach(imxpd->panel, &imxpd->connector);
 201
 202         if (imxpd->bridge) {
 203                 imxpd->bridge->encoder = encoder;
 204                 encoder->bridge = imxpd->bridge;
 205                 ret = drm_bridge_attach(drm, imxpd->bridge);
 206                 if (ret < 0) {
 207                         dev_err(imxpd->dev, "failed to attach bridge: %d\n",
 208                                 ret);
 209                         return ret;
 210                 }
 211         } else {
 212                 drm_mode_connector_attach_encoder(&imxpd->connector, encoder);
 213         }
 214
 215         return 0;
 216 }
 217
 218 static int imx_pd_bind(struct device *dev, struct device *master, void *data)
 219 {
 220         struct drm_device *drm = data;
 221         struct device_node *np = dev->of_node;
 222         struct device_node *ep;
 223         const u8 *edidp;
 224         struct imx_parallel_display *imxpd;
 225         int ret;
 226         u32 bus_format = 0;
 227         const char *fmt;
 228
 229         imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL);
 230         if (!imxpd)
 231                 return -ENOMEM;
 232
 233         edidp = of_get_property(np, "edid", &imxpd->edid_len);
 234         if (edidp)
 235                 imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);
 236
 237         ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
 238         if (!ret) {
 239                 if (!strcmp(fmt, "rgb24"))
 240                         bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 241                 else if (!strcmp(fmt, "rgb565"))
 242                         bus_format = MEDIA_BUS_FMT_RGB565_1X16;
 243                 else if (!strcmp(fmt, "bgr666"))
 244                         bus_format = MEDIA_BUS_FMT_RGB666_1X18;
 245                 else if (!strcmp(fmt, "lvds666"))
 246                         bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
 247         }
 248         imxpd->bus_format = bus_format;
 249
 250         /* port@1 is the output port */
 251         ep = of_graph_get_endpoint_by_regs(np, 1, -1);
 252         if (ep) {
 253                 struct device_node *remote;
 254
 255                 remote = of_graph_get_remote_port_parent(ep);
 256                 if (!remote) {
 257                         dev_warn(dev, "endpoint %s not connected\n",
 258                                  ep->full_name);
 259                         of_node_put(ep);
 260                         return -ENODEV;
 261                 }
 262                 of_node_put(ep);
 263
 264                 imxpd->panel = of_drm_find_panel(remote);
 265                 if (imxpd->panel) {
 266                         dev_dbg(dev, "found panel %s\n", remote->full_name);
 267                 } else {
 268                         imxpd->bridge = of_drm_find_bridge(remote);
 269                         if (imxpd->bridge)
 270                                 dev_dbg(dev, "found bridge %s\n",
 271                                         remote->full_name);
 272                 }
 273                 if (!imxpd->panel && !imxpd->bridge) {
 274                         dev_dbg(dev, "waiting for panel or bridge %s\n",
 275                                 remote->full_name);
 276                         of_node_put(remote);
 277                         return -EPROBE_DEFER;
 278                 }
 279                 of_node_put(remote);
 280         }
 281
 282         imxpd->dev = dev;
 283
 284         ret = imx_pd_register(drm, imxpd);
 285         if (ret)
 286                 return ret;
 287
 288         dev_set_drvdata(dev, imxpd);
 289
 290         return 0;
 291 }
 292
 293 static void imx_pd_unbind(struct device *dev, struct device *master,
 294         void *data)
 295 {
 296         struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
 297
 298         if (imxpd->bridge)
 299                 drm_bridge_detach(imxpd->bridge);
 300         if (imxpd->panel)
 301                 drm_panel_detach(imxpd->panel);
 302
 303         kfree(imxpd->edid);
 304 }
 305
 306 static const struct component_ops imx_pd_ops = {
 307         .bind   = imx_pd_bind,
 308         .unbind = imx_pd_unbind,
 309 };
 310
 311 static int imx_pd_probe(struct platform_device *pdev)
 312 {
 313         return component_add(&pdev->dev, &imx_pd_ops);
 314 }
 315
 316 static int imx_pd_remove(struct platform_device *pdev)
 317 {
 318         component_del(&pdev->dev, &imx_pd_ops);
 319
 320         return 0;
 321 }
 322
 323 static const struct of_device_id imx_pd_dt_ids[] = {
 324         { .compatible = "fsl,imx-parallel-display", },
 325         { /* sentinel */ }
 326 };
 327 MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
 328
 329 static struct platform_driver imx_pd_driver = {
 330         .probe          = imx_pd_probe,
 331         .remove         = imx_pd_remove,
 332         .driver         = {
 333                 .of_match_table = imx_pd_dt_ids,
 334                 .name   = "imx-parallel-display",
 335         },
 336 };
 337
 338 module_platform_driver(imx_pd_driver);
 339
 340 MODULE_DESCRIPTION("i.MX parallel display driver");
 341 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 342 MODULE_LICENSE("GPL");
 343 MODULE_ALIAS("platform:imx-parallel-display");