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                         return ret;
  88
  89                 drm_mode_copy(mode, &imxpd->mode);
  90                 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
  91                 drm_mode_probed_add(connector, mode);
  92                 num_modes++;
  93         }
  94
  95         return num_modes;
  96 }
  97
  98 static struct drm_encoder *imx_pd_connector_best_encoder(
  99                 struct drm_connector *connector)
 100 {
 101         struct imx_parallel_display *imxpd = con_to_imxpd(connector);
 102
 103         return &imxpd->encoder;
 104 }
 105
 106 static void imx_pd_encoder_enable(struct drm_encoder *encoder)
 107 {
 108         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 109
 110         drm_panel_prepare(imxpd->panel);
 111         drm_panel_enable(imxpd->panel);
 112 }
 113
 114 static void imx_pd_encoder_disable(struct drm_encoder *encoder)
 115 {
 116         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 117
 118         drm_panel_disable(imxpd->panel);
 119         drm_panel_unprepare(imxpd->panel);
 120 }
 121
 122 static int imx_pd_encoder_atomic_check(struct drm_encoder *encoder,
 123                                        struct drm_crtc_state *crtc_state,
 124                                        struct drm_connector_state *conn_state)
 125 {
 126         struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
 127         struct drm_display_info *di = &conn_state->connector->display_info;
 128         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 129
 130         if (!imxpd->bus_format && di->num_bus_formats) {
 131                 imx_crtc_state->bus_flags = di->bus_flags;
 132                 imx_crtc_state->bus_format = di->bus_formats[0];
 133         } else {
 134                 imx_crtc_state->bus_flags = imxpd->bus_flags;
 135                 imx_crtc_state->bus_format = imxpd->bus_format;
 136         }
 137         imx_crtc_state->di_hsync_pin = 2;
 138         imx_crtc_state->di_vsync_pin = 3;
 139
 140         return 0;
 141 }
 142
 143 static const struct drm_connector_funcs imx_pd_connector_funcs = {
 144         .dpms = drm_atomic_helper_connector_dpms,
 145         .fill_modes = drm_helper_probe_single_connector_modes,
 146         .detect = imx_pd_connector_detect,
 147         .destroy = imx_drm_connector_destroy,
 148         .reset = drm_atomic_helper_connector_reset,
 149         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 150         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 151 };
 152
 153 static const struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
 154         .get_modes = imx_pd_connector_get_modes,
 155         .best_encoder = imx_pd_connector_best_encoder,
 156 };
 157
 158 static const struct drm_encoder_funcs imx_pd_encoder_funcs = {
 159         .destroy = imx_drm_encoder_destroy,
 160 };
 161
 162 static const struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = {
 163         .enable = imx_pd_encoder_enable,
 164         .disable = imx_pd_encoder_disable,
 165         .atomic_check = imx_pd_encoder_atomic_check,
 166 };
 167
 168 static int imx_pd_register(struct drm_device *drm,
 169         struct imx_parallel_display *imxpd)
 170 {
 171         struct drm_encoder *encoder = &imxpd->encoder;
 172         int ret;
 173
 174         ret = imx_drm_encoder_parse_of(drm, encoder, imxpd->dev->of_node);
 175         if (ret)
 176                 return ret;
 177
 178         /* set the connector's dpms to OFF so that
 179          * drm_helper_connector_dpms() won't return
 180          * immediately since the current state is ON
 181          * at this point.
 182          */
 183         imxpd->connector.dpms = DRM_MODE_DPMS_OFF;
 184
 185         drm_encoder_helper_add(encoder, &imx_pd_encoder_helper_funcs);
 186         drm_encoder_init(drm, encoder, &imx_pd_encoder_funcs,
 187                          DRM_MODE_ENCODER_NONE, NULL);
 188
 189         if (!imxpd->bridge) {
 190                 drm_connector_helper_add(&imxpd->connector,
 191                                 &imx_pd_connector_helper_funcs);
 192                 drm_connector_init(drm, &imxpd->connector,
 193                                    &imx_pd_connector_funcs,
 194                                    DRM_MODE_CONNECTOR_VGA);
 195         }
 196
 197         if (imxpd->panel)
 198                 drm_panel_attach(imxpd->panel, &imxpd->connector);
 199
 200         if (imxpd->bridge) {
 201                 imxpd->bridge->encoder = encoder;
 202                 encoder->bridge = imxpd->bridge;
 203                 ret = drm_bridge_attach(drm, imxpd->bridge);
 204                 if (ret < 0) {
 205                         dev_err(imxpd->dev, "failed to attach bridge: %d\n",
 206                                 ret);
 207                         return ret;
 208                 }
 209         } else {
 210                 drm_mode_connector_attach_encoder(&imxpd->connector, encoder);
 211         }
 212
 213         return 0;
 214 }
 215
 216 static int imx_pd_bind(struct device *dev, struct device *master, void *data)
 217 {
 218         struct drm_device *drm = data;
 219         struct device_node *np = dev->of_node;
 220         struct device_node *ep;
 221         const u8 *edidp;
 222         struct imx_parallel_display *imxpd;
 223         int ret;
 224         u32 bus_format = 0;
 225         const char *fmt;
 226
 227         imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL);
 228         if (!imxpd)
 229                 return -ENOMEM;
 230
 231         edidp = of_get_property(np, "edid", &imxpd->edid_len);
 232         if (edidp)
 233                 imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);
 234
 235         ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
 236         if (!ret) {
 237                 if (!strcmp(fmt, "rgb24"))
 238                         bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 239                 else if (!strcmp(fmt, "rgb565"))
 240                         bus_format = MEDIA_BUS_FMT_RGB565_1X16;
 241                 else if (!strcmp(fmt, "bgr666"))
 242                         bus_format = MEDIA_BUS_FMT_RGB666_1X18;
 243                 else if (!strcmp(fmt, "lvds666"))
 244                         bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
 245         }
 246         imxpd->bus_format = bus_format;
 247
 248         /* port@1 is the output port */
 249         ep = of_graph_get_endpoint_by_regs(np, 1, -1);
 250         if (ep) {
 251                 struct device_node *remote;
 252
 253                 remote = of_graph_get_remote_port_parent(ep);
 254                 if (!remote) {
 255                         dev_warn(dev, "endpoint %s not connected\n",
 256                                  ep->full_name);
 257                         of_node_put(ep);
 258                         return -ENODEV;
 259                 }
 260                 of_node_put(ep);
 261
 262                 imxpd->panel = of_drm_find_panel(remote);
 263                 if (imxpd->panel) {
 264                         dev_dbg(dev, "found panel %s\n", remote->full_name);
 265                 } else {
 266                         imxpd->bridge = of_drm_find_bridge(remote);
 267                         if (imxpd->bridge)
 268                                 dev_dbg(dev, "found bridge %s\n",
 269                                         remote->full_name);
 270                 }
 271                 if (!imxpd->panel && !imxpd->bridge) {
 272                         dev_dbg(dev, "waiting for panel or bridge %s\n",
 273                                 remote->full_name);
 274                         of_node_put(remote);
 275                         return -EPROBE_DEFER;
 276                 }
 277                 of_node_put(remote);
 278         }
 279
 280         imxpd->dev = dev;
 281
 282         ret = imx_pd_register(drm, imxpd);
 283         if (ret)
 284                 return ret;
 285
 286         dev_set_drvdata(dev, imxpd);
 287
 288         return 0;
 289 }
 290
 291 static void imx_pd_unbind(struct device *dev, struct device *master,
 292         void *data)
 293 {
 294         struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
 295
 296         if (imxpd->bridge)
 297                 drm_bridge_detach(imxpd->bridge);
 298         if (imxpd->panel)
 299                 drm_panel_detach(imxpd->panel);
 300
 301         kfree(imxpd->edid);
 302 }
 303
 304 static const struct component_ops imx_pd_ops = {
 305         .bind   = imx_pd_bind,
 306         .unbind = imx_pd_unbind,
 307 };
 308
 309 static int imx_pd_probe(struct platform_device *pdev)
 310 {
 311         return component_add(&pdev->dev, &imx_pd_ops);
 312 }
 313
 314 static int imx_pd_remove(struct platform_device *pdev)
 315 {
 316         component_del(&pdev->dev, &imx_pd_ops);
 317
 318         return 0;
 319 }
 320
 321 static const struct of_device_id imx_pd_dt_ids[] = {
 322         { .compatible = "fsl,imx-parallel-display", },
 323         { /* sentinel */ }
 324 };
 325 MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
 326
 327 static struct platform_driver imx_pd_driver = {
 328         .probe          = imx_pd_probe,
 329         .remove         = imx_pd_remove,
 330         .driver         = {
 331                 .of_match_table = imx_pd_dt_ids,
 332                 .name   = "imx-parallel-display",
 333         },
 334 };
 335
 336 module_platform_driver(imx_pd_driver);
 337
 338 MODULE_DESCRIPTION("i.MX parallel display driver");
 339 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 340 MODULE_LICENSE("GPL");
 341 MODULE_ALIAS("platform:imx-parallel-display");