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 int imx_pd_connector_get_modes(struct drm_connector *connector)
  53 {
  54         struct imx_parallel_display *imxpd = con_to_imxpd(connector);
  55         struct device_node *np = imxpd->dev->of_node;
  56         int num_modes = 0;
  57
  58         if (imxpd->panel && imxpd->panel->funcs &&
  59             imxpd->panel->funcs->get_modes) {
  60                 num_modes = imxpd->panel->funcs->get_modes(imxpd->panel);
  61                 if (num_modes > 0)
  62                         return num_modes;
  63         }
  64
  65         if (imxpd->edid) {
  66                 drm_mode_connector_update_edid_property(connector, imxpd->edid);
  67                 num_modes = drm_add_edid_modes(connector, imxpd->edid);
  68         }
  69
  70         if (np) {
  71                 struct drm_display_mode *mode = drm_mode_create(connector->dev);
  72                 int ret;
  73
  74                 if (!mode)
  75                         return -EINVAL;
  76
  77                 ret = of_get_drm_display_mode(np, &imxpd->mode,
  78                                               &imxpd->bus_flags,
  79                                               OF_USE_NATIVE_MODE);
  80                 if (ret)
  81                         return ret;
  82
  83                 drm_mode_copy(mode, &imxpd->mode);
  84                 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
  85                 drm_mode_probed_add(connector, mode);
  86                 num_modes++;
  87         }
  88
  89         return num_modes;
  90 }
  91
  92 static struct drm_encoder *imx_pd_connector_best_encoder(
  93                 struct drm_connector *connector)
  94 {
  95         struct imx_parallel_display *imxpd = con_to_imxpd(connector);
  96
  97         return &imxpd->encoder;
  98 }
  99
 100 static void imx_pd_encoder_enable(struct drm_encoder *encoder)
 101 {
 102         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 103
 104         drm_panel_prepare(imxpd->panel);
 105         drm_panel_enable(imxpd->panel);
 106 }
 107
 108 static void imx_pd_encoder_disable(struct drm_encoder *encoder)
 109 {
 110         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 111
 112         drm_panel_disable(imxpd->panel);
 113         drm_panel_unprepare(imxpd->panel);
 114 }
 115
 116 static int imx_pd_encoder_atomic_check(struct drm_encoder *encoder,
 117                                        struct drm_crtc_state *crtc_state,
 118                                        struct drm_connector_state *conn_state)
 119 {
 120         struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
 121         struct drm_display_info *di = &conn_state->connector->display_info;
 122         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 123
 124         if (!imxpd->bus_format && di->num_bus_formats) {
 125                 imx_crtc_state->bus_flags = di->bus_flags;
 126                 imx_crtc_state->bus_format = di->bus_formats[0];
 127         } else {
 128                 imx_crtc_state->bus_flags = imxpd->bus_flags;
 129                 imx_crtc_state->bus_format = imxpd->bus_format;
 130         }
 131         imx_crtc_state->di_hsync_pin = 2;
 132         imx_crtc_state->di_vsync_pin = 3;
 133
 134         return 0;
 135 }
 136
 137 static const struct drm_connector_funcs imx_pd_connector_funcs = {
 138         .dpms = drm_atomic_helper_connector_dpms,
 139         .fill_modes = drm_helper_probe_single_connector_modes,
 140         .destroy = imx_drm_connector_destroy,
 141         .reset = drm_atomic_helper_connector_reset,
 142         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 143         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 144 };
 145
 146 static const struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
 147         .get_modes = imx_pd_connector_get_modes,
 148         .best_encoder = imx_pd_connector_best_encoder,
 149 };
 150
 151 static const struct drm_encoder_funcs imx_pd_encoder_funcs = {
 152         .destroy = imx_drm_encoder_destroy,
 153 };
 154
 155 static const struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = {
 156         .enable = imx_pd_encoder_enable,
 157         .disable = imx_pd_encoder_disable,
 158         .atomic_check = imx_pd_encoder_atomic_check,
 159 };
 160
 161 static int imx_pd_register(struct drm_device *drm,
 162         struct imx_parallel_display *imxpd)
 163 {
 164         struct drm_encoder *encoder = &imxpd->encoder;
 165         int ret;
 166
 167         ret = imx_drm_encoder_parse_of(drm, encoder, imxpd->dev->of_node);
 168         if (ret)
 169                 return ret;
 170
 171         /* set the connector's dpms to OFF so that
 172          * drm_helper_connector_dpms() won't return
 173          * immediately since the current state is ON
 174          * at this point.
 175          */
 176         imxpd->connector.dpms = DRM_MODE_DPMS_OFF;
 177
 178         drm_encoder_helper_add(encoder, &imx_pd_encoder_helper_funcs);
 179         drm_encoder_init(drm, encoder, &imx_pd_encoder_funcs,
 180                          DRM_MODE_ENCODER_NONE, NULL);
 181
 182         if (!imxpd->bridge) {
 183                 drm_connector_helper_add(&imxpd->connector,
 184                                 &imx_pd_connector_helper_funcs);
 185                 drm_connector_init(drm, &imxpd->connector,
 186                                    &imx_pd_connector_funcs,
 187                                    DRM_MODE_CONNECTOR_VGA);
 188         }
 189
 190         if (imxpd->panel)
 191                 drm_panel_attach(imxpd->panel, &imxpd->connector);
 192
 193         if (imxpd->bridge) {
 194                 ret = drm_bridge_attach(encoder, imxpd->bridge, NULL);
 195                 if (ret < 0) {
 196                         dev_err(imxpd->dev, "failed to attach bridge: %d\n",
 197                                 ret);
 198                         return ret;
 199                 }
 200         } else {
 201                 drm_mode_connector_attach_encoder(&imxpd->connector, encoder);
 202         }
 203
 204         return 0;
 205 }
 206
 207 static int imx_pd_bind(struct device *dev, struct device *master, void *data)
 208 {
 209         struct drm_device *drm = data;
 210         struct device_node *np = dev->of_node;
 211         struct device_node *ep;
 212         const u8 *edidp;
 213         struct imx_parallel_display *imxpd;
 214         int ret;
 215         u32 bus_format = 0;
 216         const char *fmt;
 217
 218         imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL);
 219         if (!imxpd)
 220                 return -ENOMEM;
 221
 222         edidp = of_get_property(np, "edid", &imxpd->edid_len);
 223         if (edidp)
 224                 imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);
 225
 226         ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
 227         if (!ret) {
 228                 if (!strcmp(fmt, "rgb24"))
 229                         bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 230                 else if (!strcmp(fmt, "rgb565"))
 231                         bus_format = MEDIA_BUS_FMT_RGB565_1X16;
 232                 else if (!strcmp(fmt, "bgr666"))
 233                         bus_format = MEDIA_BUS_FMT_RGB666_1X18;
 234                 else if (!strcmp(fmt, "lvds666"))
 235                         bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
 236         }
 237         imxpd->bus_format = bus_format;
 238
 239         /* port@1 is the output port */
 240         ep = of_graph_get_endpoint_by_regs(np, 1, -1);
 241         if (ep) {
 242                 struct device_node *remote;
 243
 244                 remote = of_graph_get_remote_port_parent(ep);
 245                 if (!remote) {
 246                         dev_warn(dev, "endpoint %s not connected\n",
 247                                  ep->full_name);
 248                         of_node_put(ep);
 249                         return -ENODEV;
 250                 }
 251                 of_node_put(ep);
 252
 253                 imxpd->panel = of_drm_find_panel(remote);
 254                 if (imxpd->panel) {
 255                         dev_dbg(dev, "found panel %s\n", remote->full_name);
 256                 } else {
 257                         imxpd->bridge = of_drm_find_bridge(remote);
 258                         if (imxpd->bridge)
 259                                 dev_dbg(dev, "found bridge %s\n",
 260                                         remote->full_name);
 261                 }
 262                 if (!imxpd->panel && !imxpd->bridge) {
 263                         dev_dbg(dev, "waiting for panel or bridge %s\n",
 264                                 remote->full_name);
 265                         of_node_put(remote);
 266                         return -EPROBE_DEFER;
 267                 }
 268                 of_node_put(remote);
 269         }
 270
 271         imxpd->dev = dev;
 272
 273         ret = imx_pd_register(drm, imxpd);
 274         if (ret)
 275                 return ret;
 276
 277         dev_set_drvdata(dev, imxpd);
 278
 279         return 0;
 280 }
 281
 282 static void imx_pd_unbind(struct device *dev, struct device *master,
 283         void *data)
 284 {
 285         struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
 286
 287         if (imxpd->bridge)
 288                 drm_bridge_detach(imxpd->bridge);
 289         if (imxpd->panel)
 290                 drm_panel_detach(imxpd->panel);
 291
 292         kfree(imxpd->edid);
 293 }
 294
 295 static const struct component_ops imx_pd_ops = {
 296         .bind   = imx_pd_bind,
 297         .unbind = imx_pd_unbind,
 298 };
 299
 300 static int imx_pd_probe(struct platform_device *pdev)
 301 {
 302         return component_add(&pdev->dev, &imx_pd_ops);
 303 }
 304
 305 static int imx_pd_remove(struct platform_device *pdev)
 306 {
 307         component_del(&pdev->dev, &imx_pd_ops);
 308
 309         return 0;
 310 }
 311
 312 static const struct of_device_id imx_pd_dt_ids[] = {
 313         { .compatible = "fsl,imx-parallel-display", },
 314         { /* sentinel */ }
 315 };
 316 MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
 317
 318 static struct platform_driver imx_pd_driver = {
 319         .probe          = imx_pd_probe,
 320         .remove         = imx_pd_remove,
 321         .driver         = {
 322                 .of_match_table = imx_pd_dt_ids,
 323                 .name   = "imx-parallel-display",
 324         },
 325 };
 326
 327 module_platform_driver(imx_pd_driver);
 328
 329 MODULE_DESCRIPTION("i.MX parallel display driver");
 330 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 331 MODULE_LICENSE("GPL");
 332 MODULE_ALIAS("platform:imx-parallel-display");