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         struct drm_display_mode mode;
  37         struct drm_panel *panel;
  38         struct drm_bridge *bridge;
  39 };
  40
  41 static inline struct imx_parallel_display *con_to_imxpd(struct drm_connector *c)
  42 {
  43         return container_of(c, struct imx_parallel_display, connector);
  44 }
  45
  46 static inline struct imx_parallel_display *enc_to_imxpd(struct drm_encoder *e)
  47 {
  48         return container_of(e, struct imx_parallel_display, encoder);
  49 }
  50
  51 static enum drm_connector_status imx_pd_connector_detect(
  52                 struct drm_connector *connector, bool force)
  53 {
  54         return connector_status_connected;
  55 }
  56
  57 static int imx_pd_connector_get_modes(struct drm_connector *connector)
  58 {
  59         struct imx_parallel_display *imxpd = con_to_imxpd(connector);
  60         struct device_node *np = imxpd->dev->of_node;
  61         int num_modes = 0;
  62
  63         if (imxpd->panel && imxpd->panel->funcs &&
  64             imxpd->panel->funcs->get_modes) {
  65                 num_modes = imxpd->panel->funcs->get_modes(imxpd->panel);
  66                 if (num_modes > 0)
  67                         return num_modes;
  68         }
  69
  70         if (imxpd->edid) {
  71                 drm_mode_connector_update_edid_property(connector, imxpd->edid);
  72                 num_modes = drm_add_edid_modes(connector, imxpd->edid);
  73         }
  74
  75         if (np) {
  76                 struct drm_display_mode *mode = drm_mode_create(connector->dev);
  77                 int ret;
  78
  79                 if (!mode)
  80                         return -EINVAL;
  81
  82                 ret = of_get_drm_display_mode(np, &imxpd->mode,
  83                                               OF_USE_NATIVE_MODE);
  84                 if (ret)
  85                         return ret;
  86
  87                 drm_mode_copy(mode, &imxpd->mode);
  88                 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
  89                 drm_mode_probed_add(connector, mode);
  90                 num_modes++;
  91         }
  92
  93         return num_modes;
  94 }
  95
  96 static struct drm_encoder *imx_pd_connector_best_encoder(
  97                 struct drm_connector *connector)
  98 {
  99         struct imx_parallel_display *imxpd = con_to_imxpd(connector);
 100
 101         return &imxpd->encoder;
 102 }
 103
 104 static void imx_pd_encoder_enable(struct drm_encoder *encoder)
 105 {
 106         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 107
 108         drm_panel_prepare(imxpd->panel);
 109         drm_panel_enable(imxpd->panel);
 110 }
 111
 112 static void imx_pd_encoder_disable(struct drm_encoder *encoder)
 113 {
 114         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 115
 116         drm_panel_disable(imxpd->panel);
 117         drm_panel_unprepare(imxpd->panel);
 118 }
 119
 120 static int imx_pd_encoder_atomic_check(struct drm_encoder *encoder,
 121                                        struct drm_crtc_state *crtc_state,
 122                                        struct drm_connector_state *conn_state)
 123 {
 124         struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
 125         struct drm_display_info *di = &conn_state->connector->display_info;
 126         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 127
 128         imx_crtc_state->bus_flags = di->bus_flags;
 129         if (!imxpd->bus_format && di->num_bus_formats)
 130                 imx_crtc_state->bus_format = di->bus_formats[0];
 131         else
 132                 imx_crtc_state->bus_format = imxpd->bus_format;
 133         imx_crtc_state->di_hsync_pin = 2;
 134         imx_crtc_state->di_vsync_pin = 3;
 135
 136         return 0;
 137 }
 138
 139 static const struct drm_connector_funcs imx_pd_connector_funcs = {
 140         .dpms = drm_atomic_helper_connector_dpms,
 141         .fill_modes = drm_helper_probe_single_connector_modes,
 142         .detect = imx_pd_connector_detect,
 143         .destroy = imx_drm_connector_destroy,
 144         .reset = drm_atomic_helper_connector_reset,
 145         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 146         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 147 };
 148
 149 static const struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
 150         .get_modes = imx_pd_connector_get_modes,
 151         .best_encoder = imx_pd_connector_best_encoder,
 152 };
 153
 154 static const struct drm_encoder_funcs imx_pd_encoder_funcs = {
 155         .destroy = imx_drm_encoder_destroy,
 156 };
 157
 158 static const struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = {
 159         .enable = imx_pd_encoder_enable,
 160         .disable = imx_pd_encoder_disable,
 161         .atomic_check = imx_pd_encoder_atomic_check,
 162 };
 163
 164 static int imx_pd_register(struct drm_device *drm,
 165         struct imx_parallel_display *imxpd)
 166 {
 167         struct drm_encoder *encoder = &imxpd->encoder;
 168         int ret;
 169
 170         ret = imx_drm_encoder_parse_of(drm, encoder, imxpd->dev->of_node);
 171         if (ret)
 172                 return ret;
 173
 174         /* set the connector's dpms to OFF so that
 175          * drm_helper_connector_dpms() won't return
 176          * immediately since the current state is ON
 177          * at this point.
 178          */
 179         imxpd->connector.dpms = DRM_MODE_DPMS_OFF;
 180
 181         drm_encoder_helper_add(encoder, &imx_pd_encoder_helper_funcs);
 182         drm_encoder_init(drm, encoder, &imx_pd_encoder_funcs,
 183                          DRM_MODE_ENCODER_NONE, NULL);
 184
 185         if (!imxpd->bridge) {
 186                 drm_connector_helper_add(&imxpd->connector,
 187                                 &imx_pd_connector_helper_funcs);
 188                 drm_connector_init(drm, &imxpd->connector,
 189                                    &imx_pd_connector_funcs,
 190                                    DRM_MODE_CONNECTOR_VGA);
 191         }
 192
 193         if (imxpd->panel)
 194                 drm_panel_attach(imxpd->panel, &imxpd->connector);
 195
 196         if (imxpd->bridge) {
 197                 imxpd->bridge->encoder = encoder;
 198                 encoder->bridge = imxpd->bridge;
 199                 ret = drm_bridge_attach(drm, imxpd->bridge);
 200                 if (ret < 0) {
 201                         dev_err(imxpd->dev, "failed to attach bridge: %d\n",
 202                                 ret);
 203                         return ret;
 204                 }
 205         } else {
 206                 drm_mode_connector_attach_encoder(&imxpd->connector, encoder);
 207         }
 208
 209         return 0;
 210 }
 211
 212 static int imx_pd_bind(struct device *dev, struct device *master, void *data)
 213 {
 214         struct drm_device *drm = data;
 215         struct device_node *np = dev->of_node;
 216         struct device_node *ep;
 217         const u8 *edidp;
 218         struct imx_parallel_display *imxpd;
 219         int ret;
 220         u32 bus_format = 0;
 221         const char *fmt;
 222
 223         imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL);
 224         if (!imxpd)
 225                 return -ENOMEM;
 226
 227         edidp = of_get_property(np, "edid", &imxpd->edid_len);
 228         if (edidp)
 229                 imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);
 230
 231         ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
 232         if (!ret) {
 233                 if (!strcmp(fmt, "rgb24"))
 234                         bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 235                 else if (!strcmp(fmt, "rgb565"))
 236                         bus_format = MEDIA_BUS_FMT_RGB565_1X16;
 237                 else if (!strcmp(fmt, "bgr666"))
 238                         bus_format = MEDIA_BUS_FMT_RGB666_1X18;
 239                 else if (!strcmp(fmt, "lvds666"))
 240                         bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
 241         }
 242         imxpd->bus_format = bus_format;
 243
 244         /* port@1 is the output port */
 245         ep = of_graph_get_endpoint_by_regs(np, 1, -1);
 246         if (ep) {
 247                 struct device_node *remote;
 248
 249                 remote = of_graph_get_remote_port_parent(ep);
 250                 if (!remote) {
 251                         dev_warn(dev, "endpoint %s not connected\n",
 252                                  ep->full_name);
 253                         of_node_put(ep);
 254                         return -ENODEV;
 255                 }
 256                 of_node_put(ep);
 257
 258                 imxpd->panel = of_drm_find_panel(remote);
 259                 if (imxpd->panel) {
 260                         dev_dbg(dev, "found panel %s\n", remote->full_name);
 261                 } else {
 262                         imxpd->bridge = of_drm_find_bridge(remote);
 263                         if (imxpd->bridge)
 264                                 dev_dbg(dev, "found bridge %s\n",
 265                                         remote->full_name);
 266                 }
 267                 if (!imxpd->panel && !imxpd->bridge) {
 268                         dev_dbg(dev, "waiting for panel or bridge %s\n",
 269                                 remote->full_name);
 270                         of_node_put(remote);
 271                         return -EPROBE_DEFER;
 272                 }
 273                 of_node_put(remote);
 274         }
 275
 276         imxpd->dev = dev;
 277
 278         ret = imx_pd_register(drm, imxpd);
 279         if (ret)
 280                 return ret;
 281
 282         dev_set_drvdata(dev, imxpd);
 283
 284         return 0;
 285 }
 286
 287 static void imx_pd_unbind(struct device *dev, struct device *master,
 288         void *data)
 289 {
 290         struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
 291
 292         imxpd->encoder.funcs->destroy(&imxpd->encoder);
 293         imxpd->connector.funcs->destroy(&imxpd->connector);
 294
 295         kfree(imxpd->edid);
 296 }
 297
 298 static const struct component_ops imx_pd_ops = {
 299         .bind   = imx_pd_bind,
 300         .unbind = imx_pd_unbind,
 301 };
 302
 303 static int imx_pd_probe(struct platform_device *pdev)
 304 {
 305         return component_add(&pdev->dev, &imx_pd_ops);
 306 }
 307
 308 static int imx_pd_remove(struct platform_device *pdev)
 309 {
 310         component_del(&pdev->dev, &imx_pd_ops);
 311
 312         return 0;
 313 }
 314
 315 static const struct of_device_id imx_pd_dt_ids[] = {
 316         { .compatible = "fsl,imx-parallel-display", },
 317         { /* sentinel */ }
 318 };
 319 MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
 320
 321 static struct platform_driver imx_pd_driver = {
 322         .probe          = imx_pd_probe,
 323         .remove         = imx_pd_remove,
 324         .driver         = {
 325                 .of_match_table = imx_pd_dt_ids,
 326                 .name   = "imx-parallel-display",
 327         },
 328 };
 329
 330 module_platform_driver(imx_pd_driver);
 331
 332 MODULE_DESCRIPTION("i.MX parallel display driver");
 333 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 334 MODULE_LICENSE("GPL");
 335 MODULE_ALIAS("platform:imx-parallel-display");