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