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 #define con_to_imxpd(x) container_of(x, struct imx_parallel_display, connector)
  30 #define imx_enc_to_imxpd(x)     \
  31                 container_of(x, struct imx_parallel_display, imx_encoder)
  32
  33 struct imx_parallel_display {
  34         struct drm_connector connector;
  35         struct imx_drm_encoder imx_encoder;
  36         struct device *dev;
  37         void *edid;
  38         int edid_len;
  39         struct drm_display_mode mode;
  40         struct drm_panel *panel;
  41 };
  42
  43 static enum drm_connector_status imx_pd_connector_detect(
  44                 struct drm_connector *connector, bool force)
  45 {
  46         return connector_status_connected;
  47 }
  48
  49 static int imx_pd_connector_get_modes(struct drm_connector *connector)
  50 {
  51         struct imx_parallel_display *imxpd = con_to_imxpd(connector);
  52         struct device_node *np = imxpd->dev->of_node;
  53         int num_modes = 0;
  54
  55         if (imxpd->panel && imxpd->panel->funcs &&
  56             imxpd->panel->funcs->get_modes) {
  57                 struct drm_display_info *di = &connector->display_info;
  58
  59                 num_modes = imxpd->panel->funcs->get_modes(imxpd->panel);
  60                 if (!imxpd->imx_encoder.bus_format && di->num_bus_formats)
  61                         imxpd->imx_encoder.bus_format = di->bus_formats[0];
  62                 imxpd->imx_encoder.bus_flags = di->bus_flags;
  63                 if (num_modes > 0)
  64                         return num_modes;
  65         }
  66
  67         if (imxpd->edid) {
  68                 drm_mode_connector_update_edid_property(connector, imxpd->edid);
  69                 num_modes = drm_add_edid_modes(connector, imxpd->edid);
  70         }
  71
  72         if (np) {
  73                 struct drm_display_mode *mode = drm_mode_create(connector->dev);
  74
  75                 if (!mode)
  76                         return -EINVAL;
  77                 of_get_drm_display_mode(np, &imxpd->mode, OF_USE_NATIVE_MODE);
  78                 drm_mode_copy(mode, &imxpd->mode);
  79                 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
  80                 drm_mode_probed_add(connector, mode);
  81                 num_modes++;
  82         }
  83
  84         return num_modes;
  85 }
  86
  87 static struct drm_encoder *imx_pd_connector_best_encoder(
  88                 struct drm_connector *connector)
  89 {
  90         struct imx_parallel_display *imxpd = con_to_imxpd(connector);
  91
  92         return &imxpd->imx_encoder.encoder;
  93 }
  94
  95 static void imx_pd_encoder_dpms(struct drm_encoder *encoder, int mode)
  96 {
  97         struct imx_drm_encoder *imx_encoder = enc_to_imx_enc(encoder);
  98         struct imx_parallel_display *imxpd = imx_enc_to_imxpd(imx_encoder);
  99
 100         if (mode != DRM_MODE_DPMS_ON)
 101                 drm_panel_disable(imxpd->panel);
 102         else
 103                 drm_panel_enable(imxpd->panel);
 104 }
 105
 106 static void imx_pd_encoder_commit(struct drm_encoder *encoder)
 107 {
 108         struct imx_drm_encoder *imx_encoder = enc_to_imx_enc(encoder);
 109         struct imx_parallel_display *imxpd = imx_enc_to_imxpd(imx_encoder);
 110
 111         drm_panel_prepare(imxpd->panel);
 112         drm_panel_enable(imxpd->panel);
 113 }
 114
 115 static void imx_pd_encoder_mode_set(struct drm_encoder *encoder,
 116                          struct drm_display_mode *orig_mode,
 117                          struct drm_display_mode *mode)
 118 {
 119 }
 120
 121 static void imx_pd_encoder_disable(struct drm_encoder *encoder)
 122 {
 123         struct imx_drm_encoder *imx_encoder = enc_to_imx_enc(encoder);
 124         struct imx_parallel_display *imxpd = imx_enc_to_imxpd(imx_encoder);
 125
 126         drm_panel_disable(imxpd->panel);
 127         drm_panel_unprepare(imxpd->panel);
 128 }
 129
 130 static const struct drm_connector_funcs imx_pd_connector_funcs = {
 131         .dpms = drm_helper_connector_dpms,
 132         .fill_modes = drm_helper_probe_single_connector_modes,
 133         .detect = imx_pd_connector_detect,
 134         .destroy = imx_drm_connector_destroy,
 135         .reset = drm_atomic_helper_connector_reset,
 136         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 137         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 138 };
 139
 140 static const struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
 141         .get_modes = imx_pd_connector_get_modes,
 142         .best_encoder = imx_pd_connector_best_encoder,
 143 };
 144
 145 static const struct drm_encoder_funcs imx_pd_encoder_funcs = {
 146         .destroy = imx_drm_encoder_destroy,
 147 };
 148
 149 static const struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = {
 150         .dpms = imx_pd_encoder_dpms,
 151         .commit = imx_pd_encoder_commit,
 152         .mode_set = imx_pd_encoder_mode_set,
 153         .disable = imx_pd_encoder_disable,
 154 };
 155
 156 static int imx_pd_register(struct drm_device *drm,
 157         struct imx_parallel_display *imxpd)
 158 {
 159         int ret;
 160
 161         ret = imx_drm_encoder_parse_of(drm, &imxpd->imx_encoder.encoder,
 162                                        imxpd->dev->of_node);
 163         if (ret)
 164                 return ret;
 165
 166         /* set the connector's dpms to OFF so that
 167          * drm_helper_connector_dpms() won't return
 168          * immediately since the current state is ON
 169          * at this point.
 170          */
 171         imxpd->connector.dpms = DRM_MODE_DPMS_OFF;
 172
 173         drm_encoder_helper_add(&imxpd->imx_encoder.encoder,
 174                                &imx_pd_encoder_helper_funcs);
 175         drm_encoder_init(drm, &imxpd->imx_encoder.encoder,
 176                          &imx_pd_encoder_funcs, DRM_MODE_ENCODER_NONE, NULL);
 177
 178         drm_connector_helper_add(&imxpd->connector,
 179                         &imx_pd_connector_helper_funcs);
 180         drm_connector_init(drm, &imxpd->connector, &imx_pd_connector_funcs,
 181                            DRM_MODE_CONNECTOR_VGA);
 182
 183         if (imxpd->panel)
 184                 drm_panel_attach(imxpd->panel, &imxpd->connector);
 185
 186         drm_mode_connector_attach_encoder(&imxpd->connector,
 187                                           &imxpd->imx_encoder.encoder);
 188
 189         return 0;
 190 }
 191
 192 static int imx_pd_bind(struct device *dev, struct device *master, void *data)
 193 {
 194         struct drm_device *drm = data;
 195         struct device_node *np = dev->of_node;
 196         struct device_node *ep;
 197         const u8 *edidp;
 198         struct imx_parallel_display *imxpd;
 199         int ret;
 200         u32 bus_format = 0;
 201         const char *fmt;
 202
 203         imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL);
 204         if (!imxpd)
 205                 return -ENOMEM;
 206
 207         edidp = of_get_property(np, "edid", &imxpd->edid_len);
 208         if (edidp)
 209                 imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);
 210
 211         ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
 212         if (!ret) {
 213                 if (!strcmp(fmt, "rgb24"))
 214                         bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 215                 else if (!strcmp(fmt, "rgb565"))
 216                         bus_format = MEDIA_BUS_FMT_RGB565_1X16;
 217                 else if (!strcmp(fmt, "bgr666"))
 218                         bus_format = MEDIA_BUS_FMT_RGB666_1X18;
 219                 else if (!strcmp(fmt, "lvds666"))
 220                         bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
 221         }
 222         imxpd->imx_encoder.bus_format = bus_format;
 223         imxpd->imx_encoder.di_hsync_pin = 2;
 224         imxpd->imx_encoder.di_vsync_pin = 3;
 225
 226         /* port@1 is the output port */
 227         ep = of_graph_get_endpoint_by_regs(np, 1, -1);
 228         if (ep) {
 229                 struct device_node *remote;
 230
 231                 remote = of_graph_get_remote_port_parent(ep);
 232                 of_node_put(ep);
 233                 if (remote) {
 234                         imxpd->panel = of_drm_find_panel(remote);
 235                         of_node_put(remote);
 236                 }
 237                 if (!imxpd->panel)
 238                         return -EPROBE_DEFER;
 239         }
 240
 241         imxpd->dev = dev;
 242
 243         ret = imx_pd_register(drm, imxpd);
 244         if (ret)
 245                 return ret;
 246
 247         dev_set_drvdata(dev, imxpd);
 248
 249         return 0;
 250 }
 251
 252 static void imx_pd_unbind(struct device *dev, struct device *master,
 253         void *data)
 254 {
 255         struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
 256
 257         imxpd->imx_encoder.encoder.funcs->destroy(&imxpd->imx_encoder.encoder);
 258         imxpd->connector.funcs->destroy(&imxpd->connector);
 259
 260         kfree(imxpd->edid);
 261 }
 262
 263 static const struct component_ops imx_pd_ops = {
 264         .bind   = imx_pd_bind,
 265         .unbind = imx_pd_unbind,
 266 };
 267
 268 static int imx_pd_probe(struct platform_device *pdev)
 269 {
 270         return component_add(&pdev->dev, &imx_pd_ops);
 271 }
 272
 273 static int imx_pd_remove(struct platform_device *pdev)
 274 {
 275         component_del(&pdev->dev, &imx_pd_ops);
 276
 277         return 0;
 278 }
 279
 280 static const struct of_device_id imx_pd_dt_ids[] = {
 281         { .compatible = "fsl,imx-parallel-display", },
 282         { /* sentinel */ }
 283 };
 284 MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
 285
 286 static struct platform_driver imx_pd_driver = {
 287         .probe          = imx_pd_probe,
 288         .remove         = imx_pd_remove,
 289         .driver         = {
 290                 .of_match_table = imx_pd_dt_ids,
 291                 .name   = "imx-parallel-display",
 292         },
 293 };
 294
 295 module_platform_driver(imx_pd_driver);
 296
 297 MODULE_DESCRIPTION("i.MX parallel display driver");
 298 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 299 MODULE_LICENSE("GPL");
 300 MODULE_ALIAS("platform:imx-parallel-display");