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_fb_helper.h>
  20 #include <drm/drm_crtc_helper.h>
  21 #include <drm/drm_panel.h>
  22 #include <linux/videodev2.h>
  23 #include <video/of_display_timing.h>
  24 #include <linux/of_graph.h>
  25
  26 #include "imx-drm.h"
  27
  28 #define con_to_imxpd(x) container_of(x, struct imx_parallel_display, connector)
  29 #define enc_to_imxpd(x) container_of(x, struct imx_parallel_display, encoder)
  30
  31 struct imx_parallel_display {
  32         struct drm_connector connector;
  33         struct drm_encoder encoder;
  34         struct device *dev;
  35         void *edid;
  36         int edid_len;
  37         u32 bus_format;
  38         int mode_valid;
  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->bus_format && di->num_bus_formats)
  61                         imxpd->bus_format = di->bus_formats[0];
  62                 if (num_modes > 0)
  63                         return num_modes;
  64         }
  65
  66         if (imxpd->edid) {
  67                 drm_mode_connector_update_edid_property(connector, imxpd->edid);
  68                 num_modes = drm_add_edid_modes(connector, imxpd->edid);
  69         }
  70
  71         if (imxpd->mode_valid) {
  72                 struct drm_display_mode *mode = drm_mode_create(connector->dev);
  73
  74                 if (!mode)
  75                         return -EINVAL;
  76                 drm_mode_copy(mode, &imxpd->mode);
  77                 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
  78                 drm_mode_probed_add(connector, mode);
  79                 num_modes++;
  80         }
  81
  82         if (np) {
  83                 struct drm_display_mode *mode = drm_mode_create(connector->dev);
  84
  85                 if (!mode)
  86                         return -EINVAL;
  87                 of_get_drm_display_mode(np, &imxpd->mode, OF_USE_NATIVE_MODE);
  88                 drm_mode_copy(mode, &imxpd->mode);
  89                 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
  90                 drm_mode_probed_add(connector, mode);
  91                 num_modes++;
  92         }
  93
  94         return num_modes;
  95 }
  96
  97 static struct drm_encoder *imx_pd_connector_best_encoder(
  98                 struct drm_connector *connector)
  99 {
 100         struct imx_parallel_display *imxpd = con_to_imxpd(connector);
 101
 102         return &imxpd->encoder;
 103 }
 104
 105 static void imx_pd_encoder_dpms(struct drm_encoder *encoder, int mode)
 106 {
 107         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 108
 109         if (mode != DRM_MODE_DPMS_ON)
 110                 drm_panel_disable(imxpd->panel);
 111         else
 112                 drm_panel_enable(imxpd->panel);
 113 }
 114
 115 static void imx_pd_encoder_prepare(struct drm_encoder *encoder)
 116 {
 117         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 118
 119         imx_drm_set_bus_format(encoder, imxpd->bus_format);
 120 }
 121
 122 static void imx_pd_encoder_commit(struct drm_encoder *encoder)
 123 {
 124         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 125
 126         drm_panel_prepare(imxpd->panel);
 127         drm_panel_enable(imxpd->panel);
 128 }
 129
 130 static void imx_pd_encoder_mode_set(struct drm_encoder *encoder,
 131                          struct drm_display_mode *orig_mode,
 132                          struct drm_display_mode *mode)
 133 {
 134 }
 135
 136 static void imx_pd_encoder_disable(struct drm_encoder *encoder)
 137 {
 138         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 139
 140         drm_panel_disable(imxpd->panel);
 141         drm_panel_unprepare(imxpd->panel);
 142 }
 143
 144 static const struct drm_connector_funcs imx_pd_connector_funcs = {
 145         .dpms = drm_helper_connector_dpms,
 146         .fill_modes = drm_helper_probe_single_connector_modes,
 147         .detect = imx_pd_connector_detect,
 148         .destroy = imx_drm_connector_destroy,
 149 };
 150
 151 static const struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
 152         .get_modes = imx_pd_connector_get_modes,
 153         .best_encoder = imx_pd_connector_best_encoder,
 154 };
 155
 156 static const struct drm_encoder_funcs imx_pd_encoder_funcs = {
 157         .destroy = imx_drm_encoder_destroy,
 158 };
 159
 160 static const struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = {
 161         .dpms = imx_pd_encoder_dpms,
 162         .prepare = imx_pd_encoder_prepare,
 163         .commit = imx_pd_encoder_commit,
 164         .mode_set = imx_pd_encoder_mode_set,
 165         .disable = imx_pd_encoder_disable,
 166 };
 167
 168 static int imx_pd_register(struct drm_device *drm,
 169         struct imx_parallel_display *imxpd)
 170 {
 171         int ret;
 172
 173         ret = imx_drm_encoder_parse_of(drm, &imxpd->encoder,
 174                                        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(&imxpd->encoder, &imx_pd_encoder_helper_funcs);
 186         drm_encoder_init(drm, &imxpd->encoder, &imx_pd_encoder_funcs,
 187                          DRM_MODE_ENCODER_NONE, NULL);
 188
 189         drm_connector_helper_add(&imxpd->connector,
 190                         &imx_pd_connector_helper_funcs);
 191         drm_connector_init(drm, &imxpd->connector, &imx_pd_connector_funcs,
 192                            DRM_MODE_CONNECTOR_VGA);
 193
 194         if (imxpd->panel)
 195                 drm_panel_attach(imxpd->panel, &imxpd->connector);
 196
 197         drm_mode_connector_attach_encoder(&imxpd->connector, &imxpd->encoder);
 198
 199         return 0;
 200 }
 201
 202 static int imx_pd_bind(struct device *dev, struct device *master, void *data)
 203 {
 204         struct drm_device *drm = data;
 205         struct device_node *np = dev->of_node;
 206         struct device_node *port;
 207         const u8 *edidp;
 208         struct imx_parallel_display *imxpd;
 209         int ret;
 210         const char *fmt;
 211
 212         imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL);
 213         if (!imxpd)
 214                 return -ENOMEM;
 215
 216         edidp = of_get_property(np, "edid", &imxpd->edid_len);
 217         if (edidp)
 218                 imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);
 219
 220         ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
 221         if (!ret) {
 222                 if (!strcmp(fmt, "rgb24"))
 223                         imxpd->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 224                 else if (!strcmp(fmt, "rgb565"))
 225                         imxpd->bus_format = MEDIA_BUS_FMT_RGB565_1X16;
 226                 else if (!strcmp(fmt, "bgr666"))
 227                         imxpd->bus_format = MEDIA_BUS_FMT_RGB666_1X18;
 228                 else if (!strcmp(fmt, "lvds666"))
 229                         imxpd->bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
 230         }
 231
 232         /* port@1 is the output port */
 233         port = of_graph_get_port_by_id(np, 1);
 234         if (port) {
 235                 struct device_node *endpoint, *remote;
 236
 237                 endpoint = of_get_child_by_name(port, "endpoint");
 238                 if (endpoint) {
 239                         remote = of_graph_get_remote_port_parent(endpoint);
 240                         if (remote)
 241                                 imxpd->panel = of_drm_find_panel(remote);
 242                         if (!imxpd->panel)
 243                                 return -EPROBE_DEFER;
 244                 }
 245         }
 246
 247         imxpd->dev = dev;
 248
 249         ret = imx_pd_register(drm, imxpd);
 250         if (ret)
 251                 return ret;
 252
 253         dev_set_drvdata(dev, imxpd);
 254
 255         return 0;
 256 }
 257
 258 static void imx_pd_unbind(struct device *dev, struct device *master,
 259         void *data)
 260 {
 261         struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
 262
 263         imxpd->encoder.funcs->destroy(&imxpd->encoder);
 264         imxpd->connector.funcs->destroy(&imxpd->connector);
 265
 266         kfree(imxpd->edid);
 267 }
 268
 269 static const struct component_ops imx_pd_ops = {
 270         .bind   = imx_pd_bind,
 271         .unbind = imx_pd_unbind,
 272 };
 273
 274 static int imx_pd_probe(struct platform_device *pdev)
 275 {
 276         return component_add(&pdev->dev, &imx_pd_ops);
 277 }
 278
 279 static int imx_pd_remove(struct platform_device *pdev)
 280 {
 281         component_del(&pdev->dev, &imx_pd_ops);
 282
 283         return 0;
 284 }
 285
 286 static const struct of_device_id imx_pd_dt_ids[] = {
 287         { .compatible = "fsl,imx-parallel-display", },
 288         { /* sentinel */ }
 289 };
 290 MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
 291
 292 static struct platform_driver imx_pd_driver = {
 293         .probe          = imx_pd_probe,
 294         .remove         = imx_pd_remove,
 295         .driver         = {
 296                 .of_match_table = imx_pd_dt_ids,
 297                 .name   = "imx-parallel-display",
 298         },
 299 };
 300
 301 module_platform_driver(imx_pd_driver);
 302
 303 MODULE_DESCRIPTION("i.MX parallel display driver");
 304 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 305 MODULE_LICENSE("GPL");
 306 MODULE_ALIAS("platform:imx-parallel-display");