kernel/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 bool imx_pd_encoder_mode_fixup(struct drm_encoder *encoder,
 116                            const struct drm_display_mode *mode,
 117                            struct drm_display_mode *adjusted_mode)
 118 {
 119         return true;
 120 }
 121
 122 static void imx_pd_encoder_prepare(struct drm_encoder *encoder)
 123 {
 124         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 125
 126         imx_drm_set_bus_format(encoder, imxpd->bus_format);
 127 }
 128
 129 static void imx_pd_encoder_commit(struct drm_encoder *encoder)
 130 {
 131         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 132
 133         drm_panel_prepare(imxpd->panel);
 134         drm_panel_enable(imxpd->panel);
 135 }
 136
 137 static void imx_pd_encoder_mode_set(struct drm_encoder *encoder,
 138                          struct drm_display_mode *orig_mode,
 139                          struct drm_display_mode *mode)
 140 {
 141 }
 142
 143 static void imx_pd_encoder_disable(struct drm_encoder *encoder)
 144 {
 145         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 146
 147         drm_panel_disable(imxpd->panel);
 148         drm_panel_unprepare(imxpd->panel);
 149 }
 150
 151 static struct drm_connector_funcs imx_pd_connector_funcs = {
 152         .dpms = drm_helper_connector_dpms,
 153         .fill_modes = drm_helper_probe_single_connector_modes,
 154         .detect = imx_pd_connector_detect,
 155         .destroy = imx_drm_connector_destroy,
 156 };
 157
 158 static struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
 159         .get_modes = imx_pd_connector_get_modes,
 160         .best_encoder = imx_pd_connector_best_encoder,
 161 };
 162
 163 static struct drm_encoder_funcs imx_pd_encoder_funcs = {
 164         .destroy = imx_drm_encoder_destroy,
 165 };
 166
 167 static struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = {
 168         .dpms = imx_pd_encoder_dpms,
 169         .mode_fixup = imx_pd_encoder_mode_fixup,
 170         .prepare = imx_pd_encoder_prepare,
 171         .commit = imx_pd_encoder_commit,
 172         .mode_set = imx_pd_encoder_mode_set,
 173         .disable = imx_pd_encoder_disable,
 174 };
 175
 176 static int imx_pd_register(struct drm_device *drm,
 177         struct imx_parallel_display *imxpd)
 178 {
 179         int ret;
 180
 181         ret = imx_drm_encoder_parse_of(drm, &imxpd->encoder,
 182                                        imxpd->dev->of_node);
 183         if (ret)
 184                 return ret;
 185
 186         /* set the connector's dpms to OFF so that
 187          * drm_helper_connector_dpms() won't return
 188          * immediately since the current state is ON
 189          * at this point.
 190          */
 191         imxpd->connector.dpms = DRM_MODE_DPMS_OFF;
 192
 193         drm_encoder_helper_add(&imxpd->encoder, &imx_pd_encoder_helper_funcs);
 194         drm_encoder_init(drm, &imxpd->encoder, &imx_pd_encoder_funcs,
 195                          DRM_MODE_ENCODER_NONE);
 196
 197         drm_connector_helper_add(&imxpd->connector,
 198                         &imx_pd_connector_helper_funcs);
 199         drm_connector_init(drm, &imxpd->connector, &imx_pd_connector_funcs,
 200                            DRM_MODE_CONNECTOR_VGA);
 201
 202         if (imxpd->panel)
 203                 drm_panel_attach(imxpd->panel, &imxpd->connector);
 204
 205         drm_mode_connector_attach_encoder(&imxpd->connector, &imxpd->encoder);
 206
 207         imxpd->connector.encoder = &imxpd->encoder;
 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 *port;
 217         const u8 *edidp;
 218         struct imx_parallel_display *imxpd;
 219         int ret;
 220         const char *fmt;
 221
 222         imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL);
 223         if (!imxpd)
 224                 return -ENOMEM;
 225
 226         edidp = of_get_property(np, "edid", &imxpd->edid_len);
 227         if (edidp)
 228                 imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);
 229
 230         ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
 231         if (!ret) {
 232                 if (!strcmp(fmt, "rgb24"))
 233                         imxpd->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 234                 else if (!strcmp(fmt, "rgb565"))
 235                         imxpd->bus_format = MEDIA_BUS_FMT_RGB565_1X16;
 236                 else if (!strcmp(fmt, "bgr666"))
 237                         imxpd->bus_format = MEDIA_BUS_FMT_RGB666_1X18;
 238                 else if (!strcmp(fmt, "lvds666"))
 239                         imxpd->bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
 240         }
 241
 242         /* port@1 is the output port */
 243         port = of_graph_get_port_by_id(np, 1);
 244         if (port) {
 245                 struct device_node *endpoint, *remote;
 246
 247                 endpoint = of_get_child_by_name(port, "endpoint");
 248                 if (endpoint) {
 249                         remote = of_graph_get_remote_port_parent(endpoint);
 250                         if (remote)
 251                                 imxpd->panel = of_drm_find_panel(remote);
 252                         if (!imxpd->panel)
 253                                 return -EPROBE_DEFER;
 254                 }
 255         }
 256
 257         imxpd->dev = dev;
 258
 259         ret = imx_pd_register(drm, imxpd);
 260         if (ret)
 261                 return ret;
 262
 263         dev_set_drvdata(dev, imxpd);
 264
 265         return 0;
 266 }
 267
 268 static void imx_pd_unbind(struct device *dev, struct device *master,
 269         void *data)
 270 {
 271         struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
 272
 273         imxpd->encoder.funcs->destroy(&imxpd->encoder);
 274         imxpd->connector.funcs->destroy(&imxpd->connector);
 275
 276         kfree(imxpd->edid);
 277 }
 278
 279 static const struct component_ops imx_pd_ops = {
 280         .bind   = imx_pd_bind,
 281         .unbind = imx_pd_unbind,
 282 };
 283
 284 static int imx_pd_probe(struct platform_device *pdev)
 285 {
 286         return component_add(&pdev->dev, &imx_pd_ops);
 287 }
 288
 289 static int imx_pd_remove(struct platform_device *pdev)
 290 {
 291         component_del(&pdev->dev, &imx_pd_ops);
 292
 293         return 0;
 294 }
 295
 296 static const struct of_device_id imx_pd_dt_ids[] = {
 297         { .compatible = "fsl,imx-parallel-display", },
 298         { /* sentinel */ }
 299 };
 300 MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
 301
 302 static struct platform_driver imx_pd_driver = {
 303         .probe          = imx_pd_probe,
 304         .remove         = imx_pd_remove,
 305         .driver         = {
 306                 .of_match_table = imx_pd_dt_ids,
 307                 .name   = "imx-parallel-display",
 308         },
 309 };
 310
 311 module_platform_driver(imx_pd_driver);
 312
 313 MODULE_DESCRIPTION("i.MX parallel display driver");
 314 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 315 MODULE_LICENSE("GPL");
 316 MODULE_ALIAS("platform:imx-parallel-display");