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