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                 num_modes = imxpd->panel->funcs->get_modes(imxpd->panel);
  58                 if (num_modes > 0)
  59                         return num_modes;
  60         }
  61
  62         if (imxpd->edid) {
  63                 drm_mode_connector_update_edid_property(connector, imxpd->edid);
  64                 num_modes = drm_add_edid_modes(connector, imxpd->edid);
  65         }
  66
  67         if (imxpd->mode_valid) {
  68                 struct drm_display_mode *mode = drm_mode_create(connector->dev);
  69
  70                 if (!mode)
  71                         return -EINVAL;
  72                 drm_mode_copy(mode, &imxpd->mode);
  73                 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
  74                 drm_mode_probed_add(connector, mode);
  75                 num_modes++;
  76         }
  77
  78         if (np) {
  79                 struct drm_display_mode *mode = drm_mode_create(connector->dev);
  80
  81                 if (!mode)
  82                         return -EINVAL;
  83                 of_get_drm_display_mode(np, &imxpd->mode, OF_USE_NATIVE_MODE);
  84                 drm_mode_copy(mode, &imxpd->mode);
  85                 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
  86                 drm_mode_probed_add(connector, mode);
  87                 num_modes++;
  88         }
  89
  90         return num_modes;
  91 }
  92
  93 static struct drm_encoder *imx_pd_connector_best_encoder(
  94                 struct drm_connector *connector)
  95 {
  96         struct imx_parallel_display *imxpd = con_to_imxpd(connector);
  97
  98         return &imxpd->encoder;
  99 }
 100
 101 static void imx_pd_encoder_dpms(struct drm_encoder *encoder, int mode)
 102 {
 103         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 104
 105         if (mode != DRM_MODE_DPMS_ON)
 106                 drm_panel_disable(imxpd->panel);
 107         else
 108                 drm_panel_enable(imxpd->panel);
 109 }
 110
 111 static bool imx_pd_encoder_mode_fixup(struct drm_encoder *encoder,
 112                            const struct drm_display_mode *mode,
 113                            struct drm_display_mode *adjusted_mode)
 114 {
 115         return true;
 116 }
 117
 118 static void imx_pd_encoder_prepare(struct drm_encoder *encoder)
 119 {
 120         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 121
 122         imx_drm_set_bus_format(encoder, imxpd->bus_format);
 123 }
 124
 125 static void imx_pd_encoder_commit(struct drm_encoder *encoder)
 126 {
 127         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 128
 129         drm_panel_prepare(imxpd->panel);
 130         drm_panel_enable(imxpd->panel);
 131 }
 132
 133 static void imx_pd_encoder_mode_set(struct drm_encoder *encoder,
 134                          struct drm_display_mode *orig_mode,
 135                          struct drm_display_mode *mode)
 136 {
 137 }
 138
 139 static void imx_pd_encoder_disable(struct drm_encoder *encoder)
 140 {
 141         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 142
 143         drm_panel_disable(imxpd->panel);
 144         drm_panel_unprepare(imxpd->panel);
 145 }
 146
 147 static struct drm_connector_funcs imx_pd_connector_funcs = {
 148         .dpms = drm_helper_connector_dpms,
 149         .fill_modes = drm_helper_probe_single_connector_modes,
 150         .detect = imx_pd_connector_detect,
 151         .destroy = imx_drm_connector_destroy,
 152 };
 153
 154 static struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
 155         .get_modes = imx_pd_connector_get_modes,
 156         .best_encoder = imx_pd_connector_best_encoder,
 157 };
 158
 159 static struct drm_encoder_funcs imx_pd_encoder_funcs = {
 160         .destroy = imx_drm_encoder_destroy,
 161 };
 162
 163 static struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = {
 164         .dpms = imx_pd_encoder_dpms,
 165         .mode_fixup = imx_pd_encoder_mode_fixup,
 166         .prepare = imx_pd_encoder_prepare,
 167         .commit = imx_pd_encoder_commit,
 168         .mode_set = imx_pd_encoder_mode_set,
 169         .disable = imx_pd_encoder_disable,
 170 };
 171
 172 static int imx_pd_register(struct drm_device *drm,
 173         struct imx_parallel_display *imxpd)
 174 {
 175         int ret;
 176
 177         ret = imx_drm_encoder_parse_of(drm, &imxpd->encoder,
 178                                        imxpd->dev->of_node);
 179         if (ret)
 180                 return ret;
 181
 182         /* set the connector's dpms to OFF so that
 183          * drm_helper_connector_dpms() won't return
 184          * immediately since the current state is ON
 185          * at this point.
 186          */
 187         imxpd->connector.dpms = DRM_MODE_DPMS_OFF;
 188
 189         drm_encoder_helper_add(&imxpd->encoder, &imx_pd_encoder_helper_funcs);
 190         drm_encoder_init(drm, &imxpd->encoder, &imx_pd_encoder_funcs,
 191                          DRM_MODE_ENCODER_NONE);
 192
 193         drm_connector_helper_add(&imxpd->connector,
 194                         &imx_pd_connector_helper_funcs);
 195         drm_connector_init(drm, &imxpd->connector, &imx_pd_connector_funcs,
 196                            DRM_MODE_CONNECTOR_VGA);
 197
 198         if (imxpd->panel)
 199                 drm_panel_attach(imxpd->panel, &imxpd->connector);
 200
 201         drm_mode_connector_attach_encoder(&imxpd->connector, &imxpd->encoder);
 202
 203         imxpd->connector.encoder = &imxpd->encoder;
 204
 205         return 0;
 206 }
 207
 208 static int imx_pd_bind(struct device *dev, struct device *master, void *data)
 209 {
 210         struct drm_device *drm = data;
 211         struct device_node *np = dev->of_node;
 212         struct device_node *port;
 213         const u8 *edidp;
 214         struct imx_parallel_display *imxpd;
 215         int ret;
 216         const char *fmt;
 217
 218         imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL);
 219         if (!imxpd)
 220                 return -ENOMEM;
 221
 222         edidp = of_get_property(np, "edid", &imxpd->edid_len);
 223         if (edidp)
 224                 imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);
 225
 226         ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
 227         if (!ret) {
 228                 if (!strcmp(fmt, "rgb24"))
 229                         imxpd->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 230                 else if (!strcmp(fmt, "rgb565"))
 231                         imxpd->bus_format = MEDIA_BUS_FMT_RGB565_1X16;
 232                 else if (!strcmp(fmt, "bgr666"))
 233                         imxpd->bus_format = MEDIA_BUS_FMT_RGB666_1X18;
 234                 else if (!strcmp(fmt, "lvds666"))
 235                         imxpd->bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
 236         }
 237
 238         /* port@1 is the output port */
 239         port = of_graph_get_port_by_id(np, 1);
 240         if (port) {
 241                 struct device_node *endpoint, *remote;
 242
 243                 endpoint = of_get_child_by_name(port, "endpoint");
 244                 if (endpoint) {
 245                         remote = of_graph_get_remote_port_parent(endpoint);
 246                         if (remote)
 247                                 imxpd->panel = of_drm_find_panel(remote);
 248                         if (!imxpd->panel)
 249                                 return -EPROBE_DEFER;
 250                 }
 251         }
 252
 253         imxpd->dev = dev;
 254
 255         ret = imx_pd_register(drm, imxpd);
 256         if (ret)
 257                 return ret;
 258
 259         dev_set_drvdata(dev, imxpd);
 260
 261         return 0;
 262 }
 263
 264 static void imx_pd_unbind(struct device *dev, struct device *master,
 265         void *data)
 266 {
 267         struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
 268
 269         imxpd->encoder.funcs->destroy(&imxpd->encoder);
 270         imxpd->connector.funcs->destroy(&imxpd->connector);
 271
 272         kfree(imxpd->edid);
 273 }
 274
 275 static const struct component_ops imx_pd_ops = {
 276         .bind   = imx_pd_bind,
 277         .unbind = imx_pd_unbind,
 278 };
 279
 280 static int imx_pd_probe(struct platform_device *pdev)
 281 {
 282         return component_add(&pdev->dev, &imx_pd_ops);
 283 }
 284
 285 static int imx_pd_remove(struct platform_device *pdev)
 286 {
 287         component_del(&pdev->dev, &imx_pd_ops);
 288
 289         return 0;
 290 }
 291
 292 static const struct of_device_id imx_pd_dt_ids[] = {
 293         { .compatible = "fsl,imx-parallel-display", },
 294         { /* sentinel */ }
 295 };
 296 MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
 297
 298 static struct platform_driver imx_pd_driver = {
 299         .probe          = imx_pd_probe,
 300         .remove         = imx_pd_remove,
 301         .driver         = {
 302                 .of_match_table = imx_pd_dt_ids,
 303                 .name   = "imx-parallel-display",
 304         },
 305 };
 306
 307 module_platform_driver(imx_pd_driver);
 308
 309 MODULE_DESCRIPTION("i.MX parallel display driver");
 310 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 311 MODULE_LICENSE("GPL");
 312 MODULE_ALIAS("platform:imx-parallel-display");