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         struct drm_display_mode mode;
  39         struct drm_panel *panel;
  40 };
  41
  42 static enum drm_connector_status imx_pd_connector_detect(
  43                 struct drm_connector *connector, bool force)
  44 {
  45         return connector_status_connected;
  46 }
  47
  48 static int imx_pd_connector_get_modes(struct drm_connector *connector)
  49 {
  50         struct imx_parallel_display *imxpd = con_to_imxpd(connector);
  51         struct device_node *np = imxpd->dev->of_node;
  52         int num_modes = 0;
  53
  54         if (imxpd->panel && imxpd->panel->funcs &&
  55             imxpd->panel->funcs->get_modes) {
  56                 struct drm_display_info *di = &connector->display_info;
  57
  58                 num_modes = imxpd->panel->funcs->get_modes(imxpd->panel);
  59                 if (!imxpd->bus_format && di->num_bus_formats)
  60                         imxpd->bus_format = di->bus_formats[0];
  61                 if (num_modes > 0)
  62                         return num_modes;
  63         }
  64
  65         if (imxpd->edid) {
  66                 drm_mode_connector_update_edid_property(connector, imxpd->edid);
  67                 num_modes = drm_add_edid_modes(connector, imxpd->edid);
  68         }
  69
  70         if (np) {
  71                 struct drm_display_mode *mode = drm_mode_create(connector->dev);
  72
  73                 if (!mode)
  74                         return -EINVAL;
  75                 of_get_drm_display_mode(np, &imxpd->mode, OF_USE_NATIVE_MODE);
  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         return num_modes;
  83 }
  84
  85 static struct drm_encoder *imx_pd_connector_best_encoder(
  86                 struct drm_connector *connector)
  87 {
  88         struct imx_parallel_display *imxpd = con_to_imxpd(connector);
  89
  90         return &imxpd->encoder;
  91 }
  92
  93 static void imx_pd_encoder_dpms(struct drm_encoder *encoder, int mode)
  94 {
  95         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
  96
  97         if (mode != DRM_MODE_DPMS_ON)
  98                 drm_panel_disable(imxpd->panel);
  99         else
 100                 drm_panel_enable(imxpd->panel);
 101 }
 102
 103 static void imx_pd_encoder_prepare(struct drm_encoder *encoder)
 104 {
 105         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 106         imx_drm_set_bus_config(encoder, imxpd->bus_format, 2, 3,
 107                                imxpd->connector.display_info.bus_flags);
 108 }
 109
 110 static void imx_pd_encoder_commit(struct drm_encoder *encoder)
 111 {
 112         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 113
 114         drm_panel_prepare(imxpd->panel);
 115         drm_panel_enable(imxpd->panel);
 116 }
 117
 118 static void imx_pd_encoder_mode_set(struct drm_encoder *encoder,
 119                          struct drm_display_mode *orig_mode,
 120                          struct drm_display_mode *mode)
 121 {
 122 }
 123
 124 static void imx_pd_encoder_disable(struct drm_encoder *encoder)
 125 {
 126         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 127
 128         drm_panel_disable(imxpd->panel);
 129         drm_panel_unprepare(imxpd->panel);
 130 }
 131
 132 static const struct drm_connector_funcs imx_pd_connector_funcs = {
 133         .dpms = drm_helper_connector_dpms,
 134         .fill_modes = drm_helper_probe_single_connector_modes,
 135         .detect = imx_pd_connector_detect,
 136         .destroy = imx_drm_connector_destroy,
 137 };
 138
 139 static const struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
 140         .get_modes = imx_pd_connector_get_modes,
 141         .best_encoder = imx_pd_connector_best_encoder,
 142 };
 143
 144 static const struct drm_encoder_funcs imx_pd_encoder_funcs = {
 145         .destroy = imx_drm_encoder_destroy,
 146 };
 147
 148 static const struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = {
 149         .dpms = imx_pd_encoder_dpms,
 150         .prepare = imx_pd_encoder_prepare,
 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->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->encoder, &imx_pd_encoder_helper_funcs);
 174         drm_encoder_init(drm, &imxpd->encoder, &imx_pd_encoder_funcs,
 175                          DRM_MODE_ENCODER_NONE, NULL);
 176
 177         drm_connector_helper_add(&imxpd->connector,
 178                         &imx_pd_connector_helper_funcs);
 179         drm_connector_init(drm, &imxpd->connector, &imx_pd_connector_funcs,
 180                            DRM_MODE_CONNECTOR_VGA);
 181
 182         if (imxpd->panel)
 183                 drm_panel_attach(imxpd->panel, &imxpd->connector);
 184
 185         drm_mode_connector_attach_encoder(&imxpd->connector, &imxpd->encoder);
 186
 187         return 0;
 188 }
 189
 190 static int imx_pd_bind(struct device *dev, struct device *master, void *data)
 191 {
 192         struct drm_device *drm = data;
 193         struct device_node *np = dev->of_node;
 194         struct device_node *ep;
 195         const u8 *edidp;
 196         struct imx_parallel_display *imxpd;
 197         int ret;
 198         const char *fmt;
 199
 200         imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL);
 201         if (!imxpd)
 202                 return -ENOMEM;
 203
 204         edidp = of_get_property(np, "edid", &imxpd->edid_len);
 205         if (edidp)
 206                 imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);
 207
 208         ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
 209         if (!ret) {
 210                 if (!strcmp(fmt, "rgb24"))
 211                         imxpd->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 212                 else if (!strcmp(fmt, "rgb565"))
 213                         imxpd->bus_format = MEDIA_BUS_FMT_RGB565_1X16;
 214                 else if (!strcmp(fmt, "bgr666"))
 215                         imxpd->bus_format = MEDIA_BUS_FMT_RGB666_1X18;
 216                 else if (!strcmp(fmt, "lvds666"))
 217                         imxpd->bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
 218         }
 219
 220         /* port@1 is the output port */
 221         ep = of_graph_get_endpoint_by_regs(np, 1, -1);
 222         if (ep) {
 223                 struct device_node *remote;
 224
 225                 remote = of_graph_get_remote_port_parent(ep);
 226                 of_node_put(ep);
 227                 if (remote) {
 228                         imxpd->panel = of_drm_find_panel(remote);
 229                         of_node_put(remote);
 230                 }
 231                 if (!imxpd->panel)
 232                         return -EPROBE_DEFER;
 233         }
 234
 235         imxpd->dev = dev;
 236
 237         ret = imx_pd_register(drm, imxpd);
 238         if (ret)
 239                 return ret;
 240
 241         dev_set_drvdata(dev, imxpd);
 242
 243         return 0;
 244 }
 245
 246 static void imx_pd_unbind(struct device *dev, struct device *master,
 247         void *data)
 248 {
 249         struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
 250
 251         imxpd->encoder.funcs->destroy(&imxpd->encoder);
 252         imxpd->connector.funcs->destroy(&imxpd->connector);
 253
 254         kfree(imxpd->edid);
 255 }
 256
 257 static const struct component_ops imx_pd_ops = {
 258         .bind   = imx_pd_bind,
 259         .unbind = imx_pd_unbind,
 260 };
 261
 262 static int imx_pd_probe(struct platform_device *pdev)
 263 {
 264         return component_add(&pdev->dev, &imx_pd_ops);
 265 }
 266
 267 static int imx_pd_remove(struct platform_device *pdev)
 268 {
 269         component_del(&pdev->dev, &imx_pd_ops);
 270
 271         return 0;
 272 }
 273
 274 static const struct of_device_id imx_pd_dt_ids[] = {
 275         { .compatible = "fsl,imx-parallel-display", },
 276         { /* sentinel */ }
 277 };
 278 MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
 279
 280 static struct platform_driver imx_pd_driver = {
 281         .probe          = imx_pd_probe,
 282         .remove         = imx_pd_remove,
 283         .driver         = {
 284                 .of_match_table = imx_pd_dt_ids,
 285                 .name   = "imx-parallel-display",
 286         },
 287 };
 288
 289 module_platform_driver(imx_pd_driver);
 290
 291 MODULE_DESCRIPTION("i.MX parallel display driver");
 292 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 293 MODULE_LICENSE("GPL");
 294 MODULE_ALIAS("platform:imx-parallel-display");