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_of.h>
  23 #include <drm/drm_panel.h>
  24 #include <linux/videodev2.h>
  25 #include <video/of_display_timing.h>
  26
  27 #include "imx-drm.h"
  28
  29 struct imx_parallel_display {
  30         struct drm_connector connector;
  31         struct drm_encoder encoder;
  32         struct device *dev;
  33         void *edid;
  34         int edid_len;
  35         u32 bus_format;
  36         u32 bus_flags;
  37         struct drm_display_mode mode;
  38         struct drm_panel *panel;
  39         struct drm_bridge *bridge;
  40 };
  41
  42 static inline struct imx_parallel_display *con_to_imxpd(struct drm_connector *c)
  43 {
  44         return container_of(c, struct imx_parallel_display, connector);
  45 }
  46
  47 static inline struct imx_parallel_display *enc_to_imxpd(struct drm_encoder *e)
  48 {
  49         return container_of(e, struct imx_parallel_display, encoder);
  50 }
  51
  52 static int imx_pd_connector_get_modes(struct drm_connector *connector)
  53 {
  54         struct imx_parallel_display *imxpd = con_to_imxpd(connector);
  55         struct device_node *np = imxpd->dev->of_node;
  56         int num_modes = 0;
  57
  58         if (imxpd->panel && imxpd->panel->funcs &&
  59             imxpd->panel->funcs->get_modes) {
  60                 num_modes = imxpd->panel->funcs->get_modes(imxpd->panel);
  61                 if (num_modes > 0)
  62                         return num_modes;
  63         }
  64
  65         if (imxpd->edid) {
  66                 drm_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                 int ret;
  73
  74                 if (!mode)
  75                         return -EINVAL;
  76
  77                 ret = of_get_drm_display_mode(np, &imxpd->mode,
  78                                               &imxpd->bus_flags,
  79                                               OF_USE_NATIVE_MODE);
  80                 if (ret) {
  81                         drm_mode_destroy(connector->dev, mode);
  82                         return ret;
  83                 }
  84
  85                 drm_mode_copy(mode, &imxpd->mode);
  86                 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
  87                 drm_mode_probed_add(connector, mode);
  88                 num_modes++;
  89         }
  90
  91         return num_modes;
  92 }
  93
  94 static struct drm_encoder *imx_pd_connector_best_encoder(
  95                 struct drm_connector *connector)
  96 {
  97         struct imx_parallel_display *imxpd = con_to_imxpd(connector);
  98
  99         return &imxpd->encoder;
 100 }
 101
 102 static void imx_pd_encoder_enable(struct drm_encoder *encoder)
 103 {
 104         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 105
 106         drm_panel_prepare(imxpd->panel);
 107         drm_panel_enable(imxpd->panel);
 108 }
 109
 110 static void imx_pd_encoder_disable(struct drm_encoder *encoder)
 111 {
 112         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 113
 114         drm_panel_disable(imxpd->panel);
 115         drm_panel_unprepare(imxpd->panel);
 116 }
 117
 118 static int imx_pd_encoder_atomic_check(struct drm_encoder *encoder,
 119                                        struct drm_crtc_state *crtc_state,
 120                                        struct drm_connector_state *conn_state)
 121 {
 122         struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
 123         struct drm_display_info *di = &conn_state->connector->display_info;
 124         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 125
 126         if (!imxpd->bus_format && di->num_bus_formats) {
 127                 imx_crtc_state->bus_flags = di->bus_flags;
 128                 imx_crtc_state->bus_format = di->bus_formats[0];
 129         } else {
 130                 imx_crtc_state->bus_flags = imxpd->bus_flags;
 131                 imx_crtc_state->bus_format = imxpd->bus_format;
 132         }
 133         imx_crtc_state->di_hsync_pin = 2;
 134         imx_crtc_state->di_vsync_pin = 3;
 135
 136         return 0;
 137 }
 138
 139 static const struct drm_connector_funcs imx_pd_connector_funcs = {
 140         .fill_modes = drm_helper_probe_single_connector_modes,
 141         .destroy = imx_drm_connector_destroy,
 142         .reset = drm_atomic_helper_connector_reset,
 143         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 144         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 145 };
 146
 147 static const struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
 148         .get_modes = imx_pd_connector_get_modes,
 149         .best_encoder = imx_pd_connector_best_encoder,
 150 };
 151
 152 static const struct drm_encoder_funcs imx_pd_encoder_funcs = {
 153         .destroy = imx_drm_encoder_destroy,
 154 };
 155
 156 static const struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = {
 157         .enable = imx_pd_encoder_enable,
 158         .disable = imx_pd_encoder_disable,
 159         .atomic_check = imx_pd_encoder_atomic_check,
 160 };
 161
 162 static int imx_pd_register(struct drm_device *drm,
 163         struct imx_parallel_display *imxpd)
 164 {
 165         struct drm_encoder *encoder = &imxpd->encoder;
 166         int ret;
 167
 168         ret = imx_drm_encoder_parse_of(drm, encoder, imxpd->dev->of_node);
 169         if (ret)
 170                 return ret;
 171
 172         /* set the connector's dpms to OFF so that
 173          * drm_helper_connector_dpms() won't return
 174          * immediately since the current state is ON
 175          * at this point.
 176          */
 177         imxpd->connector.dpms = DRM_MODE_DPMS_OFF;
 178
 179         drm_encoder_helper_add(encoder, &imx_pd_encoder_helper_funcs);
 180         drm_encoder_init(drm, encoder, &imx_pd_encoder_funcs,
 181                          DRM_MODE_ENCODER_NONE, NULL);
 182
 183         if (!imxpd->bridge) {
 184                 drm_connector_helper_add(&imxpd->connector,
 185                                 &imx_pd_connector_helper_funcs);
 186                 drm_connector_init(drm, &imxpd->connector,
 187                                    &imx_pd_connector_funcs,
 188                                    DRM_MODE_CONNECTOR_DPI);
 189         }
 190
 191         if (imxpd->panel)
 192                 drm_panel_attach(imxpd->panel, &imxpd->connector);
 193
 194         if (imxpd->bridge) {
 195                 ret = drm_bridge_attach(encoder, imxpd->bridge, NULL);
 196                 if (ret < 0) {
 197                         dev_err(imxpd->dev, "failed to attach bridge: %d\n",
 198                                 ret);
 199                         return ret;
 200                 }
 201         } else {
 202                 drm_connector_attach_encoder(&imxpd->connector, encoder);
 203         }
 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         const u8 *edidp;
 213         struct imx_parallel_display *imxpd;
 214         int ret;
 215         u32 bus_format = 0;
 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                         bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 230                 else if (!strcmp(fmt, "rgb565"))
 231                         bus_format = MEDIA_BUS_FMT_RGB565_1X16;
 232                 else if (!strcmp(fmt, "bgr666"))
 233                         bus_format = MEDIA_BUS_FMT_RGB666_1X18;
 234                 else if (!strcmp(fmt, "lvds666"))
 235                         bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
 236         }
 237         imxpd->bus_format = bus_format;
 238
 239         /* port@1 is the output port */
 240         ret = drm_of_find_panel_or_bridge(np, 1, 0, &imxpd->panel, &imxpd->bridge);
 241         if (ret && ret != -ENODEV)
 242                 return ret;
 243
 244         imxpd->dev = dev;
 245
 246         ret = imx_pd_register(drm, imxpd);
 247         if (ret)
 248                 return ret;
 249
 250         dev_set_drvdata(dev, imxpd);
 251
 252         return 0;
 253 }
 254
 255 static void imx_pd_unbind(struct device *dev, struct device *master,
 256         void *data)
 257 {
 258         struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
 259
 260         if (imxpd->panel)
 261                 drm_panel_detach(imxpd->panel);
 262
 263         kfree(imxpd->edid);
 264 }
 265
 266 static const struct component_ops imx_pd_ops = {
 267         .bind   = imx_pd_bind,
 268         .unbind = imx_pd_unbind,
 269 };
 270
 271 static int imx_pd_probe(struct platform_device *pdev)
 272 {
 273         return component_add(&pdev->dev, &imx_pd_ops);
 274 }
 275
 276 static int imx_pd_remove(struct platform_device *pdev)
 277 {
 278         component_del(&pdev->dev, &imx_pd_ops);
 279
 280         return 0;
 281 }
 282
 283 static const struct of_device_id imx_pd_dt_ids[] = {
 284         { .compatible = "fsl,imx-parallel-display", },
 285         { /* sentinel */ }
 286 };
 287 MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
 288
 289 static struct platform_driver imx_pd_driver = {
 290         .probe          = imx_pd_probe,
 291         .remove         = imx_pd_remove,
 292         .driver         = {
 293                 .of_match_table = imx_pd_dt_ids,
 294                 .name   = "imx-parallel-display",
 295         },
 296 };
 297
 298 module_platform_driver(imx_pd_driver);
 299
 300 MODULE_DESCRIPTION("i.MX parallel display driver");
 301 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 302 MODULE_LICENSE("GPL");
 303 MODULE_ALIAS("platform:imx-parallel-display");