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
  25 #include "imx-drm.h"
  26
  27 #define con_to_imxpd(x) container_of(x, struct imx_parallel_display, connector)
  28 #define enc_to_imxpd(x) container_of(x, struct imx_parallel_display, encoder)
  29
  30 struct imx_parallel_display {
  31         struct drm_connector connector;
  32         struct drm_encoder encoder;
  33         struct device *dev;
  34         void *edid;
  35         int edid_len;
  36         u32 bus_format;
  37         int mode_valid;
  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                 num_modes = imxpd->panel->funcs->get_modes(imxpd->panel);
  57                 if (num_modes > 0)
  58                         return num_modes;
  59         }
  60
  61         if (imxpd->edid) {
  62                 drm_mode_connector_update_edid_property(connector, imxpd->edid);
  63                 num_modes = drm_add_edid_modes(connector, imxpd->edid);
  64         }
  65
  66         if (imxpd->mode_valid) {
  67                 struct drm_display_mode *mode = drm_mode_create(connector->dev);
  68
  69                 if (!mode)
  70                         return -EINVAL;
  71                 drm_mode_copy(mode, &imxpd->mode);
  72                 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
  73                 drm_mode_probed_add(connector, mode);
  74                 num_modes++;
  75         }
  76
  77         if (np) {
  78                 struct drm_display_mode *mode = drm_mode_create(connector->dev);
  79
  80                 if (!mode)
  81                         return -EINVAL;
  82                 of_get_drm_display_mode(np, &imxpd->mode, OF_USE_NATIVE_MODE);
  83                 drm_mode_copy(mode, &imxpd->mode);
  84                 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
  85                 drm_mode_probed_add(connector, mode);
  86                 num_modes++;
  87         }
  88
  89         return num_modes;
  90 }
  91
  92 static struct drm_encoder *imx_pd_connector_best_encoder(
  93                 struct drm_connector *connector)
  94 {
  95         struct imx_parallel_display *imxpd = con_to_imxpd(connector);
  96
  97         return &imxpd->encoder;
  98 }
  99
 100 static void imx_pd_encoder_dpms(struct drm_encoder *encoder, int mode)
 101 {
 102         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 103
 104         if (mode != DRM_MODE_DPMS_ON)
 105                 drm_panel_disable(imxpd->panel);
 106         else
 107                 drm_panel_enable(imxpd->panel);
 108 }
 109
 110 static bool imx_pd_encoder_mode_fixup(struct drm_encoder *encoder,
 111                            const struct drm_display_mode *mode,
 112                            struct drm_display_mode *adjusted_mode)
 113 {
 114         return true;
 115 }
 116
 117 static void imx_pd_encoder_prepare(struct drm_encoder *encoder)
 118 {
 119         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 120
 121         imx_drm_set_bus_format(encoder, imxpd->bus_format);
 122 }
 123
 124 static void imx_pd_encoder_commit(struct drm_encoder *encoder)
 125 {
 126         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 127
 128         drm_panel_prepare(imxpd->panel);
 129         drm_panel_enable(imxpd->panel);
 130 }
 131
 132 static void imx_pd_encoder_mode_set(struct drm_encoder *encoder,
 133                          struct drm_display_mode *orig_mode,
 134                          struct drm_display_mode *mode)
 135 {
 136 }
 137
 138 static void imx_pd_encoder_disable(struct drm_encoder *encoder)
 139 {
 140         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 141
 142         drm_panel_disable(imxpd->panel);
 143         drm_panel_unprepare(imxpd->panel);
 144 }
 145
 146 static struct drm_connector_funcs imx_pd_connector_funcs = {
 147         .dpms = drm_helper_connector_dpms,
 148         .fill_modes = drm_helper_probe_single_connector_modes,
 149         .detect = imx_pd_connector_detect,
 150         .destroy = imx_drm_connector_destroy,
 151 };
 152
 153 static struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
 154         .get_modes = imx_pd_connector_get_modes,
 155         .best_encoder = imx_pd_connector_best_encoder,
 156 };
 157
 158 static struct drm_encoder_funcs imx_pd_encoder_funcs = {
 159         .destroy = imx_drm_encoder_destroy,
 160 };
 161
 162 static struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = {
 163         .dpms = imx_pd_encoder_dpms,
 164         .mode_fixup = imx_pd_encoder_mode_fixup,
 165         .prepare = imx_pd_encoder_prepare,
 166         .commit = imx_pd_encoder_commit,
 167         .mode_set = imx_pd_encoder_mode_set,
 168         .disable = imx_pd_encoder_disable,
 169 };
 170
 171 static int imx_pd_register(struct drm_device *drm,
 172         struct imx_parallel_display *imxpd)
 173 {
 174         int ret;
 175
 176         ret = imx_drm_encoder_parse_of(drm, &imxpd->encoder,
 177                                        imxpd->dev->of_node);
 178         if (ret)
 179                 return ret;
 180
 181         /* set the connector's dpms to OFF so that
 182          * drm_helper_connector_dpms() won't return
 183          * immediately since the current state is ON
 184          * at this point.
 185          */
 186         imxpd->connector.dpms = DRM_MODE_DPMS_OFF;
 187
 188         drm_encoder_helper_add(&imxpd->encoder, &imx_pd_encoder_helper_funcs);
 189         drm_encoder_init(drm, &imxpd->encoder, &imx_pd_encoder_funcs,
 190                          DRM_MODE_ENCODER_NONE);
 191
 192         drm_connector_helper_add(&imxpd->connector,
 193                         &imx_pd_connector_helper_funcs);
 194         drm_connector_init(drm, &imxpd->connector, &imx_pd_connector_funcs,
 195                            DRM_MODE_CONNECTOR_VGA);
 196
 197         if (imxpd->panel)
 198                 drm_panel_attach(imxpd->panel, &imxpd->connector);
 199
 200         drm_mode_connector_attach_encoder(&imxpd->connector, &imxpd->encoder);
 201
 202         imxpd->connector.encoder = &imxpd->encoder;
 203
 204         return 0;
 205 }
 206
 207 static int imx_pd_bind(struct device *dev, struct device *master, void *data)
 208 {
 209         struct drm_device *drm = data;
 210         struct device_node *np = dev->of_node;
 211         struct device_node *panel_node;
 212         const u8 *edidp;
 213         struct imx_parallel_display *imxpd;
 214         int ret;
 215         const char *fmt;
 216
 217         imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL);
 218         if (!imxpd)
 219                 return -ENOMEM;
 220
 221         edidp = of_get_property(np, "edid", &imxpd->edid_len);
 222         if (edidp)
 223                 imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);
 224
 225         ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
 226         if (!ret) {
 227                 if (!strcmp(fmt, "rgb24"))
 228                         imxpd->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 229                 else if (!strcmp(fmt, "rgb565"))
 230                         imxpd->bus_format = MEDIA_BUS_FMT_RGB565_1X16;
 231                 else if (!strcmp(fmt, "bgr666"))
 232                         imxpd->bus_format = MEDIA_BUS_FMT_RGB666_1X18;
 233                 else if (!strcmp(fmt, "lvds666"))
 234                         imxpd->bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
 235         }
 236
 237         panel_node = of_parse_phandle(np, "fsl,panel", 0);
 238         if (panel_node) {
 239                 imxpd->panel = of_drm_find_panel(panel_node);
 240                 if (!imxpd->panel)
 241                         return -EPROBE_DEFER;
 242         }
 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         imxpd->encoder.funcs->destroy(&imxpd->encoder);
 261         imxpd->connector.funcs->destroy(&imxpd->connector);
 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");