drivers/gpu/drm/imx/parallel-display.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * i.MX drm driver - parallel display implementation
   4  *
   5  * Copyright (C) 2012 Sascha Hauer, Pengutronix
   6  */
   7
   8 #include <linux/component.h>
   9 #include <linux/module.h>
  10 #include <linux/platform_device.h>
  11 #include <linux/videodev2.h>
  12
  13 #include <video/of_display_timing.h>
  14
  15 #include <drm/drm_atomic_helper.h>
  16 #include <drm/drm_fb_helper.h>
  17 #include <drm/drm_of.h>
  18 #include <drm/drm_panel.h>
  19 #include <drm/drm_probe_helper.h>
  20
  21 #include "imx-drm.h"
  22
  23 struct imx_parallel_display {
  24         struct drm_connector connector;
  25         struct drm_encoder encoder;
  26         struct device *dev;
  27         void *edid;
  28         int edid_len;
  29         u32 bus_format;
  30         u32 bus_flags;
  31         struct drm_display_mode mode;
  32         struct drm_panel *panel;
  33         struct drm_bridge *bridge;
  34 };
  35
  36 static inline struct imx_parallel_display *con_to_imxpd(struct drm_connector *c)
  37 {
  38         return container_of(c, struct imx_parallel_display, connector);
  39 }
  40
  41 static inline struct imx_parallel_display *enc_to_imxpd(struct drm_encoder *e)
  42 {
  43         return container_of(e, struct imx_parallel_display, encoder);
  44 }
  45
  46 static int imx_pd_connector_get_modes(struct drm_connector *connector)
  47 {
  48         struct imx_parallel_display *imxpd = con_to_imxpd(connector);
  49         struct device_node *np = imxpd->dev->of_node;
  50         int num_modes = 0;
  51
  52         if (imxpd->panel && imxpd->panel->funcs &&
  53             imxpd->panel->funcs->get_modes) {
  54                 num_modes = imxpd->panel->funcs->get_modes(imxpd->panel);
  55                 if (num_modes > 0)
  56                         return num_modes;
  57         }
  58
  59         if (imxpd->edid) {
  60                 drm_connector_update_edid_property(connector, imxpd->edid);
  61                 num_modes = drm_add_edid_modes(connector, imxpd->edid);
  62         }
  63
  64         if (np) {
  65                 struct drm_display_mode *mode = drm_mode_create(connector->dev);
  66                 int ret;
  67
  68                 if (!mode)
  69                         return -EINVAL;
  70
  71                 ret = of_get_drm_display_mode(np, &imxpd->mode,
  72                                               &imxpd->bus_flags,
  73                                               OF_USE_NATIVE_MODE);
  74                 if (ret)
  75                         return ret;
  76
  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_enable(struct drm_encoder *encoder)
  95 {
  96         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
  97
  98         drm_panel_prepare(imxpd->panel);
  99         drm_panel_enable(imxpd->panel);
 100 }
 101
 102 static void imx_pd_encoder_disable(struct drm_encoder *encoder)
 103 {
 104         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 105
 106         drm_panel_disable(imxpd->panel);
 107         drm_panel_unprepare(imxpd->panel);
 108 }
 109
 110 static int imx_pd_encoder_atomic_check(struct drm_encoder *encoder,
 111                                        struct drm_crtc_state *crtc_state,
 112                                        struct drm_connector_state *conn_state)
 113 {
 114         struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
 115         struct drm_display_info *di = &conn_state->connector->display_info;
 116         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 117
 118         if (!imxpd->bus_format && di->num_bus_formats) {
 119                 imx_crtc_state->bus_flags = di->bus_flags;
 120                 imx_crtc_state->bus_format = di->bus_formats[0];
 121         } else {
 122                 imx_crtc_state->bus_flags = imxpd->bus_flags;
 123                 imx_crtc_state->bus_format = imxpd->bus_format;
 124         }
 125         imx_crtc_state->di_hsync_pin = 2;
 126         imx_crtc_state->di_vsync_pin = 3;
 127
 128         return 0;
 129 }
 130
 131 static const struct drm_connector_funcs imx_pd_connector_funcs = {
 132         .fill_modes = drm_helper_probe_single_connector_modes,
 133         .destroy = imx_drm_connector_destroy,
 134         .reset = drm_atomic_helper_connector_reset,
 135         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 136         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 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         .enable = imx_pd_encoder_enable,
 150         .disable = imx_pd_encoder_disable,
 151         .atomic_check = imx_pd_encoder_atomic_check,
 152 };
 153
 154 static int imx_pd_register(struct drm_device *drm,
 155         struct imx_parallel_display *imxpd)
 156 {
 157         struct drm_encoder *encoder = &imxpd->encoder;
 158         int ret;
 159
 160         ret = imx_drm_encoder_parse_of(drm, encoder, imxpd->dev->of_node);
 161         if (ret)
 162                 return ret;
 163
 164         /* set the connector's dpms to OFF so that
 165          * drm_helper_connector_dpms() won't return
 166          * immediately since the current state is ON
 167          * at this point.
 168          */
 169         imxpd->connector.dpms = DRM_MODE_DPMS_OFF;
 170
 171         drm_encoder_helper_add(encoder, &imx_pd_encoder_helper_funcs);
 172         drm_encoder_init(drm, encoder, &imx_pd_encoder_funcs,
 173                          DRM_MODE_ENCODER_NONE, NULL);
 174
 175         if (!imxpd->bridge) {
 176                 drm_connector_helper_add(&imxpd->connector,
 177                                 &imx_pd_connector_helper_funcs);
 178                 drm_connector_init(drm, &imxpd->connector,
 179                                    &imx_pd_connector_funcs,
 180                                    DRM_MODE_CONNECTOR_DPI);
 181         }
 182
 183         if (imxpd->panel)
 184                 drm_panel_attach(imxpd->panel, &imxpd->connector);
 185
 186         if (imxpd->bridge) {
 187                 ret = drm_bridge_attach(encoder, imxpd->bridge, NULL);
 188                 if (ret < 0) {
 189                         dev_err(imxpd->dev, "failed to attach bridge: %d\n",
 190                                 ret);
 191                         return ret;
 192                 }
 193         } else {
 194                 drm_connector_attach_encoder(&imxpd->connector, encoder);
 195         }
 196
 197         return 0;
 198 }
 199
 200 static int imx_pd_bind(struct device *dev, struct device *master, void *data)
 201 {
 202         struct drm_device *drm = data;
 203         struct device_node *np = dev->of_node;
 204         const u8 *edidp;
 205         struct imx_parallel_display *imxpd;
 206         int ret;
 207         u32 bus_format = 0;
 208         const char *fmt;
 209
 210         imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL);
 211         if (!imxpd)
 212                 return -ENOMEM;
 213
 214         edidp = of_get_property(np, "edid", &imxpd->edid_len);
 215         if (edidp)
 216                 imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);
 217
 218         ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
 219         if (!ret) {
 220                 if (!strcmp(fmt, "rgb24"))
 221                         bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 222                 else if (!strcmp(fmt, "rgb565"))
 223                         bus_format = MEDIA_BUS_FMT_RGB565_1X16;
 224                 else if (!strcmp(fmt, "bgr666"))
 225                         bus_format = MEDIA_BUS_FMT_RGB666_1X18;
 226                 else if (!strcmp(fmt, "lvds666"))
 227                         bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
 228         }
 229         imxpd->bus_format = bus_format;
 230
 231         /* port@1 is the output port */
 232         ret = drm_of_find_panel_or_bridge(np, 1, 0, &imxpd->panel, &imxpd->bridge);
 233         if (ret && ret != -ENODEV)
 234                 return ret;
 235
 236         imxpd->dev = dev;
 237
 238         ret = imx_pd_register(drm, imxpd);
 239         if (ret)
 240                 return ret;
 241
 242         dev_set_drvdata(dev, imxpd);
 243
 244         return 0;
 245 }
 246
 247 static void imx_pd_unbind(struct device *dev, struct device *master,
 248         void *data)
 249 {
 250         struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
 251
 252         if (imxpd->panel)
 253                 drm_panel_detach(imxpd->panel);
 254
 255         kfree(imxpd->edid);
 256 }
 257
 258 static const struct component_ops imx_pd_ops = {
 259         .bind   = imx_pd_bind,
 260         .unbind = imx_pd_unbind,
 261 };
 262
 263 static int imx_pd_probe(struct platform_device *pdev)
 264 {
 265         return component_add(&pdev->dev, &imx_pd_ops);
 266 }
 267
 268 static int imx_pd_remove(struct platform_device *pdev)
 269 {
 270         component_del(&pdev->dev, &imx_pd_ops);
 271
 272         return 0;
 273 }
 274
 275 static const struct of_device_id imx_pd_dt_ids[] = {
 276         { .compatible = "fsl,imx-parallel-display", },
 277         { /* sentinel */ }
 278 };
 279 MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
 280
 281 static struct platform_driver imx_pd_driver = {
 282         .probe          = imx_pd_probe,
 283         .remove         = imx_pd_remove,
 284         .driver         = {
 285                 .of_match_table = imx_pd_dt_ids,
 286                 .name   = "imx-parallel-display",
 287         },
 288 };
 289
 290 module_platform_driver(imx_pd_driver);
 291
 292 MODULE_DESCRIPTION("i.MX parallel display driver");
 293 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 294 MODULE_LICENSE("GPL");
 295 MODULE_ALIAS("platform:imx-parallel-display");