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_bridge.h>
  17 #include <drm/drm_fb_helper.h>
  18 #include <drm/drm_of.h>
  19 #include <drm/drm_panel.h>
  20 #include <drm/drm_probe_helper.h>
  21
  22 #include "imx-drm.h"
  23
  24 struct imx_parallel_display {
  25         struct drm_connector connector;
  26         struct drm_encoder encoder;
  27         struct device *dev;
  28         void *edid;
  29         int edid_len;
  30         u32 bus_format;
  31         u32 bus_flags;
  32         struct drm_display_mode mode;
  33         struct drm_panel *panel;
  34         struct drm_bridge *bridge;
  35 };
  36
  37 static inline struct imx_parallel_display *con_to_imxpd(struct drm_connector *c)
  38 {
  39         return container_of(c, struct imx_parallel_display, connector);
  40 }
  41
  42 static inline struct imx_parallel_display *enc_to_imxpd(struct drm_encoder *e)
  43 {
  44         return container_of(e, struct imx_parallel_display, encoder);
  45 }
  46
  47 static int imx_pd_connector_get_modes(struct drm_connector *connector)
  48 {
  49         struct imx_parallel_display *imxpd = con_to_imxpd(connector);
  50         struct device_node *np = imxpd->dev->of_node;
  51         int num_modes;
  52
  53         num_modes = drm_panel_get_modes(imxpd->panel, connector);
  54         if (num_modes > 0)
  55                 return num_modes;
  56
  57         if (imxpd->edid) {
  58                 drm_connector_update_edid_property(connector, imxpd->edid);
  59                 num_modes = drm_add_edid_modes(connector, imxpd->edid);
  60         }
  61
  62         if (np) {
  63                 struct drm_display_mode *mode = drm_mode_create(connector->dev);
  64                 int ret;
  65
  66                 if (!mode)
  67                         return -EINVAL;
  68
  69                 ret = of_get_drm_display_mode(np, &imxpd->mode,
  70                                               &imxpd->bus_flags,
  71                                               OF_USE_NATIVE_MODE);
  72                 if (ret)
  73                         return ret;
  74
  75                 drm_mode_copy(mode, &imxpd->mode);
  76                 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
  77                 drm_mode_probed_add(connector, mode);
  78                 num_modes++;
  79         }
  80
  81         return num_modes;
  82 }
  83
  84 static struct drm_encoder *imx_pd_connector_best_encoder(
  85                 struct drm_connector *connector)
  86 {
  87         struct imx_parallel_display *imxpd = con_to_imxpd(connector);
  88
  89         return &imxpd->encoder;
  90 }
  91
  92 static void imx_pd_encoder_enable(struct drm_encoder *encoder)
  93 {
  94         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
  95
  96         drm_panel_prepare(imxpd->panel);
  97         drm_panel_enable(imxpd->panel);
  98 }
  99
 100 static void imx_pd_encoder_disable(struct drm_encoder *encoder)
 101 {
 102         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 103
 104         drm_panel_disable(imxpd->panel);
 105         drm_panel_unprepare(imxpd->panel);
 106 }
 107
 108 static int imx_pd_encoder_atomic_check(struct drm_encoder *encoder,
 109                                        struct drm_crtc_state *crtc_state,
 110                                        struct drm_connector_state *conn_state)
 111 {
 112         struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
 113         struct drm_display_info *di = &conn_state->connector->display_info;
 114         struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 115
 116         if (!imxpd->bus_format && di->num_bus_formats) {
 117                 imx_crtc_state->bus_flags = di->bus_flags;
 118                 imx_crtc_state->bus_format = di->bus_formats[0];
 119         } else {
 120                 imx_crtc_state->bus_flags = imxpd->bus_flags;
 121                 imx_crtc_state->bus_format = imxpd->bus_format;
 122         }
 123         imx_crtc_state->di_hsync_pin = 2;
 124         imx_crtc_state->di_vsync_pin = 3;
 125
 126         return 0;
 127 }
 128
 129 static const struct drm_connector_funcs imx_pd_connector_funcs = {
 130         .fill_modes = drm_helper_probe_single_connector_modes,
 131         .destroy = imx_drm_connector_destroy,
 132         .reset = drm_atomic_helper_connector_reset,
 133         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 134         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 135 };
 136
 137 static const struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
 138         .get_modes = imx_pd_connector_get_modes,
 139         .best_encoder = imx_pd_connector_best_encoder,
 140 };
 141
 142 static const struct drm_encoder_funcs imx_pd_encoder_funcs = {
 143         .destroy = imx_drm_encoder_destroy,
 144 };
 145
 146 static const struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = {
 147         .enable = imx_pd_encoder_enable,
 148         .disable = imx_pd_encoder_disable,
 149         .atomic_check = imx_pd_encoder_atomic_check,
 150 };
 151
 152 static int imx_pd_register(struct drm_device *drm,
 153         struct imx_parallel_display *imxpd)
 154 {
 155         struct drm_encoder *encoder = &imxpd->encoder;
 156         int ret;
 157
 158         ret = imx_drm_encoder_parse_of(drm, encoder, imxpd->dev->of_node);
 159         if (ret)
 160                 return ret;
 161
 162         /* set the connector's dpms to OFF so that
 163          * drm_helper_connector_dpms() won't return
 164          * immediately since the current state is ON
 165          * at this point.
 166          */
 167         imxpd->connector.dpms = DRM_MODE_DPMS_OFF;
 168
 169         drm_encoder_helper_add(encoder, &imx_pd_encoder_helper_funcs);
 170         drm_encoder_init(drm, encoder, &imx_pd_encoder_funcs,
 171                          DRM_MODE_ENCODER_NONE, NULL);
 172
 173         if (!imxpd->bridge) {
 174                 drm_connector_helper_add(&imxpd->connector,
 175                                 &imx_pd_connector_helper_funcs);
 176                 drm_connector_init(drm, &imxpd->connector,
 177                                    &imx_pd_connector_funcs,
 178                                    DRM_MODE_CONNECTOR_DPI);
 179         }
 180
 181         if (imxpd->panel)
 182                 drm_panel_attach(imxpd->panel, &imxpd->connector);
 183
 184         if (imxpd->bridge) {
 185                 ret = drm_bridge_attach(encoder, imxpd->bridge, NULL);
 186                 if (ret < 0) {
 187                         dev_err(imxpd->dev, "failed to attach bridge: %d\n",
 188                                 ret);
 189                         return ret;
 190                 }
 191         } else {
 192                 drm_connector_attach_encoder(&imxpd->connector, encoder);
 193         }
 194
 195         return 0;
 196 }
 197
 198 static int imx_pd_bind(struct device *dev, struct device *master, void *data)
 199 {
 200         struct drm_device *drm = data;
 201         struct device_node *np = dev->of_node;
 202         const u8 *edidp;
 203         struct imx_parallel_display *imxpd;
 204         int ret;
 205         u32 bus_format = 0;
 206         const char *fmt;
 207
 208         imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL);
 209         if (!imxpd)
 210                 return -ENOMEM;
 211
 212         edidp = of_get_property(np, "edid", &imxpd->edid_len);
 213         if (edidp)
 214                 imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);
 215
 216         ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
 217         if (!ret) {
 218                 if (!strcmp(fmt, "rgb24"))
 219                         bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 220                 else if (!strcmp(fmt, "rgb565"))
 221                         bus_format = MEDIA_BUS_FMT_RGB565_1X16;
 222                 else if (!strcmp(fmt, "bgr666"))
 223                         bus_format = MEDIA_BUS_FMT_RGB666_1X18;
 224                 else if (!strcmp(fmt, "lvds666"))
 225                         bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
 226         }
 227         imxpd->bus_format = bus_format;
 228
 229         /* port@1 is the output port */
 230         ret = drm_of_find_panel_or_bridge(np, 1, 0, &imxpd->panel, &imxpd->bridge);
 231         if (ret && ret != -ENODEV)
 232                 return ret;
 233
 234         imxpd->dev = dev;
 235
 236         ret = imx_pd_register(drm, imxpd);
 237         if (ret)
 238                 return ret;
 239
 240         dev_set_drvdata(dev, imxpd);
 241
 242         return 0;
 243 }
 244
 245 static void imx_pd_unbind(struct device *dev, struct device *master,
 246         void *data)
 247 {
 248         struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
 249
 250         if (imxpd->panel)
 251                 drm_panel_detach(imxpd->panel);
 252
 253         kfree(imxpd->edid);
 254 }
 255
 256 static const struct component_ops imx_pd_ops = {
 257         .bind   = imx_pd_bind,
 258         .unbind = imx_pd_unbind,
 259 };
 260
 261 static int imx_pd_probe(struct platform_device *pdev)
 262 {
 263         return component_add(&pdev->dev, &imx_pd_ops);
 264 }
 265
 266 static int imx_pd_remove(struct platform_device *pdev)
 267 {
 268         component_del(&pdev->dev, &imx_pd_ops);
 269
 270         return 0;
 271 }
 272
 273 static const struct of_device_id imx_pd_dt_ids[] = {
 274         { .compatible = "fsl,imx-parallel-display", },
 275         { /* sentinel */ }
 276 };
 277 MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
 278
 279 static struct platform_driver imx_pd_driver = {
 280         .probe          = imx_pd_probe,
 281         .remove         = imx_pd_remove,
 282         .driver         = {
 283                 .of_match_table = imx_pd_dt_ids,
 284                 .name   = "imx-parallel-display",
 285         },
 286 };
 287
 288 module_platform_driver(imx_pd_driver);
 289
 290 MODULE_DESCRIPTION("i.MX parallel display driver");
 291 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 292 MODULE_LICENSE("GPL");
 293 MODULE_ALIAS("platform:imx-parallel-display");