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