drivers/gpu/drm/exynos/exynos_drm_dpi.c

   1 /*
   2  * Exynos DRM Parallel output support.
   3  *
   4  * Copyright (c) 2014 Samsung Electronics Co., Ltd
   5  *
   6  * Contacts: Andrzej Hajda <a.hajda@samsung.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11 */
  12
  13 #include <linux/of_graph.h>
  14 #include <linux/regulator/consumer.h>
  15
  16 #include <drm/drm_atomic_helper.h>
  17 #include <drm/drm_panel.h>
  18 #include <drm/drm_print.h>
  19 #include <drm/drm_probe_helper.h>
  20
  21 #include <video/of_videomode.h>
  22 #include <video/videomode.h>
  23
  24 #include "exynos_drm_crtc.h"
  25
  26 struct exynos_dpi {
  27         struct drm_encoder encoder;
  28         struct device *dev;
  29         struct device_node *panel_node;
  30
  31         struct drm_panel *panel;
  32         struct drm_connector connector;
  33
  34         struct videomode *vm;
  35 };
  36
  37 #define connector_to_dpi(c) container_of(c, struct exynos_dpi, connector)
  38
  39 static inline struct exynos_dpi *encoder_to_dpi(struct drm_encoder *e)
  40 {
  41         return container_of(e, struct exynos_dpi, encoder);
  42 }
  43
  44 static enum drm_connector_status
  45 exynos_dpi_detect(struct drm_connector *connector, bool force)
  46 {
  47         struct exynos_dpi *ctx = connector_to_dpi(connector);
  48
  49         if (ctx->panel && !ctx->panel->connector)
  50                 drm_panel_attach(ctx->panel, &ctx->connector);
  51
  52         return connector_status_connected;
  53 }
  54
  55 static void exynos_dpi_connector_destroy(struct drm_connector *connector)
  56 {
  57         drm_connector_unregister(connector);
  58         drm_connector_cleanup(connector);
  59 }
  60
  61 static const struct drm_connector_funcs exynos_dpi_connector_funcs = {
  62         .detect = exynos_dpi_detect,
  63         .fill_modes = drm_helper_probe_single_connector_modes,
  64         .destroy = exynos_dpi_connector_destroy,
  65         .reset = drm_atomic_helper_connector_reset,
  66         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
  67         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
  68 };
  69
  70 static int exynos_dpi_get_modes(struct drm_connector *connector)
  71 {
  72         struct exynos_dpi *ctx = connector_to_dpi(connector);
  73
  74         /* fimd timings gets precedence over panel modes */
  75         if (ctx->vm) {
  76                 struct drm_display_mode *mode;
  77
  78                 mode = drm_mode_create(connector->dev);
  79                 if (!mode) {
  80                         DRM_DEV_ERROR(ctx->dev,
  81                                       "failed to create a new display mode\n");
  82                         return 0;
  83                 }
  84                 drm_display_mode_from_videomode(ctx->vm, mode);
  85                 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
  86                 drm_mode_probed_add(connector, mode);
  87                 return 1;
  88         }
  89
  90         if (ctx->panel)
  91                 return ctx->panel->funcs->get_modes(ctx->panel);
  92
  93         return 0;
  94 }
  95
  96 static const struct drm_connector_helper_funcs exynos_dpi_connector_helper_funcs = {
  97         .get_modes = exynos_dpi_get_modes,
  98 };
  99
 100 static int exynos_dpi_create_connector(struct drm_encoder *encoder)
 101 {
 102         struct exynos_dpi *ctx = encoder_to_dpi(encoder);
 103         struct drm_connector *connector = &ctx->connector;
 104         int ret;
 105
 106         connector->polled = DRM_CONNECTOR_POLL_HPD;
 107
 108         ret = drm_connector_init(encoder->dev, connector,
 109                                  &exynos_dpi_connector_funcs,
 110                                  DRM_MODE_CONNECTOR_VGA);
 111         if (ret) {
 112                 DRM_DEV_ERROR(ctx->dev,
 113                               "failed to initialize connector with drm\n");
 114                 return ret;
 115         }
 116
 117         drm_connector_helper_add(connector, &exynos_dpi_connector_helper_funcs);
 118         drm_connector_attach_encoder(connector, encoder);
 119
 120         return 0;
 121 }
 122
 123 static void exynos_dpi_mode_set(struct drm_encoder *encoder,
 124                                 struct drm_display_mode *mode,
 125                                 struct drm_display_mode *adjusted_mode)
 126 {
 127 }
 128
 129 static void exynos_dpi_enable(struct drm_encoder *encoder)
 130 {
 131         struct exynos_dpi *ctx = encoder_to_dpi(encoder);
 132
 133         if (ctx->panel) {
 134                 drm_panel_prepare(ctx->panel);
 135                 drm_panel_enable(ctx->panel);
 136         }
 137 }
 138
 139 static void exynos_dpi_disable(struct drm_encoder *encoder)
 140 {
 141         struct exynos_dpi *ctx = encoder_to_dpi(encoder);
 142
 143         if (ctx->panel) {
 144                 drm_panel_disable(ctx->panel);
 145                 drm_panel_unprepare(ctx->panel);
 146         }
 147 }
 148
 149 static const struct drm_encoder_helper_funcs exynos_dpi_encoder_helper_funcs = {
 150         .mode_set = exynos_dpi_mode_set,
 151         .enable = exynos_dpi_enable,
 152         .disable = exynos_dpi_disable,
 153 };
 154
 155 static const struct drm_encoder_funcs exynos_dpi_encoder_funcs = {
 156         .destroy = drm_encoder_cleanup,
 157 };
 158
 159 enum {
 160         FIMD_PORT_IN0,
 161         FIMD_PORT_IN1,
 162         FIMD_PORT_IN2,
 163         FIMD_PORT_RGB,
 164         FIMD_PORT_WRB,
 165 };
 166
 167 static int exynos_dpi_parse_dt(struct exynos_dpi *ctx)
 168 {
 169         struct device *dev = ctx->dev;
 170         struct device_node *dn = dev->of_node;
 171         struct device_node *np;
 172
 173         ctx->panel_node = of_graph_get_remote_node(dn, FIMD_PORT_RGB, 0);
 174
 175         np = of_get_child_by_name(dn, "display-timings");
 176         if (np) {
 177                 struct videomode *vm;
 178                 int ret;
 179
 180                 of_node_put(np);
 181
 182                 vm = devm_kzalloc(dev, sizeof(*ctx->vm), GFP_KERNEL);
 183                 if (!vm)
 184                         return -ENOMEM;
 185
 186                 ret = of_get_videomode(dn, vm, 0);
 187                 if (ret < 0) {
 188                         devm_kfree(dev, vm);
 189                         return ret;
 190                 }
 191
 192                 ctx->vm = vm;
 193
 194                 return 0;
 195         }
 196
 197         if (!ctx->panel_node)
 198                 return -EINVAL;
 199
 200         return 0;
 201 }
 202
 203 int exynos_dpi_bind(struct drm_device *dev, struct drm_encoder *encoder)
 204 {
 205         int ret;
 206
 207         drm_encoder_init(dev, encoder, &exynos_dpi_encoder_funcs,
 208                          DRM_MODE_ENCODER_TMDS, NULL);
 209
 210         drm_encoder_helper_add(encoder, &exynos_dpi_encoder_helper_funcs);
 211
 212         ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD);
 213         if (ret < 0)
 214                 return ret;
 215
 216         ret = exynos_dpi_create_connector(encoder);
 217         if (ret) {
 218                 DRM_DEV_ERROR(encoder_to_dpi(encoder)->dev,
 219                               "failed to create connector ret = %d\n", ret);
 220                 drm_encoder_cleanup(encoder);
 221                 return ret;
 222         }
 223
 224         return 0;
 225 }
 226
 227 struct drm_encoder *exynos_dpi_probe(struct device *dev)
 228 {
 229         struct exynos_dpi *ctx;
 230         int ret;
 231
 232         ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
 233         if (!ctx)
 234                 return ERR_PTR(-ENOMEM);
 235
 236         ctx->dev = dev;
 237
 238         ret = exynos_dpi_parse_dt(ctx);
 239         if (ret < 0) {
 240                 devm_kfree(dev, ctx);
 241                 return NULL;
 242         }
 243
 244         if (ctx->panel_node) {
 245                 ctx->panel = of_drm_find_panel(ctx->panel_node);
 246                 if (IS_ERR(ctx->panel))
 247                         return ERR_CAST(ctx->panel);
 248         }
 249
 250         return &ctx->encoder;
 251 }
 252
 253 int exynos_dpi_remove(struct drm_encoder *encoder)
 254 {
 255         struct exynos_dpi *ctx = encoder_to_dpi(encoder);
 256
 257         exynos_dpi_disable(&ctx->encoder);
 258
 259         if (ctx->panel)
 260                 drm_panel_detach(ctx->panel);
 261
 262         return 0;
 263 }