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 <drm/drmP.h>
  14 #include <drm/drm_crtc_helper.h>
  15 #include <drm/drm_panel.h>
  16 #include <drm/drm_atomic_helper.h>
  17
  18 #include <linux/of_graph.h>
  19 #include <linux/regulator/consumer.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_ERROR("failed to create a new display mode\n");
  81                         return 0;
  82                 }
  83                 drm_display_mode_from_videomode(ctx->vm, mode);
  84                 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
  85                 drm_mode_probed_add(connector, mode);
  86                 return 1;
  87         }
  88
  89         if (ctx->panel)
  90                 return ctx->panel->funcs->get_modes(ctx->panel);
  91
  92         return 0;
  93 }
  94
  95 static const struct drm_connector_helper_funcs exynos_dpi_connector_helper_funcs = {
  96         .get_modes = exynos_dpi_get_modes,
  97 };
  98
  99 static int exynos_dpi_create_connector(struct drm_encoder *encoder)
 100 {
 101         struct exynos_dpi *ctx = encoder_to_dpi(encoder);
 102         struct drm_connector *connector = &ctx->connector;
 103         int ret;
 104
 105         connector->polled = DRM_CONNECTOR_POLL_HPD;
 106
 107         ret = drm_connector_init(encoder->dev, connector,
 108                                  &exynos_dpi_connector_funcs,
 109                                  DRM_MODE_CONNECTOR_VGA);
 110         if (ret) {
 111                 DRM_ERROR("failed to initialize connector with drm\n");
 112                 return ret;
 113         }
 114
 115         drm_connector_helper_add(connector, &exynos_dpi_connector_helper_funcs);
 116         drm_mode_connector_attach_encoder(connector, encoder);
 117
 118         return 0;
 119 }
 120
 121 static void exynos_dpi_mode_set(struct drm_encoder *encoder,
 122                                 struct drm_display_mode *mode,
 123                                 struct drm_display_mode *adjusted_mode)
 124 {
 125 }
 126
 127 static void exynos_dpi_enable(struct drm_encoder *encoder)
 128 {
 129         struct exynos_dpi *ctx = encoder_to_dpi(encoder);
 130
 131         if (ctx->panel) {
 132                 drm_panel_prepare(ctx->panel);
 133                 drm_panel_enable(ctx->panel);
 134         }
 135 }
 136
 137 static void exynos_dpi_disable(struct drm_encoder *encoder)
 138 {
 139         struct exynos_dpi *ctx = encoder_to_dpi(encoder);
 140
 141         if (ctx->panel) {
 142                 drm_panel_disable(ctx->panel);
 143                 drm_panel_unprepare(ctx->panel);
 144         }
 145 }
 146
 147 static const struct drm_encoder_helper_funcs exynos_dpi_encoder_helper_funcs = {
 148         .mode_set = exynos_dpi_mode_set,
 149         .enable = exynos_dpi_enable,
 150         .disable = exynos_dpi_disable,
 151 };
 152
 153 static const struct drm_encoder_funcs exynos_dpi_encoder_funcs = {
 154         .destroy = drm_encoder_cleanup,
 155 };
 156
 157 enum {
 158         FIMD_PORT_IN0,
 159         FIMD_PORT_IN1,
 160         FIMD_PORT_IN2,
 161         FIMD_PORT_RGB,
 162         FIMD_PORT_WRB,
 163 };
 164
 165 static int exynos_dpi_parse_dt(struct exynos_dpi *ctx)
 166 {
 167         struct device *dev = ctx->dev;
 168         struct device_node *dn = dev->of_node;
 169         struct device_node *np;
 170
 171         ctx->panel_node = of_graph_get_remote_node(dn, FIMD_PORT_RGB, 0);
 172
 173         np = of_get_child_by_name(dn, "display-timings");
 174         if (np) {
 175                 struct videomode *vm;
 176                 int ret;
 177
 178                 of_node_put(np);
 179
 180                 vm = devm_kzalloc(dev, sizeof(*ctx->vm), GFP_KERNEL);
 181                 if (!vm)
 182                         return -ENOMEM;
 183
 184                 ret = of_get_videomode(dn, vm, 0);
 185                 if (ret < 0) {
 186                         devm_kfree(dev, vm);
 187                         return ret;
 188                 }
 189
 190                 ctx->vm = vm;
 191
 192                 return 0;
 193         }
 194
 195         if (!ctx->panel_node)
 196                 return -EINVAL;
 197
 198         return 0;
 199 }
 200
 201 int exynos_dpi_bind(struct drm_device *dev, struct drm_encoder *encoder)
 202 {
 203         int ret;
 204
 205         ret = exynos_drm_crtc_get_pipe_from_type(dev, EXYNOS_DISPLAY_TYPE_LCD);
 206         if (ret < 0)
 207                 return ret;
 208
 209         encoder->possible_crtcs = 1 << ret;
 210
 211         DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);
 212
 213         drm_encoder_init(dev, encoder, &exynos_dpi_encoder_funcs,
 214                          DRM_MODE_ENCODER_TMDS, NULL);
 215
 216         drm_encoder_helper_add(encoder, &exynos_dpi_encoder_helper_funcs);
 217
 218         ret = exynos_dpi_create_connector(encoder);
 219         if (ret) {
 220                 DRM_ERROR("failed to create connector ret = %d\n", ret);
 221                 drm_encoder_cleanup(encoder);
 222                 return ret;
 223         }
 224
 225         return 0;
 226 }
 227
 228 struct drm_encoder *exynos_dpi_probe(struct device *dev)
 229 {
 230         struct exynos_dpi *ctx;
 231         int ret;
 232
 233         ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
 234         if (!ctx)
 235                 return ERR_PTR(-ENOMEM);
 236
 237         ctx->dev = dev;
 238
 239         ret = exynos_dpi_parse_dt(ctx);
 240         if (ret < 0) {
 241                 devm_kfree(dev, ctx);
 242                 return NULL;
 243         }
 244
 245         if (ctx->panel_node) {
 246                 ctx->panel = of_drm_find_panel(ctx->panel_node);
 247                 if (!ctx->panel)
 248                         return ERR_PTR(-EPROBE_DEFER);
 249         }
 250
 251         return &ctx->encoder;
 252 }
 253
 254 int exynos_dpi_remove(struct drm_encoder *encoder)
 255 {
 256         struct exynos_dpi *ctx = encoder_to_dpi(encoder);
 257
 258         exynos_dpi_disable(&ctx->encoder);
 259
 260         if (ctx->panel)
 261                 drm_panel_detach(ctx->panel);
 262
 263         return 0;
 264 }