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         .dpms = drm_atomic_helper_connector_dpms,
  63         .detect = exynos_dpi_detect,
  64         .fill_modes = drm_helper_probe_single_connector_modes,
  65         .destroy = exynos_dpi_connector_destroy,
  66         .reset = drm_atomic_helper_connector_reset,
  67         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
  68         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
  69 };
  70
  71 static int exynos_dpi_get_modes(struct drm_connector *connector)
  72 {
  73         struct exynos_dpi *ctx = connector_to_dpi(connector);
  74
  75         /* fimd timings gets precedence over panel modes */
  76         if (ctx->vm) {
  77                 struct drm_display_mode *mode;
  78
  79                 mode = drm_mode_create(connector->dev);
  80                 if (!mode) {
  81                         DRM_ERROR("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 struct drm_encoder *
  97 exynos_dpi_best_encoder(struct drm_connector *connector)
  98 {
  99         struct exynos_dpi *ctx = connector_to_dpi(connector);
 100
 101         return &ctx->encoder;
 102 }
 103
 104 static const struct drm_connector_helper_funcs exynos_dpi_connector_helper_funcs = {
 105         .get_modes = exynos_dpi_get_modes,
 106         .best_encoder = exynos_dpi_best_encoder,
 107 };
 108
 109 static int exynos_dpi_create_connector(struct drm_encoder *encoder)
 110 {
 111         struct exynos_dpi *ctx = encoder_to_dpi(encoder);
 112         struct drm_connector *connector = &ctx->connector;
 113         int ret;
 114
 115         connector->polled = DRM_CONNECTOR_POLL_HPD;
 116
 117         ret = drm_connector_init(encoder->dev, connector,
 118                                  &exynos_dpi_connector_funcs,
 119                                  DRM_MODE_CONNECTOR_VGA);
 120         if (ret) {
 121                 DRM_ERROR("failed to initialize connector with drm\n");
 122                 return ret;
 123         }
 124
 125         drm_connector_helper_add(connector, &exynos_dpi_connector_helper_funcs);
 126         drm_connector_register(connector);
 127         drm_mode_connector_attach_encoder(connector, encoder);
 128
 129         return 0;
 130 }
 131
 132 static void exynos_dpi_mode_set(struct drm_encoder *encoder,
 133                                 struct drm_display_mode *mode,
 134                                 struct drm_display_mode *adjusted_mode)
 135 {
 136 }
 137
 138 static void exynos_dpi_enable(struct drm_encoder *encoder)
 139 {
 140         struct exynos_dpi *ctx = encoder_to_dpi(encoder);
 141
 142         if (ctx->panel) {
 143                 drm_panel_prepare(ctx->panel);
 144                 drm_panel_enable(ctx->panel);
 145         }
 146 }
 147
 148 static void exynos_dpi_disable(struct drm_encoder *encoder)
 149 {
 150         struct exynos_dpi *ctx = encoder_to_dpi(encoder);
 151
 152         if (ctx->panel) {
 153                 drm_panel_disable(ctx->panel);
 154                 drm_panel_unprepare(ctx->panel);
 155         }
 156 }
 157
 158 static const struct drm_encoder_helper_funcs exynos_dpi_encoder_helper_funcs = {
 159         .mode_set = exynos_dpi_mode_set,
 160         .enable = exynos_dpi_enable,
 161         .disable = exynos_dpi_disable,
 162 };
 163
 164 static const struct drm_encoder_funcs exynos_dpi_encoder_funcs = {
 165         .destroy = drm_encoder_cleanup,
 166 };
 167
 168 enum {
 169         FIMD_PORT_IN0,
 170         FIMD_PORT_IN1,
 171         FIMD_PORT_IN2,
 172         FIMD_PORT_RGB,
 173         FIMD_PORT_WRB,
 174 };
 175
 176 static struct device_node *exynos_dpi_of_find_panel_node(struct device *dev)
 177 {
 178         struct device_node *np, *ep;
 179
 180         ep = of_graph_get_endpoint_by_regs(dev->of_node, FIMD_PORT_RGB, 0);
 181         if (!ep)
 182                 return NULL;
 183
 184         np = of_graph_get_remote_port_parent(ep);
 185         of_node_put(ep);
 186
 187         return np;
 188 }
 189
 190 static int exynos_dpi_parse_dt(struct exynos_dpi *ctx)
 191 {
 192         struct device *dev = ctx->dev;
 193         struct device_node *dn = dev->of_node;
 194         struct device_node *np;
 195
 196         ctx->panel_node = exynos_dpi_of_find_panel_node(dev);
 197
 198         np = of_get_child_by_name(dn, "display-timings");
 199         if (np) {
 200                 struct videomode *vm;
 201                 int ret;
 202
 203                 of_node_put(np);
 204
 205                 vm = devm_kzalloc(dev, sizeof(*ctx->vm), GFP_KERNEL);
 206                 if (!vm)
 207                         return -ENOMEM;
 208
 209                 ret = of_get_videomode(dn, vm, 0);
 210                 if (ret < 0) {
 211                         devm_kfree(dev, vm);
 212                         return ret;
 213                 }
 214
 215                 ctx->vm = vm;
 216
 217                 return 0;
 218         }
 219
 220         if (!ctx->panel_node)
 221                 return -EINVAL;
 222
 223         return 0;
 224 }
 225
 226 int exynos_dpi_bind(struct drm_device *dev, struct drm_encoder *encoder)
 227 {
 228         int ret;
 229
 230         ret = exynos_drm_crtc_get_pipe_from_type(dev, EXYNOS_DISPLAY_TYPE_LCD);
 231         if (ret < 0)
 232                 return ret;
 233
 234         encoder->possible_crtcs = 1 << ret;
 235
 236         DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);
 237
 238         drm_encoder_init(dev, encoder, &exynos_dpi_encoder_funcs,
 239                          DRM_MODE_ENCODER_TMDS, NULL);
 240
 241         drm_encoder_helper_add(encoder, &exynos_dpi_encoder_helper_funcs);
 242
 243         ret = exynos_dpi_create_connector(encoder);
 244         if (ret) {
 245                 DRM_ERROR("failed to create connector ret = %d\n", ret);
 246                 drm_encoder_cleanup(encoder);
 247                 return ret;
 248         }
 249
 250         return 0;
 251 }
 252
 253 struct drm_encoder *exynos_dpi_probe(struct device *dev)
 254 {
 255         struct exynos_dpi *ctx;
 256         int ret;
 257
 258         ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
 259         if (!ctx)
 260                 return ERR_PTR(-ENOMEM);
 261
 262         ctx->dev = dev;
 263
 264         ret = exynos_dpi_parse_dt(ctx);
 265         if (ret < 0) {
 266                 devm_kfree(dev, ctx);
 267                 return NULL;
 268         }
 269
 270         if (ctx->panel_node) {
 271                 ctx->panel = of_drm_find_panel(ctx->panel_node);
 272                 if (!ctx->panel)
 273                         return ERR_PTR(-EPROBE_DEFER);
 274         }
 275
 276         return &ctx->encoder;
 277 }
 278
 279 int exynos_dpi_remove(struct drm_encoder *encoder)
 280 {
 281         struct exynos_dpi *ctx = encoder_to_dpi(encoder);
 282
 283         exynos_dpi_disable(&ctx->encoder);
 284
 285         if (ctx->panel)
 286                 drm_panel_detach(ctx->panel);
 287
 288         return 0;
 289 }