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
  17 #include <linux/regulator/consumer.h>
  18
  19 #include <video/of_videomode.h>
  20 #include <video/videomode.h>
  21
  22 #include "exynos_drm_drv.h"
  23
  24 struct exynos_dpi {
  25         struct device *dev;
  26         struct device_node *panel_node;
  27
  28         struct drm_panel *panel;
  29         struct drm_connector connector;
  30         struct drm_encoder *encoder;
  31
  32         struct videomode *vm;
  33         int dpms_mode;
  34 };
  35
  36 #define connector_to_dpi(c) container_of(c, struct exynos_dpi, connector)
  37
  38 static enum drm_connector_status
  39 exynos_dpi_detect(struct drm_connector *connector, bool force)
  40 {
  41         struct exynos_dpi *ctx = connector_to_dpi(connector);
  42
  43         if (ctx->panel && !ctx->panel->connector)
  44                 drm_panel_attach(ctx->panel, &ctx->connector);
  45
  46         return connector_status_connected;
  47 }
  48
  49 static void exynos_dpi_connector_destroy(struct drm_connector *connector)
  50 {
  51         drm_connector_unregister(connector);
  52         drm_connector_cleanup(connector);
  53 }
  54
  55 static struct drm_connector_funcs exynos_dpi_connector_funcs = {
  56         .dpms = drm_helper_connector_dpms,
  57         .detect = exynos_dpi_detect,
  58         .fill_modes = drm_helper_probe_single_connector_modes,
  59         .destroy = exynos_dpi_connector_destroy,
  60 };
  61
  62 static int exynos_dpi_get_modes(struct drm_connector *connector)
  63 {
  64         struct exynos_dpi *ctx = connector_to_dpi(connector);
  65
  66         /* fimd timings gets precedence over panel modes */
  67         if (ctx->vm) {
  68                 struct drm_display_mode *mode;
  69
  70                 mode = drm_mode_create(connector->dev);
  71                 if (!mode) {
  72                         DRM_ERROR("failed to create a new display mode\n");
  73                         return 0;
  74                 }
  75                 drm_display_mode_from_videomode(ctx->vm, mode);
  76                 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
  77                 drm_mode_probed_add(connector, mode);
  78                 return 1;
  79         }
  80
  81         if (ctx->panel)
  82                 return ctx->panel->funcs->get_modes(ctx->panel);
  83
  84         return 0;
  85 }
  86
  87 static struct drm_encoder *
  88 exynos_dpi_best_encoder(struct drm_connector *connector)
  89 {
  90         struct exynos_dpi *ctx = connector_to_dpi(connector);
  91
  92         return ctx->encoder;
  93 }
  94
  95 static struct drm_connector_helper_funcs exynos_dpi_connector_helper_funcs = {
  96         .get_modes = exynos_dpi_get_modes,
  97         .best_encoder = exynos_dpi_best_encoder,
  98 };
  99
 100 static int exynos_dpi_create_connector(struct exynos_drm_display *display,
 101                                        struct drm_encoder *encoder)
 102 {
 103         struct exynos_dpi *ctx = display->ctx;
 104         struct drm_connector *connector = &ctx->connector;
 105         int ret;
 106
 107         ctx->encoder = encoder;
 108
 109         connector->polled = DRM_CONNECTOR_POLL_HPD;
 110
 111         ret = drm_connector_init(encoder->dev, connector,
 112                                  &exynos_dpi_connector_funcs,
 113                                  DRM_MODE_CONNECTOR_VGA);
 114         if (ret) {
 115                 DRM_ERROR("failed to initialize connector with drm\n");
 116                 return ret;
 117         }
 118
 119         drm_connector_helper_add(connector, &exynos_dpi_connector_helper_funcs);
 120         drm_connector_register(connector);
 121         drm_mode_connector_attach_encoder(connector, encoder);
 122
 123         return 0;
 124 }
 125
 126 static void exynos_dpi_poweron(struct exynos_dpi *ctx)
 127 {
 128         if (ctx->panel) {
 129                 drm_panel_prepare(ctx->panel);
 130                 drm_panel_enable(ctx->panel);
 131         }
 132 }
 133
 134 static void exynos_dpi_poweroff(struct exynos_dpi *ctx)
 135 {
 136         if (ctx->panel) {
 137                 drm_panel_disable(ctx->panel);
 138                 drm_panel_unprepare(ctx->panel);
 139         }
 140 }
 141
 142 static void exynos_dpi_dpms(struct exynos_drm_display *display, int mode)
 143 {
 144         struct exynos_dpi *ctx = display->ctx;
 145
 146         switch (mode) {
 147         case DRM_MODE_DPMS_ON:
 148                 if (ctx->dpms_mode != DRM_MODE_DPMS_ON)
 149                                 exynos_dpi_poweron(ctx);
 150                         break;
 151         case DRM_MODE_DPMS_STANDBY:
 152         case DRM_MODE_DPMS_SUSPEND:
 153         case DRM_MODE_DPMS_OFF:
 154                 if (ctx->dpms_mode == DRM_MODE_DPMS_ON)
 155                         exynos_dpi_poweroff(ctx);
 156                 break;
 157         default:
 158                 break;
 159         }
 160         ctx->dpms_mode = mode;
 161 }
 162
 163 static struct exynos_drm_display_ops exynos_dpi_display_ops = {
 164         .create_connector = exynos_dpi_create_connector,
 165         .dpms = exynos_dpi_dpms
 166 };
 167
 168 static struct exynos_drm_display exynos_dpi_display = {
 169         .type = EXYNOS_DISPLAY_TYPE_LCD,
 170         .ops = &exynos_dpi_display_ops,
 171 };
 172
 173 /* of_* functions will be removed after merge of of_graph patches */
 174 static struct device_node *
 175 of_get_child_by_name_reg(struct device_node *parent, const char *name, u32 reg)
 176 {
 177         struct device_node *np;
 178
 179         for_each_child_of_node(parent, np) {
 180                 u32 r;
 181
 182                 if (!np->name || of_node_cmp(np->name, name))
 183                         continue;
 184
 185                 if (of_property_read_u32(np, "reg", &r) < 0)
 186                         r = 0;
 187
 188                 if (reg == r)
 189                         break;
 190         }
 191
 192         return np;
 193 }
 194
 195 static struct device_node *of_graph_get_port_by_reg(struct device_node *parent,
 196                                                     u32 reg)
 197 {
 198         struct device_node *ports, *port;
 199
 200         ports = of_get_child_by_name(parent, "ports");
 201         if (ports)
 202                 parent = ports;
 203
 204         port = of_get_child_by_name_reg(parent, "port", reg);
 205
 206         of_node_put(ports);
 207
 208         return port;
 209 }
 210
 211 static struct device_node *
 212 of_graph_get_endpoint_by_reg(struct device_node *port, u32 reg)
 213 {
 214         return of_get_child_by_name_reg(port, "endpoint", reg);
 215 }
 216
 217 static struct device_node *
 218 of_graph_get_remote_port_parent(const struct device_node *node)
 219 {
 220         struct device_node *np;
 221         unsigned int depth;
 222
 223         np = of_parse_phandle(node, "remote-endpoint", 0);
 224
 225         /* Walk 3 levels up only if there is 'ports' node. */
 226         for (depth = 3; depth && np; depth--) {
 227                 np = of_get_next_parent(np);
 228                 if (depth == 2 && of_node_cmp(np->name, "ports"))
 229                         break;
 230         }
 231         return np;
 232 }
 233
 234 enum {
 235         FIMD_PORT_IN0,
 236         FIMD_PORT_IN1,
 237         FIMD_PORT_IN2,
 238         FIMD_PORT_RGB,
 239         FIMD_PORT_WRB,
 240 };
 241
 242 static struct device_node *exynos_dpi_of_find_panel_node(struct device *dev)
 243 {
 244         struct device_node *np, *ep;
 245
 246         np = of_graph_get_port_by_reg(dev->of_node, FIMD_PORT_RGB);
 247         if (!np)
 248                 return NULL;
 249
 250         ep = of_graph_get_endpoint_by_reg(np, 0);
 251         of_node_put(np);
 252         if (!ep)
 253                 return NULL;
 254
 255         np = of_graph_get_remote_port_parent(ep);
 256         of_node_put(ep);
 257
 258         return np;
 259 }
 260
 261 static int exynos_dpi_parse_dt(struct exynos_dpi *ctx)
 262 {
 263         struct device *dev = ctx->dev;
 264         struct device_node *dn = dev->of_node;
 265         struct device_node *np;
 266
 267         ctx->panel_node = exynos_dpi_of_find_panel_node(dev);
 268
 269         np = of_get_child_by_name(dn, "display-timings");
 270         if (np) {
 271                 struct videomode *vm;
 272                 int ret;
 273
 274                 of_node_put(np);
 275
 276                 vm = devm_kzalloc(dev, sizeof(*ctx->vm), GFP_KERNEL);
 277                 if (!vm)
 278                         return -ENOMEM;
 279
 280                 ret = of_get_videomode(dn, vm, 0);
 281                 if (ret < 0) {
 282                         devm_kfree(dev, vm);
 283                         return ret;
 284                 }
 285
 286                 ctx->vm = vm;
 287
 288                 return 0;
 289         }
 290
 291         if (!ctx->panel_node)
 292                 return -EINVAL;
 293
 294         return 0;
 295 }
 296
 297 struct exynos_drm_display *exynos_dpi_probe(struct device *dev)
 298 {
 299         struct exynos_dpi *ctx;
 300         int ret;
 301
 302         ret = exynos_drm_component_add(dev,
 303                                         EXYNOS_DEVICE_TYPE_CONNECTOR,
 304                                         exynos_dpi_display.type);
 305         if (ret)
 306                 return ERR_PTR(ret);
 307
 308         ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
 309         if (!ctx)
 310                 goto err_del_component;
 311
 312         ctx->dev = dev;
 313         exynos_dpi_display.ctx = ctx;
 314         ctx->dpms_mode = DRM_MODE_DPMS_OFF;
 315
 316         ret = exynos_dpi_parse_dt(ctx);
 317         if (ret < 0) {
 318                 devm_kfree(dev, ctx);
 319                 goto err_del_component;
 320         }
 321
 322         if (ctx->panel_node) {
 323                 ctx->panel = of_drm_find_panel(ctx->panel_node);
 324                 if (!ctx->panel) {
 325                         exynos_drm_component_del(dev,
 326                                                 EXYNOS_DEVICE_TYPE_CONNECTOR);
 327                         return ERR_PTR(-EPROBE_DEFER);
 328                 }
 329         }
 330
 331         return &exynos_dpi_display;
 332
 333 err_del_component:
 334         exynos_drm_component_del(dev, EXYNOS_DEVICE_TYPE_CONNECTOR);
 335
 336         return NULL;
 337 }
 338
 339 int exynos_dpi_remove(struct device *dev)
 340 {
 341         struct exynos_dpi *ctx = exynos_dpi_display.ctx;
 342
 343         exynos_dpi_dpms(&exynos_dpi_display, DRM_MODE_DPMS_OFF);
 344
 345         if (ctx->panel)
 346                 drm_panel_detach(ctx->panel);
 347
 348         exynos_drm_component_del(dev, EXYNOS_DEVICE_TYPE_CONNECTOR);
 349
 350         return 0;
 351 }