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 drm_encoder *encoder = exynos_dpi_display.encoder; 342 struct exynos_dpi *ctx = exynos_dpi_display.ctx; 343 344 exynos_dpi_dpms(&exynos_dpi_display, DRM_MODE_DPMS_OFF); 345 encoder->funcs->destroy(encoder); 346 drm_connector_cleanup(&ctx->connector); 347 348 exynos_drm_component_del(dev, EXYNOS_DEVICE_TYPE_CONNECTOR); 349 350 return 0; 351 } 352