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 exynos_drm_display display; 26 struct device *dev; 27 struct device_node *panel_node; 28 29 struct drm_panel *panel; 30 struct drm_connector connector; 31 struct drm_encoder *encoder; 32 33 struct videomode *vm; 34 int dpms_mode; 35 }; 36 37 #define connector_to_dpi(c) container_of(c, struct exynos_dpi, connector) 38 39 static inline struct exynos_dpi *display_to_dpi(struct exynos_drm_display *d) 40 { 41 return container_of(d, struct exynos_dpi, display); 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 struct drm_connector_funcs exynos_dpi_connector_funcs = { 62 .dpms = drm_helper_connector_dpms, 63 .detect = exynos_dpi_detect, 64 .fill_modes = drm_helper_probe_single_connector_modes, 65 .destroy = exynos_dpi_connector_destroy, 66 }; 67 68 static int exynos_dpi_get_modes(struct drm_connector *connector) 69 { 70 struct exynos_dpi *ctx = connector_to_dpi(connector); 71 72 /* fimd timings gets precedence over panel modes */ 73 if (ctx->vm) { 74 struct drm_display_mode *mode; 75 76 mode = drm_mode_create(connector->dev); 77 if (!mode) { 78 DRM_ERROR("failed to create a new display mode\n"); 79 return 0; 80 } 81 drm_display_mode_from_videomode(ctx->vm, mode); 82 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; 83 drm_mode_probed_add(connector, mode); 84 return 1; 85 } 86 87 if (ctx->panel) 88 return ctx->panel->funcs->get_modes(ctx->panel); 89 90 return 0; 91 } 92 93 static struct drm_encoder * 94 exynos_dpi_best_encoder(struct drm_connector *connector) 95 { 96 struct exynos_dpi *ctx = connector_to_dpi(connector); 97 98 return ctx->encoder; 99 } 100 101 static struct drm_connector_helper_funcs exynos_dpi_connector_helper_funcs = { 102 .get_modes = exynos_dpi_get_modes, 103 .best_encoder = exynos_dpi_best_encoder, 104 }; 105 106 static int exynos_dpi_create_connector(struct exynos_drm_display *display, 107 struct drm_encoder *encoder) 108 { 109 struct exynos_dpi *ctx = display_to_dpi(display); 110 struct drm_connector *connector = &ctx->connector; 111 int ret; 112 113 ctx->encoder = encoder; 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_poweron(struct exynos_dpi *ctx) 133 { 134 if (ctx->panel) { 135 drm_panel_prepare(ctx->panel); 136 drm_panel_enable(ctx->panel); 137 } 138 } 139 140 static void exynos_dpi_poweroff(struct exynos_dpi *ctx) 141 { 142 if (ctx->panel) { 143 drm_panel_disable(ctx->panel); 144 drm_panel_unprepare(ctx->panel); 145 } 146 } 147 148 static void exynos_dpi_dpms(struct exynos_drm_display *display, int mode) 149 { 150 struct exynos_dpi *ctx = display_to_dpi(display); 151 152 switch (mode) { 153 case DRM_MODE_DPMS_ON: 154 if (ctx->dpms_mode != DRM_MODE_DPMS_ON) 155 exynos_dpi_poweron(ctx); 156 break; 157 case DRM_MODE_DPMS_STANDBY: 158 case DRM_MODE_DPMS_SUSPEND: 159 case DRM_MODE_DPMS_OFF: 160 if (ctx->dpms_mode == DRM_MODE_DPMS_ON) 161 exynos_dpi_poweroff(ctx); 162 break; 163 default: 164 break; 165 } 166 ctx->dpms_mode = mode; 167 } 168 169 static struct exynos_drm_display_ops exynos_dpi_display_ops = { 170 .create_connector = exynos_dpi_create_connector, 171 .dpms = exynos_dpi_dpms 172 }; 173 174 /* of_* functions will be removed after merge of of_graph patches */ 175 static struct device_node * 176 of_get_child_by_name_reg(struct device_node *parent, const char *name, u32 reg) 177 { 178 struct device_node *np; 179 180 for_each_child_of_node(parent, np) { 181 u32 r; 182 183 if (!np->name || of_node_cmp(np->name, name)) 184 continue; 185 186 if (of_property_read_u32(np, "reg", &r) < 0) 187 r = 0; 188 189 if (reg == r) 190 break; 191 } 192 193 return np; 194 } 195 196 static struct device_node *of_graph_get_port_by_reg(struct device_node *parent, 197 u32 reg) 198 { 199 struct device_node *ports, *port; 200 201 ports = of_get_child_by_name(parent, "ports"); 202 if (ports) 203 parent = ports; 204 205 port = of_get_child_by_name_reg(parent, "port", reg); 206 207 of_node_put(ports); 208 209 return port; 210 } 211 212 static struct device_node * 213 of_graph_get_endpoint_by_reg(struct device_node *port, u32 reg) 214 { 215 return of_get_child_by_name_reg(port, "endpoint", reg); 216 } 217 218 static struct device_node * 219 of_graph_get_remote_port_parent(const struct device_node *node) 220 { 221 struct device_node *np; 222 unsigned int depth; 223 224 np = of_parse_phandle(node, "remote-endpoint", 0); 225 226 /* Walk 3 levels up only if there is 'ports' node. */ 227 for (depth = 3; depth && np; depth--) { 228 np = of_get_next_parent(np); 229 if (depth == 2 && of_node_cmp(np->name, "ports")) 230 break; 231 } 232 return np; 233 } 234 235 enum { 236 FIMD_PORT_IN0, 237 FIMD_PORT_IN1, 238 FIMD_PORT_IN2, 239 FIMD_PORT_RGB, 240 FIMD_PORT_WRB, 241 }; 242 243 static struct device_node *exynos_dpi_of_find_panel_node(struct device *dev) 244 { 245 struct device_node *np, *ep; 246 247 np = of_graph_get_port_by_reg(dev->of_node, FIMD_PORT_RGB); 248 if (!np) 249 return NULL; 250 251 ep = of_graph_get_endpoint_by_reg(np, 0); 252 of_node_put(np); 253 if (!ep) 254 return NULL; 255 256 np = of_graph_get_remote_port_parent(ep); 257 of_node_put(ep); 258 259 return np; 260 } 261 262 static int exynos_dpi_parse_dt(struct exynos_dpi *ctx) 263 { 264 struct device *dev = ctx->dev; 265 struct device_node *dn = dev->of_node; 266 struct device_node *np; 267 268 ctx->panel_node = exynos_dpi_of_find_panel_node(dev); 269 270 np = of_get_child_by_name(dn, "display-timings"); 271 if (np) { 272 struct videomode *vm; 273 int ret; 274 275 of_node_put(np); 276 277 vm = devm_kzalloc(dev, sizeof(*ctx->vm), GFP_KERNEL); 278 if (!vm) 279 return -ENOMEM; 280 281 ret = of_get_videomode(dn, vm, 0); 282 if (ret < 0) { 283 devm_kfree(dev, vm); 284 return ret; 285 } 286 287 ctx->vm = vm; 288 289 return 0; 290 } 291 292 if (!ctx->panel_node) 293 return -EINVAL; 294 295 return 0; 296 } 297 298 struct exynos_drm_display *exynos_dpi_probe(struct device *dev) 299 { 300 struct exynos_dpi *ctx; 301 int ret; 302 303 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL); 304 if (!ctx) 305 return ERR_PTR(-ENOMEM); 306 307 ctx->display.type = EXYNOS_DISPLAY_TYPE_LCD; 308 ctx->display.ops = &exynos_dpi_display_ops; 309 ctx->dev = dev; 310 ctx->dpms_mode = DRM_MODE_DPMS_OFF; 311 312 ret = exynos_drm_component_add(dev, 313 EXYNOS_DEVICE_TYPE_CONNECTOR, 314 ctx->display.type); 315 if (ret) 316 return ERR_PTR(ret); 317 318 ret = exynos_dpi_parse_dt(ctx); 319 if (ret < 0) { 320 devm_kfree(dev, ctx); 321 goto err_del_component; 322 } 323 324 if (ctx->panel_node) { 325 ctx->panel = of_drm_find_panel(ctx->panel_node); 326 if (!ctx->panel) { 327 exynos_drm_component_del(dev, 328 EXYNOS_DEVICE_TYPE_CONNECTOR); 329 return ERR_PTR(-EPROBE_DEFER); 330 } 331 } 332 333 return &ctx->display; 334 335 err_del_component: 336 exynos_drm_component_del(dev, EXYNOS_DEVICE_TYPE_CONNECTOR); 337 338 return NULL; 339 } 340 341 int exynos_dpi_remove(struct exynos_drm_display *display) 342 { 343 struct exynos_dpi *ctx = display_to_dpi(display); 344 345 exynos_dpi_dpms(&ctx->display, DRM_MODE_DPMS_OFF); 346 347 if (ctx->panel) 348 drm_panel_detach(ctx->panel); 349 350 exynos_drm_component_del(ctx->dev, EXYNOS_DEVICE_TYPE_CONNECTOR); 351 352 return 0; 353 } 354