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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (C) 2016 Texas Instruments4 * Author: Jyri Sarha <jsarha@ti.com>5 */6 7#include <linux/gpio/consumer.h>8#include <linux/i2c.h>9#include <linux/media-bus-format.h>10#include <linux/module.h>11#include <linux/of_graph.h>12#include <linux/platform_device.h>13#include <linux/workqueue.h>14 15#include <drm/drm_atomic_helper.h>16#include <drm/drm_bridge.h>17#include <drm/drm_crtc.h>18#include <drm/drm_edid.h>19#include <drm/drm_print.h>20#include <drm/drm_probe_helper.h>21 22#define HOTPLUG_DEBOUNCE_MS 110023 24struct tfp410 {25 struct drm_bridge bridge;26 struct drm_connector connector;27 28 u32 bus_format;29 struct delayed_work hpd_work;30 struct gpio_desc *powerdown;31 32 struct drm_bridge_timings timings;33 struct drm_bridge *next_bridge;34 35 struct device *dev;36};37 38static inline struct tfp410 *39drm_bridge_to_tfp410(struct drm_bridge *bridge)40{41 return container_of(bridge, struct tfp410, bridge);42}43 44static inline struct tfp410 *45drm_connector_to_tfp410(struct drm_connector *connector)46{47 return container_of(connector, struct tfp410, connector);48}49 50static int tfp410_get_modes(struct drm_connector *connector)51{52 struct tfp410 *dvi = drm_connector_to_tfp410(connector);53 const struct drm_edid *drm_edid;54 int ret;55 56 if (dvi->next_bridge->ops & DRM_BRIDGE_OP_EDID) {57 drm_edid = drm_bridge_edid_read(dvi->next_bridge, connector);58 if (!drm_edid)59 DRM_INFO("EDID read failed. Fallback to standard modes\n");60 } else {61 drm_edid = NULL;62 }63 64 drm_edid_connector_update(connector, drm_edid);65 66 if (!drm_edid) {67 /*68 * No EDID, fallback on the XGA standard modes and prefer a mode69 * pretty much anything can handle.70 */71 ret = drm_add_modes_noedid(connector, 1920, 1200);72 drm_set_preferred_mode(connector, 1024, 768);73 return ret;74 }75 76 ret = drm_edid_connector_add_modes(connector);77 78 drm_edid_free(drm_edid);79 80 return ret;81}82 83static const struct drm_connector_helper_funcs tfp410_con_helper_funcs = {84 .get_modes = tfp410_get_modes,85};86 87static enum drm_connector_status88tfp410_connector_detect(struct drm_connector *connector, bool force)89{90 struct tfp410 *dvi = drm_connector_to_tfp410(connector);91 92 return drm_bridge_detect(dvi->next_bridge);93}94 95static const struct drm_connector_funcs tfp410_con_funcs = {96 .detect = tfp410_connector_detect,97 .fill_modes = drm_helper_probe_single_connector_modes,98 .destroy = drm_connector_cleanup,99 .reset = drm_atomic_helper_connector_reset,100 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,101 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,102};103 104static void tfp410_hpd_work_func(struct work_struct *work)105{106 struct tfp410 *dvi;107 108 dvi = container_of(work, struct tfp410, hpd_work.work);109 110 if (dvi->bridge.dev)111 drm_helper_hpd_irq_event(dvi->bridge.dev);112}113 114static void tfp410_hpd_callback(void *arg, enum drm_connector_status status)115{116 struct tfp410 *dvi = arg;117 118 mod_delayed_work(system_wq, &dvi->hpd_work,119 msecs_to_jiffies(HOTPLUG_DEBOUNCE_MS));120}121 122static int tfp410_attach(struct drm_bridge *bridge,123 enum drm_bridge_attach_flags flags)124{125 struct tfp410 *dvi = drm_bridge_to_tfp410(bridge);126 int ret;127 128 ret = drm_bridge_attach(bridge->encoder, dvi->next_bridge, bridge,129 DRM_BRIDGE_ATTACH_NO_CONNECTOR);130 if (ret < 0)131 return ret;132 133 if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)134 return 0;135 136 if (dvi->next_bridge->ops & DRM_BRIDGE_OP_DETECT)137 dvi->connector.polled = DRM_CONNECTOR_POLL_HPD;138 else139 dvi->connector.polled = DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;140 141 if (dvi->next_bridge->ops & DRM_BRIDGE_OP_HPD) {142 INIT_DELAYED_WORK(&dvi->hpd_work, tfp410_hpd_work_func);143 drm_bridge_hpd_enable(dvi->next_bridge, tfp410_hpd_callback,144 dvi);145 }146 147 drm_connector_helper_add(&dvi->connector,148 &tfp410_con_helper_funcs);149 ret = drm_connector_init_with_ddc(bridge->dev, &dvi->connector,150 &tfp410_con_funcs,151 dvi->next_bridge->type,152 dvi->next_bridge->ddc);153 if (ret) {154 dev_err(dvi->dev, "drm_connector_init_with_ddc() failed: %d\n",155 ret);156 return ret;157 }158 159 drm_display_info_set_bus_formats(&dvi->connector.display_info,160 &dvi->bus_format, 1);161 162 drm_connector_attach_encoder(&dvi->connector, bridge->encoder);163 164 return 0;165}166 167static void tfp410_detach(struct drm_bridge *bridge)168{169 struct tfp410 *dvi = drm_bridge_to_tfp410(bridge);170 171 if (dvi->connector.dev && dvi->next_bridge->ops & DRM_BRIDGE_OP_HPD) {172 drm_bridge_hpd_disable(dvi->next_bridge);173 cancel_delayed_work_sync(&dvi->hpd_work);174 }175}176 177static void tfp410_enable(struct drm_bridge *bridge)178{179 struct tfp410 *dvi = drm_bridge_to_tfp410(bridge);180 181 gpiod_set_value_cansleep(dvi->powerdown, 0);182}183 184static void tfp410_disable(struct drm_bridge *bridge)185{186 struct tfp410 *dvi = drm_bridge_to_tfp410(bridge);187 188 gpiod_set_value_cansleep(dvi->powerdown, 1);189}190 191static enum drm_mode_status tfp410_mode_valid(struct drm_bridge *bridge,192 const struct drm_display_info *info,193 const struct drm_display_mode *mode)194{195 if (mode->clock < 25000)196 return MODE_CLOCK_LOW;197 198 if (mode->clock > 165000)199 return MODE_CLOCK_HIGH;200 201 return MODE_OK;202}203 204static u32 *tfp410_get_input_bus_fmts(struct drm_bridge *bridge,205 struct drm_bridge_state *bridge_state,206 struct drm_crtc_state *crtc_state,207 struct drm_connector_state *conn_state,208 u32 output_fmt,209 unsigned int *num_input_fmts)210{211 struct tfp410 *dvi = drm_bridge_to_tfp410(bridge);212 u32 *input_fmts;213 214 *num_input_fmts = 0;215 216 input_fmts = kzalloc(sizeof(*input_fmts), GFP_KERNEL);217 if (!input_fmts)218 return NULL;219 220 *num_input_fmts = 1;221 input_fmts[0] = dvi->bus_format;222 223 return input_fmts;224}225 226static int tfp410_atomic_check(struct drm_bridge *bridge,227 struct drm_bridge_state *bridge_state,228 struct drm_crtc_state *crtc_state,229 struct drm_connector_state *conn_state)230{231 struct tfp410 *dvi = drm_bridge_to_tfp410(bridge);232 233 /*234 * There might be flags negotiation supported in future.235 * Set the bus flags in atomic_check statically for now.236 */237 bridge_state->input_bus_cfg.flags = dvi->timings.input_bus_flags;238 239 return 0;240}241 242static const struct drm_bridge_funcs tfp410_bridge_funcs = {243 .attach = tfp410_attach,244 .detach = tfp410_detach,245 .enable = tfp410_enable,246 .disable = tfp410_disable,247 .mode_valid = tfp410_mode_valid,248 .atomic_reset = drm_atomic_helper_bridge_reset,249 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,250 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,251 .atomic_get_input_bus_fmts = tfp410_get_input_bus_fmts,252 .atomic_check = tfp410_atomic_check,253};254 255static const struct drm_bridge_timings tfp410_default_timings = {256 .input_bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE257 | DRM_BUS_FLAG_DE_HIGH,258 .setup_time_ps = 1200,259 .hold_time_ps = 1300,260};261 262static int tfp410_parse_timings(struct tfp410 *dvi, bool i2c)263{264 struct drm_bridge_timings *timings = &dvi->timings;265 struct device_node *ep;266 u32 pclk_sample = 0;267 u32 bus_width = 24;268 u32 deskew = 0;269 270 /* Start with defaults. */271 *timings = tfp410_default_timings;272 273 if (i2c)274 /*275 * In I2C mode timings are configured through the I2C interface.276 * As the driver doesn't support I2C configuration yet, we just277 * go with the defaults (BSEL=1, DSEL=1, DKEN=0, EDGE=1).278 */279 return 0;280 281 /*282 * In non-I2C mode, timings are configured through the BSEL, DSEL, DKEN283 * and EDGE pins. They are specified in DT through endpoint properties284 * and vendor-specific properties.285 */286 ep = of_graph_get_endpoint_by_regs(dvi->dev->of_node, 0, 0);287 if (!ep)288 return -EINVAL;289 290 /* Get the sampling edge from the endpoint. */291 of_property_read_u32(ep, "pclk-sample", &pclk_sample);292 of_property_read_u32(ep, "bus-width", &bus_width);293 of_node_put(ep);294 295 timings->input_bus_flags = DRM_BUS_FLAG_DE_HIGH;296 297 switch (pclk_sample) {298 case 0:299 timings->input_bus_flags |= DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE300 | DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE;301 break;302 case 1:303 timings->input_bus_flags |= DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE304 | DRM_BUS_FLAG_SYNC_SAMPLE_POSEDGE;305 break;306 default:307 return -EINVAL;308 }309 310 switch (bus_width) {311 case 12:312 dvi->bus_format = MEDIA_BUS_FMT_RGB888_2X12_LE;313 break;314 case 24:315 dvi->bus_format = MEDIA_BUS_FMT_RGB888_1X24;316 break;317 default:318 return -EINVAL;319 }320 321 /* Get the setup and hold time from vendor-specific properties. */322 of_property_read_u32(dvi->dev->of_node, "ti,deskew", &deskew);323 if (deskew > 7)324 return -EINVAL;325 326 timings->setup_time_ps = 1200 - 350 * ((s32)deskew - 4);327 timings->hold_time_ps = max(0, 1300 + 350 * ((s32)deskew - 4));328 329 return 0;330}331 332static int tfp410_init(struct device *dev, bool i2c)333{334 struct device_node *node;335 struct tfp410 *dvi;336 int ret;337 338 if (!dev->of_node) {339 dev_err(dev, "device-tree data is missing\n");340 return -ENXIO;341 }342 343 dvi = devm_kzalloc(dev, sizeof(*dvi), GFP_KERNEL);344 if (!dvi)345 return -ENOMEM;346 347 dvi->dev = dev;348 dev_set_drvdata(dev, dvi);349 350 dvi->bridge.funcs = &tfp410_bridge_funcs;351 dvi->bridge.of_node = dev->of_node;352 dvi->bridge.timings = &dvi->timings;353 dvi->bridge.type = DRM_MODE_CONNECTOR_DVID;354 355 ret = tfp410_parse_timings(dvi, i2c);356 if (ret)357 return ret;358 359 /* Get the next bridge, connected to port@1. */360 node = of_graph_get_remote_node(dev->of_node, 1, -1);361 if (!node)362 return -ENODEV;363 364 dvi->next_bridge = of_drm_find_bridge(node);365 of_node_put(node);366 367 if (!dvi->next_bridge)368 return -EPROBE_DEFER;369 370 /* Get the powerdown GPIO. */371 dvi->powerdown = devm_gpiod_get_optional(dev, "powerdown",372 GPIOD_OUT_HIGH);373 if (IS_ERR(dvi->powerdown)) {374 dev_err(dev, "failed to parse powerdown gpio\n");375 return PTR_ERR(dvi->powerdown);376 }377 378 /* Register the DRM bridge. */379 drm_bridge_add(&dvi->bridge);380 381 return 0;382}383 384static void tfp410_fini(struct device *dev)385{386 struct tfp410 *dvi = dev_get_drvdata(dev);387 388 drm_bridge_remove(&dvi->bridge);389}390 391static int tfp410_probe(struct platform_device *pdev)392{393 return tfp410_init(&pdev->dev, false);394}395 396static void tfp410_remove(struct platform_device *pdev)397{398 tfp410_fini(&pdev->dev);399}400 401static const struct of_device_id tfp410_match[] = {402 { .compatible = "ti,tfp410" },403 {},404};405MODULE_DEVICE_TABLE(of, tfp410_match);406 407static struct platform_driver tfp410_platform_driver = {408 .probe = tfp410_probe,409 .remove_new = tfp410_remove,410 .driver = {411 .name = "tfp410-bridge",412 .of_match_table = tfp410_match,413 },414};415 416#if IS_ENABLED(CONFIG_I2C)417/* There is currently no i2c functionality. */418static int tfp410_i2c_probe(struct i2c_client *client)419{420 int reg;421 422 if (!client->dev.of_node ||423 of_property_read_u32(client->dev.of_node, "reg", ®)) {424 dev_err(&client->dev,425 "Can't get i2c reg property from device-tree\n");426 return -ENXIO;427 }428 429 return tfp410_init(&client->dev, true);430}431 432static void tfp410_i2c_remove(struct i2c_client *client)433{434 tfp410_fini(&client->dev);435}436 437static const struct i2c_device_id tfp410_i2c_ids[] = {438 { "tfp410", 0 },439 { }440};441MODULE_DEVICE_TABLE(i2c, tfp410_i2c_ids);442 443static struct i2c_driver tfp410_i2c_driver = {444 .driver = {445 .name = "tfp410",446 .of_match_table = tfp410_match,447 },448 .id_table = tfp410_i2c_ids,449 .probe = tfp410_i2c_probe,450 .remove = tfp410_i2c_remove,451};452#endif /* IS_ENABLED(CONFIG_I2C) */453 454static struct {455 uint i2c:1;456 uint platform:1;457} tfp410_registered_driver;458 459static int __init tfp410_module_init(void)460{461 int ret;462 463#if IS_ENABLED(CONFIG_I2C)464 ret = i2c_add_driver(&tfp410_i2c_driver);465 if (ret)466 pr_err("%s: registering i2c driver failed: %d",467 __func__, ret);468 else469 tfp410_registered_driver.i2c = 1;470#endif471 472 ret = platform_driver_register(&tfp410_platform_driver);473 if (ret)474 pr_err("%s: registering platform driver failed: %d",475 __func__, ret);476 else477 tfp410_registered_driver.platform = 1;478 479 if (tfp410_registered_driver.i2c ||480 tfp410_registered_driver.platform)481 return 0;482 483 return ret;484}485module_init(tfp410_module_init);486 487static void __exit tfp410_module_exit(void)488{489#if IS_ENABLED(CONFIG_I2C)490 if (tfp410_registered_driver.i2c)491 i2c_del_driver(&tfp410_i2c_driver);492#endif493 if (tfp410_registered_driver.platform)494 platform_driver_unregister(&tfp410_platform_driver);495}496module_exit(tfp410_module_exit);497 498MODULE_AUTHOR("Jyri Sarha <jsarha@ti.com>");499MODULE_DESCRIPTION("TI TFP410 DVI bridge driver");500MODULE_LICENSE("GPL");501