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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", &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