[deliverable/linux.git] / drivers / gpu / drm / tegra / output.c

/*
 * Copyright (C) 2012 Avionic Design GmbH
 * Copyright (C) 2012 NVIDIA CORPORATION.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/of_gpio.h>

#include <drm/drm_panel.h>
#include "drm.h"

static int tegra_connector_get_modes(struct drm_connector *connector)
{
	struct tegra_output *output = connector_to_output(connector);
	struct edid *edid = NULL;
	int err = 0;

	/*
	 * If the panel provides one or more modes, use them exclusively and
	 * ignore any other means of obtaining a mode.
	 */
	if (output->panel) {
		err = output->panel->funcs->get_modes(output->panel);
		if (err > 0)
			return err;
	}

	if (output->edid)
		edid = kmemdup(output->edid, sizeof(*edid), GFP_KERNEL);
	else if (output->ddc)
		edid = drm_get_edid(connector, output->ddc);

	drm_mode_connector_update_edid_property(connector, edid);

	if (edid) {
		err = drm_add_edid_modes(connector, edid);
		kfree(edid);
	}

	return err;
}

static int tegra_connector_mode_valid(struct drm_connector *connector,
				      struct drm_display_mode *mode)
{
	struct tegra_output *output = connector_to_output(connector);
	enum drm_mode_status status = MODE_OK;
	int err;

	err = tegra_output_check_mode(output, mode, &status);
	if (err < 0)
		return MODE_ERROR;

	return status;
}

static struct drm_encoder *
tegra_connector_best_encoder(struct drm_connector *connector)
{
	struct tegra_output *output = connector_to_output(connector);

	return &output->encoder;
}

static const struct drm_connector_helper_funcs connector_helper_funcs = {
	.get_modes = tegra_connector_get_modes,
	.mode_valid = tegra_connector_mode_valid,
	.best_encoder = tegra_connector_best_encoder,
};

static enum drm_connector_status
tegra_connector_detect(struct drm_connector *connector, bool force)
{
	struct tegra_output *output = connector_to_output(connector);
	enum drm_connector_status status = connector_status_unknown;

	if (output->ops->detect)
		return output->ops->detect(output);

	if (gpio_is_valid(output->hpd_gpio)) {
		if (gpio_get_value(output->hpd_gpio) == 0)
			status = connector_status_disconnected;
		else
			status = connector_status_connected;
	} else {
		if (!output->panel)
			status = connector_status_disconnected;
		else
			status = connector_status_connected;

		if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS)
			status = connector_status_connected;
	}

	return status;
}

static void tegra_connector_destroy(struct drm_connector *connector)
{
	drm_connector_unregister(connector);
	drm_connector_cleanup(connector);
}

static const struct drm_connector_funcs connector_funcs = {
	.dpms = drm_helper_connector_dpms,
	.detect = tegra_connector_detect,
	.fill_modes = drm_helper_probe_single_connector_modes,
	.destroy = tegra_connector_destroy,
};

static void tegra_encoder_destroy(struct drm_encoder *encoder)
{
	drm_encoder_cleanup(encoder);
}

static const struct drm_encoder_funcs encoder_funcs = {
	.destroy = tegra_encoder_destroy,
};

static void tegra_encoder_dpms(struct drm_encoder *encoder, int mode)
{
	struct tegra_output *output = encoder_to_output(encoder);
	struct drm_panel *panel = output->panel;

	if (mode != DRM_MODE_DPMS_ON) {
		drm_panel_disable(panel);
		tegra_output_disable(output);
		drm_panel_unprepare(panel);
	} else {
		drm_panel_prepare(panel);
		tegra_output_enable(output);
		drm_panel_enable(panel);
	}
}

static bool tegra_encoder_mode_fixup(struct drm_encoder *encoder,
				     const struct drm_display_mode *mode,
				     struct drm_display_mode *adjusted)
{
	return true;
}

static void tegra_encoder_prepare(struct drm_encoder *encoder)
{
	tegra_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
}

static void tegra_encoder_commit(struct drm_encoder *encoder)
{
	tegra_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
}

static void tegra_encoder_mode_set(struct drm_encoder *encoder,
				   struct drm_display_mode *mode,
				   struct drm_display_mode *adjusted)
{
}

static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
	.dpms = tegra_encoder_dpms,
	.mode_fixup = tegra_encoder_mode_fixup,
	.prepare = tegra_encoder_prepare,
	.commit = tegra_encoder_commit,
	.mode_set = tegra_encoder_mode_set,
};

static irqreturn_t hpd_irq(int irq, void *data)
{
	struct tegra_output *output = data;

	if (output->connector.dev)
		drm_helper_hpd_irq_event(output->connector.dev);

	return IRQ_HANDLED;
}

int tegra_output_probe(struct tegra_output *output)
{
	struct device_node *ddc, *panel;
	enum of_gpio_flags flags;
	int err, size;

	if (!output->of_node)
		output->of_node = output->dev->of_node;

	panel = of_parse_phandle(output->of_node, "nvidia,panel", 0);
	if (panel) {
		output->panel = of_drm_find_panel(panel);
		if (!output->panel)
			return -EPROBE_DEFER;

		of_node_put(panel);
	}

	output->edid = of_get_property(output->of_node, "nvidia,edid", &size);

	ddc = of_parse_phandle(output->of_node, "nvidia,ddc-i2c-bus", 0);
	if (ddc) {
		output->ddc = of_find_i2c_adapter_by_node(ddc);
		if (!output->ddc) {
			err = -EPROBE_DEFER;
			of_node_put(ddc);
			return err;
		}

		of_node_put(ddc);
	}

	output->hpd_gpio = of_get_named_gpio_flags(output->of_node,
						   "nvidia,hpd-gpio", 0,
						   &flags);
	if (gpio_is_valid(output->hpd_gpio)) {
		unsigned long flags;

		err = gpio_request_one(output->hpd_gpio, GPIOF_DIR_IN,
				       "HDMI hotplug detect");
		if (err < 0) {
			dev_err(output->dev, "gpio_request_one(): %d\n", err);
			return err;
		}

		err = gpio_to_irq(output->hpd_gpio);
		if (err < 0) {
			dev_err(output->dev, "gpio_to_irq(): %d\n", err);
			gpio_free(output->hpd_gpio);
			return err;
		}

		output->hpd_irq = err;

		flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
			IRQF_ONESHOT;

		err = request_threaded_irq(output->hpd_irq, NULL, hpd_irq,
					   flags, "hpd", output);
		if (err < 0) {
			dev_err(output->dev, "failed to request IRQ#%u: %d\n",
				output->hpd_irq, err);
			gpio_free(output->hpd_gpio);
			return err;
		}

		output->connector.polled = DRM_CONNECTOR_POLL_HPD;

		/*
		 * Disable the interrupt until the connector has been
		 * initialized to avoid a race in the hotplug interrupt
		 * handler.
		 */
		disable_irq(output->hpd_irq);
	}

	return 0;
}

int tegra_output_remove(struct tegra_output *output)
{
	if (gpio_is_valid(output->hpd_gpio)) {
		free_irq(output->hpd_irq, output);
		gpio_free(output->hpd_gpio);
	}

	if (output->ddc)
		put_device(&output->ddc->dev);

	return 0;
}

int tegra_output_init(struct drm_device *drm, struct tegra_output *output)
{
	int connector, encoder;

	switch (output->type) {
	case TEGRA_OUTPUT_RGB:
		connector = DRM_MODE_CONNECTOR_LVDS;
		encoder = DRM_MODE_ENCODER_LVDS;
		break;

	case TEGRA_OUTPUT_HDMI:
		connector = DRM_MODE_CONNECTOR_HDMIA;
		encoder = DRM_MODE_ENCODER_TMDS;
		break;

	case TEGRA_OUTPUT_DSI:
		connector = DRM_MODE_CONNECTOR_DSI;
		encoder = DRM_MODE_ENCODER_DSI;
		break;

	case TEGRA_OUTPUT_EDP:
		connector = DRM_MODE_CONNECTOR_eDP;
		encoder = DRM_MODE_ENCODER_TMDS;
		break;

	default:
		connector = DRM_MODE_CONNECTOR_Unknown;
		encoder = DRM_MODE_ENCODER_NONE;
		break;
	}

	drm_connector_init(drm, &output->connector, &connector_funcs,
			   connector);
	drm_connector_helper_add(&output->connector, &connector_helper_funcs);
	output->connector.dpms = DRM_MODE_DPMS_OFF;

	if (output->panel)
		drm_panel_attach(output->panel, &output->connector);

	drm_encoder_init(drm, &output->encoder, &encoder_funcs, encoder);
	drm_encoder_helper_add(&output->encoder, &encoder_helper_funcs);

	drm_mode_connector_attach_encoder(&output->connector, &output->encoder);
	drm_connector_register(&output->connector);

	output->encoder.possible_crtcs = 0x3;

	/*
	 * The connector is now registered and ready to receive hotplug events
	 * so the hotplug interrupt can be enabled.
	 */
	if (gpio_is_valid(output->hpd_gpio))
		enable_irq(output->hpd_irq);

	return 0;
}

int tegra_output_exit(struct tegra_output *output)
{
	/*
	 * The connector is going away, so the interrupt must be disabled to
	 * prevent the hotplug interrupt handler from potentially crashing.
	 */
	if (gpio_is_valid(output->hpd_gpio))
		disable_irq(output->hpd_irq);

	if (output->panel)
		drm_panel_detach(output->panel);

	return 0;
}
Commit	Line	Data
d8f4a9ed TR	1	/*
	2	* Copyright (C) 2012 Avionic Design GmbH
	3	* Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License version 2 as
	7	* published by the Free Software Foundation.
	8	*/
	9
d8f4a9ed	10	#include <linux/of_gpio.h>
d8f4a9ed	11
9be7d864	12	#include <drm/drm_panel.h>
d8f4a9ed TR	13	#include "drm.h"
	14
	15	static int tegra_connector_get_modes(struct drm_connector *connector)
	16	{
	17	struct tegra_output *output = connector_to_output(connector);
	18	struct edid *edid = NULL;
	19	int err = 0;
	20
acde5413 TR	21	/*
	22	* If the panel provides one or more modes, use them exclusively and
	23	* ignore any other means of obtaining a mode.
	24	*/
9be7d864 TR	25	if (output->panel) {
	26	err = output->panel->funcs->get_modes(output->panel);
	27	if (err > 0)
	28	return err;
	29	}
	30
d8f4a9ed TR	31	if (output->edid)
	32	edid = kmemdup(output->edid, sizeof(*edid), GFP_KERNEL);
	33	else if (output->ddc)
	34	edid = drm_get_edid(connector, output->ddc);
	35
	36	drm_mode_connector_update_edid_property(connector, edid);
	37
	38	if (edid) {
	39	err = drm_add_edid_modes(connector, edid);
	40	kfree(edid);
	41	}
	42
	43	return err;
	44	}
	45
	46	static int tegra_connector_mode_valid(struct drm_connector *connector,
	47	struct drm_display_mode *mode)
	48	{
	49	struct tegra_output *output = connector_to_output(connector);
	50	enum drm_mode_status status = MODE_OK;
	51	int err;
	52
	53	err = tegra_output_check_mode(output, mode, &status);
	54	if (err < 0)
	55	return MODE_ERROR;
	56
	57	return status;
	58	}
	59
	60	static struct drm_encoder *
	61	tegra_connector_best_encoder(struct drm_connector *connector)
	62	{
	63	struct tegra_output *output = connector_to_output(connector);
	64
	65	return &output->encoder;
	66	}
	67
	68	static const struct drm_connector_helper_funcs connector_helper_funcs = {
	69	.get_modes = tegra_connector_get_modes,
	70	.mode_valid = tegra_connector_mode_valid,
	71	.best_encoder = tegra_connector_best_encoder,
	72	};
	73
	74	static enum drm_connector_status
	75	tegra_connector_detect(struct drm_connector *connector, bool force)
	76	{
	77	struct tegra_output *output = connector_to_output(connector);
	78	enum drm_connector_status status = connector_status_unknown;
	79
6b6b6042 TR	80	if (output->ops->detect)
	81	return output->ops->detect(output);
	82
d8f4a9ed TR	83	if (gpio_is_valid(output->hpd_gpio)) {
	84	if (gpio_get_value(output->hpd_gpio) == 0)
	85	status = connector_status_disconnected;
	86	else
	87	status = connector_status_connected;
	88	} else {
9be7d864 TR	89	if (!output->panel)
	90	status = connector_status_disconnected;
	91	else
	92	status = connector_status_connected;
	93
d8f4a9ed TR	94	if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS)
	95	status = connector_status_connected;
	96	}
	97
	98	return status;
	99	}
	100
	101	static void tegra_connector_destroy(struct drm_connector *connector)
	102	{
34ea3d38	103	drm_connector_unregister(connector);
d8f4a9ed TR	104	drm_connector_cleanup(connector);
	105	}
	106
	107	static const struct drm_connector_funcs connector_funcs = {
	108	.dpms = drm_helper_connector_dpms,
	109	.detect = tegra_connector_detect,
	110	.fill_modes = drm_helper_probe_single_connector_modes,
	111	.destroy = tegra_connector_destroy,
	112	};
	113
	114	static void tegra_encoder_destroy(struct drm_encoder *encoder)
	115	{
	116	drm_encoder_cleanup(encoder);
	117	}
	118
	119	static const struct drm_encoder_funcs encoder_funcs = {
	120	.destroy = tegra_encoder_destroy,
	121	};
	122
	123	static void tegra_encoder_dpms(struct drm_encoder *encoder, int mode)
	124	{
9be7d864 TR	125	struct tegra_output *output = encoder_to_output(encoder);
	126	struct drm_panel *panel = output->panel;
	127
b5190022 TR	128	if (mode != DRM_MODE_DPMS_ON) {
	129	drm_panel_disable(panel);
	130	tegra_output_disable(output);
0407ed8a	131	drm_panel_unprepare(panel);
b5190022	132	} else {
0407ed8a	133	drm_panel_prepare(panel);
b5190022 TR	134	tegra_output_enable(output);
b5190022 TR	135	drm_panel_enable(panel);
9be7d864	136	}
d8f4a9ed TR	137	}
	138
	139	static bool tegra_encoder_mode_fixup(struct drm_encoder *encoder,
	140	const struct drm_display_mode *mode,
	141	struct drm_display_mode *adjusted)
	142	{
	143	return true;
	144	}
	145
	146	static void tegra_encoder_prepare(struct drm_encoder *encoder)
	147	{
0bfad396	148	tegra_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
d8f4a9ed TR	149	}
	150
	151	static void tegra_encoder_commit(struct drm_encoder *encoder)
	152	{
0bfad396	153	tegra_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
d8f4a9ed TR	154	}
	155
	156	static void tegra_encoder_mode_set(struct drm_encoder *encoder,
	157	struct drm_display_mode *mode,
	158	struct drm_display_mode *adjusted)
	159	{
d8f4a9ed TR	160	}
	161
	162	static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
	163	.dpms = tegra_encoder_dpms,
	164	.mode_fixup = tegra_encoder_mode_fixup,
	165	.prepare = tegra_encoder_prepare,
	166	.commit = tegra_encoder_commit,
	167	.mode_set = tegra_encoder_mode_set,
	168	};
	169
	170	static irqreturn_t hpd_irq(int irq, void *data)
	171	{
	172	struct tegra_output *output = data;
	173
8fc8f7da TR	174	if (output->connector.dev)
8fc8f7da TR	175	drm_helper_hpd_irq_event(output->connector.dev);
d8f4a9ed TR	176
	177	return IRQ_HANDLED;
	178	}
	179
59d29c0e	180	int tegra_output_probe(struct tegra_output *output)
d8f4a9ed	181	{
9be7d864	182	struct device_node ddc, panel;
d8f4a9ed	183	enum of_gpio_flags flags;
7236aa03	184	int err, size;
d8f4a9ed TR	185
	186	if (!output->of_node)
	187	output->of_node = output->dev->of_node;
	188
9be7d864 TR	189	panel = of_parse_phandle(output->of_node, "nvidia,panel", 0);
	190	if (panel) {
	191	output->panel = of_drm_find_panel(panel);
	192	if (!output->panel)
	193	return -EPROBE_DEFER;
	194
	195	of_node_put(panel);
	196	}
	197
d8f4a9ed TR	198	output->edid = of_get_property(output->of_node, "nvidia,edid", &size);
	199
	200	ddc = of_parse_phandle(output->of_node, "nvidia,ddc-i2c-bus", 0);
	201	if (ddc) {
	202	output->ddc = of_find_i2c_adapter_by_node(ddc);
	203	if (!output->ddc) {
	204	err = -EPROBE_DEFER;
	205	of_node_put(ddc);
	206	return err;
	207	}
	208
	209	of_node_put(ddc);
	210	}
	211
d8f4a9ed TR	212	output->hpd_gpio = of_get_named_gpio_flags(output->of_node,
	213	"nvidia,hpd-gpio", 0,
	214	&flags);
d8f4a9ed TR	215	if (gpio_is_valid(output->hpd_gpio)) {
	216	unsigned long flags;
	217
	218	err = gpio_request_one(output->hpd_gpio, GPIOF_DIR_IN,
	219	"HDMI hotplug detect");
	220	if (err < 0) {
	221	dev_err(output->dev, "gpio_request_one(): %d\n", err);
	222	return err;
	223	}
	224
	225	err = gpio_to_irq(output->hpd_gpio);
	226	if (err < 0) {
	227	dev_err(output->dev, "gpio_to_irq(): %d\n", err);
59d29c0e TR	228	gpio_free(output->hpd_gpio);
59d29c0e TR	229	return err;
d8f4a9ed TR	230	}
	231
	232	output->hpd_irq = err;
	233
	234	flags = IRQF_TRIGGER_RISING \| IRQF_TRIGGER_FALLING \|
	235	IRQF_ONESHOT;
	236
	237	err = request_threaded_irq(output->hpd_irq, NULL, hpd_irq,
	238	flags, "hpd", output);
	239	if (err < 0) {
	240	dev_err(output->dev, "failed to request IRQ#%u: %d\n",
	241	output->hpd_irq, err);
59d29c0e TR	242	gpio_free(output->hpd_gpio);
59d29c0e TR	243	return err;
d8f4a9ed TR	244	}
	245
	246	output->connector.polled = DRM_CONNECTOR_POLL_HPD;
8fc8f7da TR	247
	248	/*
	249	* Disable the interrupt until the connector has been
	250	* initialized to avoid a race in the hotplug interrupt
	251	* handler.
	252	*/
	253	disable_irq(output->hpd_irq);
d8f4a9ed TR	254	}
d8f4a9ed TR	255
59d29c0e TR	256	return 0;
	257	}
	258
	259	int tegra_output_remove(struct tegra_output *output)
	260	{
	261	if (gpio_is_valid(output->hpd_gpio)) {
	262	free_irq(output->hpd_irq, output);
	263	gpio_free(output->hpd_gpio);
	264	}
	265
	266	if (output->ddc)
	267	put_device(&output->ddc->dev);
	268
	269	return 0;
	270	}
	271
	272	int tegra_output_init(struct drm_device drm, struct tegra_output output)
	273	{
	274	int connector, encoder;
	275
d8f4a9ed TR	276	switch (output->type) {
	277	case TEGRA_OUTPUT_RGB:
	278	connector = DRM_MODE_CONNECTOR_LVDS;
	279	encoder = DRM_MODE_ENCODER_LVDS;
	280	break;
	281
edec4af4 TR	282	case TEGRA_OUTPUT_HDMI:
	283	connector = DRM_MODE_CONNECTOR_HDMIA;
	284	encoder = DRM_MODE_ENCODER_TMDS;
	285	break;
	286
dec72739 TR	287	case TEGRA_OUTPUT_DSI:
	288	connector = DRM_MODE_CONNECTOR_DSI;
	289	encoder = DRM_MODE_ENCODER_DSI;
	290	break;
	291
6b6b6042 TR	292	case TEGRA_OUTPUT_EDP:
	293	connector = DRM_MODE_CONNECTOR_eDP;
	294	encoder = DRM_MODE_ENCODER_TMDS;
	295	break;
	296
d8f4a9ed TR	297	default:
	298	connector = DRM_MODE_CONNECTOR_Unknown;
	299	encoder = DRM_MODE_ENCODER_NONE;
	300	break;
	301	}
	302
	303	drm_connector_init(drm, &output->connector, &connector_funcs,
	304	connector);
	305	drm_connector_helper_add(&output->connector, &connector_helper_funcs);
f8c33255	306	output->connector.dpms = DRM_MODE_DPMS_OFF;
d8f4a9ed	307
9be7d864 TR	308	if (output->panel)
	309	drm_panel_attach(output->panel, &output->connector);
	310
d8f4a9ed TR	311	drm_encoder_init(drm, &output->encoder, &encoder_funcs, encoder);
	312	drm_encoder_helper_add(&output->encoder, &encoder_helper_funcs);
	313
	314	drm_mode_connector_attach_encoder(&output->connector, &output->encoder);
34ea3d38	315	drm_connector_register(&output->connector);
d8f4a9ed TR	316
	317	output->encoder.possible_crtcs = 0x3;
	318
8fc8f7da TR	319	/*
	320	* The connector is now registered and ready to receive hotplug events
	321	* so the hotplug interrupt can be enabled.
	322	*/
	323	if (gpio_is_valid(output->hpd_gpio))
	324	enable_irq(output->hpd_irq);
	325
d8f4a9ed	326	return 0;
d8f4a9ed TR	327	}
	328
	329	int tegra_output_exit(struct tegra_output *output)
	330	{
8fc8f7da TR	331	/*
	332	* The connector is going away, so the interrupt must be disabled to
	333	* prevent the hotplug interrupt handler from potentially crashing.
	334	*/
	335	if (gpio_is_valid(output->hpd_gpio))
	336	disable_irq(output->hpd_irq);
	337
9aaa0ceb TR	338	if (output->panel)
	339	drm_panel_detach(output->panel);
	340
d8f4a9ed TR	341	return 0;
d8f4a9ed TR	342	}