[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 (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 drm_connector_clear(struct drm_connector *connector)
{
	memset(connector, 0, sizeof(*connector));
}

static void tegra_connector_destroy(struct drm_connector *connector)
{
	drm_sysfs_connector_remove(connector);
	drm_connector_cleanup(connector);
	drm_connector_clear(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 drm_encoder_clear(struct drm_encoder *encoder)
{
	memset(encoder, 0, sizeof(*encoder));
}

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

static void tegra_encoder_commit(struct drm_encoder *encoder)
{
}

static void tegra_encoder_mode_set(struct drm_encoder *encoder,
				   struct drm_display_mode *mode,
				   struct drm_display_mode *adjusted)
{
	struct tegra_output *output = encoder_to_output(encoder);
	int err;

	err = tegra_output_enable(output);
	if (err < 0)
		dev_err(encoder->dev->dev, "tegra_output_enable(): %d\n", err);
}

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;

	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;
	size_t size;
	int err;

	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;
	}

	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;

	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_sysfs_connector_add(&output->connector);

	output->encoder.possible_crtcs = 0x3;

	return 0;
}

int tegra_output_exit(struct tegra_output *output)
{
	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
	80	if (gpio_is_valid(output->hpd_gpio)) {
	81	if (gpio_get_value(output->hpd_gpio) == 0)
	82	status = connector_status_disconnected;
	83	else
	84	status = connector_status_connected;
	85	} else {
9be7d864 TR	86	if (!output->panel)
	87	status = connector_status_disconnected;
	88	else
	89	status = connector_status_connected;
	90
d8f4a9ed TR	91	if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS)
	92	status = connector_status_connected;
	93	}
	94
	95	return status;
	96	}
	97
f002abc1 TR	98	static void drm_connector_clear(struct drm_connector *connector)
	99	{
	100	memset(connector, 0, sizeof(*connector));
	101	}
	102
d8f4a9ed TR	103	static void tegra_connector_destroy(struct drm_connector *connector)
	104	{
	105	drm_sysfs_connector_remove(connector);
	106	drm_connector_cleanup(connector);
f002abc1	107	drm_connector_clear(connector);
d8f4a9ed TR	108	}
	109
	110	static const struct drm_connector_funcs connector_funcs = {
	111	.dpms = drm_helper_connector_dpms,
	112	.detect = tegra_connector_detect,
	113	.fill_modes = drm_helper_probe_single_connector_modes,
	114	.destroy = tegra_connector_destroy,
	115	};
	116
f002abc1 TR	117	static void drm_encoder_clear(struct drm_encoder *encoder)
	118	{
	119	memset(encoder, 0, sizeof(*encoder));
	120	}
	121
d8f4a9ed TR	122	static void tegra_encoder_destroy(struct drm_encoder *encoder)
	123	{
	124	drm_encoder_cleanup(encoder);
f002abc1	125	drm_encoder_clear(encoder);
d8f4a9ed TR	126	}
	127
	128	static const struct drm_encoder_funcs encoder_funcs = {
	129	.destroy = tegra_encoder_destroy,
	130	};
	131
	132	static void tegra_encoder_dpms(struct drm_encoder *encoder, int mode)
	133	{
9be7d864 TR	134	struct tegra_output *output = encoder_to_output(encoder);
	135	struct drm_panel *panel = output->panel;
	136
b5190022 TR	137	if (mode != DRM_MODE_DPMS_ON) {
	138	drm_panel_disable(panel);
	139	tegra_output_disable(output);
	140	} else {
	141	tegra_output_enable(output);
	142	drm_panel_enable(panel);
9be7d864	143	}
d8f4a9ed TR	144	}
	145
	146	static bool tegra_encoder_mode_fixup(struct drm_encoder *encoder,
	147	const struct drm_display_mode *mode,
	148	struct drm_display_mode *adjusted)
	149	{
	150	return true;
	151	}
	152
	153	static void tegra_encoder_prepare(struct drm_encoder *encoder)
	154	{
	155	}
	156
	157	static void tegra_encoder_commit(struct drm_encoder *encoder)
	158	{
	159	}
	160
	161	static void tegra_encoder_mode_set(struct drm_encoder *encoder,
	162	struct drm_display_mode *mode,
	163	struct drm_display_mode *adjusted)
	164	{
	165	struct tegra_output *output = encoder_to_output(encoder);
	166	int err;
	167
	168	err = tegra_output_enable(output);
	169	if (err < 0)
	170	dev_err(encoder->dev->dev, "tegra_output_enable(): %d\n", err);
	171	}
	172
	173	static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
	174	.dpms = tegra_encoder_dpms,
	175	.mode_fixup = tegra_encoder_mode_fixup,
	176	.prepare = tegra_encoder_prepare,
	177	.commit = tegra_encoder_commit,
	178	.mode_set = tegra_encoder_mode_set,
	179	};
	180
	181	static irqreturn_t hpd_irq(int irq, void *data)
	182	{
	183	struct tegra_output *output = data;
	184
	185	drm_helper_hpd_irq_event(output->connector.dev);
	186
	187	return IRQ_HANDLED;
	188	}
	189
59d29c0e	190	int tegra_output_probe(struct tegra_output *output)
d8f4a9ed	191	{
9be7d864	192	struct device_node ddc, panel;
d8f4a9ed	193	enum of_gpio_flags flags;
d8f4a9ed TR	194	size_t size;
	195	int err;
	196
	197	if (!output->of_node)
	198	output->of_node = output->dev->of_node;
	199
9be7d864 TR	200	panel = of_parse_phandle(output->of_node, "nvidia,panel", 0);
	201	if (panel) {
	202	output->panel = of_drm_find_panel(panel);
	203	if (!output->panel)
	204	return -EPROBE_DEFER;
	205
	206	of_node_put(panel);
	207	}
	208
d8f4a9ed TR	209	output->edid = of_get_property(output->of_node, "nvidia,edid", &size);
	210
	211	ddc = of_parse_phandle(output->of_node, "nvidia,ddc-i2c-bus", 0);
	212	if (ddc) {
	213	output->ddc = of_find_i2c_adapter_by_node(ddc);
	214	if (!output->ddc) {
	215	err = -EPROBE_DEFER;
	216	of_node_put(ddc);
	217	return err;
	218	}
	219
	220	of_node_put(ddc);
	221	}
	222
d8f4a9ed TR	223	output->hpd_gpio = of_get_named_gpio_flags(output->of_node,
	224	"nvidia,hpd-gpio", 0,
	225	&flags);
d8f4a9ed TR	226	if (gpio_is_valid(output->hpd_gpio)) {
	227	unsigned long flags;
	228
	229	err = gpio_request_one(output->hpd_gpio, GPIOF_DIR_IN,
	230	"HDMI hotplug detect");
	231	if (err < 0) {
	232	dev_err(output->dev, "gpio_request_one(): %d\n", err);
	233	return err;
	234	}
	235
	236	err = gpio_to_irq(output->hpd_gpio);
	237	if (err < 0) {
	238	dev_err(output->dev, "gpio_to_irq(): %d\n", err);
59d29c0e TR	239	gpio_free(output->hpd_gpio);
59d29c0e TR	240	return err;
d8f4a9ed TR	241	}
	242
	243	output->hpd_irq = err;
	244
	245	flags = IRQF_TRIGGER_RISING \| IRQF_TRIGGER_FALLING \|
	246	IRQF_ONESHOT;
	247
	248	err = request_threaded_irq(output->hpd_irq, NULL, hpd_irq,
	249	flags, "hpd", output);
	250	if (err < 0) {
	251	dev_err(output->dev, "failed to request IRQ#%u: %d\n",
	252	output->hpd_irq, err);
59d29c0e TR	253	gpio_free(output->hpd_gpio);
59d29c0e TR	254	return err;
d8f4a9ed TR	255	}
	256
	257	output->connector.polled = DRM_CONNECTOR_POLL_HPD;
	258	}
	259
59d29c0e TR	260	return 0;
	261	}
	262
	263	int tegra_output_remove(struct tegra_output *output)
	264	{
	265	if (gpio_is_valid(output->hpd_gpio)) {
	266	free_irq(output->hpd_irq, output);
	267	gpio_free(output->hpd_gpio);
	268	}
	269
	270	if (output->ddc)
	271	put_device(&output->ddc->dev);
	272
	273	return 0;
	274	}
	275
	276	int tegra_output_init(struct drm_device drm, struct tegra_output output)
	277	{
	278	int connector, encoder;
	279
d8f4a9ed TR	280	switch (output->type) {
	281	case TEGRA_OUTPUT_RGB:
	282	connector = DRM_MODE_CONNECTOR_LVDS;
	283	encoder = DRM_MODE_ENCODER_LVDS;
	284	break;
	285
edec4af4 TR	286	case TEGRA_OUTPUT_HDMI:
	287	connector = DRM_MODE_CONNECTOR_HDMIA;
	288	encoder = DRM_MODE_ENCODER_TMDS;
	289	break;
	290
dec72739 TR	291	case TEGRA_OUTPUT_DSI:
	292	connector = DRM_MODE_CONNECTOR_DSI;
	293	encoder = DRM_MODE_ENCODER_DSI;
	294	break;
	295
d8f4a9ed TR	296	default:
	297	connector = DRM_MODE_CONNECTOR_Unknown;
	298	encoder = DRM_MODE_ENCODER_NONE;
	299	break;
	300	}
	301
	302	drm_connector_init(drm, &output->connector, &connector_funcs,
	303	connector);
	304	drm_connector_helper_add(&output->connector, &connector_helper_funcs);
f8c33255	305	output->connector.dpms = DRM_MODE_DPMS_OFF;
d8f4a9ed	306
9be7d864 TR	307	if (output->panel)
	308	drm_panel_attach(output->panel, &output->connector);
	309
d8f4a9ed TR	310	drm_encoder_init(drm, &output->encoder, &encoder_funcs, encoder);
	311	drm_encoder_helper_add(&output->encoder, &encoder_helper_funcs);
	312
	313	drm_mode_connector_attach_encoder(&output->connector, &output->encoder);
	314	drm_sysfs_connector_add(&output->connector);
	315
	316	output->encoder.possible_crtcs = 0x3;
	317
	318	return 0;
d8f4a9ed TR	319	}
	320
	321	int tegra_output_exit(struct tegra_output *output)
	322	{
d8f4a9ed TR	323	return 0;
d8f4a9ed TR	324	}