[linux-2.6-block.git] / drivers / gpu / drm / exynos / exynos_drm_dpi.c

/*
 * Exynos DRM Parallel output support.
 *
 * Copyright (c) 2014 Samsung Electronics Co., Ltd
 *
 * Contacts: Andrzej Hajda <a.hajda@samsung.com>
 *
 * 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 <drm/drmP.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_panel.h>

#include <linux/regulator/consumer.h>

#include <video/of_videomode.h>
#include <video/videomode.h>

#include "exynos_drm_drv.h"

struct exynos_dpi {
	struct device *dev;
	struct device_node *panel_node;

	struct drm_panel *panel;
	struct drm_connector connector;
	struct drm_encoder *encoder;

	struct videomode *vm;
	int dpms_mode;
};

#define connector_to_dpi(c) container_of(c, struct exynos_dpi, connector)

static enum drm_connector_status
exynos_dpi_detect(struct drm_connector *connector, bool force)
{
	struct exynos_dpi *ctx = connector_to_dpi(connector);

	if (!ctx->panel->connector)
		drm_panel_attach(ctx->panel, &ctx->connector);

	return connector_status_connected;
}

static void exynos_dpi_connector_destroy(struct drm_connector *connector)
{
	drm_sysfs_connector_remove(connector);
	drm_connector_cleanup(connector);
}

static struct drm_connector_funcs exynos_dpi_connector_funcs = {
	.dpms = drm_helper_connector_dpms,
	.detect = exynos_dpi_detect,
	.fill_modes = drm_helper_probe_single_connector_modes,
	.destroy = exynos_dpi_connector_destroy,
};

static int exynos_dpi_get_modes(struct drm_connector *connector)
{
	struct exynos_dpi *ctx = connector_to_dpi(connector);

	/* fimd timings gets precedence over panel modes */
	if (ctx->vm) {
		struct drm_display_mode *mode;

		mode = drm_mode_create(connector->dev);
		if (!mode) {
			DRM_ERROR("failed to create a new display mode\n");
			return 0;
		}
		drm_display_mode_from_videomode(ctx->vm, mode);
		mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
		drm_mode_probed_add(connector, mode);
		return 1;
	}

	if (ctx->panel)
		return ctx->panel->funcs->get_modes(ctx->panel);

	return 0;
}

static struct drm_encoder *
exynos_dpi_best_encoder(struct drm_connector *connector)
{
	struct exynos_dpi *ctx = connector_to_dpi(connector);

	return ctx->encoder;
}

static struct drm_connector_helper_funcs exynos_dpi_connector_helper_funcs = {
	.get_modes = exynos_dpi_get_modes,
	.best_encoder = exynos_dpi_best_encoder,
};

static int exynos_dpi_create_connector(struct exynos_drm_display *display,
				       struct drm_encoder *encoder)
{
	struct exynos_dpi *ctx = display->ctx;
	struct drm_connector *connector = &ctx->connector;
	int ret;

	ctx->encoder = encoder;

	connector->polled = DRM_CONNECTOR_POLL_HPD;

	ret = drm_connector_init(encoder->dev, connector,
				 &exynos_dpi_connector_funcs,
				 DRM_MODE_CONNECTOR_VGA);
	if (ret) {
		DRM_ERROR("failed to initialize connector with drm\n");
		return ret;
	}

	drm_connector_helper_add(connector, &exynos_dpi_connector_helper_funcs);
	drm_sysfs_connector_add(connector);
	drm_mode_connector_attach_encoder(connector, encoder);

	return 0;
}

static void exynos_dpi_poweron(struct exynos_dpi *ctx)
{
	if (ctx->panel)
		drm_panel_enable(ctx->panel);
}

static void exynos_dpi_poweroff(struct exynos_dpi *ctx)
{
	if (ctx->panel)
		drm_panel_disable(ctx->panel);
}

static void exynos_dpi_dpms(struct exynos_drm_display *display, int mode)
{
	struct exynos_dpi *ctx = display->ctx;

	switch (mode) {
	case DRM_MODE_DPMS_ON:
		if (ctx->dpms_mode != DRM_MODE_DPMS_ON)
				exynos_dpi_poweron(ctx);
			break;
	case DRM_MODE_DPMS_STANDBY:
	case DRM_MODE_DPMS_SUSPEND:
	case DRM_MODE_DPMS_OFF:
		if (ctx->dpms_mode == DRM_MODE_DPMS_ON)
			exynos_dpi_poweroff(ctx);
		break;
	default:
		break;
	}
	ctx->dpms_mode = mode;
}

static struct exynos_drm_display_ops exynos_dpi_display_ops = {
	.create_connector = exynos_dpi_create_connector,
	.dpms = exynos_dpi_dpms
};

static struct exynos_drm_display exynos_dpi_display = {
	.type = EXYNOS_DISPLAY_TYPE_LCD,
	.ops = &exynos_dpi_display_ops,
};

/* of_* functions will be removed after merge of of_graph patches */
static struct device_node *
of_get_child_by_name_reg(struct device_node *parent, const char *name, u32 reg)
{
	struct device_node *np;

	for_each_child_of_node(parent, np) {
		u32 r;

		if (!np->name || of_node_cmp(np->name, name))
			continue;

		if (of_property_read_u32(np, "reg", &r) < 0)
			r = 0;

		if (reg == r)
			break;
	}

	return np;
}

static struct device_node *of_graph_get_port_by_reg(struct device_node *parent,
						    u32 reg)
{
	struct device_node *ports, *port;

	ports = of_get_child_by_name(parent, "ports");
	if (ports)
		parent = ports;

	port = of_get_child_by_name_reg(parent, "port", reg);

	of_node_put(ports);

	return port;
}

static struct device_node *
of_graph_get_endpoint_by_reg(struct device_node *port, u32 reg)
{
	return of_get_child_by_name_reg(port, "endpoint", reg);
}

static struct device_node *
of_graph_get_remote_port_parent(const struct device_node *node)
{
	struct device_node *np;
	unsigned int depth;

	np = of_parse_phandle(node, "remote-endpoint", 0);

	/* Walk 3 levels up only if there is 'ports' node. */
	for (depth = 3; depth && np; depth--) {
		np = of_get_next_parent(np);
		if (depth == 2 && of_node_cmp(np->name, "ports"))
			break;
	}
	return np;
}

enum {
	FIMD_PORT_IN0,
	FIMD_PORT_IN1,
	FIMD_PORT_IN2,
	FIMD_PORT_RGB,
	FIMD_PORT_WRB,
};

static struct device_node *exynos_dpi_of_find_panel_node(struct device *dev)
{
	struct device_node *np, *ep;

	np = of_graph_get_port_by_reg(dev->of_node, FIMD_PORT_RGB);
	if (!np)
		return NULL;

	ep = of_graph_get_endpoint_by_reg(np, 0);
	of_node_put(np);
	if (!ep)
		return NULL;

	np = of_graph_get_remote_port_parent(ep);
	of_node_put(ep);

	return np;
}

static int exynos_dpi_parse_dt(struct exynos_dpi *ctx)
{
	struct device *dev = ctx->dev;
	struct device_node *dn = dev->of_node;
	struct device_node *np;

	ctx->panel_node = exynos_dpi_of_find_panel_node(dev);

	np = of_get_child_by_name(dn, "display-timings");
	if (np) {
		struct videomode *vm;
		int ret;

		of_node_put(np);

		vm = devm_kzalloc(dev, sizeof(*ctx->vm), GFP_KERNEL);
		if (!vm)
			return -ENOMEM;

		ret = of_get_videomode(dn, vm, 0);
		if (ret < 0) {
			devm_kfree(dev, vm);
			return ret;
		}

		ctx->vm = vm;

		return 0;
	}

	if (!ctx->panel_node)
		return -EINVAL;

	return 0;
}

struct exynos_drm_display *exynos_dpi_probe(struct device *dev)
{
	struct exynos_dpi *ctx;
	int ret;

	ret = exynos_drm_component_add(dev,
					EXYNOS_DEVICE_TYPE_CONNECTOR,
					exynos_dpi_display.type);
	if (ret)
		return ERR_PTR(ret);

	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
	if (!ctx)
		goto err_del_component;

	ctx->dev = dev;
	exynos_dpi_display.ctx = ctx;
	ctx->dpms_mode = DRM_MODE_DPMS_OFF;

	ret = exynos_dpi_parse_dt(ctx);
	if (ret < 0) {
		devm_kfree(dev, ctx);
		goto err_del_component;
	}

	if (ctx->panel_node) {
		ctx->panel = of_drm_find_panel(ctx->panel_node);
		if (!ctx->panel) {
			exynos_drm_component_del(dev,
						EXYNOS_DEVICE_TYPE_CONNECTOR);
			return ERR_PTR(-EPROBE_DEFER);
		}
	}

	return &exynos_dpi_display;

err_del_component:
	exynos_drm_component_del(dev, EXYNOS_DEVICE_TYPE_CONNECTOR);

	return NULL;
}

int exynos_dpi_remove(struct device *dev)
{
	struct drm_encoder *encoder = exynos_dpi_display.encoder;
	struct exynos_dpi *ctx = exynos_dpi_display.ctx;

	exynos_dpi_dpms(&exynos_dpi_display, DRM_MODE_DPMS_OFF);
	encoder->funcs->destroy(encoder);
	drm_connector_cleanup(&ctx->connector);

	exynos_drm_component_del(dev, EXYNOS_DEVICE_TYPE_CONNECTOR);

	return 0;
}
Commit	Line	Data
14b6873a AH	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 device *dev;
	26	struct device_node *panel_node;
	27
	28	struct drm_panel *panel;
	29	struct drm_connector connector;
	30	struct drm_encoder *encoder;
	31
	32	struct videomode *vm;
	33	int dpms_mode;
	34	};
	35
	36	#define connector_to_dpi(c) container_of(c, struct exynos_dpi, connector)
	37
	38	static enum drm_connector_status
	39	exynos_dpi_detect(struct drm_connector *connector, bool force)
	40	{
	41	struct exynos_dpi *ctx = connector_to_dpi(connector);
	42
000cc920 AH	43	if (!ctx->panel->connector)
000cc920 AH	44	drm_panel_attach(ctx->panel, &ctx->connector);
14b6873a	45
000cc920	46	return connector_status_connected;
14b6873a AH	47	}
	48
	49	static void exynos_dpi_connector_destroy(struct drm_connector *connector)
	50	{
	51	drm_sysfs_connector_remove(connector);
	52	drm_connector_cleanup(connector);
	53	}
	54
	55	static struct drm_connector_funcs exynos_dpi_connector_funcs = {
	56	.dpms = drm_helper_connector_dpms,
	57	.detect = exynos_dpi_detect,
	58	.fill_modes = drm_helper_probe_single_connector_modes,
	59	.destroy = exynos_dpi_connector_destroy,
	60	};
	61
	62	static int exynos_dpi_get_modes(struct drm_connector *connector)
	63	{
	64	struct exynos_dpi *ctx = connector_to_dpi(connector);
	65
	66	/* fimd timings gets precedence over panel modes */
	67	if (ctx->vm) {
	68	struct drm_display_mode *mode;
	69
	70	mode = drm_mode_create(connector->dev);
	71	if (!mode) {
	72	DRM_ERROR("failed to create a new display mode\n");
	73	return 0;
	74	}
	75	drm_display_mode_from_videomode(ctx->vm, mode);
	76	mode->type = DRM_MODE_TYPE_DRIVER \| DRM_MODE_TYPE_PREFERRED;
	77	drm_mode_probed_add(connector, mode);
	78	return 1;
	79	}
	80
	81	if (ctx->panel)
	82	return ctx->panel->funcs->get_modes(ctx->panel);
	83
	84	return 0;
	85	}
	86
14b6873a AH	87	static struct drm_encoder *
	88	exynos_dpi_best_encoder(struct drm_connector *connector)
	89	{
	90	struct exynos_dpi *ctx = connector_to_dpi(connector);
	91
	92	return ctx->encoder;
	93	}
	94
	95	static struct drm_connector_helper_funcs exynos_dpi_connector_helper_funcs = {
	96	.get_modes = exynos_dpi_get_modes,
14b6873a AH	97	.best_encoder = exynos_dpi_best_encoder,
	98	};
	99
	100	static int exynos_dpi_create_connector(struct exynos_drm_display *display,
	101	struct drm_encoder *encoder)
	102	{
	103	struct exynos_dpi *ctx = display->ctx;
	104	struct drm_connector *connector = &ctx->connector;
	105	int ret;
	106
	107	ctx->encoder = encoder;
	108
ae08fe6c	109	connector->polled = DRM_CONNECTOR_POLL_HPD;
14b6873a AH	110
	111	ret = drm_connector_init(encoder->dev, connector,
	112	&exynos_dpi_connector_funcs,
	113	DRM_MODE_CONNECTOR_VGA);
	114	if (ret) {
	115	DRM_ERROR("failed to initialize connector with drm\n");
	116	return ret;
	117	}
	118
	119	drm_connector_helper_add(connector, &exynos_dpi_connector_helper_funcs);
	120	drm_sysfs_connector_add(connector);
	121	drm_mode_connector_attach_encoder(connector, encoder);
	122
	123	return 0;
	124	}
	125
	126	static void exynos_dpi_poweron(struct exynos_dpi *ctx)
	127	{
	128	if (ctx->panel)
	129	drm_panel_enable(ctx->panel);
	130	}
	131
	132	static void exynos_dpi_poweroff(struct exynos_dpi *ctx)
	133	{
	134	if (ctx->panel)
	135	drm_panel_disable(ctx->panel);
	136	}
	137
	138	static void exynos_dpi_dpms(struct exynos_drm_display *display, int mode)
	139	{
	140	struct exynos_dpi *ctx = display->ctx;
	141
	142	switch (mode) {
	143	case DRM_MODE_DPMS_ON:
	144	if (ctx->dpms_mode != DRM_MODE_DPMS_ON)
	145	exynos_dpi_poweron(ctx);
	146	break;
	147	case DRM_MODE_DPMS_STANDBY:
	148	case DRM_MODE_DPMS_SUSPEND:
	149	case DRM_MODE_DPMS_OFF:
	150	if (ctx->dpms_mode == DRM_MODE_DPMS_ON)
	151	exynos_dpi_poweroff(ctx);
	152	break;
	153	default:
	154	break;
10d9b4ed	155	}
14b6873a AH	156	ctx->dpms_mode = mode;
	157	}
	158
	159	static struct exynos_drm_display_ops exynos_dpi_display_ops = {
	160	.create_connector = exynos_dpi_create_connector,
	161	.dpms = exynos_dpi_dpms
	162	};
	163
	164	static struct exynos_drm_display exynos_dpi_display = {
	165	.type = EXYNOS_DISPLAY_TYPE_LCD,
	166	.ops = &exynos_dpi_display_ops,
	167	};
	168
	169	/* of_* functions will be removed after merge of of_graph patches */
	170	static struct device_node *
	171	of_get_child_by_name_reg(struct device_node parent, const char name, u32 reg)
	172	{
	173	struct device_node *np;
	174
	175	for_each_child_of_node(parent, np) {
	176	u32 r;
	177
	178	if (!np->name \|\| of_node_cmp(np->name, name))
	179	continue;
	180
	181	if (of_property_read_u32(np, "reg", &r) < 0)
	182	r = 0;
	183
	184	if (reg == r)
	185	break;
	186	}
	187
	188	return np;
	189	}
	190
	191	static struct device_node of_graph_get_port_by_reg(struct device_node parent,
	192	u32 reg)
	193	{
	194	struct device_node ports, port;
	195
	196	ports = of_get_child_by_name(parent, "ports");
	197	if (ports)
	198	parent = ports;
	199
	200	port = of_get_child_by_name_reg(parent, "port", reg);
	201
	202	of_node_put(ports);
	203
	204	return port;
	205	}
	206
	207	static struct device_node *
	208	of_graph_get_endpoint_by_reg(struct device_node *port, u32 reg)
	209	{
	210	return of_get_child_by_name_reg(port, "endpoint", reg);
	211	}
	212
	213	static struct device_node *
	214	of_graph_get_remote_port_parent(const struct device_node *node)
	215	{
	216	struct device_node *np;
	217	unsigned int depth;
	218
	219	np = of_parse_phandle(node, "remote-endpoint", 0);
220
221	/* Walk 3 levels up only if there is 'ports' node. */
222	for (depth = 3; depth && np; depth--) {
223	np = of_get_next_parent(np);
224	if (depth == 2 && of_node_cmp(np->name, "ports"))
225	break;
226	}
227	return np;
228	}
229
230	enum {
231	FIMD_PORT_IN0,
232	FIMD_PORT_IN1,
233	FIMD_PORT_IN2,
234	FIMD_PORT_RGB,
235	FIMD_PORT_WRB,
236	};
237
f46ed1ab	238	static struct device_node exynos_dpi_of_find_panel_node(struct device dev)
14b6873a AH	239	{
	240	struct device_node np, ep;
	241
	242	np = of_graph_get_port_by_reg(dev->of_node, FIMD_PORT_RGB);
	243	if (!np)
	244	return NULL;
	245
	246	ep = of_graph_get_endpoint_by_reg(np, 0);
	247	of_node_put(np);
	248	if (!ep)
	249	return NULL;
	250
	251	np = of_graph_get_remote_port_parent(ep);
	252	of_node_put(ep);
	253
	254	return np;
	255	}
	256
	257	static int exynos_dpi_parse_dt(struct exynos_dpi *ctx)
	258	{
	259	struct device *dev = ctx->dev;
	260	struct device_node *dn = dev->of_node;
	261	struct device_node *np;
	262
	263	ctx->panel_node = exynos_dpi_of_find_panel_node(dev);
	264
	265	np = of_get_child_by_name(dn, "display-timings");
	266	if (np) {
	267	struct videomode *vm;
	268	int ret;
	269
	270	of_node_put(np);
	271
	272	vm = devm_kzalloc(dev, sizeof(*ctx->vm), GFP_KERNEL);
	273	if (!vm)
	274	return -ENOMEM;
	275
	276	ret = of_get_videomode(dn, vm, 0);
000cc920 AH	277	if (ret < 0) {
000cc920 AH	278	devm_kfree(dev, vm);
14b6873a	279	return ret;
000cc920	280	}
14b6873a AH	281
	282	ctx->vm = vm;
	283
	284	return 0;
	285	}
	286
	287	if (!ctx->panel_node)
	288	return -EINVAL;
	289
	290	return 0;
	291	}
	292
000cc920	293	struct exynos_drm_display exynos_dpi_probe(struct device dev)
14b6873a AH	294	{
	295	struct exynos_dpi *ctx;
	296	int ret;
	297
df5225bc ID	298	ret = exynos_drm_component_add(dev,
	299	EXYNOS_DEVICE_TYPE_CONNECTOR,
	300	exynos_dpi_display.type);
	301	if (ret)
	302	return ERR_PTR(ret);
	303
14b6873a AH	304	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
14b6873a AH	305	if (!ctx)
df5225bc	306	goto err_del_component;
14b6873a AH	307
	308	ctx->dev = dev;
	309	exynos_dpi_display.ctx = ctx;
	310	ctx->dpms_mode = DRM_MODE_DPMS_OFF;
	311
	312	ret = exynos_dpi_parse_dt(ctx);
000cc920 AH	313	if (ret < 0) {
000cc920 AH	314	devm_kfree(dev, ctx);
df5225bc	315	goto err_del_component;
000cc920 AH	316	}
	317
	318	if (ctx->panel_node) {
	319	ctx->panel = of_drm_find_panel(ctx->panel_node);
df5225bc ID	320	if (!ctx->panel) {
	321	exynos_drm_component_del(dev,
	322	EXYNOS_DEVICE_TYPE_CONNECTOR);
000cc920	323	return ERR_PTR(-EPROBE_DEFER);
df5225bc	324	}
000cc920	325	}
14b6873a	326
000cc920	327	return &exynos_dpi_display;
df5225bc ID	328
	329	err_del_component:
	330	exynos_drm_component_del(dev, EXYNOS_DEVICE_TYPE_CONNECTOR);
	331
	332	return NULL;
14b6873a AH	333	}
14b6873a AH	334
000cc920	335	int exynos_dpi_remove(struct device *dev)
14b6873a	336	{
f37cd5e8 ID	337	struct drm_encoder *encoder = exynos_dpi_display.encoder;
	338	struct exynos_dpi *ctx = exynos_dpi_display.ctx;
	339
14b6873a	340	exynos_dpi_dpms(&exynos_dpi_display, DRM_MODE_DPMS_OFF);
f37cd5e8 ID	341	encoder->funcs->destroy(encoder);
f37cd5e8 ID	342	drm_connector_cleanup(&ctx->connector);
14b6873a	343
df5225bc ID	344	exynos_drm_component_del(dev, EXYNOS_DEVICE_TYPE_CONNECTOR);
df5225bc ID	345
14b6873a AH	346	return 0;
14b6873a AH	347	}