[deliverable/linux.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 <drm/drm_atomic_helper.h>

#include <linux/regulator/consumer.h>

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

#include "exynos_drm_drv.h"

struct exynos_dpi {
	struct exynos_drm_display display;
	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 inline struct exynos_dpi *display_to_dpi(struct exynos_drm_display *d)
{
	return container_of(d, struct exynos_dpi, display);
}

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 && !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_connector_unregister(connector);
	drm_connector_cleanup(connector);
}

static struct drm_connector_funcs exynos_dpi_connector_funcs = {
	.dpms = drm_atomic_helper_connector_dpms,
	.detect = exynos_dpi_detect,
	.fill_modes = drm_helper_probe_single_connector_modes,
	.destroy = exynos_dpi_connector_destroy,
	.reset = drm_atomic_helper_connector_reset,
	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};

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_to_dpi(display);
	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_connector_register(connector);
	drm_mode_connector_attach_encoder(connector, encoder);

	return 0;
}

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

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

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

	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
};

/* 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;

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

	ctx->display.type = EXYNOS_DISPLAY_TYPE_LCD;
	ctx->display.ops = &exynos_dpi_display_ops;
	ctx->dev = dev;
	ctx->dpms_mode = DRM_MODE_DPMS_OFF;

	ret = exynos_dpi_parse_dt(ctx);
	if (ret < 0) {
		devm_kfree(dev, ctx);
		return NULL;
	}

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

	return &ctx->display;
}

int exynos_dpi_remove(struct exynos_drm_display *display)
{
	struct exynos_dpi *ctx = display_to_dpi(display);

	exynos_dpi_dpms(&ctx->display, DRM_MODE_DPMS_OFF);

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

	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>
4ea9526b	16	#include <drm/drm_atomic_helper.h>
14b6873a AH	17
	18	#include <linux/regulator/consumer.h>
	19
	20	#include <video/of_videomode.h>
	21	#include <video/videomode.h>
	22
	23	#include "exynos_drm_drv.h"
	24
	25	struct exynos_dpi {
4cfde1f2	26	struct exynos_drm_display display;
14b6873a AH	27	struct device *dev;
	28	struct device_node *panel_node;
	29
	30	struct drm_panel *panel;
	31	struct drm_connector connector;
	32	struct drm_encoder *encoder;
	33
	34	struct videomode *vm;
	35	int dpms_mode;
	36	};
	37
	38	#define connector_to_dpi(c) container_of(c, struct exynos_dpi, connector)
	39
4cfde1f2 AH	40	static inline struct exynos_dpi display_to_dpi(struct exynos_drm_display d)
	41	{
	42	return container_of(d, struct exynos_dpi, display);
	43	}
	44
14b6873a AH	45	static enum drm_connector_status
	46	exynos_dpi_detect(struct drm_connector *connector, bool force)
	47	{
	48	struct exynos_dpi *ctx = connector_to_dpi(connector);
	49
aaa51b13	50	if (ctx->panel && !ctx->panel->connector)
000cc920	51	drm_panel_attach(ctx->panel, &ctx->connector);
14b6873a	52
000cc920	53	return connector_status_connected;
14b6873a AH	54	}
	55
	56	static void exynos_dpi_connector_destroy(struct drm_connector *connector)
	57	{
34ea3d38	58	drm_connector_unregister(connector);
14b6873a AH	59	drm_connector_cleanup(connector);
	60	}
	61
	62	static struct drm_connector_funcs exynos_dpi_connector_funcs = {
63498e30	63	.dpms = drm_atomic_helper_connector_dpms,
14b6873a AH	64	.detect = exynos_dpi_detect,
	65	.fill_modes = drm_helper_probe_single_connector_modes,
	66	.destroy = exynos_dpi_connector_destroy,
4ea9526b GP	67	.reset = drm_atomic_helper_connector_reset,
	68	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
	69	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
14b6873a AH	70	};
	71
	72	static int exynos_dpi_get_modes(struct drm_connector *connector)
	73	{
	74	struct exynos_dpi *ctx = connector_to_dpi(connector);
	75
	76	/* fimd timings gets precedence over panel modes */
	77	if (ctx->vm) {
	78	struct drm_display_mode *mode;
	79
	80	mode = drm_mode_create(connector->dev);
	81	if (!mode) {
	82	DRM_ERROR("failed to create a new display mode\n");
	83	return 0;
	84	}
	85	drm_display_mode_from_videomode(ctx->vm, mode);
	86	mode->type = DRM_MODE_TYPE_DRIVER \| DRM_MODE_TYPE_PREFERRED;
	87	drm_mode_probed_add(connector, mode);
	88	return 1;
	89	}
	90
	91	if (ctx->panel)
	92	return ctx->panel->funcs->get_modes(ctx->panel);
	93
	94	return 0;
	95	}
	96
14b6873a AH	97	static struct drm_encoder *
	98	exynos_dpi_best_encoder(struct drm_connector *connector)
	99	{
	100	struct exynos_dpi *ctx = connector_to_dpi(connector);
	101
	102	return ctx->encoder;
	103	}
	104
	105	static struct drm_connector_helper_funcs exynos_dpi_connector_helper_funcs = {
	106	.get_modes = exynos_dpi_get_modes,
14b6873a AH	107	.best_encoder = exynos_dpi_best_encoder,
	108	};
	109
	110	static int exynos_dpi_create_connector(struct exynos_drm_display *display,
	111	struct drm_encoder *encoder)
	112	{
5af3d9bb	113	struct exynos_dpi *ctx = display_to_dpi(display);
14b6873a AH	114	struct drm_connector *connector = &ctx->connector;
	115	int ret;
	116
	117	ctx->encoder = encoder;
	118
ae08fe6c	119	connector->polled = DRM_CONNECTOR_POLL_HPD;
14b6873a AH	120
	121	ret = drm_connector_init(encoder->dev, connector,
	122	&exynos_dpi_connector_funcs,
	123	DRM_MODE_CONNECTOR_VGA);
	124	if (ret) {
	125	DRM_ERROR("failed to initialize connector with drm\n");
	126	return ret;
	127	}
	128
	129	drm_connector_helper_add(connector, &exynos_dpi_connector_helper_funcs);
34ea3d38	130	drm_connector_register(connector);
14b6873a AH	131	drm_mode_connector_attach_encoder(connector, encoder);
	132
	133	return 0;
	134	}
	135
	136	static void exynos_dpi_poweron(struct exynos_dpi *ctx)
	137	{
39bbde9c AK	138	if (ctx->panel) {
39bbde9c AK	139	drm_panel_prepare(ctx->panel);
14b6873a	140	drm_panel_enable(ctx->panel);
39bbde9c	141	}
14b6873a AH	142	}
	143
	144	static void exynos_dpi_poweroff(struct exynos_dpi *ctx)
	145	{
39bbde9c	146	if (ctx->panel) {
14b6873a	147	drm_panel_disable(ctx->panel);
39bbde9c AK	148	drm_panel_unprepare(ctx->panel);
39bbde9c AK	149	}
14b6873a AH	150	}
	151
	152	static void exynos_dpi_dpms(struct exynos_drm_display *display, int mode)
	153	{
5af3d9bb	154	struct exynos_dpi *ctx = display_to_dpi(display);
14b6873a AH	155
	156	switch (mode) {
	157	case DRM_MODE_DPMS_ON:
	158	if (ctx->dpms_mode != DRM_MODE_DPMS_ON)
	159	exynos_dpi_poweron(ctx);
	160	break;
	161	case DRM_MODE_DPMS_STANDBY:
	162	case DRM_MODE_DPMS_SUSPEND:
	163	case DRM_MODE_DPMS_OFF:
	164	if (ctx->dpms_mode == DRM_MODE_DPMS_ON)
	165	exynos_dpi_poweroff(ctx);
	166	break;
	167	default:
	168	break;
10d9b4ed	169	}
14b6873a AH	170	ctx->dpms_mode = mode;
	171	}
	172
	173	static struct exynos_drm_display_ops exynos_dpi_display_ops = {
	174	.create_connector = exynos_dpi_create_connector,
	175	.dpms = exynos_dpi_dpms
	176	};
	177
14b6873a AH	178	/* of_* functions will be removed after merge of of_graph patches */
	179	static struct device_node *
	180	of_get_child_by_name_reg(struct device_node parent, const char name, u32 reg)
	181	{
	182	struct device_node *np;
	183
	184	for_each_child_of_node(parent, np) {
	185	u32 r;
	186
	187	if (!np->name \|\| of_node_cmp(np->name, name))
	188	continue;
	189
	190	if (of_property_read_u32(np, "reg", &r) < 0)
	191	r = 0;
	192
	193	if (reg == r)
	194	break;
	195	}
	196
	197	return np;
	198	}
	199
	200	static struct device_node of_graph_get_port_by_reg(struct device_node parent,
	201	u32 reg)
	202	{
	203	struct device_node ports, port;
	204
	205	ports = of_get_child_by_name(parent, "ports");
	206	if (ports)
	207	parent = ports;
	208
	209	port = of_get_child_by_name_reg(parent, "port", reg);
	210
	211	of_node_put(ports);
	212
	213	return port;
	214	}
	215
	216	static struct device_node *
	217	of_graph_get_endpoint_by_reg(struct device_node *port, u32 reg)
	218	{
	219	return of_get_child_by_name_reg(port, "endpoint", reg);
	220	}
	221
	222	static struct device_node *
	223	of_graph_get_remote_port_parent(const struct device_node *node)
	224	{
	225	struct device_node *np;
	226	unsigned int depth;
	227
	228	np = of_parse_phandle(node, "remote-endpoint", 0);
	229
	230	/* Walk 3 levels up only if there is 'ports' node. */
	231	for (depth = 3; depth && np; depth--) {
	232	np = of_get_next_parent(np);
	233	if (depth == 2 && of_node_cmp(np->name, "ports"))
	234	break;
	235	}
	236	return np;
	237	}
	238
	239	enum {
	240	FIMD_PORT_IN0,
	241	FIMD_PORT_IN1,
242	FIMD_PORT_IN2,
243	FIMD_PORT_RGB,
244	FIMD_PORT_WRB,
245	};
246
f46ed1ab	247	static struct device_node exynos_dpi_of_find_panel_node(struct device dev)
14b6873a AH	248	{
	249	struct device_node np, ep;
	250
	251	np = of_graph_get_port_by_reg(dev->of_node, FIMD_PORT_RGB);
	252	if (!np)
	253	return NULL;
	254
	255	ep = of_graph_get_endpoint_by_reg(np, 0);
	256	of_node_put(np);
	257	if (!ep)
	258	return NULL;
	259
	260	np = of_graph_get_remote_port_parent(ep);
	261	of_node_put(ep);
	262
	263	return np;
	264	}
	265
	266	static int exynos_dpi_parse_dt(struct exynos_dpi *ctx)
	267	{
	268	struct device *dev = ctx->dev;
	269	struct device_node *dn = dev->of_node;
	270	struct device_node *np;
	271
	272	ctx->panel_node = exynos_dpi_of_find_panel_node(dev);
	273
	274	np = of_get_child_by_name(dn, "display-timings");
	275	if (np) {
	276	struct videomode *vm;
	277	int ret;
	278
	279	of_node_put(np);
	280
	281	vm = devm_kzalloc(dev, sizeof(*ctx->vm), GFP_KERNEL);
	282	if (!vm)
	283	return -ENOMEM;
	284
	285	ret = of_get_videomode(dn, vm, 0);
000cc920 AH	286	if (ret < 0) {
000cc920 AH	287	devm_kfree(dev, vm);
14b6873a	288	return ret;
000cc920	289	}
14b6873a AH	290
	291	ctx->vm = vm;
	292
	293	return 0;
	294	}
	295
	296	if (!ctx->panel_node)
	297	return -EINVAL;
	298
	299	return 0;
	300	}
	301
000cc920	302	struct exynos_drm_display exynos_dpi_probe(struct device dev)
14b6873a AH	303	{
	304	struct exynos_dpi *ctx;
	305	int ret;
	306
	307	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
	308	if (!ctx)
4cfde1f2	309	return ERR_PTR(-ENOMEM);
14b6873a	310
4cfde1f2 AH	311	ctx->display.type = EXYNOS_DISPLAY_TYPE_LCD;
4cfde1f2 AH	312	ctx->display.ops = &exynos_dpi_display_ops;
14b6873a	313	ctx->dev = dev;
14b6873a AH	314	ctx->dpms_mode = DRM_MODE_DPMS_OFF;
	315
	316	ret = exynos_dpi_parse_dt(ctx);
000cc920 AH	317	if (ret < 0) {
000cc920 AH	318	devm_kfree(dev, ctx);
86650408	319	return NULL;
000cc920 AH	320	}
	321
	322	if (ctx->panel_node) {
	323	ctx->panel = of_drm_find_panel(ctx->panel_node);
86650408	324	if (!ctx->panel)
000cc920 AH	325	return ERR_PTR(-EPROBE_DEFER);
000cc920 AH	326	}
14b6873a	327
4cfde1f2	328	return &ctx->display;
14b6873a AH	329	}
14b6873a AH	330
4cfde1f2	331	int exynos_dpi_remove(struct exynos_drm_display *display)
14b6873a	332	{
4cfde1f2	333	struct exynos_dpi *ctx = display_to_dpi(display);
f37cd5e8	334
4cfde1f2	335	exynos_dpi_dpms(&ctx->display, DRM_MODE_DPMS_OFF);
90eac897	336
90eac897 AH	337	if (ctx->panel)
90eac897 AH	338	drm_panel_detach(ctx->panel);
14b6873a AH	339
	340	return 0;
	341	}