[deliverable/linux.git] / drivers / gpu / drm / imx / parallel-display.c

/*
 * i.MX drm driver - parallel display implementation
 *
 * Copyright (C) 2012 Sascha Hauer, Pengutronix
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/component.h>
#include <linux/module.h>
#include <drm/drmP.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_panel.h>
#include <linux/videodev2.h>
#include <video/of_display_timing.h>
#include <linux/of_graph.h>

#include "imx-drm.h"

struct imx_parallel_display {
	struct drm_connector connector;
	struct drm_encoder encoder;
	struct device *dev;
	void *edid;
	int edid_len;
	u32 bus_format;
	u32 bus_flags;
	struct drm_display_mode mode;
	struct drm_panel *panel;
	struct drm_bridge *bridge;
};

static inline struct imx_parallel_display *con_to_imxpd(struct drm_connector *c)
{
	return container_of(c, struct imx_parallel_display, connector);
}

static inline struct imx_parallel_display *enc_to_imxpd(struct drm_encoder *e)
{
	return container_of(e, struct imx_parallel_display, encoder);
}

static enum drm_connector_status imx_pd_connector_detect(
		struct drm_connector *connector, bool force)
{
	return connector_status_connected;
}

static int imx_pd_connector_get_modes(struct drm_connector *connector)
{
	struct imx_parallel_display *imxpd = con_to_imxpd(connector);
	struct device_node *np = imxpd->dev->of_node;
	int num_modes = 0;

	if (imxpd->panel && imxpd->panel->funcs &&
	    imxpd->panel->funcs->get_modes) {
		num_modes = imxpd->panel->funcs->get_modes(imxpd->panel);
		if (num_modes > 0)
			return num_modes;
	}

	if (imxpd->edid) {
		drm_mode_connector_update_edid_property(connector, imxpd->edid);
		num_modes = drm_add_edid_modes(connector, imxpd->edid);
	}

	if (np) {
		struct drm_display_mode *mode = drm_mode_create(connector->dev);
		int ret;

		if (!mode)
			return -EINVAL;

		ret = of_get_drm_display_mode(np, &imxpd->mode,
					      &imxpd->bus_flags,
					      OF_USE_NATIVE_MODE);
		if (ret)
			return ret;

		drm_mode_copy(mode, &imxpd->mode);
		mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
		drm_mode_probed_add(connector, mode);
		num_modes++;
	}

	return num_modes;
}

static struct drm_encoder *imx_pd_connector_best_encoder(
		struct drm_connector *connector)
{
	struct imx_parallel_display *imxpd = con_to_imxpd(connector);

	return &imxpd->encoder;
}

static void imx_pd_encoder_enable(struct drm_encoder *encoder)
{
	struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);

	drm_panel_prepare(imxpd->panel);
	drm_panel_enable(imxpd->panel);
}

static void imx_pd_encoder_disable(struct drm_encoder *encoder)
{
	struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);

	drm_panel_disable(imxpd->panel);
	drm_panel_unprepare(imxpd->panel);
}

static int imx_pd_encoder_atomic_check(struct drm_encoder *encoder,
				       struct drm_crtc_state *crtc_state,
				       struct drm_connector_state *conn_state)
{
	struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
	struct drm_display_info *di = &conn_state->connector->display_info;
	struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);

	if (!imxpd->bus_format && di->num_bus_formats) {
		imx_crtc_state->bus_flags = di->bus_flags;
		imx_crtc_state->bus_format = di->bus_formats[0];
	} else {
		imx_crtc_state->bus_flags = imxpd->bus_flags;
		imx_crtc_state->bus_format = imxpd->bus_format;
	}
	imx_crtc_state->di_hsync_pin = 2;
	imx_crtc_state->di_vsync_pin = 3;

	return 0;
}

static const struct drm_connector_funcs imx_pd_connector_funcs = {
	.dpms = drm_atomic_helper_connector_dpms,
	.fill_modes = drm_helper_probe_single_connector_modes,
	.detect = imx_pd_connector_detect,
	.destroy = imx_drm_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 const struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
	.get_modes = imx_pd_connector_get_modes,
	.best_encoder = imx_pd_connector_best_encoder,
};

static const struct drm_encoder_funcs imx_pd_encoder_funcs = {
	.destroy = imx_drm_encoder_destroy,
};

static const struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = {
	.enable = imx_pd_encoder_enable,
	.disable = imx_pd_encoder_disable,
	.atomic_check = imx_pd_encoder_atomic_check,
};

static int imx_pd_register(struct drm_device *drm,
	struct imx_parallel_display *imxpd)
{
	struct drm_encoder *encoder = &imxpd->encoder;
	int ret;

	ret = imx_drm_encoder_parse_of(drm, encoder, imxpd->dev->of_node);
	if (ret)
		return ret;

	/* set the connector's dpms to OFF so that
	 * drm_helper_connector_dpms() won't return
	 * immediately since the current state is ON
	 * at this point.
	 */
	imxpd->connector.dpms = DRM_MODE_DPMS_OFF;

	drm_encoder_helper_add(encoder, &imx_pd_encoder_helper_funcs);
	drm_encoder_init(drm, encoder, &imx_pd_encoder_funcs,
			 DRM_MODE_ENCODER_NONE, NULL);

	if (!imxpd->bridge) {
		drm_connector_helper_add(&imxpd->connector,
				&imx_pd_connector_helper_funcs);
		drm_connector_init(drm, &imxpd->connector,
				   &imx_pd_connector_funcs,
				   DRM_MODE_CONNECTOR_VGA);
	}

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

	if (imxpd->bridge) {
		imxpd->bridge->encoder = encoder;
		encoder->bridge = imxpd->bridge;
		ret = drm_bridge_attach(drm, imxpd->bridge);
		if (ret < 0) {
			dev_err(imxpd->dev, "failed to attach bridge: %d\n",
				ret);
			return ret;
		}
	} else {
		drm_mode_connector_attach_encoder(&imxpd->connector, encoder);
	}

	return 0;
}

static int imx_pd_bind(struct device *dev, struct device *master, void *data)
{
	struct drm_device *drm = data;
	struct device_node *np = dev->of_node;
	struct device_node *ep;
	const u8 *edidp;
	struct imx_parallel_display *imxpd;
	int ret;
	u32 bus_format = 0;
	const char *fmt;

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

	edidp = of_get_property(np, "edid", &imxpd->edid_len);
	if (edidp)
		imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);

	ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
	if (!ret) {
		if (!strcmp(fmt, "rgb24"))
			bus_format = MEDIA_BUS_FMT_RGB888_1X24;
		else if (!strcmp(fmt, "rgb565"))
			bus_format = MEDIA_BUS_FMT_RGB565_1X16;
		else if (!strcmp(fmt, "bgr666"))
			bus_format = MEDIA_BUS_FMT_RGB666_1X18;
		else if (!strcmp(fmt, "lvds666"))
			bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
	}
	imxpd->bus_format = bus_format;

	/* port@1 is the output port */
	ep = of_graph_get_endpoint_by_regs(np, 1, -1);
	if (ep) {
		struct device_node *remote;

		remote = of_graph_get_remote_port_parent(ep);
		if (!remote) {
			dev_warn(dev, "endpoint %s not connected\n",
				 ep->full_name);
			of_node_put(ep);
			return -ENODEV;
		}
		of_node_put(ep);

		imxpd->panel = of_drm_find_panel(remote);
		if (imxpd->panel) {
			dev_dbg(dev, "found panel %s\n", remote->full_name);
		} else {
			imxpd->bridge = of_drm_find_bridge(remote);
			if (imxpd->bridge)
				dev_dbg(dev, "found bridge %s\n",
					remote->full_name);
		}
		if (!imxpd->panel && !imxpd->bridge) {
			dev_dbg(dev, "waiting for panel or bridge %s\n",
				remote->full_name);
			of_node_put(remote);
			return -EPROBE_DEFER;
		}
		of_node_put(remote);
	}

	imxpd->dev = dev;

	ret = imx_pd_register(drm, imxpd);
	if (ret)
		return ret;

	dev_set_drvdata(dev, imxpd);

	return 0;
}

static void imx_pd_unbind(struct device *dev, struct device *master,
	void *data)
{
	struct imx_parallel_display *imxpd = dev_get_drvdata(dev);

	imxpd->encoder.funcs->destroy(&imxpd->encoder);
	imxpd->connector.funcs->destroy(&imxpd->connector);

	kfree(imxpd->edid);
}

static const struct component_ops imx_pd_ops = {
	.bind	= imx_pd_bind,
	.unbind	= imx_pd_unbind,
};

static int imx_pd_probe(struct platform_device *pdev)
{
	return component_add(&pdev->dev, &imx_pd_ops);
}

static int imx_pd_remove(struct platform_device *pdev)
{
	component_del(&pdev->dev, &imx_pd_ops);

	return 0;
}

static const struct of_device_id imx_pd_dt_ids[] = {
	{ .compatible = "fsl,imx-parallel-display", },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);

static struct platform_driver imx_pd_driver = {
	.probe		= imx_pd_probe,
	.remove		= imx_pd_remove,
	.driver		= {
		.of_match_table = imx_pd_dt_ids,
		.name	= "imx-parallel-display",
	},
};

module_platform_driver(imx_pd_driver);

MODULE_DESCRIPTION("i.MX parallel display driver");
MODULE_AUTHOR("Sascha Hauer, Pengutronix");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:imx-parallel-display");
Commit	Line	Data
	1	/*
	2	* i.MX drm driver - parallel display implementation
	3	*
	4	* Copyright (C) 2012 Sascha Hauer, Pengutronix
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* as published by the Free Software Foundation; either version 2
	9	* of the License, or (at your option) any later version.
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*/
	15
	16	#include <linux/component.h>
	17	#include <linux/module.h>
	18	#include <drm/drmP.h>
	19	#include <drm/drm_atomic_helper.h>
	20	#include <drm/drm_fb_helper.h>
	21	#include <drm/drm_crtc_helper.h>
	22	#include <drm/drm_panel.h>
	23	#include <linux/videodev2.h>
	24	#include <video/of_display_timing.h>
	25	#include <linux/of_graph.h>
	26
	27	#include "imx-drm.h"
	28
	29	struct imx_parallel_display {
	30	struct drm_connector connector;
	31	struct drm_encoder encoder;
	32	struct device *dev;
	33	void *edid;
	34	int edid_len;
	35	u32 bus_format;
	36	u32 bus_flags;
	37	struct drm_display_mode mode;
	38	struct drm_panel *panel;
	39	struct drm_bridge *bridge;
	40	};
	41
	42	static inline struct imx_parallel_display con_to_imxpd(struct drm_connector c)
	43	{
	44	return container_of(c, struct imx_parallel_display, connector);
	45	}
	46
	47	static inline struct imx_parallel_display enc_to_imxpd(struct drm_encoder e)
	48	{
	49	return container_of(e, struct imx_parallel_display, encoder);
	50	}
	51
	52	static enum drm_connector_status imx_pd_connector_detect(
	53	struct drm_connector *connector, bool force)
	54	{
	55	return connector_status_connected;
	56	}
	57
	58	static int imx_pd_connector_get_modes(struct drm_connector *connector)
	59	{
	60	struct imx_parallel_display *imxpd = con_to_imxpd(connector);
	61	struct device_node *np = imxpd->dev->of_node;
	62	int num_modes = 0;
	63
	64	if (imxpd->panel && imxpd->panel->funcs &&
	65	imxpd->panel->funcs->get_modes) {
	66	num_modes = imxpd->panel->funcs->get_modes(imxpd->panel);
	67	if (num_modes > 0)
	68	return num_modes;
	69	}
	70
	71	if (imxpd->edid) {
	72	drm_mode_connector_update_edid_property(connector, imxpd->edid);
	73	num_modes = drm_add_edid_modes(connector, imxpd->edid);
	74	}
	75
	76	if (np) {
	77	struct drm_display_mode *mode = drm_mode_create(connector->dev);
	78	int ret;
	79
	80	if (!mode)
	81	return -EINVAL;
	82
	83	ret = of_get_drm_display_mode(np, &imxpd->mode,
	84	&imxpd->bus_flags,
	85	OF_USE_NATIVE_MODE);
	86	if (ret)
	87	return ret;
	88
	89	drm_mode_copy(mode, &imxpd->mode);
	90	mode->type \|= DRM_MODE_TYPE_DRIVER \| DRM_MODE_TYPE_PREFERRED,
	91	drm_mode_probed_add(connector, mode);
	92	num_modes++;
	93	}
	94
	95	return num_modes;
	96	}
	97
	98	static struct drm_encoder *imx_pd_connector_best_encoder(
	99	struct drm_connector *connector)
	100	{
	101	struct imx_parallel_display *imxpd = con_to_imxpd(connector);
	102
	103	return &imxpd->encoder;
	104	}
	105
	106	static void imx_pd_encoder_enable(struct drm_encoder *encoder)
	107	{
	108	struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
	109
	110	drm_panel_prepare(imxpd->panel);
	111	drm_panel_enable(imxpd->panel);
	112	}
	113
	114	static void imx_pd_encoder_disable(struct drm_encoder *encoder)
	115	{
	116	struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
	117
	118	drm_panel_disable(imxpd->panel);
	119	drm_panel_unprepare(imxpd->panel);
	120	}
	121
	122	static int imx_pd_encoder_atomic_check(struct drm_encoder *encoder,
	123	struct drm_crtc_state *crtc_state,
	124	struct drm_connector_state *conn_state)
	125	{
	126	struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
	127	struct drm_display_info *di = &conn_state->connector->display_info;
	128	struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
	129
	130	if (!imxpd->bus_format && di->num_bus_formats) {
	131	imx_crtc_state->bus_flags = di->bus_flags;
	132	imx_crtc_state->bus_format = di->bus_formats[0];
	133	} else {
	134	imx_crtc_state->bus_flags = imxpd->bus_flags;
	135	imx_crtc_state->bus_format = imxpd->bus_format;
	136	}
	137	imx_crtc_state->di_hsync_pin = 2;
	138	imx_crtc_state->di_vsync_pin = 3;
	139
	140	return 0;
	141	}
	142
	143	static const struct drm_connector_funcs imx_pd_connector_funcs = {
	144	.dpms = drm_atomic_helper_connector_dpms,
	145	.fill_modes = drm_helper_probe_single_connector_modes,
	146	.detect = imx_pd_connector_detect,
	147	.destroy = imx_drm_connector_destroy,
	148	.reset = drm_atomic_helper_connector_reset,
	149	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
	150	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
	151	};
	152
	153	static const struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
	154	.get_modes = imx_pd_connector_get_modes,
	155	.best_encoder = imx_pd_connector_best_encoder,
	156	};
	157
	158	static const struct drm_encoder_funcs imx_pd_encoder_funcs = {
	159	.destroy = imx_drm_encoder_destroy,
	160	};
	161
	162	static const struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = {
	163	.enable = imx_pd_encoder_enable,
	164	.disable = imx_pd_encoder_disable,
	165	.atomic_check = imx_pd_encoder_atomic_check,
	166	};
	167
	168	static int imx_pd_register(struct drm_device *drm,
	169	struct imx_parallel_display *imxpd)
	170	{
	171	struct drm_encoder *encoder = &imxpd->encoder;
	172	int ret;
	173
	174	ret = imx_drm_encoder_parse_of(drm, encoder, imxpd->dev->of_node);
	175	if (ret)
	176	return ret;
	177
	178	/* set the connector's dpms to OFF so that
	179	* drm_helper_connector_dpms() won't return
	180	* immediately since the current state is ON
	181	* at this point.
	182	*/
	183	imxpd->connector.dpms = DRM_MODE_DPMS_OFF;
	184
	185	drm_encoder_helper_add(encoder, &imx_pd_encoder_helper_funcs);
	186	drm_encoder_init(drm, encoder, &imx_pd_encoder_funcs,
	187	DRM_MODE_ENCODER_NONE, NULL);
	188
	189	if (!imxpd->bridge) {
	190	drm_connector_helper_add(&imxpd->connector,
	191	&imx_pd_connector_helper_funcs);
	192	drm_connector_init(drm, &imxpd->connector,
	193	&imx_pd_connector_funcs,
	194	DRM_MODE_CONNECTOR_VGA);
	195	}
	196
	197	if (imxpd->panel)
	198	drm_panel_attach(imxpd->panel, &imxpd->connector);
	199
	200	if (imxpd->bridge) {
	201	imxpd->bridge->encoder = encoder;
	202	encoder->bridge = imxpd->bridge;
	203	ret = drm_bridge_attach(drm, imxpd->bridge);
	204	if (ret < 0) {
	205	dev_err(imxpd->dev, "failed to attach bridge: %d\n",
	206	ret);
	207	return ret;
	208	}
	209	} else {
	210	drm_mode_connector_attach_encoder(&imxpd->connector, encoder);
	211	}
	212
	213	return 0;
	214	}
	215
	216	static int imx_pd_bind(struct device dev, struct device master, void *data)
	217	{
	218	struct drm_device *drm = data;
	219	struct device_node *np = dev->of_node;
	220	struct device_node *ep;
	221	const u8 *edidp;
	222	struct imx_parallel_display *imxpd;
	223	int ret;
	224	u32 bus_format = 0;
	225	const char *fmt;
	226
	227	imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL);
	228	if (!imxpd)
	229	return -ENOMEM;
	230
	231	edidp = of_get_property(np, "edid", &imxpd->edid_len);
	232	if (edidp)
	233	imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);
	234
	235	ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
	236	if (!ret) {
	237	if (!strcmp(fmt, "rgb24"))
	238	bus_format = MEDIA_BUS_FMT_RGB888_1X24;
	239	else if (!strcmp(fmt, "rgb565"))
	240	bus_format = MEDIA_BUS_FMT_RGB565_1X16;
	241	else if (!strcmp(fmt, "bgr666"))
	242	bus_format = MEDIA_BUS_FMT_RGB666_1X18;
	243	else if (!strcmp(fmt, "lvds666"))
	244	bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
	245	}
	246	imxpd->bus_format = bus_format;
	247
	248	/* port@1 is the output port */
	249	ep = of_graph_get_endpoint_by_regs(np, 1, -1);
	250	if (ep) {
	251	struct device_node *remote;
	252
	253	remote = of_graph_get_remote_port_parent(ep);
	254	if (!remote) {
	255	dev_warn(dev, "endpoint %s not connected\n",
	256	ep->full_name);
	257	of_node_put(ep);
	258	return -ENODEV;
	259	}
	260	of_node_put(ep);
	261
	262	imxpd->panel = of_drm_find_panel(remote);
	263	if (imxpd->panel) {
	264	dev_dbg(dev, "found panel %s\n", remote->full_name);
	265	} else {
	266	imxpd->bridge = of_drm_find_bridge(remote);
	267	if (imxpd->bridge)
	268	dev_dbg(dev, "found bridge %s\n",
	269	remote->full_name);
	270	}
	271	if (!imxpd->panel && !imxpd->bridge) {
	272	dev_dbg(dev, "waiting for panel or bridge %s\n",
	273	remote->full_name);
	274	of_node_put(remote);
	275	return -EPROBE_DEFER;
	276	}
	277	of_node_put(remote);
	278	}
	279
	280	imxpd->dev = dev;
	281
	282	ret = imx_pd_register(drm, imxpd);
	283	if (ret)
	284	return ret;
	285
	286	dev_set_drvdata(dev, imxpd);
	287
	288	return 0;
	289	}
	290
	291	static void imx_pd_unbind(struct device dev, struct device master,
	292	void *data)
	293	{
	294	struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
	295
	296	imxpd->encoder.funcs->destroy(&imxpd->encoder);
	297	imxpd->connector.funcs->destroy(&imxpd->connector);
	298
	299	kfree(imxpd->edid);
	300	}
	301
	302	static const struct component_ops imx_pd_ops = {
	303	.bind = imx_pd_bind,
	304	.unbind = imx_pd_unbind,
	305	};
	306
	307	static int imx_pd_probe(struct platform_device *pdev)
	308	{
	309	return component_add(&pdev->dev, &imx_pd_ops);
	310	}
	311
	312	static int imx_pd_remove(struct platform_device *pdev)
	313	{
	314	component_del(&pdev->dev, &imx_pd_ops);
	315
	316	return 0;
	317	}
	318
	319	static const struct of_device_id imx_pd_dt_ids[] = {
	320	{ .compatible = "fsl,imx-parallel-display", },
	321	{ /* sentinel */ }
	322	};
	323	MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
	324
	325	static struct platform_driver imx_pd_driver = {
	326	.probe = imx_pd_probe,
	327	.remove = imx_pd_remove,
	328	.driver = {
	329	.of_match_table = imx_pd_dt_ids,
	330	.name = "imx-parallel-display",
	331	},
	332	};
	333
	334	module_platform_driver(imx_pd_driver);
	335
	336	MODULE_DESCRIPTION("i.MX parallel display driver");
	337	MODULE_AUTHOR("Sascha Hauer, Pengutronix");
	338	MODULE_LICENSE("GPL");
	339	MODULE_ALIAS("platform:imx-parallel-display");