[linux-2.6-block.git] / drivers / gpu / drm / tilcdc / tilcdc_external.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2015 Texas Instruments
 * Author: Jyri Sarha <jsarha@ti.com>
 */

#include <linux/component.h>
#include <linux/of_graph.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_of.h>

#include "tilcdc_drv.h"
#include "tilcdc_external.h"

static const struct tilcdc_panel_info panel_info_tda998x = {
		.ac_bias                = 255,
		.ac_bias_intrpt         = 0,
		.dma_burst_sz           = 16,
		.bpp                    = 16,
		.fdd                    = 0x80,
		.tft_alt_mode           = 0,
		.invert_pxl_clk		= 1,
		.sync_edge              = 1,
		.sync_ctrl              = 1,
		.raster_order           = 0,
};

static const struct tilcdc_panel_info panel_info_default = {
		.ac_bias                = 255,
		.ac_bias_intrpt         = 0,
		.dma_burst_sz           = 16,
		.bpp                    = 16,
		.fdd                    = 0x80,
		.tft_alt_mode           = 0,
		.sync_edge              = 0,
		.sync_ctrl              = 1,
		.raster_order           = 0,
};

static int tilcdc_external_mode_valid(struct drm_connector *connector,
				      struct drm_display_mode *mode)
{
	struct tilcdc_drm_private *priv = connector->dev->dev_private;
	int ret;

	ret = tilcdc_crtc_mode_valid(priv->crtc, mode);
	if (ret != MODE_OK)
		return ret;

	BUG_ON(priv->external_connector != connector);
	BUG_ON(!priv->connector_funcs);

	/* If the connector has its own mode_valid call it. */
	if (!IS_ERR(priv->connector_funcs) &&
	    priv->connector_funcs->mode_valid)
		return priv->connector_funcs->mode_valid(connector, mode);

	return MODE_OK;
}

static int tilcdc_add_external_connector(struct drm_device *dev,
					 struct drm_connector *connector)
{
	struct tilcdc_drm_private *priv = dev->dev_private;
	struct drm_connector_helper_funcs *connector_funcs;

	/* There should never be more than one connector */
	if (WARN_ON(priv->external_connector))
		return -EINVAL;

	priv->external_connector = connector;
	connector_funcs = devm_kzalloc(dev->dev, sizeof(*connector_funcs),
				       GFP_KERNEL);
	if (!connector_funcs)
		return -ENOMEM;

	/* connector->helper_private contains always struct
	 * connector_helper_funcs pointer. For tilcdc crtc to have a
	 * say if a specific mode is Ok, we need to install our own
	 * helper functions. In our helper functions we copy
	 * everything else but use our own mode_valid() (above).
	 */
	if (connector->helper_private) {
		priv->connector_funcs =	connector->helper_private;
		*connector_funcs = *priv->connector_funcs;
	} else {
		priv->connector_funcs = ERR_PTR(-ENOENT);
	}
	connector_funcs->mode_valid = tilcdc_external_mode_valid;
	drm_connector_helper_add(connector, connector_funcs);

	dev_dbg(dev->dev, "External connector '%s' connected\n",
		connector->name);

	return 0;
}

static
struct drm_connector *tilcdc_encoder_find_connector(struct drm_device *ddev,
						    struct drm_encoder *encoder)
{
	struct drm_connector *connector;

	list_for_each_entry(connector, &ddev->mode_config.connector_list, head) {
		if (drm_connector_has_possible_encoder(connector, encoder))
			return connector;
	}

	dev_err(ddev->dev, "No connector found for %s encoder (id %d)\n",
		encoder->name, encoder->base.id);

	return NULL;
}

int tilcdc_add_component_encoder(struct drm_device *ddev)
{
	struct tilcdc_drm_private *priv = ddev->dev_private;
	struct drm_connector *connector;
	struct drm_encoder *encoder;

	list_for_each_entry(encoder, &ddev->mode_config.encoder_list, head)
		if (encoder->possible_crtcs & (1 << priv->crtc->index))
			break;

	if (!encoder) {
		dev_err(ddev->dev, "%s: No suitable encoder found\n", __func__);
		return -ENODEV;
	}

	connector = tilcdc_encoder_find_connector(ddev, encoder);

	if (!connector)
		return -ENODEV;

	/* Only tda998x is supported at the moment. */
	tilcdc_crtc_set_simulate_vesa_sync(priv->crtc, true);
	tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_tda998x);

	return tilcdc_add_external_connector(ddev, connector);
}

void tilcdc_remove_external_device(struct drm_device *dev)
{
	struct tilcdc_drm_private *priv = dev->dev_private;

	/* Restore the original helper functions, if any. */
	if (IS_ERR(priv->connector_funcs))
		drm_connector_helper_add(priv->external_connector, NULL);
	else if (priv->connector_funcs)
		drm_connector_helper_add(priv->external_connector,
					 priv->connector_funcs);
}

static const struct drm_encoder_funcs tilcdc_external_encoder_funcs = {
	.destroy	= drm_encoder_cleanup,
};

static
int tilcdc_attach_bridge(struct drm_device *ddev, struct drm_bridge *bridge)
{
	struct tilcdc_drm_private *priv = ddev->dev_private;
	struct drm_connector *connector;
	int ret;

	priv->external_encoder->possible_crtcs = BIT(0);

	ret = drm_bridge_attach(priv->external_encoder, bridge, NULL);
	if (ret) {
		dev_err(ddev->dev, "drm_bridge_attach() failed %d\n", ret);
		return ret;
	}

	tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_default);

	connector = tilcdc_encoder_find_connector(ddev, priv->external_encoder);
	if (!connector)
		return -ENODEV;

	ret = tilcdc_add_external_connector(ddev, connector);

	return ret;
}

int tilcdc_attach_external_device(struct drm_device *ddev)
{
	struct tilcdc_drm_private *priv = ddev->dev_private;
	struct drm_bridge *bridge;
	struct drm_panel *panel;
	int ret;

	ret = drm_of_find_panel_or_bridge(ddev->dev->of_node, 0, 0,
					  &panel, &bridge);
	if (ret == -ENODEV)
		return 0;
	else if (ret)
		return ret;

	priv->external_encoder = devm_kzalloc(ddev->dev,
					      sizeof(*priv->external_encoder),
					      GFP_KERNEL);
	if (!priv->external_encoder)
		return -ENOMEM;

	ret = drm_encoder_init(ddev, priv->external_encoder,
			       &tilcdc_external_encoder_funcs,
			       DRM_MODE_ENCODER_NONE, NULL);
	if (ret) {
		dev_err(ddev->dev, "drm_encoder_init() failed %d\n", ret);
		return ret;
	}

	if (panel) {
		bridge = devm_drm_panel_bridge_add(ddev->dev, panel,
						   DRM_MODE_CONNECTOR_DPI);
		if (IS_ERR(bridge)) {
			ret = PTR_ERR(bridge);
			goto err_encoder_cleanup;
		}
	}

	ret = tilcdc_attach_bridge(ddev, bridge);
	if (ret)
		goto err_encoder_cleanup;

	return 0;

err_encoder_cleanup:
	drm_encoder_cleanup(priv->external_encoder);
	return ret;
}

static int dev_match_of(struct device *dev, void *data)
{
	return dev->of_node == data;
}

int tilcdc_get_external_components(struct device *dev,
				   struct component_match **match)
{
	struct device_node *node;

	node = of_graph_get_remote_node(dev->of_node, 0, 0);

	if (!of_device_is_compatible(node, "nxp,tda998x")) {
		of_node_put(node);
		return 0;
	}

	if (match)
		drm_of_component_match_add(dev, match, dev_match_of, node);
	of_node_put(node);
	return 1;
}
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
103cd8bc JS	2	/*
	3	* Copyright (C) 2015 Texas Instruments
	4	* Author: Jyri Sarha <jsarha@ti.com>
103cd8bc JS	5	*/
	6
	7	#include <linux/component.h>
	8	#include <linux/of_graph.h>
fcd70cd3	9	#include <drm/drm_atomic_helper.h>
97ac0e47	10	#include <drm/drm_of.h>
103cd8bc JS	11
	12	#include "tilcdc_drv.h"
	13	#include "tilcdc_external.h"
	14
	15	static const struct tilcdc_panel_info panel_info_tda998x = {
	16	.ac_bias = 255,
	17	.ac_bias_intrpt = 0,
	18	.dma_burst_sz = 16,
	19	.bpp = 16,
	20	.fdd = 0x80,
	21	.tft_alt_mode = 0,
	22	.invert_pxl_clk = 1,
	23	.sync_edge = 1,
	24	.sync_ctrl = 1,
	25	.raster_order = 0,
	26	};
	27
ec9eab09 JS	28	static const struct tilcdc_panel_info panel_info_default = {
	29	.ac_bias = 255,
	30	.ac_bias_intrpt = 0,
	31	.dma_burst_sz = 16,
	32	.bpp = 16,
	33	.fdd = 0x80,
	34	.tft_alt_mode = 0,
	35	.sync_edge = 0,
	36	.sync_ctrl = 1,
	37	.raster_order = 0,
	38	};
	39
103cd8bc JS	40	static int tilcdc_external_mode_valid(struct drm_connector *connector,
	41	struct drm_display_mode *mode)
	42	{
	43	struct tilcdc_drm_private *priv = connector->dev->dev_private;
ec9eab09	44	int ret;
103cd8bc JS	45
	46	ret = tilcdc_crtc_mode_valid(priv->crtc, mode);
	47	if (ret != MODE_OK)
	48	return ret;
	49
ec9eab09 JS	50	BUG_ON(priv->external_connector != connector);
ec9eab09 JS	51	BUG_ON(!priv->connector_funcs);
103cd8bc JS	52
103cd8bc JS	53	/* If the connector has its own mode_valid call it. */
ec9eab09 JS	54	if (!IS_ERR(priv->connector_funcs) &&
	55	priv->connector_funcs->mode_valid)
	56	return priv->connector_funcs->mode_valid(connector, mode);
103cd8bc JS	57
	58	return MODE_OK;
	59	}
	60
ec9eab09 JS	61	static int tilcdc_add_external_connector(struct drm_device *dev,
ec9eab09 JS	62	struct drm_connector *connector)
103cd8bc JS	63	{
	64	struct tilcdc_drm_private *priv = dev->dev_private;
	65	struct drm_connector_helper_funcs *connector_funcs;
	66
ec9eab09 JS	67	/* There should never be more than one connector */
	68	if (WARN_ON(priv->external_connector))
	69	return -EINVAL;
103cd8bc	70
ec9eab09	71	priv->external_connector = connector;
103cd8bc JS	72	connector_funcs = devm_kzalloc(dev->dev, sizeof(*connector_funcs),
	73	GFP_KERNEL);
	74	if (!connector_funcs)
	75	return -ENOMEM;
	76
	77	/* connector->helper_private contains always struct
	78	* connector_helper_funcs pointer. For tilcdc crtc to have a
	79	* say if a specific mode is Ok, we need to install our own
	80	* helper functions. In our helper functions we copy
	81	* everything else but use our own mode_valid() (above).
	82	*/
	83	if (connector->helper_private) {
ec9eab09 JS	84	priv->connector_funcs = connector->helper_private;
ec9eab09 JS	85	connector_funcs = priv->connector_funcs;
103cd8bc	86	} else {
ec9eab09	87	priv->connector_funcs = ERR_PTR(-ENOENT);
103cd8bc JS	88	}
	89	connector_funcs->mode_valid = tilcdc_external_mode_valid;
	90	drm_connector_helper_add(connector, connector_funcs);
103cd8bc	91
ec9eab09 JS	92	dev_dbg(dev->dev, "External connector '%s' connected\n",
ec9eab09 JS	93	connector->name);
103cd8bc JS	94
	95	return 0;
	96	}
	97
ec9eab09 JS	98	static
	99	struct drm_connector tilcdc_encoder_find_connector(struct drm_device ddev,
	100	struct drm_encoder *encoder)
103cd8bc	101	{
103cd8bc	102	struct drm_connector *connector;
ec9eab09	103
0b7510d1 VS	104	list_for_each_entry(connector, &ddev->mode_config.connector_list, head) {
	105	if (drm_connector_has_possible_encoder(connector, encoder))
	106	return connector;
	107	}
ec9eab09 JS	108
	109	dev_err(ddev->dev, "No connector found for %s encoder (id %d)\n",
	110	encoder->name, encoder->base.id);
	111
	112	return NULL;
	113	}
	114
	115	int tilcdc_add_component_encoder(struct drm_device *ddev)
	116	{
	117	struct tilcdc_drm_private *priv = ddev->dev_private;
	118	struct drm_connector *connector;
	119	struct drm_encoder *encoder;
	120
	121	list_for_each_entry(encoder, &ddev->mode_config.encoder_list, head)
	122	if (encoder->possible_crtcs & (1 << priv->crtc->index))
	123	break;
	124
	125	if (!encoder) {
	126	dev_err(ddev->dev, "%s: No suitable encoder found\n", __func__);
	127	return -ENODEV;
103cd8bc	128	}
ec9eab09 JS	129
	130	connector = tilcdc_encoder_find_connector(ddev, encoder);
	131
	132	if (!connector)
	133	return -ENODEV;
	134
	135	/* Only tda998x is supported at the moment. */
	136	tilcdc_crtc_set_simulate_vesa_sync(priv->crtc, true);
	137	tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_tda998x);
	138
	139	return tilcdc_add_external_connector(ddev, connector);
103cd8bc JS	140	}
103cd8bc JS	141
ec9eab09	142	void tilcdc_remove_external_device(struct drm_device *dev)
103cd8bc JS	143	{
103cd8bc JS	144	struct tilcdc_drm_private *priv = dev->dev_private;
103cd8bc JS	145
103cd8bc JS	146	/* Restore the original helper functions, if any. */
ec9eab09 JS	147	if (IS_ERR(priv->connector_funcs))
	148	drm_connector_helper_add(priv->external_connector, NULL);
	149	else if (priv->connector_funcs)
	150	drm_connector_helper_add(priv->external_connector,
	151	priv->connector_funcs);
	152	}
	153
	154	static const struct drm_encoder_funcs tilcdc_external_encoder_funcs = {
	155	.destroy = drm_encoder_cleanup,
	156	};
	157
	158	static
	159	int tilcdc_attach_bridge(struct drm_device ddev, struct drm_bridge bridge)
	160	{
	161	struct tilcdc_drm_private *priv = ddev->dev_private;
	162	struct drm_connector *connector;
	163	int ret;
	164
	165	priv->external_encoder->possible_crtcs = BIT(0);
ec9eab09	166
3bb80f24	167	ret = drm_bridge_attach(priv->external_encoder, bridge, NULL);
ec9eab09 JS	168	if (ret) {
	169	dev_err(ddev->dev, "drm_bridge_attach() failed %d\n", ret);
	170	return ret;
	171	}
	172
	173	tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_default);
	174
	175	connector = tilcdc_encoder_find_connector(ddev, priv->external_encoder);
	176	if (!connector)
	177	return -ENODEV;
	178
	179	ret = tilcdc_add_external_connector(ddev, connector);
	180
	181	return ret;
	182	}
	183
ec9eab09 JS	184	int tilcdc_attach_external_device(struct drm_device *ddev)
	185	{
	186	struct tilcdc_drm_private *priv = ddev->dev_private;
ec9eab09	187	struct drm_bridge *bridge;
544f7377	188	struct drm_panel *panel;
ec9eab09 JS	189	int ret;
ec9eab09 JS	190
544f7377 JS	191	ret = drm_of_find_panel_or_bridge(ddev->dev->of_node, 0, 0,
	192	&panel, &bridge);
	193	if (ret == -ENODEV)
ec9eab09	194	return 0;
544f7377 JS	195	else if (ret)
544f7377 JS	196	return ret;
ec9eab09 JS	197
	198	priv->external_encoder = devm_kzalloc(ddev->dev,
	199	sizeof(*priv->external_encoder),
	200	GFP_KERNEL);
	201	if (!priv->external_encoder)
	202	return -ENOMEM;
	203
	204	ret = drm_encoder_init(ddev, priv->external_encoder,
	205	&tilcdc_external_encoder_funcs,
	206	DRM_MODE_ENCODER_NONE, NULL);
	207	if (ret) {
	208	dev_err(ddev->dev, "drm_encoder_init() failed %d\n", ret);
	209	return ret;
	210	}
	211
544f7377 JS	212	if (panel) {
	213	bridge = devm_drm_panel_bridge_add(ddev->dev, panel,
	214	DRM_MODE_CONNECTOR_DPI);
	215	if (IS_ERR(bridge)) {
	216	ret = PTR_ERR(bridge);
	217	goto err_encoder_cleanup;
	218	}
	219	}
	220
ec9eab09 JS	221	ret = tilcdc_attach_bridge(ddev, bridge);
ec9eab09 JS	222	if (ret)
544f7377 JS	223	goto err_encoder_cleanup;
	224
	225	return 0;
ec9eab09	226
544f7377 JS	227	err_encoder_cleanup:
544f7377 JS	228	drm_encoder_cleanup(priv->external_encoder);
ec9eab09	229	return ret;
103cd8bc JS	230	}
	231
	232	static int dev_match_of(struct device dev, void data)
	233	{
	234	return dev->of_node == data;
	235	}
	236
	237	int tilcdc_get_external_components(struct device *dev,
	238	struct component_match **match)
	239	{
10a55a18	240	struct device_node *node;
103cd8bc	241
86418f90	242	node = of_graph_get_remote_node(dev->of_node, 0, 0);
ec9eab09	243
86418f90	244	if (!of_device_is_compatible(node, "nxp,tda998x")) {
ec9eab09	245	of_node_put(node);
86418f90	246	return 0;
103cd8bc JS	247	}
103cd8bc JS	248
86418f90 RH	249	if (match)
	250	drm_of_component_match_add(dev, match, dev_match_of, node);
	251	of_node_put(node);
	252	return 1;
103cd8bc	253	}