1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (C) 2015 Texas Instruments
  4 * Author: Jyri Sarha <jsarha@ti.com>
  5 */
  6
  7#include <linux/component.h>
  8#include <linux/of_graph.h>
  9
 10#include <drm/drm_atomic_helper.h>
 11#include <drm/drm_of.h>
 12
 13#include "tilcdc_drv.h"
 14#include "tilcdc_external.h"
 15
 16static const struct tilcdc_panel_info panel_info_tda998x = {
 17		.ac_bias                = 255,
 18		.ac_bias_intrpt         = 0,
 19		.dma_burst_sz           = 16,
 20		.bpp                    = 16,
 21		.fdd                    = 0x80,
 22		.tft_alt_mode           = 0,
 23		.invert_pxl_clk		= 1,
 24		.sync_edge              = 1,
 25		.sync_ctrl              = 1,
 26		.raster_order           = 0,
 27};
 28
 29static const struct tilcdc_panel_info panel_info_default = {
 30		.ac_bias                = 255,
 31		.ac_bias_intrpt         = 0,
 32		.dma_burst_sz           = 16,
 33		.bpp                    = 16,
 34		.fdd                    = 0x80,
 35		.tft_alt_mode           = 0,
 36		.sync_edge              = 0,
 37		.sync_ctrl              = 1,
 38		.raster_order           = 0,
 39};
 40
 41static
 42struct drm_connector *tilcdc_encoder_find_connector(struct drm_device *ddev,
 43						    struct drm_encoder *encoder)
 44{
 45	struct drm_connector *connector;
 46
 47	list_for_each_entry(connector, &ddev->mode_config.connector_list, head) {
 48		if (drm_connector_has_possible_encoder(connector, encoder))
 49			return connector;
 50	}
 51
 52	dev_err(ddev->dev, "No connector found for %s encoder (id %d)\n",
 53		encoder->name, encoder->base.id);
 54
 55	return NULL;
 56}
 57
 58int tilcdc_add_component_encoder(struct drm_device *ddev)
 59{
 60	struct tilcdc_drm_private *priv = ddev->dev_private;
 61	struct drm_encoder *encoder;
 62
 63	list_for_each_entry(encoder, &ddev->mode_config.encoder_list, head)
 64		if (encoder->possible_crtcs & (1 << priv->crtc->index))
 65			break;
 66
 67	if (!encoder) {
 68		dev_err(ddev->dev, "%s: No suitable encoder found\n", __func__);
 69		return -ENODEV;
 70	}
 71
 72	priv->external_connector =
 73		tilcdc_encoder_find_connector(ddev, encoder);
 74
 75	if (!priv->external_connector)
 76		return -ENODEV;
 77
 78	/* Only tda998x is supported at the moment. */
 79	tilcdc_crtc_set_simulate_vesa_sync(priv->crtc, true);
 80	tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_tda998x);
 81
 82	return 0;
 83}
 84
 85static const struct drm_encoder_funcs tilcdc_external_encoder_funcs = {
 86	.destroy	= drm_encoder_cleanup,
 87};
 88
 89static
 90int tilcdc_attach_bridge(struct drm_device *ddev, struct drm_bridge *bridge)
 91{
 92	struct tilcdc_drm_private *priv = ddev->dev_private;
 93	int ret;
 94
 95	priv->external_encoder->possible_crtcs = BIT(0);
 96
 97	ret = drm_bridge_attach(priv->external_encoder, bridge, NULL);
 98	if (ret) {
 99		dev_err(ddev->dev, "drm_bridge_attach() failed %d\n", ret);
100		return ret;
101	}
102
103	tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_default);
104
105	priv->external_connector =
106		tilcdc_encoder_find_connector(ddev, priv->external_encoder);
107	if (!priv->external_connector)
108		return -ENODEV;
109
110	return 0;
111}
112
113int tilcdc_attach_external_device(struct drm_device *ddev)
114{
115	struct tilcdc_drm_private *priv = ddev->dev_private;
116	struct drm_bridge *bridge;
117	struct drm_panel *panel;
118	int ret;
119
120	ret = drm_of_find_panel_or_bridge(ddev->dev->of_node, 0, 0,
121					  &panel, &bridge);
122	if (ret == -ENODEV)
123		return 0;
124	else if (ret)
125		return ret;
126
127	priv->external_encoder = devm_kzalloc(ddev->dev,
128					      sizeof(*priv->external_encoder),
129					      GFP_KERNEL);
130	if (!priv->external_encoder)
131		return -ENOMEM;
132
133	ret = drm_encoder_init(ddev, priv->external_encoder,
134			       &tilcdc_external_encoder_funcs,
135			       DRM_MODE_ENCODER_NONE, NULL);
136	if (ret) {
137		dev_err(ddev->dev, "drm_encoder_init() failed %d\n", ret);
138		return ret;
139	}
140
141	if (panel) {
142		bridge = devm_drm_panel_bridge_add(ddev->dev, panel,
143						   DRM_MODE_CONNECTOR_DPI);
144		if (IS_ERR(bridge)) {
145			ret = PTR_ERR(bridge);
146			goto err_encoder_cleanup;
147		}
148	}
149
150	ret = tilcdc_attach_bridge(ddev, bridge);
151	if (ret)
152		goto err_encoder_cleanup;
153
154	return 0;
155
156err_encoder_cleanup:
157	drm_encoder_cleanup(priv->external_encoder);
158	return ret;
159}
160
161static int dev_match_of(struct device *dev, void *data)
162{
163	return dev->of_node == data;
164}
165
166int tilcdc_get_external_components(struct device *dev,
167				   struct component_match **match)
168{
169	struct device_node *node;
170
171	node = of_graph_get_remote_node(dev->of_node, 0, 0);
172
173	if (!of_device_is_compatible(node, "nxp,tda998x")) {
174		of_node_put(node);
175		return 0;
176	}
177
178	if (match)
179		drm_of_component_match_add(dev, match, dev_match_of, node);
180	of_node_put(node);
181	return 1;
182}