1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
  4 * Author:
  5 *      Sandy Huang <hjc@rock-chips.com>
  6 */
  7
  8#include <linux/component.h>
  9#include <linux/media-bus-format.h>
 10#include <linux/of_graph.h>
 11
 12#include <drm/display/drm_dp_helper.h>
 13#include <drm/drm_atomic_helper.h>
 14#include <drm/drm_bridge.h>
 15#include <drm/drm_bridge_connector.h>
 16#include <drm/drm_of.h>
 17#include <drm/drm_panel.h>
 18#include <drm/drm_probe_helper.h>
 19#include <drm/drm_simple_kms_helper.h>
 20
 21#include "rockchip_drm_drv.h"
 22#include "rockchip_rgb.h"
 23
 24struct rockchip_rgb {
 25	struct device *dev;
 26	struct drm_device *drm_dev;
 27	struct drm_bridge *bridge;
 28	struct rockchip_encoder encoder;
 29	struct drm_connector connector;
 30	int output_mode;
 31};
 32
 33static int
 34rockchip_rgb_encoder_atomic_check(struct drm_encoder *encoder,
 35				   struct drm_crtc_state *crtc_state,
 36				   struct drm_connector_state *conn_state)
 37{
 38	struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
 39	struct drm_connector *connector = conn_state->connector;
 40	struct drm_display_info *info = &connector->display_info;
 41	u32 bus_format;
 42
 43	if (info->num_bus_formats)
 44		bus_format = info->bus_formats[0];
 45	else
 46		bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 47
 48	switch (bus_format) {
 49	case MEDIA_BUS_FMT_RGB666_1X18:
 50		s->output_mode = ROCKCHIP_OUT_MODE_P666;
 51		break;
 52	case MEDIA_BUS_FMT_RGB565_1X16:
 53		s->output_mode = ROCKCHIP_OUT_MODE_P565;
 54		break;
 55	case MEDIA_BUS_FMT_RGB888_1X24:
 56	case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
 57	default:
 58		s->output_mode = ROCKCHIP_OUT_MODE_P888;
 59		break;
 60	}
 61
 62	s->output_type = DRM_MODE_CONNECTOR_LVDS;
 63
 64	return 0;
 65}
 66
 67static const
 68struct drm_encoder_helper_funcs rockchip_rgb_encoder_helper_funcs = {
 69	.atomic_check = rockchip_rgb_encoder_atomic_check,
 70};
 71
 72struct rockchip_rgb *rockchip_rgb_init(struct device *dev,
 73				       struct drm_crtc *crtc,
 74				       struct drm_device *drm_dev,
 75				       int video_port)
 76{
 77	struct rockchip_rgb *rgb;
 78	struct drm_encoder *encoder;
 79	struct device_node *port, *endpoint;
 80	u32 endpoint_id;
 81	int ret = 0, child_count = 0;
 82	struct drm_panel *panel;
 83	struct drm_bridge *bridge;
 84	struct drm_connector *connector;
 85
 86	rgb = devm_kzalloc(dev, sizeof(*rgb), GFP_KERNEL);
 87	if (!rgb)
 88		return ERR_PTR(-ENOMEM);
 89
 90	rgb->dev = dev;
 91	rgb->drm_dev = drm_dev;
 92
 93	port = of_graph_get_port_by_id(dev->of_node, video_port);
 94	if (!port)
 95		return ERR_PTR(-EINVAL);
 96
 97	for_each_child_of_node(port, endpoint) {
 98		if (of_property_read_u32(endpoint, "reg", &endpoint_id))
 99			endpoint_id = 0;
100
101		/* if subdriver (> 0) or error case (< 0), ignore entry */
102		if (rockchip_drm_endpoint_is_subdriver(endpoint) != 0)
103			continue;
104
105		child_count++;
106		ret = drm_of_find_panel_or_bridge(dev->of_node, video_port,
107						  endpoint_id, &panel, &bridge);
108		if (!ret) {
109			of_node_put(endpoint);
110			break;
111		}
112	}
113
114	of_node_put(port);
115
116	/* if the rgb output is not connected to anything, just return */
117	if (!child_count)
118		return NULL;
119
120	if (ret < 0) {
121		if (ret != -EPROBE_DEFER)
122			DRM_DEV_ERROR(dev, "failed to find panel or bridge %d\n", ret);
123		return ERR_PTR(ret);
124	}
125
126	encoder = &rgb->encoder.encoder;
127	encoder->possible_crtcs = drm_crtc_mask(crtc);
128
129	ret = drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_NONE);
130	if (ret < 0) {
131		DRM_DEV_ERROR(drm_dev->dev,
132			      "failed to initialize encoder: %d\n", ret);
133		return ERR_PTR(ret);
134	}
135
136	drm_encoder_helper_add(encoder, &rockchip_rgb_encoder_helper_funcs);
137
138	if (panel) {
139		bridge = drm_panel_bridge_add_typed(panel,
140						    DRM_MODE_CONNECTOR_LVDS);
141		if (IS_ERR(bridge))
142			return ERR_CAST(bridge);
143	}
144
145	rgb->bridge = bridge;
146
147	ret = drm_bridge_attach(encoder, rgb->bridge, NULL,
148				DRM_BRIDGE_ATTACH_NO_CONNECTOR);
149	if (ret)
150		goto err_free_encoder;
151
152	connector = &rgb->connector;
153	connector = drm_bridge_connector_init(rgb->drm_dev, encoder);
154	if (IS_ERR(connector)) {
155		DRM_DEV_ERROR(drm_dev->dev,
156			      "failed to initialize bridge connector: %pe\n",
157			      connector);
158		ret = PTR_ERR(connector);
159		goto err_free_encoder;
160	}
161
162	rgb->encoder.crtc_endpoint_id = endpoint_id;
163
164	ret = drm_connector_attach_encoder(connector, encoder);
165	if (ret < 0) {
166		DRM_DEV_ERROR(drm_dev->dev,
167			      "failed to attach encoder: %d\n", ret);
168		goto err_free_connector;
169	}
170
171	return rgb;
172
173err_free_connector:
174	drm_connector_cleanup(connector);
175err_free_encoder:
176	drm_encoder_cleanup(encoder);
177	return ERR_PTR(ret);
178}
179EXPORT_SYMBOL_GPL(rockchip_rgb_init);
180
181void rockchip_rgb_fini(struct rockchip_rgb *rgb)
182{
183	drm_panel_bridge_remove(rgb->bridge);
184	drm_connector_cleanup(&rgb->connector);
185	drm_encoder_cleanup(&rgb->encoder.encoder);
186}
187EXPORT_SYMBOL_GPL(rockchip_rgb_fini);