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_drm_vop.h"
 23#include "rockchip_rgb.h"
 24
 25#define encoder_to_rgb(c) container_of(c, struct rockchip_rgb, encoder)
 26
 27struct rockchip_rgb {
 28	struct device *dev;
 29	struct drm_device *drm_dev;
 30	struct drm_bridge *bridge;
 31	struct drm_encoder encoder;
 32	struct drm_connector connector;
 33	int output_mode;
 34};
 35
 36static int
 37rockchip_rgb_encoder_atomic_check(struct drm_encoder *encoder,
 38				   struct drm_crtc_state *crtc_state,
 39				   struct drm_connector_state *conn_state)
 40{
 41	struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
 42	struct drm_connector *connector = conn_state->connector;
 43	struct drm_display_info *info = &connector->display_info;
 44	u32 bus_format;
 45
 46	if (info->num_bus_formats)
 47		bus_format = info->bus_formats[0];
 48	else
 49		bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 50
 51	switch (bus_format) {
 52	case MEDIA_BUS_FMT_RGB666_1X18:
 53		s->output_mode = ROCKCHIP_OUT_MODE_P666;
 54		break;
 55	case MEDIA_BUS_FMT_RGB565_1X16:
 56		s->output_mode = ROCKCHIP_OUT_MODE_P565;
 57		break;
 58	case MEDIA_BUS_FMT_RGB888_1X24:
 59	case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
 60	default:
 61		s->output_mode = ROCKCHIP_OUT_MODE_P888;
 62		break;
 63	}
 64
 65	s->output_type = DRM_MODE_CONNECTOR_LVDS;
 66
 67	return 0;
 68}
 69
 70static const
 71struct drm_encoder_helper_funcs rockchip_rgb_encoder_helper_funcs = {
 72	.atomic_check = rockchip_rgb_encoder_atomic_check,
 73};
 74
 75struct rockchip_rgb *rockchip_rgb_init(struct device *dev,
 76				       struct drm_crtc *crtc,
 77				       struct drm_device *drm_dev)
 78{
 79	struct rockchip_rgb *rgb;
 80	struct drm_encoder *encoder;
 81	struct device_node *port, *endpoint;
 82	u32 endpoint_id;
 83	int ret = 0, child_count = 0;
 84	struct drm_panel *panel;
 85	struct drm_bridge *bridge;
 86	struct drm_connector *connector;
 87
 88	rgb = devm_kzalloc(dev, sizeof(*rgb), GFP_KERNEL);
 89	if (!rgb)
 90		return ERR_PTR(-ENOMEM);
 91
 92	rgb->dev = dev;
 93	rgb->drm_dev = drm_dev;
 94
 95	port = of_graph_get_port_by_id(dev->of_node, 0);
 96	if (!port)
 97		return ERR_PTR(-EINVAL);
 98
 99	for_each_child_of_node(port, endpoint) {
100		if (of_property_read_u32(endpoint, "reg", &endpoint_id))
101			endpoint_id = 0;
102
103		/* if subdriver (> 0) or error case (< 0), ignore entry */
104		if (rockchip_drm_endpoint_is_subdriver(endpoint) != 0)
105			continue;
106
107		child_count++;
108		ret = drm_of_find_panel_or_bridge(dev->of_node, 0, endpoint_id,
109						  &panel, &bridge);
110		if (!ret) {
111			of_node_put(endpoint);
112			break;
113		}
114	}
115
116	of_node_put(port);
117
118	/* if the rgb output is not connected to anything, just return */
119	if (!child_count)
120		return NULL;
121
122	if (ret < 0) {
123		if (ret != -EPROBE_DEFER)
124			DRM_DEV_ERROR(dev, "failed to find panel or bridge %d\n", ret);
125		return ERR_PTR(ret);
126	}
127
128	encoder = &rgb->encoder;
129	encoder->possible_crtcs = drm_crtc_mask(crtc);
130
131	ret = drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_NONE);
132	if (ret < 0) {
133		DRM_DEV_ERROR(drm_dev->dev,
134			      "failed to initialize encoder: %d\n", ret);
135		return ERR_PTR(ret);
136	}
137
138	drm_encoder_helper_add(encoder, &rockchip_rgb_encoder_helper_funcs);
139
140	if (panel) {
141		bridge = drm_panel_bridge_add_typed(panel,
142						    DRM_MODE_CONNECTOR_LVDS);
143		if (IS_ERR(bridge))
144			return ERR_CAST(bridge);
145	}
146
147	rgb->bridge = bridge;
148
149	ret = drm_bridge_attach(encoder, rgb->bridge, NULL,
150				DRM_BRIDGE_ATTACH_NO_CONNECTOR);
151	if (ret)
152		goto err_free_encoder;
153
154	connector = &rgb->connector;
155	connector = drm_bridge_connector_init(rgb->drm_dev, encoder);
156	if (IS_ERR(connector)) {
157		DRM_DEV_ERROR(drm_dev->dev,
158			      "failed to initialize bridge connector: %pe\n",
159			      connector);
160		ret = PTR_ERR(connector);
161		goto err_free_encoder;
162	}
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);
186}
187EXPORT_SYMBOL_GPL(rockchip_rgb_fini);