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/of_graph.h>
 10
 11#include <drm/drm_atomic_helper.h>
 12#include <drm/drm_dp_helper.h>
 13#include <drm/drm_of.h>
 14#include <drm/drm_panel.h>
 15#include <drm/drm_probe_helper.h>
 16
 17#include "rockchip_drm_drv.h"
 18#include "rockchip_drm_vop.h"
 19
 20#define encoder_to_rgb(c) container_of(c, struct rockchip_rgb, encoder)
 21
 22struct rockchip_rgb {
 23	struct device *dev;
 24	struct drm_device *drm_dev;
 25	struct drm_bridge *bridge;
 26	struct drm_encoder encoder;
 27	int output_mode;
 28};
 29
 30static int
 31rockchip_rgb_encoder_atomic_check(struct drm_encoder *encoder,
 32				   struct drm_crtc_state *crtc_state,
 33				   struct drm_connector_state *conn_state)
 34{
 35	struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
 36	struct drm_connector *connector = conn_state->connector;
 37	struct drm_display_info *info = &connector->display_info;
 38	u32 bus_format;
 39
 40	if (info->num_bus_formats)
 41		bus_format = info->bus_formats[0];
 42	else
 43		bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 44
 45	switch (bus_format) {
 46	case MEDIA_BUS_FMT_RGB666_1X18:
 47		s->output_mode = ROCKCHIP_OUT_MODE_P666;
 48		break;
 49	case MEDIA_BUS_FMT_RGB565_1X16:
 50		s->output_mode = ROCKCHIP_OUT_MODE_P565;
 51		break;
 52	case MEDIA_BUS_FMT_RGB888_1X24:
 53	case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
 54	default:
 55		s->output_mode = ROCKCHIP_OUT_MODE_P888;
 56		break;
 57	}
 58
 59	s->output_type = DRM_MODE_CONNECTOR_LVDS;
 60
 61	return 0;
 62}
 63
 64static const
 65struct drm_encoder_helper_funcs rockchip_rgb_encoder_helper_funcs = {
 66	.atomic_check = rockchip_rgb_encoder_atomic_check,
 67};
 68
 69static const struct drm_encoder_funcs rockchip_rgb_encoder_funcs = {
 70	.destroy = drm_encoder_cleanup,
 71};
 72
 73struct rockchip_rgb *rockchip_rgb_init(struct device *dev,
 74				       struct drm_crtc *crtc,
 75				       struct drm_device *drm_dev)
 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
 85	rgb = devm_kzalloc(dev, sizeof(*rgb), GFP_KERNEL);
 86	if (!rgb)
 87		return ERR_PTR(-ENOMEM);
 88
 89	rgb->dev = dev;
 90	rgb->drm_dev = drm_dev;
 91
 92	port = of_graph_get_port_by_id(dev->of_node, 0);
 93	if (!port)
 94		return ERR_PTR(-EINVAL);
 95
 96	for_each_child_of_node(port, endpoint) {
 97		if (of_property_read_u32(endpoint, "reg", &endpoint_id))
 98			endpoint_id = 0;
 99
100		if (rockchip_drm_endpoint_is_subdriver(endpoint) > 0)
101			continue;
102
103		child_count++;
104		ret = drm_of_find_panel_or_bridge(dev->of_node, 0, endpoint_id,
105						  &panel, &bridge);
106		if (!ret) {
107			of_node_put(endpoint);
108			break;
109		}
110	}
111
112	of_node_put(port);
113
114	/* if the rgb output is not connected to anything, just return */
115	if (!child_count)
116		return NULL;
117
118	if (ret < 0) {
119		if (ret != -EPROBE_DEFER)
120			DRM_DEV_ERROR(dev, "failed to find panel or bridge %d\n", ret);
121		return ERR_PTR(ret);
122	}
123
124	encoder = &rgb->encoder;
125	encoder->possible_crtcs = drm_crtc_mask(crtc);
126
127	ret = drm_encoder_init(drm_dev, encoder, &rockchip_rgb_encoder_funcs,
128			       DRM_MODE_ENCODER_NONE, NULL);
129	if (ret < 0) {
130		DRM_DEV_ERROR(drm_dev->dev,
131			      "failed to initialize encoder: %d\n", ret);
132		return ERR_PTR(ret);
133	}
134
135	drm_encoder_helper_add(encoder, &rockchip_rgb_encoder_helper_funcs);
136
137	if (panel) {
138		bridge = drm_panel_bridge_add(panel, DRM_MODE_CONNECTOR_LVDS);
139		if (IS_ERR(bridge))
140			return ERR_CAST(bridge);
141	}
142
143	rgb->bridge = bridge;
144
145	ret = drm_bridge_attach(encoder, rgb->bridge, NULL);
146	if (ret) {
147		DRM_DEV_ERROR(drm_dev->dev,
148			      "failed to attach bridge: %d\n", ret);
149		goto err_free_encoder;
150	}
151
152	return rgb;
153
154err_free_encoder:
155	drm_encoder_cleanup(encoder);
156	return ERR_PTR(ret);
157}
158EXPORT_SYMBOL_GPL(rockchip_rgb_init);
159
160void rockchip_rgb_fini(struct rockchip_rgb *rgb)
161{
162	drm_panel_bridge_remove(rgb->bridge);
163	drm_encoder_cleanup(&rgb->encoder);
164}
165EXPORT_SYMBOL_GPL(rockchip_rgb_fini);