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_bridge.h>
 13#include <drm/drm_dp_helper.h>
 14#include <drm/drm_of.h>
 15#include <drm/drm_panel.h>
 16#include <drm/drm_probe_helper.h>
 17#include <drm/drm_simple_kms_helper.h>
 18
 19#include "rockchip_drm_drv.h"
 20#include "rockchip_drm_vop.h"
 21
 22#define encoder_to_rgb(c) container_of(c, struct rockchip_rgb, encoder)
 23
 24struct rockchip_rgb {
 25	struct device *dev;
 26	struct drm_device *drm_dev;
 27	struct drm_bridge *bridge;
 28	struct drm_encoder encoder;
 29	int output_mode;
 30};
 31
 32static int
 33rockchip_rgb_encoder_atomic_check(struct drm_encoder *encoder,
 34				   struct drm_crtc_state *crtc_state,
 35				   struct drm_connector_state *conn_state)
 36{
 37	struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
 38	struct drm_connector *connector = conn_state->connector;
 39	struct drm_display_info *info = &connector->display_info;
 40	u32 bus_format;
 41
 42	if (info->num_bus_formats)
 43		bus_format = info->bus_formats[0];
 44	else
 45		bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 46
 47	switch (bus_format) {
 48	case MEDIA_BUS_FMT_RGB666_1X18:
 49		s->output_mode = ROCKCHIP_OUT_MODE_P666;
 50		break;
 51	case MEDIA_BUS_FMT_RGB565_1X16:
 52		s->output_mode = ROCKCHIP_OUT_MODE_P565;
 53		break;
 54	case MEDIA_BUS_FMT_RGB888_1X24:
 55	case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
 56	default:
 57		s->output_mode = ROCKCHIP_OUT_MODE_P888;
 58		break;
 59	}
 60
 61	s->output_type = DRM_MODE_CONNECTOR_LVDS;
 62
 63	return 0;
 64}
 65
 66static const
 67struct drm_encoder_helper_funcs rockchip_rgb_encoder_helper_funcs = {
 68	.atomic_check = rockchip_rgb_encoder_atomic_check,
 69};
 70
 71struct rockchip_rgb *rockchip_rgb_init(struct device *dev,
 72				       struct drm_crtc *crtc,
 73				       struct drm_device *drm_dev)
 74{
 75	struct rockchip_rgb *rgb;
 76	struct drm_encoder *encoder;
 77	struct device_node *port, *endpoint;
 78	u32 endpoint_id;
 79	int ret = 0, child_count = 0;
 80	struct drm_panel *panel;
 81	struct drm_bridge *bridge;
 82
 83	rgb = devm_kzalloc(dev, sizeof(*rgb), GFP_KERNEL);
 84	if (!rgb)
 85		return ERR_PTR(-ENOMEM);
 86
 87	rgb->dev = dev;
 88	rgb->drm_dev = drm_dev;
 89
 90	port = of_graph_get_port_by_id(dev->of_node, 0);
 91	if (!port)
 92		return ERR_PTR(-EINVAL);
 93
 94	for_each_child_of_node(port, endpoint) {
 95		if (of_property_read_u32(endpoint, "reg", &endpoint_id))
 96			endpoint_id = 0;
 97
 98		/* if subdriver (> 0) or error case (< 0), ignore entry */
 99		if (rockchip_drm_endpoint_is_subdriver(endpoint) != 0)
100			continue;
101
102		child_count++;
103		ret = drm_of_find_panel_or_bridge(dev->of_node, 0, endpoint_id,
104						  &panel, &bridge);
105		if (!ret) {
106			of_node_put(endpoint);
107			break;
108		}
109	}
110
111	of_node_put(port);
112
113	/* if the rgb output is not connected to anything, just return */
114	if (!child_count)
115		return NULL;
116
117	if (ret < 0) {
118		if (ret != -EPROBE_DEFER)
119			DRM_DEV_ERROR(dev, "failed to find panel or bridge %d\n", ret);
120		return ERR_PTR(ret);
121	}
122
123	encoder = &rgb->encoder;
124	encoder->possible_crtcs = drm_crtc_mask(crtc);
125
126	ret = drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_NONE);
127	if (ret < 0) {
128		DRM_DEV_ERROR(drm_dev->dev,
129			      "failed to initialize encoder: %d\n", ret);
130		return ERR_PTR(ret);
131	}
132
133	drm_encoder_helper_add(encoder, &rockchip_rgb_encoder_helper_funcs);
134
135	if (panel) {
136		bridge = drm_panel_bridge_add_typed(panel,
137						    DRM_MODE_CONNECTOR_LVDS);
138		if (IS_ERR(bridge))
139			return ERR_CAST(bridge);
140	}
141
142	rgb->bridge = bridge;
143
144	ret = drm_bridge_attach(encoder, rgb->bridge, NULL, 0);
145	if (ret) {
146		DRM_DEV_ERROR(drm_dev->dev,
147			      "failed to attach bridge: %d\n", ret);
148		goto err_free_encoder;
149	}
150
151	return rgb;
152
153err_free_encoder:
154	drm_encoder_cleanup(encoder);
155	return ERR_PTR(ret);
156}
157EXPORT_SYMBOL_GPL(rockchip_rgb_init);
158
159void rockchip_rgb_fini(struct rockchip_rgb *rgb)
160{
161	drm_panel_bridge_remove(rgb->bridge);
162	drm_encoder_cleanup(&rgb->encoder);
163}
164EXPORT_SYMBOL_GPL(rockchip_rgb_fini);