rockchip_rgb.c

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Copyright (C) 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_print.h>
 19#include <drm/drm_probe_helper.h>
 20#include <drm/drm_simple_kms_helper.h>
 21
 22#include "rockchip_drm_drv.h"
 23#include "rockchip_rgb.h"
 24
 25struct rockchip_rgb {
 26	struct device *dev;
 27	struct drm_device *drm_dev;
 28	struct drm_bridge *bridge;
 29	struct rockchip_encoder encoder;
 30	struct drm_connector connector;
 31	int output_mode;
 32};
 33
 34static int
 35rockchip_rgb_encoder_atomic_check(struct drm_encoder *encoder,
 36				   struct drm_crtc_state *crtc_state,
 37				   struct drm_connector_state *conn_state)
 38{
 39	struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
 40	struct drm_connector *connector = conn_state->connector;
 41	struct drm_display_info *info = &connector->display_info;
 42	u32 bus_format;
 43
 44	if (info->num_bus_formats)
 45		bus_format = info->bus_formats[0];
 46	else
 47		bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 48
 49	switch (bus_format) {
 50	case MEDIA_BUS_FMT_RGB666_1X18:
 51		s->output_mode = ROCKCHIP_OUT_MODE_P666;
 52		break;
 53	case MEDIA_BUS_FMT_RGB565_1X16:
 54		s->output_mode = ROCKCHIP_OUT_MODE_P565;
 55		break;
 56	case MEDIA_BUS_FMT_RGB888_1X24:
 57	case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
 58	default:
 59		s->output_mode = ROCKCHIP_OUT_MODE_P888;
 60		break;
 61	}
 62
 63	s->output_type = DRM_MODE_CONNECTOR_LVDS;
 64
 65	return 0;
 66}
 67
 68static const
 69struct drm_encoder_helper_funcs rockchip_rgb_encoder_helper_funcs = {
 70	.atomic_check = rockchip_rgb_encoder_atomic_check,
 71};
 72
 73struct rockchip_rgb *rockchip_rgb_init(struct device *dev,
 74				       struct drm_crtc *crtc,
 75				       struct drm_device *drm_dev,
 76				       int video_port)
 77{
 78	struct rockchip_rgb *rgb;
 79	struct drm_encoder *encoder;
 80	struct device_node *port, *endpoint;
 81	u32 endpoint_id;
 82	int ret = 0, child_count = 0;
 83	struct drm_panel *panel;
 84	struct drm_bridge *bridge;
 85	struct drm_connector *connector;
 86
 87	rgb = devm_kzalloc(dev, sizeof(*rgb), GFP_KERNEL);
 88	if (!rgb)
 89		return ERR_PTR(-ENOMEM);
 90
 91	rgb->dev = dev;
 92	rgb->drm_dev = drm_dev;
 93
 94	port = of_graph_get_port_by_id(dev->of_node, video_port);
 95	if (!port)
 96		return ERR_PTR(-EINVAL);
 97
 98	for_each_child_of_node(port, endpoint) {
 99		if (of_property_read_u32(endpoint, "reg", &endpoint_id))
100			endpoint_id = 0;
101
102		/* if subdriver (> 0) or error case (< 0), ignore entry */
103		if (rockchip_drm_endpoint_is_subdriver(endpoint) != 0)
104			continue;
105
106		child_count++;
107		ret = drm_of_find_panel_or_bridge(dev->of_node, video_port,
108						  endpoint_id, &panel, &bridge);
109		if (!ret) {
110			of_node_put(endpoint);
111			break;
112		}
113	}
114
115	of_node_put(port);
116
117	/* if the rgb output is not connected to anything, just return */
118	if (!child_count)
119		return NULL;
120
121	if (ret < 0) {
122		if (ret != -EPROBE_DEFER)
123			DRM_DEV_ERROR(dev, "failed to find panel or bridge %d\n", ret);
124		return ERR_PTR(ret);
125	}
126
127	encoder = &rgb->encoder.encoder;
128	encoder->possible_crtcs = drm_crtc_mask(crtc);
129
130	ret = drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_NONE);
131	if (ret < 0) {
132		DRM_DEV_ERROR(drm_dev->dev,
133			      "failed to initialize encoder: %d\n", ret);
134		return ERR_PTR(ret);
135	}
136
137	drm_encoder_helper_add(encoder, &rockchip_rgb_encoder_helper_funcs);
138
139	if (panel) {
140		bridge = drm_panel_bridge_add_typed(panel,
141						    DRM_MODE_CONNECTOR_LVDS);
142		if (IS_ERR(bridge))
143			return ERR_CAST(bridge);
144	}
145
146	rgb->bridge = bridge;
147
148	ret = drm_bridge_attach(encoder, rgb->bridge, NULL,
149				DRM_BRIDGE_ATTACH_NO_CONNECTOR);
150	if (ret)
151		goto err_free_encoder;
152
153	connector = &rgb->connector;
154	connector = drm_bridge_connector_init(rgb->drm_dev, encoder);
155	if (IS_ERR(connector)) {
156		DRM_DEV_ERROR(drm_dev->dev,
157			      "failed to initialize bridge connector: %pe\n",
158			      connector);
159		ret = PTR_ERR(connector);
160		goto err_free_encoder;
161	}
162
163	rgb->encoder.crtc_endpoint_id = endpoint_id;
164
165	ret = drm_connector_attach_encoder(connector, encoder);
166	if (ret < 0) {
167		DRM_DEV_ERROR(drm_dev->dev,
168			      "failed to attach encoder: %d\n", ret);
169		goto err_free_connector;
170	}
171
172	return rgb;
173
174err_free_connector:
175	drm_connector_cleanup(connector);
176err_free_encoder:
177	drm_encoder_cleanup(encoder);
178	return ERR_PTR(ret);
179}
180EXPORT_SYMBOL_GPL(rockchip_rgb_init);
181
182void rockchip_rgb_fini(struct rockchip_rgb *rgb)
183{
184	drm_panel_bridge_remove(rgb->bridge);
185	drm_connector_cleanup(&rgb->connector);
186	drm_encoder_cleanup(&rgb->encoder.encoder);
187}
188EXPORT_SYMBOL_GPL(rockchip_rgb_fini);