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 24 struct 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 33 static int 34 rockchip_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 67 static const 68 struct drm_encoder_helper_funcs rockchip_rgb_encoder_helper_funcs = { 69 .atomic_check = rockchip_rgb_encoder_atomic_check, 70 }; 71 72 struct 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; 172 173 err_free_connector: 174 drm_connector_cleanup(connector); 175 err_free_encoder: 176 drm_encoder_cleanup(encoder); 177 return ERR_PTR(ret); 178 } 179 EXPORT_SYMBOL_GPL(rockchip_rgb_init); 180 181 void 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 } 187 EXPORT_SYMBOL_GPL(rockchip_rgb_fini); 188