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 27 struct 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 36 static int 37 rockchip_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 70 static const 71 struct drm_encoder_helper_funcs rockchip_rgb_encoder_helper_funcs = { 72 .atomic_check = rockchip_rgb_encoder_atomic_check, 73 }; 74 75 struct 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; 172 173 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); 186 } 187 EXPORT_SYMBOL_GPL(rockchip_rgb_fini); 188