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_bridge_connector.h> 14 #include <drm/drm_dp_helper.h> 15 #include <drm/drm_of.h> 16 #include <drm/drm_panel.h> 17 #include <drm/drm_probe_helper.h> 18 #include <drm/drm_simple_kms_helper.h> 19 20 #include "rockchip_drm_drv.h" 21 #include "rockchip_drm_vop.h" 22 #include "rockchip_rgb.h" 23 24 #define encoder_to_rgb(c) container_of(c, struct rockchip_rgb, encoder) 25 26 struct rockchip_rgb { 27 struct device *dev; 28 struct drm_device *drm_dev; 29 struct drm_bridge *bridge; 30 struct drm_encoder encoder; 31 struct drm_connector connector; 32 int output_mode; 33 }; 34 35 static int 36 rockchip_rgb_encoder_atomic_check(struct drm_encoder *encoder, 37 struct drm_crtc_state *crtc_state, 38 struct drm_connector_state *conn_state) 39 { 40 struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state); 41 struct drm_connector *connector = conn_state->connector; 42 struct drm_display_info *info = &connector->display_info; 43 u32 bus_format; 44 45 if (info->num_bus_formats) 46 bus_format = info->bus_formats[0]; 47 else 48 bus_format = MEDIA_BUS_FMT_RGB888_1X24; 49 50 switch (bus_format) { 51 case MEDIA_BUS_FMT_RGB666_1X18: 52 s->output_mode = ROCKCHIP_OUT_MODE_P666; 53 break; 54 case MEDIA_BUS_FMT_RGB565_1X16: 55 s->output_mode = ROCKCHIP_OUT_MODE_P565; 56 break; 57 case MEDIA_BUS_FMT_RGB888_1X24: 58 case MEDIA_BUS_FMT_RGB666_1X24_CPADHI: 59 default: 60 s->output_mode = ROCKCHIP_OUT_MODE_P888; 61 break; 62 } 63 64 s->output_type = DRM_MODE_CONNECTOR_LVDS; 65 66 return 0; 67 } 68 69 static const 70 struct drm_encoder_helper_funcs rockchip_rgb_encoder_helper_funcs = { 71 .atomic_check = rockchip_rgb_encoder_atomic_check, 72 }; 73 74 struct rockchip_rgb *rockchip_rgb_init(struct device *dev, 75 struct drm_crtc *crtc, 76 struct drm_device *drm_dev) 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, 0); 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, 0, endpoint_id, 108 &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; 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 ret = drm_connector_attach_encoder(connector, encoder); 164 if (ret < 0) { 165 DRM_DEV_ERROR(drm_dev->dev, 166 "failed to attach encoder: %d\n", ret); 167 goto err_free_connector; 168 } 169 170 return rgb; 171 172 err_free_connector: 173 drm_connector_cleanup(connector); 174 err_free_encoder: 175 drm_encoder_cleanup(encoder); 176 return ERR_PTR(ret); 177 } 178 EXPORT_SYMBOL_GPL(rockchip_rgb_init); 179 180 void rockchip_rgb_fini(struct rockchip_rgb *rgb) 181 { 182 drm_panel_bridge_remove(rgb->bridge); 183 drm_connector_cleanup(&rgb->connector); 184 drm_encoder_cleanup(&rgb->encoder); 185 } 186 EXPORT_SYMBOL_GPL(rockchip_rgb_fini); 187