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_dp_helper.h> 13 #include <drm/drm_of.h> 14 #include <drm/drm_panel.h> 15 #include <drm/drm_probe_helper.h> 16 17 #include "rockchip_drm_drv.h" 18 #include "rockchip_drm_vop.h" 19 20 #define encoder_to_rgb(c) container_of(c, struct rockchip_rgb, encoder) 21 22 struct rockchip_rgb { 23 struct device *dev; 24 struct drm_device *drm_dev; 25 struct drm_bridge *bridge; 26 struct drm_encoder encoder; 27 int output_mode; 28 }; 29 30 static int 31 rockchip_rgb_encoder_atomic_check(struct drm_encoder *encoder, 32 struct drm_crtc_state *crtc_state, 33 struct drm_connector_state *conn_state) 34 { 35 struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state); 36 struct drm_connector *connector = conn_state->connector; 37 struct drm_display_info *info = &connector->display_info; 38 u32 bus_format; 39 40 if (info->num_bus_formats) 41 bus_format = info->bus_formats[0]; 42 else 43 bus_format = MEDIA_BUS_FMT_RGB888_1X24; 44 45 switch (bus_format) { 46 case MEDIA_BUS_FMT_RGB666_1X18: 47 s->output_mode = ROCKCHIP_OUT_MODE_P666; 48 break; 49 case MEDIA_BUS_FMT_RGB565_1X16: 50 s->output_mode = ROCKCHIP_OUT_MODE_P565; 51 break; 52 case MEDIA_BUS_FMT_RGB888_1X24: 53 case MEDIA_BUS_FMT_RGB666_1X24_CPADHI: 54 default: 55 s->output_mode = ROCKCHIP_OUT_MODE_P888; 56 break; 57 } 58 59 s->output_type = DRM_MODE_CONNECTOR_LVDS; 60 61 return 0; 62 } 63 64 static const 65 struct drm_encoder_helper_funcs rockchip_rgb_encoder_helper_funcs = { 66 .atomic_check = rockchip_rgb_encoder_atomic_check, 67 }; 68 69 static const struct drm_encoder_funcs rockchip_rgb_encoder_funcs = { 70 .destroy = drm_encoder_cleanup, 71 }; 72 73 struct rockchip_rgb *rockchip_rgb_init(struct device *dev, 74 struct drm_crtc *crtc, 75 struct drm_device *drm_dev) 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 85 rgb = devm_kzalloc(dev, sizeof(*rgb), GFP_KERNEL); 86 if (!rgb) 87 return ERR_PTR(-ENOMEM); 88 89 rgb->dev = dev; 90 rgb->drm_dev = drm_dev; 91 92 port = of_graph_get_port_by_id(dev->of_node, 0); 93 if (!port) 94 return ERR_PTR(-EINVAL); 95 96 for_each_child_of_node(port, endpoint) { 97 if (of_property_read_u32(endpoint, "reg", &endpoint_id)) 98 endpoint_id = 0; 99 100 if (rockchip_drm_endpoint_is_subdriver(endpoint) > 0) 101 continue; 102 103 child_count++; 104 ret = drm_of_find_panel_or_bridge(dev->of_node, 0, endpoint_id, 105 &panel, &bridge); 106 if (!ret) { 107 of_node_put(endpoint); 108 break; 109 } 110 } 111 112 of_node_put(port); 113 114 /* if the rgb output is not connected to anything, just return */ 115 if (!child_count) 116 return NULL; 117 118 if (ret < 0) { 119 if (ret != -EPROBE_DEFER) 120 DRM_DEV_ERROR(dev, "failed to find panel or bridge %d\n", ret); 121 return ERR_PTR(ret); 122 } 123 124 encoder = &rgb->encoder; 125 encoder->possible_crtcs = drm_crtc_mask(crtc); 126 127 ret = drm_encoder_init(drm_dev, encoder, &rockchip_rgb_encoder_funcs, 128 DRM_MODE_ENCODER_NONE, NULL); 129 if (ret < 0) { 130 DRM_DEV_ERROR(drm_dev->dev, 131 "failed to initialize encoder: %d\n", ret); 132 return ERR_PTR(ret); 133 } 134 135 drm_encoder_helper_add(encoder, &rockchip_rgb_encoder_helper_funcs); 136 137 if (panel) { 138 bridge = drm_panel_bridge_add(panel, DRM_MODE_CONNECTOR_LVDS); 139 if (IS_ERR(bridge)) 140 return ERR_CAST(bridge); 141 } 142 143 rgb->bridge = bridge; 144 145 ret = drm_bridge_attach(encoder, rgb->bridge, NULL); 146 if (ret) { 147 DRM_DEV_ERROR(drm_dev->dev, 148 "failed to attach bridge: %d\n", ret); 149 goto err_free_encoder; 150 } 151 152 return rgb; 153 154 err_free_encoder: 155 drm_encoder_cleanup(encoder); 156 return ERR_PTR(ret); 157 } 158 EXPORT_SYMBOL_GPL(rockchip_rgb_init); 159 160 void rockchip_rgb_fini(struct rockchip_rgb *rgb) 161 { 162 drm_panel_bridge_remove(rgb->bridge); 163 drm_encoder_cleanup(&rgb->encoder); 164 } 165 EXPORT_SYMBOL_GPL(rockchip_rgb_fini); 166