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_dp_helper.h> 14 #include <drm/drm_of.h> 15 #include <drm/drm_panel.h> 16 #include <drm/drm_probe_helper.h> 17 #include <drm/drm_simple_kms_helper.h> 18 19 #include "rockchip_drm_drv.h" 20 #include "rockchip_drm_vop.h" 21 #include "rockchip_rgb.h" 22 23 #define encoder_to_rgb(c) container_of(c, struct rockchip_rgb, encoder) 24 25 struct rockchip_rgb { 26 struct device *dev; 27 struct drm_device *drm_dev; 28 struct drm_bridge *bridge; 29 struct drm_encoder encoder; 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 { 76 struct rockchip_rgb *rgb; 77 struct drm_encoder *encoder; 78 struct device_node *port, *endpoint; 79 u32 endpoint_id; 80 int ret = 0, child_count = 0; 81 struct drm_panel *panel; 82 struct drm_bridge *bridge; 83 84 rgb = devm_kzalloc(dev, sizeof(*rgb), GFP_KERNEL); 85 if (!rgb) 86 return ERR_PTR(-ENOMEM); 87 88 rgb->dev = dev; 89 rgb->drm_dev = drm_dev; 90 91 port = of_graph_get_port_by_id(dev->of_node, 0); 92 if (!port) 93 return ERR_PTR(-EINVAL); 94 95 for_each_child_of_node(port, endpoint) { 96 if (of_property_read_u32(endpoint, "reg", &endpoint_id)) 97 endpoint_id = 0; 98 99 /* if subdriver (> 0) or error case (< 0), ignore entry */ 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_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_NONE); 128 if (ret < 0) { 129 DRM_DEV_ERROR(drm_dev->dev, 130 "failed to initialize encoder: %d\n", ret); 131 return ERR_PTR(ret); 132 } 133 134 drm_encoder_helper_add(encoder, &rockchip_rgb_encoder_helper_funcs); 135 136 if (panel) { 137 bridge = drm_panel_bridge_add_typed(panel, 138 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, 0); 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