drivers/gpu/drm/rockchip/rockchip_rgb.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) Rockchip Electronics Co., Ltd.
   4  * Author:
   5  *      Sandy Huang <[email protected]>
   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);