drivers/gpu/drm/rockchip/rockchip_rgb.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) Fuzhou 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_drm_vop.h"
  23 #include "rockchip_rgb.h"
  24
  25 struct rockchip_rgb {
  26         struct device *dev;
  27         struct drm_device *drm_dev;
  28         struct drm_bridge *bridge;
  29         struct rockchip_encoder encoder;
  30         struct drm_connector connector;
  31         int output_mode;
  32 };
  33
  34 static int
  35 rockchip_rgb_encoder_atomic_check(struct drm_encoder *encoder,
  36                                    struct drm_crtc_state *crtc_state,
  37                                    struct drm_connector_state *conn_state)
  38 {
  39         struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
  40         struct drm_connector *connector = conn_state->connector;
  41         struct drm_display_info *info = &connector->display_info;
  42         u32 bus_format;
  43
  44         if (info->num_bus_formats)
  45                 bus_format = info->bus_formats[0];
  46         else
  47                 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
  48
  49         switch (bus_format) {
  50         case MEDIA_BUS_FMT_RGB666_1X18:
  51                 s->output_mode = ROCKCHIP_OUT_MODE_P666;
  52                 break;
  53         case MEDIA_BUS_FMT_RGB565_1X16:
  54                 s->output_mode = ROCKCHIP_OUT_MODE_P565;
  55                 break;
  56         case MEDIA_BUS_FMT_RGB888_1X24:
  57         case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
  58         default:
  59                 s->output_mode = ROCKCHIP_OUT_MODE_P888;
  60                 break;
  61         }
  62
  63         s->output_type = DRM_MODE_CONNECTOR_LVDS;
  64
  65         return 0;
  66 }
  67
  68 static const
  69 struct drm_encoder_helper_funcs rockchip_rgb_encoder_helper_funcs = {
  70         .atomic_check = rockchip_rgb_encoder_atomic_check,
  71 };
  72
  73 struct rockchip_rgb *rockchip_rgb_init(struct device *dev,
  74                                        struct drm_crtc *crtc,
  75                                        struct drm_device *drm_dev,
  76                                        int video_port)
  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, video_port);
  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, video_port,
 108                                                   endpoint_id, &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.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         rgb->encoder.crtc_endpoint_id = endpoint_id;
 164
 165         ret = drm_connector_attach_encoder(connector, encoder);
 166         if (ret < 0) {
 167                 DRM_DEV_ERROR(drm_dev->dev,
 168                               "failed to attach encoder: %d\n", ret);
 169                 goto err_free_connector;
 170         }
 171
 172         return rgb;
 173
 174 err_free_connector:
 175         drm_connector_cleanup(connector);
 176 err_free_encoder:
 177         drm_encoder_cleanup(encoder);
 178         return ERR_PTR(ret);
 179 }
 180 EXPORT_SYMBOL_GPL(rockchip_rgb_init);
 181
 182 void rockchip_rgb_fini(struct rockchip_rgb *rgb)
 183 {
 184         drm_panel_bridge_remove(rgb->bridge);
 185         drm_connector_cleanup(&rgb->connector);
 186         drm_encoder_cleanup(&rgb->encoder.encoder);
 187 }
 188 EXPORT_SYMBOL_GPL(rockchip_rgb_fini);