root/drivers/gpu/drm/rockchip/rockchip_rgb.c

DEFINITIONS

1. rockchip_rgb_encoder_atomic_check
2. rockchip_rgb_init
3. rockchip_rgb_fini

   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);