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 <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);