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
  18 #include "rockchip_drm_drv.h"
  19 #include "rockchip_drm_vop.h"
  20
  21 #define encoder_to_rgb(c) container_of(c, struct rockchip_rgb, encoder)
  22
  23 struct rockchip_rgb {
  24         struct device *dev;
  25         struct drm_device *drm_dev;
  26         struct drm_bridge *bridge;
  27         struct drm_encoder encoder;
  28         int output_mode;
  29 };
  30
  31 static int
  32 rockchip_rgb_encoder_atomic_check(struct drm_encoder *encoder,
  33                                    struct drm_crtc_state *crtc_state,
  34                                    struct drm_connector_state *conn_state)
  35 {
  36         struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
  37         struct drm_connector *connector = conn_state->connector;
  38         struct drm_display_info *info = &connector->display_info;
  39         u32 bus_format;
  40
  41         if (info->num_bus_formats)
  42                 bus_format = info->bus_formats[0];
  43         else
  44                 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
  45
  46         switch (bus_format) {
  47         case MEDIA_BUS_FMT_RGB666_1X18:
  48                 s->output_mode = ROCKCHIP_OUT_MODE_P666;
  49                 break;
  50         case MEDIA_BUS_FMT_RGB565_1X16:
  51                 s->output_mode = ROCKCHIP_OUT_MODE_P565;
  52                 break;
  53         case MEDIA_BUS_FMT_RGB888_1X24:
  54         case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
  55         default:
  56                 s->output_mode = ROCKCHIP_OUT_MODE_P888;
  57                 break;
  58         }
  59
  60         s->output_type = DRM_MODE_CONNECTOR_LVDS;
  61
  62         return 0;
  63 }
  64
  65 static const
  66 struct drm_encoder_helper_funcs rockchip_rgb_encoder_helper_funcs = {
  67         .atomic_check = rockchip_rgb_encoder_atomic_check,
  68 };
  69
  70 static const struct drm_encoder_funcs rockchip_rgb_encoder_funcs = {
  71         .destroy = drm_encoder_cleanup,
  72 };
  73
  74 struct rockchip_rgb *rockchip_rgb_init(struct device *dev,
  75                                        struct drm_crtc *crtc,
  76                                        struct drm_device *drm_dev)
  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
  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, 0);
  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 (rockchip_drm_endpoint_is_subdriver(endpoint) > 0)
 102                         continue;
 103
 104                 child_count++;
 105                 ret = drm_of_find_panel_or_bridge(dev->of_node, 0, endpoint_id,
 106                                                   &panel, &bridge);
 107                 if (!ret) {
 108                         of_node_put(endpoint);
 109                         break;
 110                 }
 111         }
 112
 113         of_node_put(port);
 114
 115         /* if the rgb output is not connected to anything, just return */
 116         if (!child_count)
 117                 return NULL;
 118
 119         if (ret < 0) {
 120                 if (ret != -EPROBE_DEFER)
 121                         DRM_DEV_ERROR(dev, "failed to find panel or bridge %d\n", ret);
 122                 return ERR_PTR(ret);
 123         }
 124
 125         encoder = &rgb->encoder;
 126         encoder->possible_crtcs = drm_crtc_mask(crtc);
 127
 128         ret = drm_encoder_init(drm_dev, encoder, &rockchip_rgb_encoder_funcs,
 129                                DRM_MODE_ENCODER_NONE, NULL);
 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         if (ret) {
 149                 DRM_DEV_ERROR(drm_dev->dev,
 150                               "failed to attach bridge: %d\n", ret);
 151                 goto err_free_encoder;
 152         }
 153
 154         return rgb;
 155
 156 err_free_encoder:
 157         drm_encoder_cleanup(encoder);
 158         return ERR_PTR(ret);
 159 }
 160 EXPORT_SYMBOL_GPL(rockchip_rgb_init);
 161
 162 void rockchip_rgb_fini(struct rockchip_rgb *rgb)
 163 {
 164         drm_panel_bridge_remove(rgb->bridge);
 165         drm_encoder_cleanup(&rgb->encoder);
 166 }
 167 EXPORT_SYMBOL_GPL(rockchip_rgb_fini);