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
  22 #define encoder_to_rgb(c) container_of(c, struct rockchip_rgb, encoder)
  23
  24 struct rockchip_rgb {
  25         struct device *dev;
  26         struct drm_device *drm_dev;
  27         struct drm_bridge *bridge;
  28         struct drm_encoder encoder;
  29         int output_mode;
  30 };
  31
  32 static int
  33 rockchip_rgb_encoder_atomic_check(struct drm_encoder *encoder,
  34                                    struct drm_crtc_state *crtc_state,
  35                                    struct drm_connector_state *conn_state)
  36 {
  37         struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
  38         struct drm_connector *connector = conn_state->connector;
  39         struct drm_display_info *info = &connector->display_info;
  40         u32 bus_format;
  41
  42         if (info->num_bus_formats)
  43                 bus_format = info->bus_formats[0];
  44         else
  45                 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
  46
  47         switch (bus_format) {
  48         case MEDIA_BUS_FMT_RGB666_1X18:
  49                 s->output_mode = ROCKCHIP_OUT_MODE_P666;
  50                 break;
  51         case MEDIA_BUS_FMT_RGB565_1X16:
  52                 s->output_mode = ROCKCHIP_OUT_MODE_P565;
  53                 break;
  54         case MEDIA_BUS_FMT_RGB888_1X24:
  55         case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
  56         default:
  57                 s->output_mode = ROCKCHIP_OUT_MODE_P888;
  58                 break;
  59         }
  60
  61         s->output_type = DRM_MODE_CONNECTOR_LVDS;
  62
  63         return 0;
  64 }
  65
  66 static const
  67 struct drm_encoder_helper_funcs rockchip_rgb_encoder_helper_funcs = {
  68         .atomic_check = rockchip_rgb_encoder_atomic_check,
  69 };
  70
  71 struct rockchip_rgb *rockchip_rgb_init(struct device *dev,
  72                                        struct drm_crtc *crtc,
  73                                        struct drm_device *drm_dev)
  74 {
  75         struct rockchip_rgb *rgb;
  76         struct drm_encoder *encoder;
  77         struct device_node *port, *endpoint;
  78         u32 endpoint_id;
  79         int ret = 0, child_count = 0;
  80         struct drm_panel *panel;
  81         struct drm_bridge *bridge;
  82
  83         rgb = devm_kzalloc(dev, sizeof(*rgb), GFP_KERNEL);
  84         if (!rgb)
  85                 return ERR_PTR(-ENOMEM);
  86
  87         rgb->dev = dev;
  88         rgb->drm_dev = drm_dev;
  89
  90         port = of_graph_get_port_by_id(dev->of_node, 0);
  91         if (!port)
  92                 return ERR_PTR(-EINVAL);
  93
  94         for_each_child_of_node(port, endpoint) {
  95                 if (of_property_read_u32(endpoint, "reg", &endpoint_id))
  96                         endpoint_id = 0;
  97
  98                 /* if subdriver (> 0) or error case (< 0), ignore entry */
  99                 if (rockchip_drm_endpoint_is_subdriver(endpoint) != 0)
 100                         continue;
 101
 102                 child_count++;
 103                 ret = drm_of_find_panel_or_bridge(dev->of_node, 0, endpoint_id,
 104                                                   &panel, &bridge);
 105                 if (!ret) {
 106                         of_node_put(endpoint);
 107                         break;
 108                 }
 109         }
 110
 111         of_node_put(port);
 112
 113         /* if the rgb output is not connected to anything, just return */
 114         if (!child_count)
 115                 return NULL;
 116
 117         if (ret < 0) {
 118                 if (ret != -EPROBE_DEFER)
 119                         DRM_DEV_ERROR(dev, "failed to find panel or bridge %d\n", ret);
 120                 return ERR_PTR(ret);
 121         }
 122
 123         encoder = &rgb->encoder;
 124         encoder->possible_crtcs = drm_crtc_mask(crtc);
 125
 126         ret = drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_NONE);
 127         if (ret < 0) {
 128                 DRM_DEV_ERROR(drm_dev->dev,
 129                               "failed to initialize encoder: %d\n", ret);
 130                 return ERR_PTR(ret);
 131         }
 132
 133         drm_encoder_helper_add(encoder, &rockchip_rgb_encoder_helper_funcs);
 134
 135         if (panel) {
 136                 bridge = drm_panel_bridge_add_typed(panel,
 137                                                     DRM_MODE_CONNECTOR_LVDS);
 138                 if (IS_ERR(bridge))
 139                         return ERR_CAST(bridge);
 140         }
 141
 142         rgb->bridge = bridge;
 143
 144         ret = drm_bridge_attach(encoder, rgb->bridge, NULL, 0);
 145         if (ret) {
 146                 DRM_DEV_ERROR(drm_dev->dev,
 147                               "failed to attach bridge: %d\n", ret);
 148                 goto err_free_encoder;
 149         }
 150
 151         return rgb;
 152
 153 err_free_encoder:
 154         drm_encoder_cleanup(encoder);
 155         return ERR_PTR(ret);
 156 }
 157 EXPORT_SYMBOL_GPL(rockchip_rgb_init);
 158
 159 void rockchip_rgb_fini(struct rockchip_rgb *rgb)
 160 {
 161         drm_panel_bridge_remove(rgb->bridge);
 162         drm_encoder_cleanup(&rgb->encoder);
 163 }
 164 EXPORT_SYMBOL_GPL(rockchip_rgb_fini);