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  * This software is licensed under the terms of the GNU General Public
   8  * License version 2, as published by the Free Software Foundation, and
   9  * may be copied, distributed, and modified under those terms.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #include <drm/drmP.h>
  18 #include <drm/drm_atomic_helper.h>
  19 #include <drm/drm_crtc_helper.h>
  20 #include <drm/drm_dp_helper.h>
  21 #include <drm/drm_panel.h>
  22 #include <drm/drm_of.h>
  23
  24 #include <linux/component.h>
  25 #include <linux/of_graph.h>
  26
  27 #include "rockchip_drm_drv.h"
  28 #include "rockchip_drm_vop.h"
  29
  30 #define encoder_to_rgb(c) container_of(c, struct rockchip_rgb, encoder)
  31
  32 struct rockchip_rgb {
  33         struct device *dev;
  34         struct drm_device *drm_dev;
  35         struct drm_bridge *bridge;
  36         struct drm_encoder encoder;
  37         int output_mode;
  38 };
  39
  40 static int
  41 rockchip_rgb_encoder_atomic_check(struct drm_encoder *encoder,
  42                                    struct drm_crtc_state *crtc_state,
  43                                    struct drm_connector_state *conn_state)
  44 {
  45         struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
  46         struct drm_connector *connector = conn_state->connector;
  47         struct drm_display_info *info = &connector->display_info;
  48         u32 bus_format;
  49
  50         if (info->num_bus_formats)
  51                 bus_format = info->bus_formats[0];
  52         else
  53                 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
  54
  55         switch (bus_format) {
  56         case MEDIA_BUS_FMT_RGB666_1X18:
  57                 s->output_mode = ROCKCHIP_OUT_MODE_P666;
  58                 break;
  59         case MEDIA_BUS_FMT_RGB565_1X16:
  60                 s->output_mode = ROCKCHIP_OUT_MODE_P565;
  61                 break;
  62         case MEDIA_BUS_FMT_RGB888_1X24:
  63         case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
  64         default:
  65                 s->output_mode = ROCKCHIP_OUT_MODE_P888;
  66                 break;
  67         }
  68
  69         s->output_type = DRM_MODE_CONNECTOR_LVDS;
  70
  71         return 0;
  72 }
  73
  74 static const
  75 struct drm_encoder_helper_funcs rockchip_rgb_encoder_helper_funcs = {
  76         .atomic_check = rockchip_rgb_encoder_atomic_check,
  77 };
  78
  79 static const struct drm_encoder_funcs rockchip_rgb_encoder_funcs = {
  80         .destroy = drm_encoder_cleanup,
  81 };
  82
  83 struct rockchip_rgb *rockchip_rgb_init(struct device *dev,
  84                                        struct drm_crtc *crtc,
  85                                        struct drm_device *drm_dev)
  86 {
  87         struct rockchip_rgb *rgb;
  88         struct drm_encoder *encoder;
  89         struct device_node *port, *endpoint;
  90         u32 endpoint_id;
  91         int ret = 0, child_count = 0;
  92         struct drm_panel *panel;
  93         struct drm_bridge *bridge;
  94
  95         rgb = devm_kzalloc(dev, sizeof(*rgb), GFP_KERNEL);
  96         if (!rgb)
  97                 return ERR_PTR(-ENOMEM);
  98
  99         rgb->dev = dev;
 100         rgb->drm_dev = drm_dev;
 101
 102         port = of_graph_get_port_by_id(dev->of_node, 0);
 103         if (!port)
 104                 return ERR_PTR(-EINVAL);
 105
 106         for_each_child_of_node(port, endpoint) {
 107                 if (of_property_read_u32(endpoint, "reg", &endpoint_id))
 108                         endpoint_id = 0;
 109
 110                 if (rockchip_drm_endpoint_is_subdriver(endpoint) > 0)
 111                         continue;
 112
 113                 child_count++;
 114                 ret = drm_of_find_panel_or_bridge(dev->of_node, 0, endpoint_id,
 115                                                   &panel, &bridge);
 116                 if (!ret) {
 117                         of_node_put(endpoint);
 118                         break;
 119                 }
 120         }
 121
 122         of_node_put(port);
 123
 124         /* if the rgb output is not connected to anything, just return */
 125         if (!child_count)
 126                 return NULL;
 127
 128         if (ret < 0) {
 129                 if (ret != -EPROBE_DEFER)
 130                         DRM_DEV_ERROR(dev, "failed to find panel or bridge %d\n", ret);
 131                 return ERR_PTR(ret);
 132         }
 133
 134         encoder = &rgb->encoder;
 135         encoder->possible_crtcs = drm_crtc_mask(crtc);
 136
 137         ret = drm_encoder_init(drm_dev, encoder, &rockchip_rgb_encoder_funcs,
 138                                DRM_MODE_ENCODER_NONE, NULL);
 139         if (ret < 0) {
 140                 DRM_DEV_ERROR(drm_dev->dev,
 141                               "failed to initialize encoder: %d\n", ret);
 142                 return ERR_PTR(ret);
 143         }
 144
 145         drm_encoder_helper_add(encoder, &rockchip_rgb_encoder_helper_funcs);
 146
 147         if (panel) {
 148                 bridge = drm_panel_bridge_add(panel, DRM_MODE_CONNECTOR_LVDS);
 149                 if (IS_ERR(bridge))
 150                         return ERR_CAST(bridge);
 151         }
 152
 153         rgb->bridge = bridge;
 154
 155         ret = drm_bridge_attach(encoder, rgb->bridge, NULL);
 156         if (ret) {
 157                 DRM_DEV_ERROR(drm_dev->dev,
 158                               "failed to attach bridge: %d\n", ret);
 159                 goto err_free_encoder;
 160         }
 161
 162         return rgb;
 163
 164 err_free_encoder:
 165         drm_encoder_cleanup(encoder);
 166         return ERR_PTR(ret);
 167 }
 168 EXPORT_SYMBOL_GPL(rockchip_rgb_init);
 169
 170 void rockchip_rgb_fini(struct rockchip_rgb *rgb)
 171 {
 172         drm_panel_bridge_remove(rgb->bridge);
 173         drm_encoder_cleanup(&rgb->encoder);
 174 }
 175 EXPORT_SYMBOL_GPL(rockchip_rgb_fini);