linux/drivers/gpu/drm/rockchip/rockchip_rgb.c
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   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
  22struct 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
  30static int
  31rockchip_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
  64static const
  65struct drm_encoder_helper_funcs rockchip_rgb_encoder_helper_funcs = {
  66        .atomic_check = rockchip_rgb_encoder_atomic_check,
  67};
  68
  69static const struct drm_encoder_funcs rockchip_rgb_encoder_funcs = {
  70        .destroy = drm_encoder_cleanup,
  71};
  72
  73struct 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
 154err_free_encoder:
 155        drm_encoder_cleanup(encoder);
 156        return ERR_PTR(ret);
 157}
 158EXPORT_SYMBOL_GPL(rockchip_rgb_init);
 159
 160void rockchip_rgb_fini(struct rockchip_rgb *rgb)
 161{
 162        drm_panel_bridge_remove(rgb->bridge);
 163        drm_encoder_cleanup(&rgb->encoder);
 164}
 165EXPORT_SYMBOL_GPL(rockchip_rgb_fini);
 166