LXR linux/drivers/gpu/drm/rockchip/rockchip

   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
  25struct 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
  33static int
  34rockchip_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
  67static const
  68struct drm_encoder_helper_funcs rockchip_rgb_encoder_helper_funcs = {
  69        .atomic_check = rockchip_rgb_encoder_atomic_check,
  70};
  71
  72struct 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                goto err_free_encoder;
 148
 149        return rgb;
 150
 151err_free_encoder:
 152        drm_encoder_cleanup(encoder);
 153        return ERR_PTR(ret);
 154}
 155EXPORT_SYMBOL_GPL(rockchip_rgb_init);
 156
 157void rockchip_rgb_fini(struct rockchip_rgb *rgb)
 158{
 159        drm_panel_bridge_remove(rgb->bridge);
 160        drm_encoder_cleanup(&rgb->encoder);
 161}
 162EXPORT_SYMBOL_GPL(rockchip_rgb_fini);
 163