drivers/gpu/drm/rockchip/rockchip_rgb.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/rockchip/rockchip_rgb.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/rockchip/rockchip_rgb.c
Extension
.c
Size
4431 bytes
Lines
180
Domain
Driver Families
Bucket
drivers/gpu
Inferred role
Driver Families: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct rockchip_rgb {
	struct device *dev;
	struct drm_device *drm_dev;
	struct drm_bridge *bridge;
	struct rockchip_encoder encoder;
	struct drm_connector connector;
	int output_mode;
};

static int
rockchip_rgb_encoder_atomic_check(struct drm_encoder *encoder,
				   struct drm_crtc_state *crtc_state,
				   struct drm_connector_state *conn_state)
{
	struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
	struct drm_connector *connector = conn_state->connector;
	struct drm_display_info *info = &connector->display_info;
	u32 bus_format;

	if (info->num_bus_formats)
		bus_format = info->bus_formats[0];
	else
		bus_format = MEDIA_BUS_FMT_RGB888_1X24;

	switch (bus_format) {
	case MEDIA_BUS_FMT_RGB666_1X18:
		s->output_mode = ROCKCHIP_OUT_MODE_P666;
		break;
	case MEDIA_BUS_FMT_RGB565_1X16:
		s->output_mode = ROCKCHIP_OUT_MODE_P565;
		break;
	case MEDIA_BUS_FMT_RGB888_1X24:
	case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
	default:
		s->output_mode = ROCKCHIP_OUT_MODE_P888;
		break;
	}

	s->output_type = DRM_MODE_CONNECTOR_LVDS;

	return 0;
}

static const
struct drm_encoder_helper_funcs rockchip_rgb_encoder_helper_funcs = {
	.atomic_check = rockchip_rgb_encoder_atomic_check,
};

struct rockchip_rgb *rockchip_rgb_init(struct device *dev,
				       struct drm_crtc *crtc,
				       struct drm_device *drm_dev,
				       int video_port)
{
	struct rockchip_rgb *rgb;
	struct drm_encoder *encoder;
	struct device_node *port, *endpoint;
	u32 endpoint_id;
	int ret = 0, child_count = 0;
	struct drm_panel *panel;
	struct drm_bridge *bridge;
	struct drm_connector *connector;

	rgb = devm_kzalloc(dev, sizeof(*rgb), GFP_KERNEL);
	if (!rgb)
		return ERR_PTR(-ENOMEM);

	rgb->dev = dev;
	rgb->drm_dev = drm_dev;

	port = of_graph_get_port_by_id(dev->of_node, video_port);
	if (!port)
		return ERR_PTR(-EINVAL);

	for_each_child_of_node(port, endpoint) {
		if (of_property_read_u32(endpoint, "reg", &endpoint_id))
			endpoint_id = 0;

		/* if subdriver (> 0) or error case (< 0), ignore entry */
		if (rockchip_drm_endpoint_is_subdriver(endpoint) != 0)
			continue;

		child_count++;
		ret = drm_of_find_panel_or_bridge(dev->of_node, video_port,
						  endpoint_id, &panel, &bridge);
		if (!ret) {
			of_node_put(endpoint);
			break;
		}
	}

Annotation

Implementation Notes