drivers/gpu/drm/sun4i/sun4i_lvds.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/sun4i/sun4i_lvds.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/sun4i/sun4i_lvds.c
Extension
.c
Size
3899 bytes
Lines
157
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 sun4i_lvds {
	struct drm_connector	connector;
	struct drm_encoder	encoder;

	struct drm_panel	*panel;
};

static inline struct sun4i_lvds *
drm_connector_to_sun4i_lvds(struct drm_connector *connector)
{
	return container_of(connector, struct sun4i_lvds,
			    connector);
}

static inline struct sun4i_lvds *
drm_encoder_to_sun4i_lvds(struct drm_encoder *encoder)
{
	return container_of(encoder, struct sun4i_lvds,
			    encoder);
}

static int sun4i_lvds_get_modes(struct drm_connector *connector)
{
	struct sun4i_lvds *lvds =
		drm_connector_to_sun4i_lvds(connector);

	return drm_panel_get_modes(lvds->panel, connector);
}

static const struct drm_connector_helper_funcs sun4i_lvds_con_helper_funcs = {
	.get_modes	= sun4i_lvds_get_modes,
};

static void
sun4i_lvds_connector_destroy(struct drm_connector *connector)
{
	drm_connector_cleanup(connector);
}

static const struct drm_connector_funcs sun4i_lvds_con_funcs = {
	.fill_modes		= drm_helper_probe_single_connector_modes,
	.destroy		= sun4i_lvds_connector_destroy,
	.reset			= drm_atomic_helper_connector_reset,
	.atomic_duplicate_state	= drm_atomic_helper_connector_duplicate_state,
	.atomic_destroy_state	= drm_atomic_helper_connector_destroy_state,
};

static void sun4i_lvds_encoder_enable(struct drm_encoder *encoder)
{
	struct sun4i_lvds *lvds = drm_encoder_to_sun4i_lvds(encoder);

	DRM_DEBUG_DRIVER("Enabling LVDS output\n");

	if (lvds->panel) {
		drm_panel_prepare(lvds->panel);
		drm_panel_enable(lvds->panel);
	}
}

static void sun4i_lvds_encoder_disable(struct drm_encoder *encoder)
{
	struct sun4i_lvds *lvds = drm_encoder_to_sun4i_lvds(encoder);

	DRM_DEBUG_DRIVER("Disabling LVDS output\n");

	if (lvds->panel) {
		drm_panel_disable(lvds->panel);
		drm_panel_unprepare(lvds->panel);
	}
}

static const struct drm_encoder_helper_funcs sun4i_lvds_enc_helper_funcs = {
	.disable	= sun4i_lvds_encoder_disable,
	.enable		= sun4i_lvds_encoder_enable,
};

int sun4i_lvds_init(struct drm_device *drm, struct sun4i_tcon *tcon)
{
	struct drm_encoder *encoder;
	struct drm_bridge *bridge;
	struct sun4i_lvds *lvds;
	int ret;

	lvds = devm_kzalloc(drm->dev, sizeof(*lvds), GFP_KERNEL);
	if (!lvds)
		return -ENOMEM;
	encoder = &lvds->encoder;

	ret = drm_of_find_panel_or_bridge(tcon->dev->of_node, 1, 0,
					  &lvds->panel, &bridge);

Annotation

Implementation Notes