drivers/gpu/drm/tidss/tidss_encoder.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/tidss/tidss_encoder.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/tidss/tidss_encoder.c
Extension
.c
Size
3757 bytes
Lines
132
Domain
Driver Families
Bucket
drivers/gpu
Inferred role
Driver Families: implementation source
Status
source 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 tidss_encoder {
	struct drm_bridge bridge;
	struct drm_encoder encoder;
	struct drm_connector *connector;
	struct drm_bridge *next_bridge;
	struct tidss_device *tidss;
};

static inline struct tidss_encoder
*bridge_to_tidss_encoder(struct drm_bridge *b)
{
	return container_of(b, struct tidss_encoder, bridge);
}

static int tidss_bridge_attach(struct drm_bridge *bridge,
			       struct drm_encoder *encoder,
			       enum drm_bridge_attach_flags flags)
{
	struct tidss_encoder *t_enc = bridge_to_tidss_encoder(bridge);

	return drm_bridge_attach(encoder, t_enc->next_bridge,
				 bridge, flags);
}

static int tidss_bridge_atomic_check(struct drm_bridge *bridge,
				     struct drm_bridge_state *bridge_state,
				     struct drm_crtc_state *crtc_state,
				     struct drm_connector_state *conn_state)
{
	struct tidss_encoder *t_enc = bridge_to_tidss_encoder(bridge);
	struct tidss_device *tidss = t_enc->tidss;
	struct tidss_crtc_state *tcrtc_state = to_tidss_crtc_state(crtc_state);
	struct drm_display_info *di = &conn_state->connector->display_info;
	struct drm_bridge_state *next_bridge_state = NULL;

	if (t_enc->next_bridge)
		next_bridge_state = drm_atomic_get_new_bridge_state(crtc_state->state,
								    t_enc->next_bridge);

	if (next_bridge_state) {
		tcrtc_state->bus_flags = next_bridge_state->input_bus_cfg.flags;
		tcrtc_state->bus_format = next_bridge_state->input_bus_cfg.format;
	} else if (di->num_bus_formats) {
		tcrtc_state->bus_format = di->bus_formats[0];
		tcrtc_state->bus_flags = di->bus_flags;
	} else {
		dev_err(tidss->dev, "%s: No bus_formats in connected display\n",
			__func__);
		return -EINVAL;
	}

	return 0;
}

static const struct drm_bridge_funcs tidss_bridge_funcs = {
	.attach				= tidss_bridge_attach,
	.atomic_check			= tidss_bridge_atomic_check,
	.atomic_reset			= drm_atomic_helper_bridge_reset,
	.atomic_duplicate_state		= drm_atomic_helper_bridge_duplicate_state,
	.atomic_destroy_state		= drm_atomic_helper_bridge_destroy_state,
};

int tidss_encoder_create(struct tidss_device *tidss,
			 struct drm_bridge *next_bridge,
			 u32 encoder_type, u32 possible_crtcs)
{
	struct tidss_encoder *t_enc;
	struct drm_encoder *enc;
	struct drm_connector *connector;
	int ret;

	t_enc = devm_drm_bridge_alloc(tidss->dev, struct tidss_encoder,
				      bridge, &tidss_bridge_funcs);
	if (IS_ERR(t_enc))
		return PTR_ERR(t_enc);

	ret = drm_simple_encoder_init(&tidss->ddev, &t_enc->encoder,
				      encoder_type);
	if (ret)
		return ret;

	t_enc->tidss = tidss;
	t_enc->next_bridge = next_bridge;

	enc = &t_enc->encoder;
	enc->possible_crtcs = possible_crtcs;

	devm_drm_bridge_add(tidss->dev, &t_enc->bridge);

	/* Attaching first bridge to the encoder */

Annotation

Implementation Notes