drivers/gpu/drm/exynos/exynos_drm_dpi.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/exynos/exynos_drm_dpi.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/exynos/exynos_drm_dpi.c
Extension
.c
Size
5562 bytes
Lines
250
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 exynos_dpi {
	struct drm_encoder encoder;
	struct device *dev;
	struct device_node *panel_node;

	struct drm_panel *panel;
	struct drm_connector connector;

	struct videomode *vm;
};

#define connector_to_dpi(c) container_of(c, struct exynos_dpi, connector)

static inline struct exynos_dpi *encoder_to_dpi(struct drm_encoder *e)
{
	return container_of(e, struct exynos_dpi, encoder);
}

static enum drm_connector_status
exynos_dpi_detect(struct drm_connector *connector, bool force)
{
	return connector_status_connected;
}

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

static const struct drm_connector_funcs exynos_dpi_connector_funcs = {
	.detect = exynos_dpi_detect,
	.fill_modes = drm_helper_probe_single_connector_modes,
	.destroy = exynos_dpi_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 int exynos_dpi_get_modes(struct drm_connector *connector)
{
	struct exynos_dpi *ctx = connector_to_dpi(connector);

	/* fimd timings gets precedence over panel modes */
	if (ctx->vm) {
		struct drm_display_mode *mode;

		mode = drm_mode_create(connector->dev);
		if (!mode) {
			DRM_DEV_ERROR(ctx->dev,
				      "failed to create a new display mode\n");
			return 0;
		}
		drm_display_mode_from_videomode(ctx->vm, mode);
		mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
		drm_mode_probed_add(connector, mode);
		return 1;
	}

	if (ctx->panel)
		return drm_panel_get_modes(ctx->panel, connector);

	return 0;
}

static const struct drm_connector_helper_funcs exynos_dpi_connector_helper_funcs = {
	.get_modes = exynos_dpi_get_modes,
};

static int exynos_dpi_create_connector(struct drm_encoder *encoder)
{
	struct exynos_dpi *ctx = encoder_to_dpi(encoder);
	struct drm_connector *connector = &ctx->connector;
	int ret;

	connector->polled = DRM_CONNECTOR_POLL_HPD;

	ret = drm_connector_init(encoder->dev, connector,
				 &exynos_dpi_connector_funcs,
				 DRM_MODE_CONNECTOR_DPI);
	if (ret) {
		DRM_DEV_ERROR(ctx->dev,
			      "failed to initialize connector with drm\n");
		return ret;
	}

	drm_connector_helper_add(connector, &exynos_dpi_connector_helper_funcs);
	drm_connector_attach_encoder(connector, encoder);

	return 0;

Annotation

Implementation Notes