drivers/gpu/drm/sun4i/sun4i_layer.c

File Facts

System

Linux kernel

Corpus path

drivers/gpu/drm/sun4i/sun4i_layer.c

Extension

.c

Size

7393 bytes

Lines

263

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.

• 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.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Allocates kernel memory; connect allocation flags and lifetime to context constraints.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• drm/drm_atomic.h
• drm/drm_atomic_helper.h
• drm/drm_blend.h
• drm/drm_gem_atomic_helper.h
• sun4i_backend.h
• sun4i_frontend.h
• sun4i_layer.h
• sunxi_engine.h

Detected Declarations

• function Copyright
• function sun4i_backend_layer_duplicate_state
• function sun4i_backend_layer_destroy_state
• function sun4i_backend_layer_atomic_disable
• function sun4i_backend_layer_atomic_update
• function sun4i_layer_format_mod_supported

Annotated Snippet

if (IS_ERR(layer)) {
			dev_err(drm->dev, "Couldn't initialize %s plane\n",
				i ? "overlay" : "primary");
			return ERR_CAST(layer);
		}

		planes[i] = &layer->plane;
	}

	return planes;
}

Annotation

• Immediate include surface: `drm/drm_atomic.h`, `drm/drm_atomic_helper.h`, `drm/drm_blend.h`, `drm/drm_gem_atomic_helper.h`, `sun4i_backend.h`, `sun4i_frontend.h`, `sun4i_layer.h`, `sunxi_engine.h`.
• Detected declarations: `function Copyright`, `function sun4i_backend_layer_duplicate_state`, `function sun4i_backend_layer_destroy_state`, `function sun4i_backend_layer_atomic_disable`, `function sun4i_backend_layer_atomic_update`, `function sun4i_layer_format_mod_supported`.
• Atlas domain: Driver Families / drivers/gpu.
• Implementation status: source implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.