drivers/gpu/drm/nouveau/nvkm/engine/disp/vga.c

File Facts

System

Linux kernel

Corpus path

drivers/gpu/drm/nouveau/nvkm/engine/disp/vga.c

Extension

.c

Size

6449 bytes

Lines

206

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.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• subdev/vga.h

Detected Declarations

• function files
• function nvkm_wrport
• function nvkm_rdvgas
• function nvkm_wrvgas
• function nvkm_rdvgag
• function nvkm_wrvgag
• function nvkm_rdvgac
• function nvkm_wrvgac
• function nvkm_rdvgai
• function nvkm_wrvgai
• function nvkm_lockvgac
• function is
• function nvkm_wrvgaowner

Annotated Snippet

if (device->chipset == 0x11) {
			u32 tied = nvkm_rd32(device, 0x001084) & 0x10000000;
			if (tied == 0) {
				u8 slA = nvkm_rdvgac(device, 0, 0x28) & 0x80;
				u8 tvA = nvkm_rdvgac(device, 0, 0x33) & 0x01;
				u8 slB = nvkm_rdvgac(device, 1, 0x28) & 0x80;
				u8 tvB = nvkm_rdvgac(device, 1, 0x33) & 0x01;
				if (slA && !tvA) return 0x00;
				if (slB && !tvB) return 0x03;
				if (slA) return 0x00;
				if (slB) return 0x03;
				return 0x00;
			}
			return 0x04;
		}

		return nvkm_rdvgac(device, 0, 0x44);
	}

	return 0x00;
}

void
nvkm_wrvgaowner(struct nvkm_device *device, u8 select)
{
	if (device->card_type < NV_50) {
		u8 owner = (select == 1) ? 3 : select;
		if (device->chipset == 0x11) {
			/* workaround hw lockup bug */
			nvkm_rdvgac(device, 0, 0x1f);
			nvkm_rdvgac(device, 1, 0x1f);
		}

		nvkm_wrvgac(device, 0, 0x44, owner);

		if (device->chipset == 0x11) {
			nvkm_wrvgac(device, 0, 0x2e, owner);
			nvkm_wrvgac(device, 0, 0x2e, owner);
		}
	}
}

Annotation

• Immediate include surface: `subdev/vga.h`.
• Detected declarations: `function files`, `function nvkm_wrport`, `function nvkm_rdvgas`, `function nvkm_wrvgas`, `function nvkm_rdvgag`, `function nvkm_wrvgag`, `function nvkm_rdvgac`, `function nvkm_wrvgac`, `function nvkm_rdvgai`, `function nvkm_wrvgai`.
• Atlas domain: Driver Families / drivers/gpu.
• Implementation status: source implementation candidate.

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.