drivers/gpu/drm/nouveau/nvkm/subdev/bios/conn.c

File Facts

System

Linux kernel

Corpus path

drivers/gpu/drm/nouveau/nvkm/subdev/bios/conn.c

Extension

.c

Size

3151 bytes

Lines

98

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/bios.h
• subdev/bios/dcb.h
• subdev/bios/conn.h

Detected Declarations

• function files
• function nvbios_connTp
• function nvbios_connEe
• function nvbios_connEp

Annotated Snippet

if (data) {
			*ver = nvbios_rd08(bios, data + 0);
			*hdr = nvbios_rd08(bios, data + 1);
			*cnt = nvbios_rd08(bios, data + 2);
			*len = nvbios_rd08(bios, data + 3);
			return data;
		}
	}
	return 0x00000000;
}

u32
nvbios_connTp(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
	      struct nvbios_connT *info)
{
	u32 data = nvbios_connTe(bios, ver, hdr, cnt, len);
	memset(info, 0x00, sizeof(*info));
	switch (!!data * *ver) {
	case 0x30:
	case 0x40:
		return data;
	default:
		break;
	}
	return 0x00000000;
}

u32
nvbios_connEe(struct nvkm_bios *bios, u8 idx, u8 *ver, u8 *len)
{
	u8  hdr, cnt;
	u32 data = nvbios_connTe(bios, ver, &hdr, &cnt, len);
	if (data && idx < cnt)
		return data + hdr + (idx * *len);
	return 0x00000000;
}

u32
nvbios_connEp(struct nvkm_bios *bios, u8 idx, u8 *ver, u8 *len,
	      struct nvbios_connE *info)
{
	u32 data = nvbios_connEe(bios, idx, ver, len);
	memset(info, 0x00, sizeof(*info));
	switch (!!data * *ver) {
	case 0x30:
	case 0x40:
		info->type     =  nvbios_rd08(bios, data + 0x00);
		info->location =  nvbios_rd08(bios, data + 0x01) & 0x0f;
		info->hpd      = (nvbios_rd08(bios, data + 0x01) & 0x30) >> 4;
		info->dp       = (nvbios_rd08(bios, data + 0x01) & 0xc0) >> 6;
		if (*len < 4)
			return data;
		info->hpd     |= (nvbios_rd08(bios, data + 0x02) & 0x03) << 2;
		info->dp      |=  nvbios_rd08(bios, data + 0x02) & 0x0c;
		info->di       = (nvbios_rd08(bios, data + 0x02) & 0xf0) >> 4;
		info->hpd     |= (nvbios_rd08(bios, data + 0x03) & 0x07) << 4;
		info->sr       = (nvbios_rd08(bios, data + 0x03) & 0x08) >> 3;
		info->lcdid    = (nvbios_rd08(bios, data + 0x03) & 0x70) >> 4;
		return data;
	default:
		break;
	}
	return 0x00000000;
}

Annotation

• Immediate include surface: `subdev/bios.h`, `subdev/bios/dcb.h`, `subdev/bios/conn.h`.
• Detected declarations: `function files`, `function nvbios_connTp`, `function nvbios_connEe`, `function nvbios_connEp`.
• 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.