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

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/nouveau/nvkm/subdev/bios/dp.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/nouveau/nvkm/subdev/bios/dp.c
Extension
.c
Size
6321 bytes
Lines
233
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

if (d.version == 1 && d.length >= 2) {
			u16 data = nvbios_rd16(bios, d.offset);
			if (data) {
				*ver = nvbios_rd08(bios, data + 0x00);
				switch (*ver) {
				case 0x20:
				case 0x21:
				case 0x30:
				case 0x40:
				case 0x41:
				case 0x42:
					*hdr = nvbios_rd08(bios, data + 0x01);
					*len = nvbios_rd08(bios, data + 0x02);
					*cnt = nvbios_rd08(bios, data + 0x03);
					return data;
				default:
					break;
				}
			}
		}
	}

	return 0x0000;
}

static u16
nvbios_dpout_entry(struct nvkm_bios *bios, u8 idx,
		   u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
{
	u16 data = nvbios_dp_table(bios, ver, hdr, cnt, len);
	if (data && idx < *cnt) {
		u16 outp = nvbios_rd16(bios, data + *hdr + idx * *len);
		switch (*ver * !!outp) {
		case 0x20:
		case 0x21:
		case 0x30:
			*hdr = nvbios_rd08(bios, data + 0x04);
			*len = nvbios_rd08(bios, data + 0x05);
			*cnt = nvbios_rd08(bios, outp + 0x04);
			break;
		case 0x40:
		case 0x41:
		case 0x42:
			*hdr = nvbios_rd08(bios, data + 0x04);
			*cnt = 0;
			*len = 0;
			break;
		default:
			break;
		}
		return outp;
	}
	*ver = 0x00;
	return 0x0000;
}

u16
nvbios_dpout_parse(struct nvkm_bios *bios, u8 idx,
		   u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
		   struct nvbios_dpout *info)
{
	u16 data = nvbios_dpout_entry(bios, idx, ver, hdr, cnt, len);
	memset(info, 0x00, sizeof(*info));
	if (data && *ver) {
		info->type = nvbios_rd16(bios, data + 0x00);
		info->mask = nvbios_rd16(bios, data + 0x02);
		switch (*ver) {
		case 0x20:
			info->mask |= 0x00c0; /* match any link */
			fallthrough;
		case 0x21:
		case 0x30:
			info->flags     = nvbios_rd08(bios, data + 0x05);
			info->script[0] = nvbios_rd16(bios, data + 0x06);
			info->script[1] = nvbios_rd16(bios, data + 0x08);
			if (*len >= 0x0c)
				info->lnkcmp    = nvbios_rd16(bios, data + 0x0a);
			if (*len >= 0x0f) {
				info->script[2] = nvbios_rd16(bios, data + 0x0c);
				info->script[3] = nvbios_rd16(bios, data + 0x0e);
			}
			if (*len >= 0x11)
				info->script[4] = nvbios_rd16(bios, data + 0x10);
			break;
		case 0x40:
		case 0x41:
		case 0x42:
			info->flags     = nvbios_rd08(bios, data + 0x04);
			info->script[0] = nvbios_rd16(bios, data + 0x05);
			info->script[1] = nvbios_rd16(bios, data + 0x07);

Annotation

Implementation Notes