drivers/gpu/drm/nouveau/nouveau_bios.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/nouveau/nouveau_bios.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/nouveau/nouveau_bios.c
Extension
.c
Size
61282 bytes
Lines
2153
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 lvdstableheader {
	uint8_t lvds_ver, headerlen, recordlen;
};

static int parse_lvds_manufacturer_table_header(struct drm_device *dev, struct nvbios *bios, struct lvdstableheader *lth)
{
	/*
	 * BMP version (0xa) LVDS table has a simple header of version and
	 * record length. The BIT LVDS table has the typical BIT table header:
	 * version byte, header length byte, record length byte, and a byte for
	 * the maximum number of records that can be held in the table.
	 */

	struct nouveau_drm *drm = nouveau_drm(dev);
	uint8_t lvds_ver, headerlen, recordlen;

	memset(lth, 0, sizeof(struct lvdstableheader));

	if (bios->fp.lvdsmanufacturerpointer == 0x0) {
		NV_ERROR(drm, "Pointer to LVDS manufacturer table invalid\n");
		return -EINVAL;
	}

	lvds_ver = bios->data[bios->fp.lvdsmanufacturerpointer];

	switch (lvds_ver) {
	case 0x0a:	/* pre NV40 */
		headerlen = 2;
		recordlen = bios->data[bios->fp.lvdsmanufacturerpointer + 1];
		break;
	case 0x30:	/* NV4x */
		headerlen = bios->data[bios->fp.lvdsmanufacturerpointer + 1];
		if (headerlen < 0x1f) {
			NV_ERROR(drm, "LVDS table header not understood\n");
			return -EINVAL;
		}
		recordlen = bios->data[bios->fp.lvdsmanufacturerpointer + 2];
		break;
	case 0x40:	/* G80/G90 */
		headerlen = bios->data[bios->fp.lvdsmanufacturerpointer + 1];
		if (headerlen < 0x7) {
			NV_ERROR(drm, "LVDS table header not understood\n");
			return -EINVAL;
		}
		recordlen = bios->data[bios->fp.lvdsmanufacturerpointer + 2];
		break;
	default:
		NV_ERROR(drm,
			 "LVDS table revision %d.%d not currently supported\n",
			 lvds_ver >> 4, lvds_ver & 0xf);
		return -ENOSYS;
	}

	lth->lvds_ver = lvds_ver;
	lth->headerlen = headerlen;
	lth->recordlen = recordlen;

	return 0;
}

static int
get_fp_strap(struct drm_device *dev, struct nvbios *bios)
{
	struct nouveau_drm *drm = nouveau_drm(dev);
	struct nvif_object *device = &drm->client.device.object;

	/*
	 * The fp strap is normally dictated by the "User Strap" in
	 * PEXTDEV_BOOT_0[20:16], but on BMP cards when bit 2 of the
	 * Internal_Flags struct at 0x48 is set, the user strap gets overriden
	 * by the PCI subsystem ID during POST, but not before the previous user
	 * strap has been committed to CR58 for CR57=0xf on head A, which may be
	 * read and used instead
	 */

	if (bios->major_version < 5 && bios->data[0x48] & 0x4)
		return NVReadVgaCrtc5758(dev, 0, 0xf) & 0xf;

	if (drm->client.device.info.family >= NV_DEVICE_INFO_V0_MAXWELL)
		return nvif_rd32(device, 0x001800) & 0x0000000f;
	else
	if (drm->client.device.info.family >= NV_DEVICE_INFO_V0_TESLA)
		return (nvif_rd32(device, NV_PEXTDEV_BOOT_0) >> 24) & 0xf;
	else
		return (nvif_rd32(device, NV_PEXTDEV_BOOT_0) >> 16) & 0xf;
}

static int parse_fp_mode_table(struct drm_device *dev, struct nvbios *bios)
{
	struct nouveau_drm *drm = nouveau_drm(dev);

Annotation

Implementation Notes