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drm/nouveau: assume no nv04 board has a DCB table

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There's a report of a TNT2 where the DCB table pointer is *not* NULL
(it contains a part of a VBIOS data string), and we assume this means
a DCB table is present, causing all kinds of hilarity.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2010-01-14 15:58:10 +10:00
parent 77cb5c75e8
commit ed42f8240c
1 changed files with 12 additions and 8 deletions
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20
drivers/gpu/drm/nouveau/nouveau_bios.c
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@ -5523,11 +5523,13 @@ void merge_like_dcb_entries(struct drm_device *dev, struct parsed_dcb *dcb)
dcb->entries = newentries;
}
static int parse_dcb_table(struct drm_device *dev, struct nvbios *bios, bool twoHeads)
static int
parse_dcb_table(struct drm_device *dev, struct nvbios *bios, bool twoHeads)
{
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct bios_parsed_dcb *bdcb = &bios->bdcb;
struct parsed_dcb *dcb;
uint16_t dcbptr, i2ctabptr = 0;
uint16_t dcbptr = 0, i2ctabptr = 0;
uint8_t *dcbtable;
uint8_t headerlen = 0x4, entries = DCB_MAX_NUM_ENTRIES;
bool configblock = true;
@ -5538,16 +5540,18 @@ static int parse_dcb_table(struct drm_device *dev, struct nvbios *bios, bool two
dcb->entries = 0;
/* get the offset from 0x36 */
dcbptr = ROM16(bios->data[0x36]);
if (dev_priv->card_type > NV_04) {
dcbptr = ROM16(bios->data[0x36]);
if (dcbptr == 0x0000)
NV_WARN(dev, "No output data (DCB) found in BIOS\n");
}
/* this situation likely means a really old card, pre DCB */
if (dcbptr == 0x0) {
NV_WARN(dev, "No output data (DCB) found in BIOS, "
"assuming a CRT output exists\n");
/* this situation likely means a really old card, pre DCB */
NV_INFO(dev, "Assuming a CRT output exists\n");
fabricate_vga_output(dcb, LEGACY_I2C_CRT, 1);
if (nv04_tv_identify(dev,
bios->legacy.i2c_indices.tv) >= 0)
if (nv04_tv_identify(dev, bios->legacy.i2c_indices.tv) >= 0)
fabricate_tv_output(dcb, twoHeads);
return 0;