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drm/nv50: DCB quirk for Dell M6300 

Uncertain if this is a weirdo configuration, or a BIOS bug.  If it's not
a BIOS bug, we still don't know how to make it work anyway so ignore a
"conflicting" DCB entry to prevent a display hang.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2010-07-01 11:31:45 +10:00
parent 7149eee87a
commit df4cf1b72d
1 changed files with 28 additions and 0 deletions
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28
drivers/gpu/drm/nouveau/nouveau_bios.c
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@ -5841,6 +5841,31 @@ void merge_like_dcb_entries(struct drm_device *dev, struct dcb_table *dcb)
dcb->entries = newentries;
}
static bool
apply_dcb_encoder_quirks(struct drm_device *dev, int idx, u32 *conn, u32 *conf)
{
/* Dell Precision M6300
* DCB entry 2: 02025312 00000010
* DCB entry 3: 02026312 00000020
*
* Identical, except apparently a different connector on a
* different SOR link. Not a clue how we're supposed to know
* which one is in use if it even shares an i2c line...
*
* Ignore the connector on the second SOR link to prevent
* nasty problems until this is sorted (assuming it's not a
* VBIOS bug).
*/
if ((dev->pdev->device == 0x040d) &&
(dev->pdev->subsystem_vendor == 0x1028) &&
(dev->pdev->subsystem_device == 0x019b)) {
if (*conn == 0x02026312 && *conf == 0x00000020)
return false;
}
return true;
}
static int
parse_dcb_table(struct drm_device *dev, struct nvbios *bios, bool twoHeads)
{
@ -5974,6 +5999,9 @@ parse_dcb_table(struct drm_device *dev, struct nvbios *bios, bool twoHeads)
if ((connection & 0x0000000f) == 0x0000000f)
continue;
if (!apply_dcb_encoder_quirks(dev, i, &connection, &config))
continue;
NV_TRACEWARN(dev, "Raw DCB entry %d: %08x %08x\n",
dcb->entries, connection, config);