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drm/nv50: fix monitor detection on certain chipsets

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There appears to be some kind of switch on certain chips to control whether
the DP auxch or traditional i2c bus will be operational on a connector,
this commit hopefully fixes nouveau to do the right thing.

Likely only relevent on chips with DP outputs.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2010-04-24 03:53:14 +10:00
parent 07fee3d561
commit 7e99a9b2b5
1 changed files with 16 additions and 5 deletions
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21
drivers/gpu/drm/nouveau/nouveau_i2c.c
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@ -254,16 +254,27 @@ struct nouveau_i2c_chan *
nouveau_i2c_find(struct drm_device *dev, int index)
{
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct nvbios *bios = &dev_priv->vbios;
struct dcb_i2c_entry *i2c = &dev_priv->vbios.dcb.i2c[index];
if (index >= DCB_MAX_NUM_I2C_ENTRIES)
return NULL;
if (!bios->dcb.i2c[index].chan) {
if (nouveau_i2c_init(dev, &bios->dcb.i2c[index], index))
return NULL;
if (dev_priv->chipset >= NV_50 && (i2c->entry & 0x00000100)) {
uint32_t reg = 0xe500, val;
if (i2c->port_type == 6) {
reg += i2c->read * 0x50;
val = 0x2002;
} else {
reg += ((i2c->entry & 0x1e00) >> 9) * 0x50;
val = 0xe001;
}
nv_wr32(dev, reg, (nv_rd32(dev, reg) & ~0xf003) | val);
}
return bios->dcb.i2c[index].chan;
if (!i2c->chan && nouveau_i2c_init(dev, i2c, index))
return NULL;
return i2c->chan;
}