Commit 7e99a9b2 authored by Ben Skeggs's avatar Ben Skeggs
Browse files

drm/nv50: fix monitor detection on certain chipsets

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: default avatarBen Skeggs <>
parent 07fee3d5
......@@ -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;
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment