drm/nvd0/disp: dac load detect
VBIOS does more than this, as does nv50/nvc0 driver in nouveau. Traces
of the NVIDIA binary driver however, show pretty much just this being
done... Seems to work for me, it'll be fine for the moment.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nvd0_display.c b/drivers/gpu/drm/nouveau/nvd0_display.c
index 6720d63..f4788d8 100644
--- a/drivers/gpu/drm/nouveau/nvd0_display.c
+++ b/drivers/gpu/drm/nouveau/nvd0_display.c
@@ -685,7 +685,22 @@
static enum drm_connector_status
nvd0_dac_detect(struct drm_encoder *encoder, struct drm_connector *connector)
{
- return connector_status_disconnected;
+ enum drm_connector_status status = connector_status_disconnected;
+ struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
+ struct drm_device *dev = encoder->dev;
+ int or = nv_encoder->or;
+ u32 load;
+
+ nv_wr32(dev, 0x61a00c + (or * 0x800), 0x00100000);
+ udelay(9500);
+ nv_wr32(dev, 0x61a00c + (or * 0x800), 0x80000000);
+
+ load = nv_rd32(dev, 0x61a00c + (or * 0x800));
+ if ((load & 0x38000000) == 0x38000000)
+ status = connector_status_connected;
+
+ nv_wr32(dev, 0x61a00c + (or * 0x800), 0x00000000);
+ return status;
}
static void