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drm/nouveau: Try to fetch an EDID from OF if DDC fails.

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More Apple brain damage, it fixes the modesetting failure on an eMac
G4 (fdo bug 29810).

Reported-by: Zoltan Varnagy <doi@freemail.hu>
Signed-off-by: Francisco Jerez <currojerez@riseup.net>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Francisco Jerez 2010-09-09 14:33:17 +02:00 committed by Ben Skeggs
parent 9f56b1265d
commit c16c570762
1 changed files with 36 additions and 0 deletions
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36
drivers/gpu/drm/nouveau/nouveau_connector.c
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@ -130,6 +130,36 @@ nouveau_connector_ddc_detect(struct drm_connector *connector,
return NULL;
}
static struct nouveau_encoder *
nouveau_connector_of_detect(struct drm_connector *connector)
{
#ifdef __powerpc__
struct drm_device *dev = connector->dev;
struct nouveau_connector *nv_connector = nouveau_connector(connector);
struct nouveau_encoder *nv_encoder;
struct device_node *cn, *dn = pci_device_to_OF_node(dev->pdev);
if (!dn ||
!((nv_encoder = find_encoder_by_type(connector, OUTPUT_TMDS)) ||
(nv_encoder = find_encoder_by_type(connector, OUTPUT_ANALOG))))
return NULL;
for_each_child_of_node(dn, cn) {
const char *name = of_get_property(cn, "name", NULL);
const void *edid = of_get_property(cn, "EDID", NULL);
int idx = name ? name[strlen(name) - 1] - 'A' : 0;
if (nv_encoder->dcb->i2c_index == idx && edid) {
nv_connector->edid =
kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
of_node_put(cn);
return nv_encoder;
}
}
#endif
return NULL;
}
static void
nouveau_connector_set_encoder(struct drm_connector *connector,
struct nouveau_encoder *nv_encoder)
@ -225,6 +255,12 @@ nouveau_connector_detect(struct drm_connector *connector, bool force)
return connector_status_connected;
}
nv_encoder = nouveau_connector_of_detect(connector);
if (nv_encoder) {
nouveau_connector_set_encoder(connector, nv_encoder);
return connector_status_connected;
}
detect_analog:
nv_encoder = find_encoder_by_type(connector, OUTPUT_ANALOG);
if (!nv_encoder && !nouveau_tv_disable)