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drm/nouveau: fix required mode bandwidth calculation for DP

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This should fix eDP on certain laptops with 18-bit panels, we were rejecting
the panel's native mode due to thinking there was insufficient bandwidth
for it.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2010-09-28 10:23:20 +10:00
parent 85341f27b4
commit 62acdc71cf
2 changed files with 20 additions and 1 deletions
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18
drivers/gpu/drm/nouveau/nouveau_connector.c
View file

@ -76,6 +76,22 @@ nouveau_encoder_connector_get(struct nouveau_encoder *encoder)
return NULL;
}
/*TODO: This could use improvement, and learn to handle the fixed
* BIOS tables etc. It's fine currently, for its only user.
*/
int
nouveau_connector_bpp(struct drm_connector *connector)
{
struct nouveau_connector *nv_connector = nouveau_connector(connector);
if (nv_connector->edid && nv_connector->edid->revision >= 4) {
u8 bpc = ((nv_connector->edid->input & 0x70) >> 3) + 4;
if (bpc > 4)
return bpc;
}
return 18;
}
static void
nouveau_connector_destroy(struct drm_connector *drm_connector)
@ -666,7 +682,7 @@ nouveau_connector_mode_valid(struct drm_connector *connector,
else
max_clock = nv_encoder->dp.link_nr * 162000;
clock *= 3;
clock = clock * nouveau_connector_bpp(connector) / 8;
break;
default:
BUG_ON(1);

3
drivers/gpu/drm/nouveau/nouveau_connector.h
View file

@ -55,4 +55,7 @@ nouveau_connector_create(struct drm_device *, int index);
void
nouveau_connector_set_polling(struct drm_connector *);
int
nouveau_connector_bpp(struct drm_connector *);
#endif /* __NOUVEAU_CONNECTOR_H__ */