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drm/nv50: ignore vbios table's claim to the contrary if EDID says >8bpc 

Should fix dim panel issues reported on Dell M6400/M6500.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2009-12-21 12:16:52 +10:00 committed by Dave Airlie
parent aeca15e596
commit fbe36a7a06
1 changed files with 17 additions and 0 deletions
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17
drivers/gpu/drm/nouveau/nv50_display.c
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@ -690,9 +690,21 @@ nv50_display_script_select(struct drm_device *dev, struct dcb_entry *dcbent,
int pxclk)
{
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct nouveau_connector *nv_connector = NULL;
struct drm_encoder *encoder;
struct nvbios *bios = &dev_priv->VBIOS;
uint32_t mc, script = 0, or;
list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
if (nv_encoder->dcb != dcbent)
continue;
nv_connector = nouveau_encoder_connector_get(nv_encoder);
break;
}
or = ffs(dcbent->or) - 1;
mc = nv50_display_mode_ctrl(dev, dcbent->type != OUTPUT_ANALOG, or);
switch (dcbent->type) {
@ -711,6 +723,11 @@ nv50_display_script_select(struct drm_device *dev, struct dcb_entry *dcbent,
} else
if (bios->fp.strapless_is_24bit & 1)
script |= 0x0200;
if (nv_connector && nv_connector->edid &&
(nv_connector->edid->revision >= 4) &&
(nv_connector->edid->input & 0x70) >= 0x20)
script |= 0x0200;
}
if (nouveau_uscript_lvds >= 0) {