Commit fbe36a7a authored by Ben Skeggs's avatar Ben Skeggs Committed by Dave Airlie
Browse files

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: default avatarBen Skeggs <bskeggs@redhat.com>
parent aeca15e5

drivers/gpu/drm/nouveau/nv50_display.c

+17 −0
Original line number Diff line number Diff line
@@ -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) {