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Commit 62acdc71 authored by Ben Skeggs's avatar Ben Skeggs
Browse files

drm/nouveau: fix required mode bandwidth calculation for DP 



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: default avatarBen Skeggs <bskeggs@redhat.com>
parent 85341f27

drivers/gpu/drm/nouveau/nouveau_connector.c

+17 −1
Original line number Diff line number Diff line
@@ -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);

drivers/gpu/drm/nouveau/nouveau_connector.h

+3 −0
Original line number Diff line number Diff line
@@ -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__ */