drm/nouveau/dp: account for channel coding overhead in link training

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
git-mirror · Mar 13, 2012 · 6860dc8 · 6860dc8
1 parent c674844
commit 6860dc8
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/drivers/gpu/drm/nouveau/nouveau_dp.c b/drivers/gpu/drm/nouveau/nouveau_dp.c
@@ -422,6 +422,9 @@ nouveau_dp_link_train(struct drm_encoder *encoder, u32 datarate,
 	dp.auxch = auxch->drive;
 	dp.dpcd = nv_encoder->dp.dpcd;
 
+	/* adjust required bandwidth for 8B/10B coding overhead */
+	datarate = (datarate / 8) * 10;
+
 	/* some sinks toggle hotplug in response to some of the actions
 	 * we take during link training (DP_SET_POWER is one), we need
 	 * to ignore them for the moment to avoid races.