drm/nouveau/dp: preserve non-pattern bits in DP_TRAINING_PATTERN_SET

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_dp.c b/drivers/gpu/drm/nouveau/nouveau_dp.c
index 7eb841c8ddd9..d3552e766647 100644
--- a/drivers/gpu/drm/nouveau/nouveau_dp.c
+++ b/drivers/gpu/drm/nouveau/nouveau_dp.c
@@ -337,9 +337,16 @@ dp_set_link_config(struct drm_device *dev, struct dp_state *dp)
 static void
 dp_set_training_pattern(struct drm_device *dev, struct dp_state *dp, u8 tp)
 {
+        u8 sink_tp;
+
         NV_DEBUG_KMS(dev, "training pattern %d\n", tp);
+
         nv_mask(dev, NV50_SOR_DP_CTRL(dp->or, dp->link), 0x0f000000, tp << 24);
-        auxch_tx(dev, dp->auxch, 8, DP_TRAINING_PATTERN_SET, &tp, 1);
+
+        auxch_tx(dev, dp->auxch, 9, DP_TRAINING_PATTERN_SET, &sink_tp, 1);
+        sink_tp &= ~DP_TRAINING_PATTERN_MASK;
+        sink_tp |= tp;
+        auxch_tx(dev, dp->auxch, 8, DP_TRAINING_PATTERN_SET, &sink_tp, 1);
 }
 
 static const u8 nv50_lane_map[] = { 16, 8, 0, 24 };