drm/nouveau/dp: use alternate lane mask for nvaf

Naturally...  Because Macs can't just be the same as everything else
now can they?

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

1 files changed, 10 insertions, 1 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_dp.c b/drivers/gpu/drm/nouveau/nouveau_dp.c
index 55782bd7df0f..7eb841c8ddd9 100644
--- a/drivers/gpu/drm/nouveau/nouveau_dp.c
+++ b/drivers/gpu/drm/nouveau/nouveau_dp.c
@@ -342,16 +342,25 @@ dp_set_training_pattern(struct drm_device *dev, struct dp_state *dp, u8 tp)
         auxch_tx(dev, dp->auxch, 8, DP_TRAINING_PATTERN_SET, &tp, 1);
 }
 
+static const u8 nv50_lane_map[] = { 16, 8, 0, 24 };
+static const u8 nvaf_lane_map[] = { 24, 16, 8, 0 };
+
 static int
 dp_link_train_commit(struct drm_device *dev, struct dp_state *dp)
 {
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
         u32 mask = 0, drv = 0, pre = 0, unk = 0;
-        u8  shifts[4] = { 16, 8, 0, 24 };
         u8  *bios, *last, headerlen;
+        const u8 *shifts;
         int link = dp->link;
         int or = dp->or;
         int i;
 
+        if (dev_priv->chipset != 0xaf)
+                shifts = nv50_lane_map;
+        else
+                shifts = nvaf_lane_map;
+
         bios = nouveau_bios_dp_table(dev, dp->dcb, &headerlen);
         last = bios + headerlen + (bios[4] * 5);
         for (i = 0; i < dp->link_nr; i++) {