Commit 7f017e56 authored by Dave Airlie's avatar Dave Airlie Committed by Christian König
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drm/radeon: don't probe MST on hw we don't support it on

If you do radeon.mst=1 on a gpu without mst hw, and then
plug some mst hw it will oops instead of falling back.

So check we have DCE5 at least before proceeding.
Signed-off-by: default avatarDave Airlie <>
Signed-off-by: default avatarChristian König <>
parent 3bc980bf
......@@ -663,12 +663,17 @@ int
radeon_dp_mst_probe(struct radeon_connector *radeon_connector)
struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
struct drm_device *dev = radeon_connector->;
struct radeon_device *rdev = dev->dev_private;
int ret;
u8 msg[1];
if (!radeon_mst)
return 0;
if (!ASIC_IS_DCE5(rdev))
return 0;
if (dig_connector->dpcd[DP_DPCD_REV] < 0x12)
return 0;
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