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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 <airlied@redhat.com>
Signed-off-by: default avatarChristian König <christian.koenig@amd.com>
parent 3bc980bf

drivers/gpu/drm/radeon/radeon_dp_mst.c

+5 −0
Original line number Diff line number Diff line
@@ -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->base.dev;

	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;