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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: Dave Airlie <airlied@redhat.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
This commit is contained in:
Dave Airlie 2015-06-18 14:29:18 +10:00 committed by Christian König
parent 3bc980bf19
commit 7f017e5677
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/radeon/radeon_dp_mst.c
View File

@ -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;