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| author | Dave Airlie <airlied@redhat.com> | 2015-06-18 14:29:18 +1000 |
|---|---|---|
| committer | Christian König <christian.koenig@amd.com> | 2015-06-18 20:36:56 +0200 |
| commit | 7f017e56770e82c8fe2d4d8c59e58f519f455ad7 (patch) | |
| tree | 760f4476788856c7f20fcafc14a1d12db2761f91 | |
| parent | 3bc980bf19bb62007e923691fa2869ba113be895 (diff) | |
| download | linux-7f017e56770e82c8fe2d4d8c59e58f519f455ad7.tar.bz2 | |
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>
| -rw-r--r-- | drivers/gpu/drm/radeon/radeon_dp_mst.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_dp_mst.c b/drivers/gpu/drm/radeon/radeon_dp_mst.c index 2b98ed3e684d..257b10be5cda 100644 --- a/drivers/gpu/drm/radeon/radeon_dp_mst.c +++ b/drivers/gpu/drm/radeon/radeon_dp_mst.c @@ -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; |