[PATCH 5.10 636/717] drm/amdgpu: only set DP subconnector type on DP and eDP connectors

Greg Kroah-Hartman
2020-12-28T14:39:37Z

From: Alex Deucher <alexander.deucher@amd.com>

commit 05211e7fbbf042dd7f51155ebe64eb2ecacb25cb upstream.

Fixes a crash in drm_object_property_set_value() because the property
is not set for internal DP ports that connect to a bridge chips
(e.g., DP to VGA or DP to LVDS).

Bug: https://bugzilla.kernel.org/show_bug.cgi?id=210739
Fixes: 65bf2cf95d3ade ("drm/amdgpu: utilize subconnector property for DP through atombios")
Tested-By: Kris Karas <bugs-a17@moonlit-rail.com>
Cc: Oleg Vasilev <oleg.vasilev@intel.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org # 5.10.x
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)

--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c
@@ -1414,10 +1414,12 @@ out:
pm_runtime_put_autosuspend(connector->dev->dev);
}

- drm_dp_set_subconnector_property(&amdgpu_connector->base,
- ret,
- amdgpu_dig_connector->dpcd,
- amdgpu_dig_connector->downstream_ports);
+ if (connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort ||
+ connector->connector_type == DRM_MODE_CONNECTOR_eDP)
+ drm_dp_set_subconnector_property(&amdgpu_connector->base,
+ ret,
+ amdgpu_dig_connector->dpcd,
+ amdgpu_dig_connector->downstream_ports);
return ret;
}