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

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Date:   Mon, 28 Dec 2020 13:50:34 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Kris Karas <bugs-a17@...nlit-rail.com>,
        Oleg Vasilev <oleg.vasilev@...el.com>,
        Alex Deucher <alexander.deucher@....com>
Subject: [PATCH 5.10 636/717] drm/amdgpu: only set DP subconnector type on DP and eDP connectors

From: Alex Deucher <alexander.deucher@....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@...nlit-rail.com>
Cc: Oleg Vasilev <oleg.vasilev@...el.com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Cc: stable@...r.kernel.org # 5.10.x
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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;
 }