drm/amd/display: Always allocate initial connector state state

[ Upstream commit f04bee34d6e35df26cbb2d65e801adfd0d8fe20d ]

[Why]
Unlike our regular connectors, MST connectors don't start off with
an initial connector state. This causes a NULL pointer dereference to
occur when attaching the bpc property since it tries to modify the
connector state.

We need an initial connector state on the connector to avoid the crash.

[How]
Use our reset helper to allocate an initial state and reset the values
to their defaults. We were already doing this before, just not for
MST connectors.

Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Reviewed-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index dac7978f5ee1f91b32b72464189daaf52147c9ff..221de241535a53d43a1db695ba492dedb2fe5d93 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -3644,6 +3644,13 @@ void amdgpu_dm_connector_init_helper(struct amdgpu_display_manager *dm,
 {
        struct amdgpu_device *adev = dm->ddev->dev_private;
 
+       /*
+        * Some of the properties below require access to state, like bpc.
+        * Allocate some default initial connector state with our reset helper.
+        */
+       if (aconnector->base.funcs->reset)
+               aconnector->base.funcs->reset(&aconnector->base);
+
        aconnector->connector_id = link_index;
        aconnector->dc_link = link;
        aconnector->base.interlace_allowed = false;
@@ -3811,9 +3818,6 @@ static int amdgpu_dm_connector_init(struct amdgpu_display_manager *dm,
                        &aconnector->base,
                        &amdgpu_dm_connector_helper_funcs);
 
-       if (aconnector->base.funcs->reset)
-               aconnector->base.funcs->reset(&aconnector->base);
-
        amdgpu_dm_connector_init_helper(
                dm,
                aconnector,