drm/amd/display: Fix Synaptics Cascaded Panamera DSC Determination

commit 4437936c6b696b98f3fe1d8679a2788c41b4df77 upstream.

Synaptics Cascaded Panamera topology needs to unconditionally
acquire root aux for dsc decoding.

Reviewed-by: Roman Li <roman.li@amd.com>
Signed-off-by: Fangzhi Zuo <Jerry.Zuo@amd.com>
Signed-off-by: Zaeem Mohamed <zaeem.mohamed@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: Mario Limonciello <superm1@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
index b50010ed76332725bc2c60a5f2c0ebef847f190d..8b2da505834ee5c197011c16e1269c182a27f71f 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
@@ -251,7 +251,7 @@ static bool validate_dsc_caps_on_connector(struct amdgpu_dm_connector *aconnecto
                aconnector->dsc_aux = &aconnector->mst_root->dm_dp_aux.aux;
 
        /* synaptics cascaded MST hub case */
-       if (!aconnector->dsc_aux && is_synaptics_cascaded_panamera(aconnector->dc_link, port))
+       if (is_synaptics_cascaded_panamera(aconnector->dc_link, port))
                aconnector->dsc_aux = port->mgr->aux;
 
        if (!aconnector->dsc_aux)