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 3880ddf1c820fd0e6a3c8eab416f5282a6a5ea0d..43173a1f99d0f88def54a01e0b1a61840a90f142 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
@@ -246,7 +246,7 @@ 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)