drm/amd/display: Block 3D Timings

- we don't yet support 3D timings in DAL3
- somehow a code path was being executed that resulted in HW programming
for a 3D timing, which caused 3D displays to show half the desktop in one
frame, and the other half of the desktop in the next frame
- blocking all 3D timings in timing generator validation until we
implement proper 3D timing support
Signed-off-by: NJoshua Aberback <Joshua.Aberback@amd.com>
Reviewed-by: NTony Cheng <Tony.Cheng@amd.com>
Acked-by: NHarry Wentland <Harry.Wentland@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dce110/dce110_timing_generator.c

@@ -1113,6 +1113,10 @@ bool dce110_timing_generator_validate_timing(
 	if (!timing)
 		return false;
 
+	/* Currently we don't support 3D, so block all 3D timings */
+	if (timing->timing_3d_format != TIMING_3D_FORMAT_NONE)
+		return false;
+
 	/* Check maximum number of pixels supported by Timing Generator
 	 * (Currently will never fail, in order to fail needs display which
 	 * needs more than 8192 horizontal and