drm/amd/display: Set test_pattern_changed update flag on pipe enable

[Why]
In certain cases, ODM pipe split can occur while stream already has test
pattern enabled. The new pipe used in the ODM combine config must be
configured to output the test pattern in this case.

[How]
If the stream is configured to output test pattern, then set the
test_pattern_changed update flag for the new pipe when it gets enabled.
Reviewed-by: Alvin Lee <alvin.lee2@amd.com>
Acked-by: Wayne Lin <wayne.lin@amd.com>
Signed-off-by: George Shen <george.shen@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/hwss/dcn20/dcn20_hwseq.c

@@ -1400,6 +1400,10 @@ static void dcn20_detect_pipe_changes(struct pipe_ctx *old_pipe, struct pipe_ctx
 		new_pipe->update_flags.bits.scaler = 1;
 		new_pipe->update_flags.bits.viewport = 1;
 		new_pipe->update_flags.bits.det_size = 1;
+		if (new_pipe->stream->test_pattern.type != DP_TEST_PATTERN_VIDEO_MODE &&
+				new_pipe->stream_res.test_pattern_params.width != 0 &&
+				new_pipe->stream_res.test_pattern_params.height != 0)
+			new_pipe->update_flags.bits.test_pattern_changed = 1;
 		if (!new_pipe->top_pipe && !new_pipe->prev_odm_pipe) {
 			new_pipe->update_flags.bits.odm = 1;
 			new_pipe->update_flags.bits.global_sync = 1;