drm/amd/display: fix stuck test pattern on right half of display

[why]
With visual confirm enabled, displays where ODM combine is enabled
has a test pattern stuck on the right half of the display even
though the display is unblanked.

[how]
Add a condition to not show the colour ramp test pattern when the
display is unblanked.
Signed-off-by: Zi Yu Liao <ziyu.liao@amd.com>
Reviewed-by: Eric Yang <eric.yang2@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -888,7 +888,7 @@ void dcn20_blank_pixel_data(
 	for (odm_pipe = pipe_ctx->next_odm_pipe; odm_pipe; odm_pipe = odm_pipe->next_odm_pipe) {
 		odm_pipe->stream_res.opp->funcs->opp_set_disp_pattern_generator(
 				odm_pipe->stream_res.opp,
-				dc->debug.visual_confirm != VISUAL_CONFIRM_DISABLE ?
+				dc->debug.visual_confirm != VISUAL_CONFIRM_DISABLE && blank ?
 						CONTROLLER_DP_TEST_PATTERN_COLORRAMP : test_pattern,
 				stream->timing.display_color_depth,
 				&black_color,