drm/amd/display: Allow DCN301 to clear update flags

commit 2d418e4 upstream.

[Why & How]
Not letting DCN301 to clear after surface/stream update results
in artifacts when switching between active overlay planes. The issue
is known and has been solved initially. See below:
(https://gitlab.freedesktop.org/drm/amd/-/issues/3441)

Fixes: f354556 ("drm/amd/display: limit clear_update_flags t dcn32 and above")
Reviewed-by: Mario Limonciello <[email protected]>
Signed-off-by: Ivan Lipski <[email protected]>
Tested-by: Daniel Wheeler <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: Ivan Lipski

drivers/gpu/drm/amd/display/dc/core/dc.c

@@ -5439,7 +5439,8 @@ bool dc_update_planes_and_stream(struct dc *dc,
 	else
 		ret = update_planes_and_stream_v2(dc, srf_updates,
 			surface_count, stream, stream_update);
-	if (ret && dc->ctx->dce_version >= DCN_VERSION_3_2)
+	if (ret && (dc->ctx->dce_version >= DCN_VERSION_3_2 ||
+		dc->ctx->dce_version == DCN_VERSION_3_01))
 		clear_update_flags(srf_updates, surface_count, stream);
 
 	return ret;