drm/amd/display: check if REFCLK_CNTL register is present
[ Upstream commit 3159d41d ] Check before programming the register since it isn't present on all IPs using this code. Signed-off-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com> Reviewed-by: Eric Bernstein <Eric.Bernstein@amd.com> Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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