drm/amd/display: fix gamma not being applied correctly
[ Upstream commit 8ce504b9389be846bcdf512ed5be8f661b3bf097 ] [why] Gamma was always being set as identity on SDR monitor, leading to no changes in gamma. This caused nightlight to not apply correctly. [how] Added a default gamma structure to compare against in the sdr case. Signed-off-by: NMurton Liu <murton.liu@amd.com> Reviewed-by: NKrunoslav Kovac <Krunoslav.Kovac@amd.com> Acked-by: NBhawanpreet Lakha <Bhawanpreet.Lakha@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com> Signed-off-by: NSasha Levin <sashal@kernel.org>
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