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This reverts commit4f1cab2e48. Allowing SCL=0 on platforms with always-on VRR timing generator is causing underruns and other issues on PTL in some cases. SCL still needs to be non-zero in certain scenarios. Revert for now until this is better understood. Fixes:4f1cab2e48("drm/i915/psr: Allow SCL=0 on platforms with always-on VRR TG") Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com> Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com> Link: https://patch.msgid.link/20260622101736.2389991-1-ankit.k.nautiyal@intel.com (cherry picked from commit 4dfcc789a144a21aa9be94f19f928aaa9fdc834d) Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>