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drm/amd/display: Add DSCL memory low power support
[Why]
The DSCL memory blocks should be powered down when they're not in use.
This will reduce power consumption.
[How]
1. Write to DSCL_MEM_PWR_FORCE to put memory to shutdown when DSCL is not
used.
2. Added a debug option to allow this behaviour to be turned off
Signed-off-by: Jacky Liao <ziyu.liao@amd.com>
Reviewed-by: Eric Yang <eric.yang2@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>