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DDR DVFS tuning has found that several power-saving features don't have good tradeoffs at higher frequencies -- at higher frequencies, we'll see glitches or other errors. Provide tuning controls so these can be disabled at higher OPPs, and left active only at the lower ones. Signed-off-by: Brian Norris <briannorris@chromium.org> Reviewed-by: Rob Herring <robh@kernel.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>