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Originally added in commit 1f84e550a870 ("drm/i915 more registers for
S3 (DSPCLK_GATE_D, CACHE_MODE_0, MI_ARB_STATE)") to fix some underruns.
I suspect that was due to the trickle feed settings getting clobbered
during suspend. We've been disabling trickle feed explicitly since
commit 20f949670f51 ("drm/i915: Disable trickle feed via MI_ARB_STATE
for the gen4") so this magic save/restore should no longer be needed.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200908140210.31048-3-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>