drm/i915/gt: Reapply ppgtt enabling after engine resets
The GFX_MODE is reset along with the engine, turning off ppGTT. We need to re-enable it upon resume afterwards. Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Reviewed-by: NMika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20210114101451.24762-1-chris@chris-wilson.co.uk
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