drm/i915: Grab modeset locks for GPU rest on pre-ctg
On gen4 and earlier the GPU reset also resets the display, so we should protect against concurrent modeset operations. Grab all the modeset locks around the entire GPU reset dance, remebering first ti dislogde any pending page flip to make sure we don't deadlock. Any pageflip coming in between these two steps should fail anyway due to reset_in_progress, so this should be safe. This fixes a lot of failed asserts in the modeset code when there's a modeset racing with the reset. Naturally the asserts aren't happy when the expected state has disappeared. v2: Drop UMS checks, complete pending flips after the reset (Daniel) Cc: Daniel Vetter <daniel@ffwll.ch> Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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