drm/i915: Unlock PCH_PP_CONTROL always
Avoid any question about locked registers by just writing the unlock
pattern with every write to the register.
Signed-off-by: NKeith Packard <keithp@keithp.com>
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Avoid any question about locked registers by just writing the unlock
pattern with every write to the register.
Signed-off-by: NKeith Packard <keithp@keithp.com>