drm/i915: Avoid race of intel_crt_detect_hotplug() with HPD interrupt, v2
An HPD interrupt may fire while we are in a function that changes the PORT_HOTPLUG_EN register - especially when an HPD interrupt storm occurs. Since the interrupt handler changes the enabled HPD lines when it detects such a storm the read-modify-write cycles may interfere. To avoid this, shiled the rmw cycles with IRQ save spinlocks. Changes since v1: - Implement a function which takes care of accessing PORT_HOTPLUG_EN. Signed-off-by: Egbert Eich <eich@suse.de> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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