drm/i915: clear crt hotplug compare voltage field before setting

Noticed while reviewing the hotplug irq setup code. Just looks better.

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_irq.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -2775,6 +2775,7 @@ static void i915_hpd_irq_setup(struct drm_device *dev)
		*/
		if (IS_G4X(dev))
		hotplug_en \|= CRT_HOTPLUG_ACTIVATION_PERIOD_64;
		hotplug_en &= ~CRT_HOTPLUG_VOLTAGE_COMPARE_MASK;
		hotplug_en \|= CRT_HOTPLUG_VOLTAGE_COMPARE_50;

		/* Ignore TV since it's buggy */