[Intel-gfx] [PATCH 2/4] drm/i915: Fix hotplug irq ack on i965/g4x

[Chris Wilson]

Quoting Ville Syrjala (2018-06-11 21:02:56)
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> Just like with PIPESTAT, the edge triggered IIR on i965/g4x
> also causes problems for hotplug interrupts. To make sure
> we don't get the IIR port interrupt bit stuck low with the
> ISR bit high we must force an edge in ISR. We do that by
> clearing PORT_HOTPLUG_EN temporaryly when we ack
> PORT_HOTPLUG_STAT.
> 
> Cc: stable at vger.kernel.org
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

Having accepted the first,
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
-Chris