Quoting Ville Syrjala (2018-06-11 21:02:56)
> From: Ville Syrjälä <[email protected]>
> 
> 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: [email protected]
> Signed-off-by: Ville Syrjälä <[email protected]>

Having accepted the first,
Reviewed-by: Chris Wilson <[email protected]>
-Chris
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