[Open-graphics] Video interrupt enable/disable

[James Richard Tyrer]

Paul Brook wrote:
>>> IMHO the sync interrupt doesn't need to be different from to any other
>>> interrupt.
>> If the interrupt is the same for sync and service request, then the
>> driver will have to read two status register bits to see which interrupt
>> is set before the interrupt is serviced and then write back to clear the
>> interrupt.
> 
> Chances are you're going to have to do that anyway because you might be on a 
> shared interrupt line.

IIUC, shared PCI interrupts are handled by a Kernel driver.  It is 
transparent to the device driver for the PCI card.

-- 
JRT