[Intel-gfx] [PATCH] [drm/i915] Always read pipestat in irq_handler

[Keith Packard]

On Fri, 2008-11-28 at 17:13 +0800, Li Peng wrote:
>  
>  	iir = I915_READ(IIR);
>  
> +	if (iir == 0)
> +		return IRQ_NONE;
> +

We can't do that -- iir may be zero while there are still pipe
interrupts pending, due to the ordering between pipe stat writes and iir
writes. However, it looks like we need to ensure that the pipe stat
values are set before enabling interrupts.

-- 
keith.packard at intel.com
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