Re: [PATCH] drm/i915 : Removed the unconditional cross engine/ring update of MBOX registers

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On Tue, Jun 10, 2014 at 12:48:44PM +0530, sourab.gupta@xxxxxxxxx wrote:
> From: Akash Goel <akash.goel@xxxxxxxxx>
> 
> Removed the unconditional cross engine/ring update of MBOX registers.
> The MBox update will done only when needed when the actual inter ring
> dependency has been ascertained. Although this late sync could affect
> the Media performance slightly but it shall improve the residency time
> of individual power wells in C6 state.

NAK. Did you even consider the deadlocks above and beyond the issues with
latency? Maybe suggest that the hardware guys consider a reordering write
FIFO next time like elsewhere on the chip.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
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