[Intel-gfx] [PATCH v6] drm/i915/vlv: Added a rendering specific Hw WA 'WaTlbInvalidateStoreDataBefore'

[Chris Wilson]

On Tue, Mar 25, 2014 at 03:23:34PM +0530, sourab.gupta at intel.com wrote:
> From: Akash Goel <akash.goel at intel.com>
> 
> Added a new rendering specific Workaround 'WaTlbInvalidateStoreDataBefore'.
> This workaround has to be applied before doing TLB Invalidation on render ring.
> In this WA, before pipecontrol with TLB invalidate set, need to add 2 MI
> Store data commands.
> Without this, hardware cannot guarantee the command after the PIPE_CONTROL
> with TLB inv will not use the old TLB values.

Note, that our command programming sequence already has multiple dword
writes between the flush of the last batch and the invalidation of the
next.

Is this w/a still required? Why?
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre