[Intel-gfx] [RFC][PATCH 14/14] WIP/drm/i915: Nuke posting reads from plane updates

[Chris Wilson]

On Fri, Mar 17, 2017 at 11:18:08PM +0200, ville.syrjala at linux.intel.com wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> We'll maybe want just one posting read at the end? This does seem to
> potentially shave a few usec off from the update.

They are all superfluous until proven otherwise. The only cases where I
would (quietly) argue for a post is before a latch (to document the
serialisation of the latch with the controls that go before) and before
completing the transaction and waiting for the hw/irq.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre