[PATCH 1/4] etnaviv: use dummy RT buffer when rendering without color buffer

[Philipp Zabel]

On Thu, 2018-11-15 at 15:37 +0100, Lucas Stach wrote:
> At least GC2000 seems to push some dirt from the PE color cache into
> the last bound render target when drawing depth only. Newer cores
> seem to behave properly and don't do this, but I have found no way
> to fix it on GC2000. Flushes and stalls don't seem to make any
> difference.
> 
> In order to stop the core from pushing the dirt into a precious real
> render target, plug in dummy buffer when rendering without a color
> buffer.
> 
> Signed-off-by: Lucas Stach <l.stach at pengutronix.de>

Reviewed-by: Philipp Zabel <p.zabel at pengutronix.de>

regards
Philipp