[Intel-gfx] [PATCH] drm/i915: fix 845G FIFO size & burst length

[Dave Airlie]

On Thu, Jul 23, 2009 at 5:54 AM, Jesse Barnes<jbarnes at virtuousgeek.org> wrote:
> I had one report of flicker due to FIFO underruns on 845G.  Scott was
> kind enough to test a few patches and report success with this one.
> Looks like 845G measures FIFO size slightly differently than other
> chips, and we were also clobbering the FIFO burst length.  Fixing both
> of those issues gives him a healthy machine again.
>
> Note that we still only adjust plane A's watermark in the 830/845
> case.  If someone is willing to test we could support a bigger variety
> of dual-head 830/845 configurations with a bit more code.

I don't think 845 ever had a second pipe/plane in it.

from memory 845G and 865G were single crtc chips for desktops.

Dave.