[Mesa-dev] [PATCH 0/5] Anv border colors on IVB/HSW

[Lionel Landwerlin]

On Mon, 2016-10-17 at 12:34 -0700, Kenneth Graunke wrote:
> On Monday, October 17, 2016 4:46:54 PM PDT Lionel Landwerlin wrote:
> > Hi,
> > 
> > Spoiler alert, this series doesn't actually make the border colors
> > work on
> > IvyBridge and Haswell. It still brings some useful changes (I
> > think).
> > 
> > On Haswell, it seems the hardware always reads the border color
> > from the
> > offset 0 of the "Dynamic State Memory Address", regardless of what
> > offset is
> > programmed in the "Border Color Pointer" field of the SAMPLER_STATE
> > structure. Maybe some kind of cache invalidation is missing in this
> > series?
> > Any idea/pointer is more than welcome!
> > 
> > Cheers,
> > Lionel Landwerlin
> 
> Ouch.  I'm pretty sure you've hit the undocumented hardware bug I
> discovered a few years ago.
> 
> The STATE_BASE_ADDRESS "Dynamic State Access Upper Bound" field is
> supposed to be ignored when it is zero, but the sampler border color
> access apparently fails to do so.  So the address gets clamped.
> 
> Program that to a proper value (or 0xFFFFFFFF) and I bet it will
> work.
> 
> See c25e5300cba7628b58df93ead14ebc3cc32f338c in the GL driver.
> 
> Sorry for not thinking to warn you sooner :(

Ahah :)

No worries, I should have posted this series earlier.
Thanks a bunch will try your suggestion soon!