EXA for radeon experimental patch

Anthony Romano dominatus at gmail.com
Tue Aug 30 08:33:09 PDT 2005

Ill test this out tonight on an r200

On 8/30/05, Benjamin Herrenschmidt <benh at kernel.crashing.org> wrote:
> Hi !
> Here you can find a patch that adds EXA for radeon. Heavily based on the
> initial patch from Eric Anholt. What this patch does _NOT_ do yet:
>  - Composite hooks aren't there. You can enable the r200 hooks though
> but they haven't been tested
>  - Xv is untested and possibly still broken on various configs
> What this patch does do that is not related to exa (yah, I know ...) :
>  - Fixes r300 endian problems with color expansion and XAA. Note that Xv
> may still be broken in various combinations of image types vs. endian.
> The solution might not be terrific but I couldn't find a hardware
> swapper that works.
> What this patch does with EXA:
>  - Implements solid fills and blits both with CP and MMIO
>  - Implements UpdateToScreen as DMA when using CP (with proper endian
>   for r300 hopefully, r200 is untested for now)
>  - DownloadFromScreen should work but is slow (no DMA). I haven't found
>   a scenario that causes EXA to call it though so I haven't validated
>   it.
> It still needs a lot of cleanups, it needs r100 versions of the
> composite code, the r200 one need to be tested and be made to work on
> MMIO (it shouldn't require the CP strictly speaking), and it needs
> somebody who understands the r300 3D engine to write r300 composite
> hooks (similar to Render hooks for XAA).
> Enjoy:
>  http://gate.crashing.org/~benh/radeon-exa-benh-2.diff
> And report any problem to me. Known problem: with current top of tree
> EXA implementation, it locks up if you enable the composite hooks but
> they return FALSE; Eric has a patch for that already (it's an EXA bug).
> Ben.
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