[RFC] Remove AGP support from Radeon/Nouveau/TTM

[John Paul Adrian Glaubitz]

Hello Christian!

On 5/13/20 3:44 PM, Christian Zigotzky wrote:
> AGP mode/support is deactivated on PowerPC and it doesn't work reliable????
> 
> And what does these lines mean:

AGP mode is actually disabled in the Radeon driver for PowerPC as Alex has pointed
out earlier in this thread [1]. Your graphics cards are basically running in PCI mode.

I don't know, however, what the performance impact is when AGP mode is turned
off. But it was turned off because it made PowerPC systems unstable.

It also seems that AGP mode poses an additional maintenance burden for the KMS/DRM
maintainers of the kernel so I understand the reasoning behind such a change.

I wonder though whether it would make sense to move the support for older GPUs
in legacy drivers, similar to what nVidia does with their commercial drivers.

Thanks,
Adrian

> [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=037d1a66ae640ca2723f47c0115ffa9e603699b3
> [2] https://bugs.freedesktop.org/show_bug.cgi?id=95017

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - glaubitz at debian.org
`. `'   Freie Universitaet Berlin - glaubitz at physik.fu-berlin.de
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