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From: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
To: "Christian Zigotzky" <chzigotzky@xenosoft.de>,
	"Rui Salvaterra" <rsalvaterra@gmail.com>,
	"Michel Dänzer" <michel@daenzer.net>
Cc: "Christian König" <ckoenig.leichtzumerken@gmail.com>,
	"Maling list - DRI developers" <dri-devel@lists.freedesktop.org>,
	"debian-powerpc@lists.debian.org"
	<debian-powerpc@lists.debian.org>,
	"Karoly Balogh (Charlie/SGR)" <charlie@scenergy.dfmk.hu>
Subject: Re: [RFC] Remove AGP support from Radeon/Nouveau/TTM
Date: Wed, 13 May 2020 16:01:29 +0200	[thread overview]
Message-ID: <cac3bdfa-b998-7d94-7395-4bdcaf398bd8@physik.fu-berlin.de> (raw)
In-Reply-To: <ed0215b7-16f5-133d-70ab-96c4387ca14a@xenosoft.de>

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@debian.org
`. `'   Freie Universitaet Berlin - glaubitz@physik.fu-berlin.de
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913
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  reply	other threads:[~2020-05-13 14:01 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-11 19:55 [RFC] Remove AGP support from Radeon/Nouveau/TTM John Paul Adrian Glaubitz
2020-05-11 20:05 ` Alex Deucher
2020-05-11 20:25   ` Rui Salvaterra
2020-05-11 20:51     ` Alex Deucher
2020-05-12  7:57       ` Michel Dänzer
2020-05-12  9:21         ` Rui Salvaterra
2020-05-12  9:40           ` Karoly Balogh (Charlie/SGR)
2020-05-12 13:22             ` Alex Deucher
2020-05-12 16:37               ` Daniel Vetter
2020-05-12 17:02                 ` Rui Salvaterra
2020-05-12 18:21                   ` Alex Deucher
2020-05-12 20:12                     ` Dave Airlie
2020-05-13  7:26                       ` Christian König
2020-05-12 18:22                 ` Alex Deucher
2020-05-13  7:19                   ` Daniel Vetter
2020-05-13  7:55                     ` Christian König
2020-05-13 10:25                       ` Daniel Vetter
2020-05-13  9:28                     ` Rui Salvaterra
2020-05-13 10:26                       ` Michel Dänzer
2020-05-13 10:29                         ` Daniel Vetter
2020-05-13 10:32                           ` Michel Dänzer
2020-05-13 10:39                         ` Rui Salvaterra
2020-05-13 10:57                           ` Michel Dänzer
2020-05-13 11:07                             ` Rui Salvaterra
2020-05-13 13:44                               ` Christian Zigotzky
2020-05-13 14:01                                 ` John Paul Adrian Glaubitz [this message]
2020-05-13 14:01                                 ` Rui Salvaterra
2020-05-13 20:19                                   ` Bertrand Dekoninck
2020-05-13 20:36                                     ` Rui Salvaterra
2020-05-11 20:41   ` John Paul Adrian Glaubitz
2020-05-11 20:46     ` Alex Deucher
2020-05-11 21:50       ` John Paul Adrian Glaubitz
2020-05-12  7:43       ` Christian König
2020-05-11 20:12 ` Christian König
2020-05-11 20:24   ` John Paul Adrian Glaubitz
2020-05-11 20:48     ` Gerhard Pircher
2020-05-12  5:04 ` David VANTYGHEM
2020-05-12  9:20   ` John Paul Adrian Glaubitz
  -- strict thread matches above, loose matches on Subject: below --
2020-05-11 17:17 Christian König
2020-05-11 20:14 ` Al Dunsmuir
2020-05-11 20:27   ` Alex Deucher
2020-05-11 20:43     ` Dave Airlie
2020-05-11 20:56       ` Al Dunsmuir
2020-05-12  8:11         ` Christian König
2020-05-11 20:59       ` Emil Velikov
2020-05-11 20:46     ` Al Dunsmuir

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