From: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
To: christian.koenig@amd.com
Cc: "debian-powerpc@lists.debian.org"
<debian-powerpc@lists.debian.org>,
Maling list - DRI developers <dri-devel@lists.freedesktop.org>
Subject: Re: [RFC] Remove AGP support from Radeon/Nouveau/TTM
Date: Mon, 11 May 2020 22:24:09 +0200 [thread overview]
Message-ID: <3b8bfa86-73c0-0eb1-1723-a4f725aec327@physik.fu-berlin.de> (raw)
In-Reply-To: <f57bb3dc-6888-9b19-d2f6-c432eb32a480@gmail.com>
On 5/11/20 10:12 PM, Christian König wrote:
> I unfortunately only have an x86 Mac to test this on, but as far as I know the Radeon
> AGP support for PowerPC is disabled for years already because it didn't worked reliable.
I have a current Debian unstable running on an iBook G4 with Radeon graphics enabled
on a current kernel and graphics stack and it runs fine. Not sure though whether
it currently employs all AGP features, but I would like to be able to continue
using it and so are the users on the debian-powerpc mailing list.
>>> So the idea here is to just go ahead and remove the support from Radeon and Nouveau and
>>> then drop the necessary code from TTM.
>>> For Radeon this means that we just switch over to the driver specific page tables and
>>> everything should more or less continue to work.
>>>
>>> For Nouveau I'm not 100% sure, but from the code it of hand looks like we can do it similar to Radeon.
>>>
>>> Please comment what you think about this.
>> I would be against such a move as AGP graphics is still used by people running the powerpc
>> and ppc64 Debian ports on their vintage hardware [1].
>
> Please note that at least the Mac I was able to test with Radeon hardware just continuous
> to work. But it is certainly possible that some pre r3xx generation hardware will break with this.
>
> We just stop using this bogus idea of trying to use uncached system memory as "extension" of the
> on board video memory and instead switch to the reliable device internal GART.
Well, the title "Remove AGP support" in the subject implied something else to me which
is why I wrote this mail. If this just applies to the mechanism to allow system memory
to be used as graphics memory, the results may be different.
> Maybe we should just deprecate the configuration option first?
Would this change imply the removal of CONFIG_AGP_*? If yes, I assume that would
kill CONFIG_AGP_UNINORTH which we have enabled on our PowerPC kernels for powerpc
and ppc64.
Adrian
--
.''`. 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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next prev parent reply other threads:[~2020-05-11 20:24 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
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 [this message]
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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