PowerPC agpmode issues

[Herminio Hernandez, Jr.]

Yeah the issue is with the driOpenDriver function at least that what I
think from what I saw in gdb.

On Fri, Feb 5, 2016 at 12:06 PM, Mike <michael.heltne at gmail.com> wrote:

> True, a permanent patch was needed, but at least we are up and running and
> can identify other issues.. In the thread with the patches it is
> highlighted that the drivers are broken in the first place
>
> On 5 February 2016 at 17:51, Herminio Hernandez, Jr. <
> herminio.hernandezjr at gmail.com> wrote:
>
>> I have already applied his patches on my PowerBook running Jessie to get
>> accelerated graphics. However they are only a work around and not a real
>> fix so they will be committed to mesa.
>>
>> On Fri, Feb 5, 2016 at 8:44 AM, Mike <michael.heltne at gmail.com> wrote:
>>
>>> Herminio,
>>>
>>> Ok, take a look at this.
>>> https://github.com/threader/mesa-11.1.1-ppc-r300-debian or if on stable
>>> maybe this is more fitting
>>> https://github.com/threader/mesa-10.6.3-ppc-r300-debian - this only
>>> fixes the issue for r300 on powerpc though.
>>>
>>> On 5 February 2016 at 14:32, Herminio Hernandez Jr. <
>>> herminio.hernandezjr at gmail.com> wrote:
>>>
>>>> I have been experiencing the same thing with my iBook and PowerBook.
>>>>
>>>> Sent from my iPhone
>>>>
>>>> On Feb 4, 2016, at 8:47 PM, Mike <michael.heltne at gmail.com> wrote:
>>>>
>>>> Hi.
>>>> Managed to get the Radeon R300 running on mesa 11.1.1 with an old 2013
>>>> patch from Michel Dànzer, next problem is of course enabling agpmode,
>>>> running with pci-mode with radeon.agpmode=-1 works, but is of course slow,
>>>> and seems to load the cpu a lot.
>>>>
>>>> Upon initial investigation i could not initially believe agp could be
>>>> this this broken for this long, until i found this.
>>>>  "committed with Ben Skeggs on Feb 26, 2013"
>>>>
>>>> https://github.com/DespairFactor/bullhead/commit/650e1203c11354ba84d69ba445abc0efcfe3890a
>>>>
>>>> http://lxr.free-electrons.com/source/drivers/gpu/drm/nouveau/nouveau_agp.c?v=4.2
>>>> #ifdef __powerpc__
>>>> /* Disable AGP by default on all PowerPC machines for
>>>> * now -- At least some UniNorth-2 AGP bridges are
>>>> * known to be broken: DMA from the host to the card
>>>> * works just fine, but writeback from the card to the
>>>> * host goes straight to memory untranslated bypassing
>>>> * the GATT somehow, making them quite painful to deal
>>>> * with...
>>>> */
>>>> if (nouveau_agpmode == -1)
>>>> return false;
>>>> #endif
>>>>
>>>>  and now later this:
>>>>
>>>> https://github.com/torvalds/linux/blob/master/drivers/gpu/drm/nouveau/nvkm/subdev/pci/agp.c
>>>> #ifdef __powerpc__
>>>> /* Disable AGP by default on all PowerPC machines for now -- At
>>>> * least some UniNorth-2 AGP bridges are known to be broken:
>>>> * DMA from the host to the card works just fine, but writeback
>>>> * from the card to the host goes straight to memory
>>>> * untranslated bypassing that GATT somehow, making them quite
>>>> * painful to deal with...
>>>> */
>>>> mode = 0;
>>>> #endif
>>>>
>>>> All seems to point to serious issues had around the time of change to
>>>> ums to kms and a serious regression hitting the linux kernel? No?
>>>>
>>>> Cheers
>>>> -Mike
>>>>
>>>> _______________________________________________
>>>> Linuxppc-dev mailing list
>>>> Linuxppc-dev at lists.ozlabs.org
>>>> https://lists.ozlabs.org/listinfo/linuxppc-dev
>>>>
>>>>
>>>
>>
>
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