PowerPC agpmode issues

[Herminio Hernandez, Jr.]

Yeah that is the thread I am on

On Fri, Feb 5, 2016 at 1:44 PM, Mike <michael.heltne at gmail.com> wrote:

> Thanks, found this now -
> https://www.mail-archive.com/search?l=mesa-dev@lists.freedesktop.org&q=subject:%22%5C%5BMesa%5C-dev%5C%5D+gallium+r300+driver+for+PowerPC%22&o=newest&f=1
>
>
> On 5 February 2016 at 18:08, Herminio Hernandez, Jr. <
> herminio.hernandezjr at gmail.com> wrote:
>
>> 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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