PowerPC agpmode issues

[Herminio Hernandez, Jr.]

Excellent work would be me figure out how to fix it :)

On Fri, Feb 5, 2016 at 1:59 PM, Mike <michael.heltne at gmail.com> wrote:

> Excellent work!
>
> On 5 February 2016 at 19:46, Herminio Hernandez, Jr. <
> herminio.hernandezjr at gmail.com> wrote:
>
>> 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
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.ozlabs.org/pipermail/linuxppc-dev/attachments/20160205/7d5b9dc2/attachment-0001.html>