Re: PowerPC agpmode issues

[Mike <michael.heltne@gmail.com>]

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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@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@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@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@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@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@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@lists.ozlabs.org
>>>>> https://lists.ozlabs.org/listinfo/linuxppc-dev
>>>>>
>>>>>
>>>>
>>>
>>
>

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