[RFC 0/7] UVD support for SI in amdgpu

[Alexandre Demers]

Hi there,


As you may remember, I was working on porting VCE 1.0 to amdgpu around 
the time Piotr Redlewski sent the UVD patches. I would prefer to go the 
way proposed by Alex Deucher than to see SI support being dropped. I've 
been using the amdgpu on a 280X ever since it was possible. While there 
were some quirks in the beginning, it is plenty usable and performant 
ever since.


Also, using amdgpu comes with some benefits unavailable with the radeon 
driver on a gaming perspective.


Now, if my work on porting VCE 1.0 has stalled, it's because I'm now a 
father and I had only so little time to work on it. The code I was 
working on is still dormant (some of it was sent on my github repo) and 
I'm pretty sure I was almost done with it.


Please, don't drop SI support from amdgpu. If it was only for me, amdgpu 
would be the default driver over radeon and people missing the UVD and 
VCE features should be the ones overriding the default choice. But this 
may not work for the majority (I don't know) and I understand that 
radeon is still the default for GCN 1.0/1.1.


Cheers,

Alexandre Demers


On 2019-12-05 10:32, Deucher, Alexander wrote:
>
> [AMD Official Use Only - Internal Distribution Only]
>
>
> You could enable UVD support on amdgpu using the original firmware 
> from radeon, but you'd have to adjust the memory map on the GPU for SI 
> to match radeon.  So updated firmware is not a requirement per se, 
> it's just needed to keep the memory map the same as other GPUs.
>
> Alex
>
> ------------------------------------------------------------------------
> *From:* amd-gfx <amd-gfx-bounces at lists.freedesktop.org> on behalf of 
> Christian König <ckoenig.leichtzumerken at gmail.com>
> *Sent:* Thursday, December 5, 2019 10:19 AM
> *To:* Matthew Taylor <mat at sharrow.me.uk>; 
> amd-gfx at lists.freedesktop.org <amd-gfx at lists.freedesktop.org>
> *Subject:* Re: [RFC 0/7] UVD support for SI in amdgpu
> Hi Matthew,
>
> Am 05.12.19 um 15:16 schrieb Matthew Taylor:
>> Hi,
>>
>> Back in November 2017, Piotr Redlewski, provided some patches for UVD 
>> support in the SI cards, the thread had the same subject as this 
>> message.
>>
>> The outcome of a conversation between himself and other developers on 
>> the list was to wait for something in updated firmware.  As this was 
>> over 2 years ago, I was wondering if the firmware has been updated 
>> sufficiently for Piotr's patches to be reconsidered or modified to 
>> deliver the UVD support for the SI cards?
>
> we discussed that internally quite lengthy and the firmware will 
> probably never be released.
>
> To be honest we actually considering dropping SI support completely 
> from amdgpu.
>
> Regards,
> Christian.
>
>>
>> Thanks for you help
>>
>> Kind Regards
>>
>> Matthew Taylor
>>
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