HDMi out on Venice2

HDMi out on Venice2

[Dylan Reid]

Hi Thierry,

Did you have to make any user-space changes to test the HDMI output on
Venice2?  I've got your recent patch series and see the hdmi device
being probed but I haven't figured out how to get X to use it.  I'm
using the sample rootfs that was posted for the Jetson board.

My goal is to be able to test the hdmi audio changes on this as well
as our downstream kernel.

Thanks,

Dylan

Re: HDMi out on Venice2

[Thierry Reding]

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On Mon, May 05, 2014 at 12:07:51PM -0700, Dylan Reid wrote:
> Hi Thierry,
> 
> Did you have to make any user-space changes to test the HDMI output on
> Venice2?  I've got your recent patch series and see the hdmi device
> being probed but I haven't figured out how to get X to use it.  I'm
> using the sample rootfs that was posted for the Jetson board.

I've used custom userspace, but I would expect regular X to work with
the patches as well. The sample rootfs probably comes with only the
NVIDIA Tegra X driver installed. Have you tried installing the
xf86-video-modesetting driver? That should automatically use the HDMI
output if it's connected to a monitor. If not you should still be able
to manually configure the outputs using xrandr.

> My goal is to be able to test the hdmi audio changes on this as well
> as our downstream kernel.

Note that while there's some code to support HDMI audio, nobody's ever
tested this upstream and it's likely not to work. So I think there may
be more work required to get that running. I can help out with that,
it's been on my list of things to do for a while.

Thierry

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Re: HDMi out on Venice2

[Stephen Warren]

On 05/05/2014 01:07 PM, Dylan Reid wrote:
> Hi Thierry,
> 
> Did you have to make any user-space changes to test the HDMI output on
> Venice2?  I've got your recent patch series and see the hdmi device
> being probed but I haven't figured out how to get X to use it.  I'm
> using the sample rootfs that was posted for the Jetson board.

Personally, I would always suggest starting with ubuntu-core and then
installing extra packages (such as X) from the upstream Ubuntu repositories.

Re: HDMi out on Venice2

[Dylan Reid]

On Mon, May 5, 2014 at 1:32 PM, Thierry Reding <thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> On Mon, May 05, 2014 at 12:07:51PM -0700, Dylan Reid wrote:
>> Hi Thierry,
>>
>> Did you have to make any user-space changes to test the HDMI output on
>> Venice2?  I've got your recent patch series and see the hdmi device
>> being probed but I haven't figured out how to get X to use it.  I'm
>> using the sample rootfs that was posted for the Jetson board.
>
> I've used custom userspace, but I would expect regular X to work with
> the patches as well. The sample rootfs probably comes with only the
> NVIDIA Tegra X driver installed. Have you tried installing the
> xf86-video-modesetting driver? That should automatically use the HDMI
> output if it's connected to a monitor. If not you should still be able
> to manually configure the outputs using xrandr.

Thanks, I haven't gotten to the point where I can see a screen in
xrandr yet, I'll try to find some time to dig a little deeper this
week.

>
>> My goal is to be able to test the hdmi audio changes on this as well
>> as our downstream kernel.
>
> Note that while there's some code to support HDMI audio, nobody's ever
> tested this upstream and it's likely not to work. So I think there may
> be more work required to get that running. I can help out with that,
> it's been on my list of things to do for a while.

Understood, although what is upstream looks pretty similar to what is
in our tree so I'm optimistic =)

>
> Thierry

Re: HDMi out on Venice2

[Dylan Reid]

On Mon, May 5, 2014 at 7:14 PM, Dylan Reid <dgreid-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org> wrote:
> On Mon, May 5, 2014 at 1:32 PM, Thierry Reding <thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>> On Mon, May 05, 2014 at 12:07:51PM -0700, Dylan Reid wrote:
>>> Hi Thierry,
>>>
>>> Did you have to make any user-space changes to test the HDMI output on
>>> Venice2?  I've got your recent patch series and see the hdmi device
>>> being probed but I haven't figured out how to get X to use it.  I'm
>>> using the sample rootfs that was posted for the Jetson board.
>>
>> I've used custom userspace, but I would expect regular X to work with
>> the patches as well. The sample rootfs probably comes with only the
>> NVIDIA Tegra X driver installed. Have you tried installing the
>> xf86-video-modesetting driver? That should automatically use the HDMI
>> output if it's connected to a monitor. If not you should still be able
>> to manually configure the outputs using xrandr.
>
> Thanks, I haven't gotten to the point where I can see a screen in
> xrandr yet, I'll try to find some time to dig a little deeper this
> week.
>
>>
>>> My goal is to be able to test the hdmi audio changes on this as well
>>> as our downstream kernel.
>>
>> Note that while there's some code to support HDMI audio, nobody's ever
>> tested this upstream and it's likely not to work. So I think there may
>> be more work required to get that running. I can help out with that,
>> it's been on my list of things to do for a while.
>
> Understood, although what is upstream looks pretty similar to what is
> in our tree so I'm optimistic =)

Sorry I didn't get around to testing this until today.  Luckily it
worked, but I had to make two changes:

1) Make the hdmi entry in the tegra124 dt compatible with tegra114-hdmi.

2) Have driver/gpu/drm/tegra/hdmi.c enable hdmi-supply when enabling
the pll supply, without this DDC doesn't work.

Easy fixes, I'll post patches for these this weekend.

-Dylan

>
>>
>> Thierry