Questions about simplefb and hand-over

Questions about simplefb and hand-over

[Johannes Pointner]

Hello all,

I'd like to use the simplefb in combination with tilcdc drm driver
with a TI AM335x processor. I got the u-boot to simplefb part working,
but I'm not sure how to do the hand-over part.

Is it yet possible to do that? Does the tilcdc drm driver need
additional functionality to support that? Or are there other things I
have to take into account?

Any suggestions would be highly appreciated!

Thanks in Advance,
Hannes
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Re: Questions about simplefb and hand-over

[Hans de Goede]

Hi,

On 03-04-15 10:57, Johannes Pointner wrote:
> Hello all,
>
> I'd like to use the simplefb in combination with tilcdc drm driver
> with a TI AM335x processor. I got the u-boot to simplefb part working,
> but I'm not sure how to do the hand-over part.
>
> Is it yet possible to do that? Does the tilcdc drm driver need
> additional functionality to support that? Or are there other things I
> have to take into account?
>
> Any suggestions would be highly appreciated!

There is a remove_conflicting_framebuffers call which is already used
on x86 to remove e.g. efifb when a kms driver loads, the plan for
simplefb / arm is to do the same. That is where we stand now, we've
a plan but you're the first person to actually try this.

Note that you may want to use simpledrm by David Herrmann (added to the
Cc) instead of simplefb as that will give you a kms driver right from
the start, simpledrm is not yet upstream but should go upstream soon.

Regards,

Hans


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Re: Questions about simplefb and hand-over

[Johannes Pointner]

Hello,

thank you for your reply.
I will take a look at the x86 code and at the function you mentioned.

Do you know where the simpledrm is hosted, because I would like to
take look at it too.

Thanks,
Hannes



2015-04-03 11:02 GMT+02:00 Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>:
> Hi,
>
>
> On 03-04-15 10:57, Johannes Pointner wrote:
>>
>> Hello all,
>>
>> I'd like to use the simplefb in combination with tilcdc drm driver
>> with a TI AM335x processor. I got the u-boot to simplefb part working,
>> but I'm not sure how to do the hand-over part.
>>
>> Is it yet possible to do that? Does the tilcdc drm driver need
>> additional functionality to support that? Or are there other things I
>> have to take into account?
>>
>> Any suggestions would be highly appreciated!
>
>
> There is a remove_conflicting_framebuffers call which is already used
> on x86 to remove e.g. efifb when a kms driver loads, the plan for
> simplefb / arm is to do the same. That is where we stand now, we've
> a plan but you're the first person to actually try this.
>
> Note that you may want to use simpledrm by David Herrmann (added to the
> Cc) instead of simplefb as that will give you a kms driver right from
> the start, simpledrm is not yet upstream but should go upstream soon.
>
> Regards,
>
> Hans
>
>
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Re: Questions about simplefb and hand-over

[Hans de Goede]

Hi,

On 08-04-15 09:24, Johannes Pointner wrote:
> Hello,
>
> thank you for your reply.
> I will take a look at the x86 code and at the function you mentioned.
>
> Do you know where the simpledrm is hosted, because I would like to
> take look at it too.

David Herrmann (in the Cc) is the best person to answer that, I
think he needs to rebase on it on the latest upstream kernel.

David ?

Regards,

Hans
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Re: Questions about simplefb and hand-over

[David Herrmann]

Hi

On Wed, Apr 8, 2015 at 9:30 AM, Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> wrote:
> Hi,
>
> On 08-04-15 09:24, Johannes Pointner wrote:
>>
>> Hello,
>>
>> thank you for your reply.
>> I will take a look at the x86 code and at the function you mentioned.
>>
>> Do you know where the simpledrm is hosted, because I would like to
>> take look at it too.
>
>
> David Herrmann (in the Cc) is the best person to answer that, I
> think he needs to rebase on it on the latest upstream kernel.
>
> David ?

http://cgit.freedesktop.org/~dvdhrm/linux/log/?h=simpledrm

I should _definitely_ revive that. My TODO list does get shorter, so
lets see whether I can find some spare time for it.

Please note that you can use remove_conflicting_framebuffers() with
simplefb just fine. No reason to wait for simpledrm (except that it's
way cooler!). Once I push the patches, I will convert
remove_conflicting_framebuffers() to work just fine, and simpledrm
will take-over all simplefb devices seamlessly.

Thanks
David
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