[Advice Needed] splash on i.MX IPU

[Advice Needed] splash on i.MX IPU

[Stephan Bauroth]

Dear dri-devel, spec. Dear i.MX folks,

I would like to display a splash screen on an i.MX6 based board from the 
kernel as soon as the display hardware is initialized. But I'm having 
trouble finding some kind of 'take this buffer and display it' function 
within the IPU driver. (And I see no way of specifying such thing within 
the device tree)

I tried to trace a userspace write to /dev/fb0 to see where it ends up, 
but didn't succeed in finding the right entry point. I am aware of the 
fact that the bootloader typically displays a splash and linux then 
doesn't touch it, but this solution is not feasible for me, mostly 
because it would include duplicating the functionality of a display 
driver when the kernel offers a working one.

Has anybody built a splash from the kernel before? Or can anyone give me 
a few pointers where to look for a start within the driver? Any help is 
appreciated.

regards,
Stephan
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Re: [Advice Needed] splash on i.MX IPU

[PrasannaKumar Muralidharan]

Hi,

On 3 November 2017 at 16:56, Stephan Bauroth <der_steffi@gmx.de> wrote:
> Dear dri-devel, spec. Dear i.MX folks,
>
> I would like to display a splash screen on an i.MX6 based board from the
> kernel as soon as the display hardware is initialized. But I'm having
> trouble finding some kind of 'take this buffer and display it' function
> within the IPU driver. (And I see no way of specifying such thing within the
> device tree)
>
> I tried to trace a userspace write to /dev/fb0 to see where it ends up, but
> didn't succeed in finding the right entry point. I am aware of the fact that
> the bootloader typically displays a splash and linux then doesn't touch it,
> but this solution is not feasible for me, mostly because it would include
> duplicating the functionality of a display driver when the kernel offers a
> working one.
>
> Has anybody built a splash from the kernel before? Or can anyone give me a
> few pointers where to look for a start within the driver? Any help is
> appreciated.
>
> regards,
> Stephan
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

Please take a look at
http://lkml.iu.edu/hypermail/linux/kernel/1710.3/01542.html. I think
your need is similar to this. The solution is not mainline yet.

Thanks,
PrasannaKumar
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Re: [Advice Needed] splash on i.MX IPU

[Stephan Bauroth]

On 03.11.2017 13:57, PrasannaKumar Muralidharan wrote:
> Hi,
>
> On 3 November 2017 at 16:56, Stephan Bauroth <der_steffi@gmx.de> wrote:
>> Dear dri-devel, spec. Dear i.MX folks,
>>
>> I would like to display a splash screen on an i.MX6 based board from the
>> kernel as soon as the display hardware is initialized. But I'm having
>> trouble finding some kind of 'take this buffer and display it' function
>> within the IPU driver. (And I see no way of specifying such thing within the
>> device tree)
>>
>> I tried to trace a userspace write to /dev/fb0 to see where it ends up, but
>> didn't succeed in finding the right entry point. I am aware of the fact that
>> the bootloader typically displays a splash and linux then doesn't touch it,
>> but this solution is not feasible for me, mostly because it would include
>> duplicating the functionality of a display driver when the kernel offers a
>> working one.
>>
>> Has anybody built a splash from the kernel before? Or can anyone give me a
>> few pointers where to look for a start within the driver? Any help is
>> appreciated.
>>
>> regards,
>> Stephan
>> _______________________________________________
>> dri-devel mailing list
>> dri-devel@lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel
> Please take a look at
> http://lkml.iu.edu/hypermail/linux/kernel/1710.3/01542.html. I think
> your need is similar to this. The solution is not mainline yet.
>
> Thanks,
> PrasannaKumar
That indeed looks promising, I will look into it. Thanks!

Stephan
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

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