VC4 DRM

VC4 DRM

[Sergey Suloev]

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Eric, Noralf,

could either of you answer a question about Vc4 DRM, please ?

I am trying to connect MIPI DSI display to VC4 but it isn't showing 
anything. I have noticed
that the DSI host  transfer() method vc4_dsi_host_transfer gets called 
for the commands that
I am sending from my panel driver, but not for pixel data.

My question: are pixel data normally transferred the same method within 
vc4_dsi driver
or any "behind the scene" way ?

Thank you,
Sergey


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Re: VC4 DRM

[Eric Anholt]

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Sergey Suloev <ssuloev@orpaltech.com> writes:

> Eric, Noralf,
>
> could either of you answer a question about Vc4 DRM, please ?
>
> I am trying to connect MIPI DSI display to VC4 but it isn't showing 
> anything. I have noticed
> that the DSI host  transfer() method vc4_dsi_host_transfer gets called 
> for the commands that
> I am sending from my panel driver, but not for pixel data.
>
> My question: are pixel data normally transferred the same method within 
> vc4_dsi driver
> or any "behind the scene" way ?

The transfer function isn't used for pixel data in video mode.  The vc4
panel has never been used for command mode panels, so if you have one of
those it will probably be extra work.

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Re: VC4 DRM

[Sergey Suloev]

Eric, thanks for answer,

I am in doubt the type of my panel. It is Himax HX8379A-based panel.
Is there a deterministic way to find  out which type of panel  I have, 
video or command ?


Sergey


On 12/17/18 9:12 PM, Eric Anholt wrote:
> Sergey Suloev <ssuloev@orpaltech.com> writes:
>
>> Eric, Noralf,
>>
>> could either of you answer a question about Vc4 DRM, please ?
>>
>> I am trying to connect MIPI DSI display to VC4 but it isn't showing
>> anything. I have noticed
>> that the DSI host  transfer() method vc4_dsi_host_transfer gets called
>> for the commands that
>> I am sending from my panel driver, but not for pixel data.
>>
>> My question: are pixel data normally transferred the same method within
>> vc4_dsi driver
>> or any "behind the scene" way ?
> The transfer function isn't used for pixel data in video mode.  The vc4
> panel has never been used for command mode panels, so if you have one of
> those it will probably be extra work.
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Re: VC4 DRM

[Eric Anholt]

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Sergey Suloev <ssuloev@orpaltech.com> writes:

> Eric, thanks for answer,
>
> I am in doubt the type of my panel. It is Himax HX8379A-based panel.
> Is there a deterministic way to find  out which type of panel  I have, 
> video or command ?

You have to find your panel's documentation, existing drivers, etc.

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