Librem 5: hang with cam -C1

[Pavel Machek]

Hi!

> > With -C100, it actually works, for both front and back cameras.
> 
> great news \o/

:). There's still bug somewhere, -C2 results in two buffer captured
and exit, -C1 results in hang, which is quite confusing.

> > > I'm afraid a more detailed log is needed.
> > > Run the above command with
> > >
> > > LIBCAMERA_LOG_LEVELS=0
> > >
> > > As librem5 has no ISP but a RAW sensor as far as I remember (I still
> > > can't figure out what they were thinking when they selected this weird
> > > combination) make sure you have the SimplePipelineHandler and
> > > SoftwareISP compiled in and enabled.
> >
> > Yep, that's correct. I'm afraid combination of RAW sensor and no ISP
> 
> In this specific case, the imx8mq SoC on the librem5 has no physical ISP
> 
> > or no drivers for ISP is going to be common for a while in phone area
> > :-(.
> 
> That's why we're very glad to have the software ISP in libcamera and
> see great improvements there from Milan and others ! ;)

Yes, so... I'd like to take a stab at implementing autofocus in
software ISP, as I understand that one is still missing.

Any hints how to enable SoftwareISP?

meson configure build says

ipas               [ipu3, mali-c55,     [ipu3, mali-c55,     Select which IPA    
                      rkisp1, rpi/pisp,    rkisp1, rpi/pisp,   modules to build    
                      rpi/vc4, simple,     rpi/vc4, simple,                        
                      vimc]                vimc]
pipelines          [auto]               [all, auto,          Select which        
                                           imx8-isi, ipu3,     pipeline handlers to
                                           mali-c55, rkisp1,   build. If this is   
                                           rpi/pisp, rpi/vc4,  set to "auto", all  
                                           simple, uvcvideo,   the pipelines       
                                           vimc, virtual]      applicable to the   

But I have no idea how if that's enough and what needs to be done at
runtime.

Thanks,
								Pavel
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