IMX8MP use both ISI and ISP

[malik_cisse]

Hi,

Is it actually possible to have both enabled, ISI and ISP?
My use case:

Raw bayer CSI camera ->ISI->ISP-> preview on screen

ISI-> Software ISP-> 12bit TIFF snapshots

This is to enable 12bit high resolution snapshots without stopping live preview.

BR, MC

[khang_letruong]

Hi,

Another hypothesis which could be more feasible :

And the following application note is only limited at single MIPI to dual ISIs, but no info about ISP : https://www.nxp.com/docs/en/application-note/AN13430.pdf

Combining the scenario in the above application note :

                     |------------------------> ISI0
CSI2 -------->|
                     |-------------------------> ISI1

and the theory of @dianapredescu :

                     |------------------------> ISI0

CSI2 -------->| (no need any operation of register for this mux)

                     |-------------------------> ISP0

I do hope hope that below configuration would be supported in future :

                     |------------------------> ISI0
CSI2 -------->|
                     |-------------------------> ISP1 (with the fact from the mentioned application note that output of MIPI-CSI2 can be hooked to ISI1, why couldn't it be hooked to ISP1 as in current single pipeline ? )

Best Regards,
K.

[malik_cisse]

Hi Joanxie,

The idea is to use ISI Raw Bayer 12bit output on /dev/video0 while on the same time use ISP processed image on /dev/video1 for example.

This way I have two independant video sources, one for display and one for Raw snapshots.

I know I can set ISP in bypass mode and get RG12 Raw Bayer image but I need to stop the display pipeline first for that. 

I don't want to stop display pipeline because this is bad user experience.

BR, MC

[joanxie]

why do you need connect isi to isp? why don't you connect your camera to ISP directly? imx8mp has dual isp, you can use dual ISP directly

[billie]

Hi Joanxie,

Is it possible to support 12MP 4K(3840x2880) resolution of Image Sensor through the ISI0 or ISI1?

According to the AN13430.pdf, it looks like  maximum resolution is 1920x1080.

Regards,

Billy