topic Re: i.mx93 CSI PPI Pattern Generator in i.MX Processors

i.mx93 CSI PPI Pattern Generator

BHC — Sun, 11 Aug 2024 01:48:59 GMT

I am porting an image sensor driver to i.mx93(GitHub - MYiR-Dev/myir-imx-linux at develop_6.1.55). The mipi clock/data lanes seems OK in oscilloscope but there is no pixel received. gasket_dump shows,

[ 110.908719] dwc-mipi-csi2-host 4ae00000.csi: gasket: CSI REG: 0x2371c
[ 110.915164] dwc-mipi-csi2-host 4ae00000.csi: gasket: MIPI -> ISI pixel ctrl: 0x207
[ 110.922738] dwc-mipi-csi2-host 4ae00000.csi: gasket: MIPI -> ISI pixel cnt: 0x0
[ 110.930052] dwc-mipi-csi2-host 4ae00000.csi: gasket: MIPI -> ISI line cnt: 0x0

So I check if any data will be received when PPI Pattern Generator is on,

1. PG is enabled by:

echo "enabled" > /sys/devices/platform/soc@0/42800000.bus/42800000.bus:camera/4ae00000.csi/ppi_pg_enable

2. However, after stream is on and before stream is off(dwc_mipi_csi2_s_stream),

dwc_mipi_csi2_dump shows PG is enabled but not running,

[ 110.782507] dwc-mipi-csi2-host 4ae00000.csi: DWC CSI2 PPI PG PATTERN HIGH: 0x440
[ 110.790003] dwc-mipi-csi2-host 4ae00000.csi: DWC CSI2 PPI PG PATTERN WIDTH: 0x780
[ 110.797512] dwc-mipi-csi2-host 4ae00000.csi: DWC CSI2 PPI PG CONFIG: 0x2400
[ 110.804476] dwc-mipi-csi2-host 4ae00000.csi: DWC CSI2 PPI PG ENABLE: 0x1
[ 110.811188] dwc-mipi-csi2-host 4ae00000.csi: DWC CSI2 PPI PG STATUS: 0x0

I am wondering if there is any other register to configure to make PG running on imx93. Any suggestion is greatly appreciated, thx!

Re: i.mx93 CSI PPI Pattern Generator

Hui_Ma — Mon, 12 Aug 2024 01:12:51 GMT

Hi,

As our online support metrics, we provided support based NXP product official released evaluation board(i.MX93EVK) and related software package.

Please contact with MYIR Electronics for MYC-LMX9X board support.

https://www.nxp.com/webapp/connect/displayPartnerProfile.sp?partnerId=12220

Thank you for the understanding.

Mike

Re: i.mx93 CSI PPI Pattern Generator

BHC — Mon, 19 Aug 2024 11:37:27 GMT

Understood. However, my question has nothing to do with the HW/SW desgin. Would you please let me know the essential REGISTER setting to get Pattern Generator working? Thanks.

Re: i.mx93 CSI PPI Pattern Generator

Hui_Ma — Tue, 20 Aug 2024 09:16:07 GMT

Hi,

We do lack of materials about MIPI CSI2 PPI Pattern generator register info.

There has no more register bits info about data type with Pattern Generator (PPI_PG_CONFIG).

What we know is the pattern supported color coding with below limitation:

RGB888 is supported in D-PHY (1, 2, 4 and 8 lanes) and C-PHY (3 trios) operation modes. No other color coding is supported.

I am sorry for this feedback.

Re: i.mx93 CSI PPI Pattern Generator

BHC — Tue, 20 Aug 2024 11:53:37 GMT

Hi,

Thanks for your reply. Data type is DT_RGB888(0x24) is my testing, however PG is still enabled but not active.Would anyone in this community like to share more information? Thanks.