i.MX ProcessorsのトピックRe: imx8m mini mipi capture image wrong

imx8m mini mipi capture image wrong

chinaman — Wed, 29 Jul 2020 03:37:31 GMT

Hi，all：

I am using imx8mm with an mipi camera imx334. The sensor run at 891Mbps，4 lanes， 3824x2176，30fps，10bits raw data.My bsp is 4.14.98.

Take the image from the sensor as shown in the figure below，it looks like several images are stitched together.

My understanding is that the image path is sensor->mipi phy->csi bridge-> memory.I'm sure the sensor is OK because I've verified it on other motherboards platforms.And I can also be sure that Mipi phy is OK because there are no errors reported in the interrupt mipi_csis_irq_handler in file mxc_mipi_csi.c.What puzzles me is CSI bridge，in mx6s_capture.c the mx6s_csi_irq_handler processes the image data from Mipi PHY.when processing images,it was supposed to have 30 interrupts per second, but actually it was less than 10.

Can anyone know why about this?

Re: imx8m mini mipi capture image wrong

joanxie — Wed, 29 Jul 2020 05:15:28 GMT

for capture raw 10bits data, did you change any source code? maybe you can refer to the link as below:

https://community.nxp.com/message/1225950?commentID=1225950#comment-1225950

Re: imx8m mini mipi capture image wrong

chinaman — Wed, 29 Jul 2020 05:44:00 GMT

I've tried code like this before,it doesn't work.

Re: imx8m mini mipi capture image wrong

joanxie — Thu, 30 Jul 2020 08:02:23 GMT

any improvement if you set lane to 2? what change have you tried so far?? did you change the clock?

Re: imx8m mini mipi capture image wrong

chinaman — Thu, 30 Jul 2020 09:11:08 GMT

Imx334 only supports 4 lanes or 8 lanes.There will be CRC or SOT errors reported in mipi_csis_irq_handler in mxc_mipi_csi.c if I set the mipi lanes to 2.How can I change clock.

Looking forward to your reply.

Re: imx8m mini mipi capture image wrong

joanxie — Fri, 31 Jul 2020 08:58:53 GMT

if you use 4 lanes, try to change the clock in the dts file:

assigned-clock-rates = <266000000>, <333000000>, <66000000>

Re: imx8m mini mipi capture image wrong

chinaman — Fri, 31 Jul 2020 10:24:58 GMT

That makes no difference.And the code seems to be imx8m not for imx8mm.

Re: imx8m mini mipi capture image wrong

joanxie — Thu, 13 Aug 2020 07:45:37 GMT

yes, this setting is for imx8m, for imx8mm, still set clk_ui to 333Mhz for your case, and did you set this to dual pixel mode or quad pixel mode?

Re: imx8m mini mipi capture image wrong

abdu2 — Tue, 08 Jun 2021 05:49:47 GMT

Hi ! @chinaman ,

We are using iMX8M processor and seeing similar issue like what you have posted. Our configuration on the sensor is 4lane, 720Mbps. Same issue with 720p30, 1080p30, 4Kp30.

Have you got this issue resolved ?

Appreciate your suggestion on solving the issue @chinaman @joanxie

Regards

Abdu Samad

Re: imx8m mini mipi capture image wrong

udhayamoorthi — Thu, 15 Sep 2022 06:43:22 GMT

can you pls share your dtsi,mipi_csi and mx6s_capture.c driver codes?