IMX8MQ MIPI CSI2 setting the CSI CORE clk to 266MHZ causes the CPU hang

[agnel_terry]

HI ,

I am doing a V4l2src capture on mipi CSI in IMX8MQ the sensor connected to the IMX8Mq is Toshiba TC358840 , I am able to capture the video for 720P and 1080P30 , When Trying 1080P60 ,I don't see the frame , I Chnaged my Sensor's HSCK to 600Mhz and tried the MIPI CSI of IMX8 with the following assigned-clock-rates = <133000000>, <100000000>, <66000000>;  I dont see a proper Image in the display, Assuming the Core clock and PLL need to be increased for 1080P60, I changed to the following speed assigned-clock-rates = <266000000>, <200000000>, <66000000>; 
if I change the core clock to 266Mhz and after bootup if I start the g-streamer  with v4l2src
gst-launch-1.0 v4l2src device=/dev/video0 ! glimagesink render-rectangle='<0,0
,1920,1080>'
the CPU hangs.

NOTE: I am having the workaround for RX fifo overflow issue , M4 monitor the FIFO level register 0x4c, Even with the workaround the CPu hangs.

This issue happens only when I change the CORE clock .

Can someone help what I am doing wrong here.

Thanks

[Chavira]

Hi @agnel_terry!
Thank you for contacting NXP Support!

Are you monitoring the CSI register with the M core?

The system can hang if both cores are accessing to the same peripheral.

Please check your driver.

Best Regards!

Chavira

[agnel_terry]

Hi Chavira ,

Thank you for the response, Yes I am monitoring the registers in M4 core, but the same driver and same setup works fine when I set the MIPI CORE clock to 133MHZ , this issue happens only when I increase the MIPI core clock speed, 

Any idea why it happens only when I change the clock speed?

Thanks and Regards

Terry

[Chavira]

HI @agnel_terry!

The system can hang if both cores are accessing to the same peripheral.

Please check your driver.

Best Regards!

Chavira

[agnel_terry]

Hi ,

Is there any info for the above  question,

HSCK	PRD	FRS	FBD	video resolutions	IMX8 MIPI CORE	IMX8 MIPI PLL
274909068	10	1	125	1080P24 , 720P60	133Mhz	100Mhz
549818136	10	0	125	1080P60	266Mhz	333Mhz

When setting the Core to 266 and pLL to 333 , CPU hangs.

Thanks

Terry