Hello Martin, Am Freitag, dem 12.11.2021 um 12:23 +0100 schrieb Martin Kepplinger: > hi Laurent and all who it may concern, > > Ever since I switches to using imx7-media-csi on imx8mq I have seen a > bug that hangs /freezes the system so that I can't really save a trace > or get logs for it. It happens not every time when starting streaming, > but sometimes - when starting to stream frames. > > It kind of looks like a lock not released or something similar, but > some race condition might happen since it's happening every 2 to 10 > times. > > For me, when it fails, it fails the first time when starting to stream > after rebooting. If it succeeds that first time, it continues to > succeed, until I reboot. When I read your description I was immediately reminded to this post on NXP forums [1]. I do not know if this is what is happening to you, but it sounds somewhat similar. There is also an errata in post [2] describing some backgrounds. Later posts also describe that apparently only CSI port 1 is affected, but CSI port 2 is not. Do you have the possibility to test CSI port 2? Best regards, Alexander [1] https://community.nxp.com/t5/i-MX-Processors/IMX8MQ-MIPI-CSI2-Base-address-switching-change-error/m-p/1218063 [2] https://community.nxp.com/t5/i-MX-Processors/IMX8MQ-MIPI-CSI2-Base-address-switching-change-error/m-p/1216509/highlight/true#M167970
