Signature check for display for the IMX8QXP

[Ashil]

Hi,

I had a requirement to do CRC or signature check for a specific area of image to be displayed how can I do this in on IMX8QXP for Linux. Any susggestions.

[joanxie]

got suggestion as below

"The DPU signature is used in DRM standard CRC function.

Userspace can control generation of CRCs in a given CRTC by writing to the file /sys/kernel/debug/dri/0/crtc-N/crc/control in debugfs, with N being the index of the CRTC. Accepted values are source names (which are driver-specific) and the "auto" keyword, which will let the driver select a default source of frame CRCs for this CRTC.

Once frame CRC generation is enabled, userspace can capture them by reading the /sys/kernel/debug/dri/0/crtc-N/crc/data file."