* Thomas Zimmermann <tzimmermann@xxxxxxx> [240220 10:42]: > The changes below look good. You can test by instrumenting > drm_fb_helper_deferred_io() with printk(). For testing, you can reduce the > write-back frequency by setting helper->fbdefio.delay to a higher value. If > you set it to HZ, it should only do a write-back once per second. Then do an > mmap() from userspace and copy data into the memory region. It should print > something from drm_fb_helper_deferred_io(). Best regards Thomas OK thanks I tested with fbtest.c I found [0] with some trace_printk added and it works nicely :) Will post v2 set of patches. Regards, Tony [0] https://gist.github.com/rafalrusin/1482697
