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Write not working in framebuffer on which mipi oled connects

Question asked by Kunal Kulshrestha on May 3, 2017
Latest reply on May 4, 2017 by Kunal Kulshrestha

Dear Team,


While trying to interface Oled over Mipi DSI in iMX6DL board, I could see the driver code being executed because it is showing stable backlight now when it executes SLEEP_OUT command. So after it comes out of sleep, I try to write something to framebuffer.

But, to my surprise, I am not able to write anything to framebuffer. ie. I used this command:

dd if=/dev/urandom of=/dev/fb0 bs=3200 count=400

and was expecting some pixels to change color etc. but nothing changes. I also used a cross compiled app to write to fb0 on which mipi_dsi is supposed to have been interfaced. I am not sure whether I need to do some more changes in driver to make sure fb connects to the oled.

Anybody faced such kind of issues or with any clues will help me.


Thanks and regards,