In imx6 Reference manual(IMX6DQRM.pdf), it say that
Power saving features should be disabled before the calibration
How to distinguish between DDR3 calibration and power saving feature?
I think, in normal operation, it must enable auto ZQ calibration,
Upon hardware or software self-refresh request assertion,
Disable ZQ calibration first, and enable auto power saving.
Is it correct?
In our customer, when both calibration and automatic power saving are
enable, their LCD output will stop and system will hung-up.
Which mechanism do it happen?