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2019-02-15ddr: vybrid: Provide code to perform on-boot calibrationLukasz Majewski
This patch provides the code to calibrate the DDR's DQS to DQ signals (RDLVL). It is based on: VFxxx Controller Reference Manual, Rev. 0, 10/2016, page 1600 10.1.6.16.4.1 "Software Read Leveling in MC Evaluation Mode" and NXP's community thread: "Vybrid: About DDR leveling feature on DDRMC." https://community.nxp.com/thread/395323 Signed-off-by: Lukasz Majewski <lukma@denx.de>