Rockchip DMC issue [ Rock 5B ]

I am trying the latest bsp kernel version 6.1.84, on Rock 5B, but dmc failed to probe, and I don’t know why.
Can someone spot what I’m missing?

*Rock 5B log:
rock@rock5b:~$ dmesg|grep dmc

[ 7.597518] rockchip-dmc dmc: bin=0
[ 7.597704] rockchip-dmc dmc: leakage=50
[ 7.597719] rockchip-dmc dmc: leakage-volt-sel=2
[ 7.597732] rockchip-dmc dmc: soc version=0, speed=2
[ 7.597768] rockchip-dmc dmc: Looking up center-supply from device tree
[ 7.598038] rockchip-dmc dmc: Looking up mem-supply from device tree
[ 7.599133] rockchip-dmc dmc: avs=0
[ 7.599152] rockchip-dmc dmc: current ATF version 0x100
[ 7.599347] rockchip-dmc dmc: there is no available frequencies!
[ 7.599358] rockchip-dmc dmc: cannot get frequency info
[ 7.599366] rockchip-dmc: probe of dmc failed with error -1

*Rock 5C log:
rock@rock5c:~$ dmesg|grep dmc

[ 11.641242] rockchip-dmc dmc: bin=0
[ 11.641426] rockchip-dmc dmc: leakage=58
[ 11.641469] rockchip-dmc dmc: leakage-volt-sel=3
[ 11.641475] rockchip-dmc dmc: soc version=0, speed=3
[ 11.641493] rockchip-dmc dmc: Looking up center-supply from device tree
[ 11.641636] rockchip-dmc dmc: Looking up mem-supply from device tree
[ 11.642545] rockchip-dmc dmc: avs=0
[ 11.642553] rockchip-dmc dmc: current ATF version 0x100
[ 11.642720] rockchip-dmc dmc: normal_rate = 1560000000
[ 11.642725] rockchip-dmc dmc: reboot_rate = 2112000000
[ 11.642728] rockchip-dmc dmc: suspend_rate = 528000000
[ 11.642732] rockchip-dmc dmc: video_4k_rate = 1560000000
[ 11.642735] rockchip-dmc dmc: video_4k_10b_rate = 1560000000
[ 11.642739] rockchip-dmc dmc: video_svep_rate = 1560000000
[ 11.642743] rockchip-dmc dmc: boost_rate = 2112000000
[ 11.642746] rockchip-dmc dmc: fixed_rate(isp|cif0|cif1|dualview) = 2112000000
[ 11.642750] rockchip-dmc dmc: performance_rate = 2112000000
[ 11.642754] rockchip-dmc dmc: hdmirx_rate = 2112000000
[ 11.642758] rockchip-dmc dmc: deep_suspend_rate = 2112000000
[ 11.642763] rockchip-dmc dmc: failed to get vop bandwidth to dmc rate
[ 11.642766] rockchip-dmc dmc: failed to get vop pn to msch rl
[ 11.642996] rockchip-dmc dmc: l=10000 h=2147483647 hyst=5000 l_limit=0 h_limit=0 h_table=0

It turned out to be a DRAM initialization/freq issue. The board was a pre-sales and can’t work with latest u-boot/rkbin. Downgraded and it’s now stable.