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We were getting far off values on resume for the RX_CAL_DQS values.
This saves and restores the values for suspend/resume until the root
of the problem is figured out
Signed-off-by: Derek Basehore <dbasehore@chromium.org>

So far, there are more and more features are supported on the RK3399,
meanwhile, these features are increasingly being defined and intertwined.
It's time to clean up and make them clearer.
Signed-off-by: Xing Zheng <zhengxing@rock-chips.com>

This renames dram.c and dram.h to dfs.c and dfs.h respectively. This
is to make room for common functionality between frequency scaling and
suspend code for the DRAM in a pair of common files named dram.c and
dram.h. It also removes a duplicate enum definition from
dram_spec_timing.h

Change-Id: Ibfa1041f8781401f9d27901fe8c61862bcb05562
Signed-off-by: Derek Basehore <dbasehore@chromium.org>
Signed-off-by: Caesar Wang <wxt@rock-chips.com>

for compatible 32bit and 64bit, we use 0x82xxxxxx as function ID,
we modify SIP call function return value to 32 bit.

Change-Id: Ib99b03a9ea423853aaa296dcc634ee82c622a552

add auto_pd_dis_freq parameter, we can pass a frequency from kernel
to disable or enable ddr auto power down function.

Change-Id: Ie30914701336c59047c380381c6b75dd76a89562

add dram driver, and kernel can through sip function talk to bl31 to
do ddr frequency scaling. and ddr auto powerdown.

Change-Id: I0d0f2869aed95e336c6e23ba96a9310985c84840