Change in coreboot[master]: soc/rockchip/rk3399/sdram: Clear PI_175 IRQs in data training

[Moritz Fischer (Code Review)]

Attention is currently required from: Angel Pons, Julius Werner.
Moritz Fischer has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/50886 )

Change subject: soc/rockchip/rk3399/sdram: Clear PI_175 IRQs in data training
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Patch Set 1:

(1 comment)

Commit Message:

https://review.coreboot.org/c/coreboot/+/50886/comment/d24b3a39_dbbe2cae 
PS1, Line 10: calls.
> I have no experience with ARM, but I like RAM stuff. […]

I don't have the vendor spec. I'm basically porting from U-Boot. Their LPDDR4 works, coreboot one doesn't. The code there was mostly written / reviewed by rockchip people.

They started out as the same driver (U-Boot copied coreboot's driver).

All I have are the commit messages there. If you have a better way of doing this, I'm open to discuss :)