Disabling DRAM Self-Refresh (partially) on Linux

Right now I am trying to disable the self-refresh of DRAM. Nice would be the possibility to disable it during runtime with some kind of kernel module.

What I have found so far:

Partial Array Self Refresh (PASR): A special mode where specific banks can be disabled. [www.micron.com] this paper is giving a more detailed explanation.

This kind of DRAM is used, e.g., on the raspberry pi. Is there any option to control that function?

I also have found this article: [lwn.net] It is describing some kind of framework, but I do not understand if it is usable and how. Does someone maybe have some code to try?

I also searched in the Linux kernel source code for PASR and had some findings. The most interesting one I think is this one:

drivers/memory/emif.h:338:#define PASR_MASK (0x7 << 24)
The problem is that this variable does not appear somewhere else. So there is no possibility to change it at runtime.

Thank you in advance!

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