[PATCH] ARM: imx: don't abort MMDC probe if power saving status doesn't match

[Lucas Stach]

Am Mittwoch, den 29.11.2017, 22:06 +0800 schrieb Shawn Guo:
> On Mon, Nov 27, 2017 at 01:11:39PM +0100, Lucas Stach wrote:
> > The power saving status bit will not signal if the MMDC is under
> > load,
> > which is likely during kernel boot.
> 
> What is exactly the condition of MMDC is under load?  If it's likely
> hit during kernel boot, why have we not heard any report regarding to
> it before?

There were reports of this before:
https://patchwork.kernel.org/patch/9289077/

Maybe nobody really cared about the issue before, as nothing bad
happened on this check failing. But with the MMDC perf support getting
skipped now, this is rather unfortunate.

I do hit this condition pretty reliably with a recent kernel. Also I
would say it's expected that the MMDC is loaded with memory
transactions during system boot.

Regards,
Lucas