Re: [PATCH] cxl: core/region - ignore interleave granularity when ways=1

[Dan Williams]

Gregory Price wrote:
> When validating decoder IW/IG when setting up regions, the granularity
> is irrelevant when iw=1 - all accesses will always route to the only
> target anyway - so all ig values are "correct". Loosen the requirement
> that `ig = (parent_iw * parent_ig)` when iw=1.

Can you say a bit more here about the real world impact like we chatted
about on Discord? Something like:

---
The platform BIOS on "platform-X" specifies a 512-byte
interleave-granularity CXL Window when 256-byte is expected. This leads
to Linux erroneously rejecting the region configuration of 2 devices
attached to an x1 host bridge.
---

That way distros and platform-X folks can flag the importance of this fix.