On Fri, 19 Mar 2021 08:08:34 +0000,
Marcin Wojtas [off-list ref] wrote:

HI Gregory,

pt., 19 mar 2021 o 08:35 Gregory CLEMENT [off-list ref]
napisał(a):

quoted

Hello Marcin,

quoted

[Resend in plain text]

Hi,

Just letting everyone know - merging only the DT part of this patchset
broke AHCI on all Marvell Armada 7k8k / CN913x platforms in v5.11
release.

It's unfortunate that we didn't know this when v5.11-rc1 was
released. However it is still time for a fix, I will submit it.
As I explained in the other email when I applied this I really though
that the driver part will be applied, I don't know what happened here.

Sure, looking at the thread it looks more of a communication issue. I
am also surprised the breakage went unnoticed for a while (unless
everyone is using edk2, like myself :) ). I think it would be good to
revert the change on top of v5.11.x. The drivers adoption would have to
land before v5.12 though, so that not to repeat the problem during next release.

Small rant:
A general issue with the DT binding changes of this kind (previously
clocks, ICU, etc.) that I have, is a side effect of incompatibility
with older kernels/other OSs. The latter must follow the
modifications, but you can forget of booting e.g. Debian Buster with
the ToT device tree. Therefore in edk2 I do not update the device tree
fork to often and need to tweak it in order to have the widest support
coverage.

Unfortunately, this has been the case for this machine since it became
available. I can happily boot any kernel on other systems of the same
vintage without touching anything firmware related, which is crucial
to identify regressions.

The A8k requires instead a per-kernel DT, something that only works if
you treat it as an embedded system, and not a standard system (which
is why mine has been collecting dust for some time now). I don't think
the maintainers have ever been interested in solving this problem.

As for ACPI, that'd probably be the best thing that can happen to this
platform. Not sure that's remotely possible though, given how
"interesting" the HW is.

	M.

-- 
Without deviation from the norm, progress is not possible.

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel