Re: [RFC PATCH] acpi/arm64: ignore 5.1 FADTs that are reported as 5.0

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On Thu, 20 Jun 2019, Lorenzo Pieralisi wrote:

> On Thu, Jun 20, 2019 at 08:57:32AM +0100, Lee Jones wrote:
> > On Wed, 19 Jun 2019, Sudeep Holla wrote:
> > 
> > > On Wed, Jun 19, 2019 at 02:18:31PM +0200, Ard Biesheuvel wrote:
> > > > Some Qualcomm Snapdragon based laptops built to run Microsoft Windows
> > > > are clearly ACPI 5.1 based, given that that is the first ACPI revision
> > > > that supports ARM, and introduced the FADT 'arm_boot_flags' field,
> > > > which has a non-zero field on those systems.
> > > > 
> > > > So in these cases, infer from the ARM boot flags that the FADT must be
> > > > 5.1 or later, and treat it as 5.1.
> > > > 
> > > 
> > > Makes sense and looks simple to me.
> > > 
> > > Acked-by: Sudeep Holla <sudeep.holla@xxxxxxx>
> > 
> > Could we pleeeeease have this in for v5.3?
> > 
> > We have available, consumer-level platforms that rely on this change.
> 
> But we do not have the kernel infrastructure to support them so
> I am fine with it but urgency is questionable as far as I am
> concerned.

Yes we do.  At least, we will in v5.3.

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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