linux-kernel - Re: [RFC PATCH 00/14] Support timezone of ACPI TAD and EFI TIME

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Message-ID: <3476450.BMEcId2Lgj@vostro.rjw.lan>
Date:	Fri, 20 Dec 2013 23:18:56 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Matt Fleming <matt@...sole-pimps.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>, joeyli <jlee@...e.com>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Matthew Garrett <matthew.garrett@...ula.com>, Elliott@...com,
	samer.el-haj-mahmoud@...com, Oliver Neukum <oneukum@...e.de>,
	werner@...e.com, trenn@...e.de, JBeulich@...e.com,
	linux-kernel@...r.kernel.org, rtc-linux@...glegroups.com,
	x86@...nel.org,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	linux-acpi@...r.kernel.org, Borislav Petkov <bp@...e.de>
Subject: Re: [RFC PATCH 00/14] Support timezone of ACPI TAD and EFI TIME

On Friday, December 20, 2013 09:50:56 PM Matt Fleming wrote:
> On Fri, 20 Dec, at 01:43:38PM, H. Peter Anvin wrote:
> > 
> > Possibly... will have to investigate.  I would also ask if the same
> > applies to the PNP0B0x devices -- all we really need there is the
> > presence/absence indication and the I/O port base.
> 
> It's worth noting that efi_late_init() exists solely because the ACPI
> infrastructure to find the BGRT table isn't available any earlier.
> 
> If we could setup ACPI earlier that would be awesome.

I'm not sure 100%, but I *think* we need to do that with interrupts enabled.
At least after mm_init(), because it relies on things initialized there if I
remember correctly.

>From what I can tell at the moment, it might be possible to move it before
efi_enter_virtual_mode() if that would help.

Thanks,
Rafael

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