linux-kernel - Re: [PATCH v10 3/4] ARM64: ACPI: enable ACPI_SPCR

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Message-ID: <1473352456.21193.8.camel@redhat.com>
Date:   Thu, 08 Sep 2016 12:34:16 -0400
From:   Mark Salter <msalter@...hat.com>
To:     Will Deacon <will.deacon@....com>,
        Aleksey Makarov <amakarov.linux@...il.com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Aleksey Makarov <aleksey.makarov@...aro.org>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        "Zheng, Lv" <lv.zheng@...el.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Russell King <linux@....linux.org.uk>,
        Peter Hurley <peter@...leysoftware.com>,
        Graeme Gregory <graeme.gregory@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        linux-kernel@...r.kernel.org,
        Leif Lindholm <leif.lindholm@...aro.org>,
        linux-acpi@...r.kernel.org, Yury Norov <ynorov@...iumnetworks.com>,
        Christopher Covington <cov@...eaurora.org>,
        linux-serial@...r.kernel.org, Al Stone <ahs3@...hat.com>,
        linux-arm-kernel@...ts.infradead.org, Len Brown <lenb@...nel.org>
Subject: Re: [PATCH v10 3/4] ARM64: ACPI: enable ACPI_SPCR_TABLE

On Thu, 2016-09-08 at 12:16 +0100, Will Deacon wrote:
> On Wed, Sep 07, 2016 at 12:30:19PM +0300, Aleksey Makarov wrote:
> > 
> > 
> > On 09/05/2016 03:36 PM, Aleksey Makarov wrote:
> > > 
> > > SBBR mentions SPCR as a mandatory ACPI table.  So enable it for ARM64
> > > 
> > > Earlycon should be set up as early as possible.  ACPI boot tables are
> > > mapped in arch/arm64/kernel/acpi.c:acpi_boot_table_init() that
> > > is called from setup_arch() and that's where we parse SPCR.
> > > So it has to be opted-in per-arch.
> > > 
> > > When ACPI_SPCR_TABLE is defined initialization of DT earlycon is
> > > deferred until the DT/ACPI decision is done.  Initialize DT earlycon
> > > if ACPI is disabled.
> > Hi Will, Catalin,
> > 
> > Can you review this patch and consider ACKing it please?
> Hanjun, Al, Mark, Graeme -- any comments on this?
> 
> Will

I think there is a problem still with systems using 32-bit access to 8250
UARTs (i.e. Mustang) but that will need a DBG2 table spec change and
followup patch to resolve.