linux-kernel - Re: [PATCH] ACPI: SPCR: Add new 16550-compatible Serial Port Subtype

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Message-ID: <CAPv3WKf=ufj-RbqOKm3cjOQcG1PDAEAkVLdLQUkRK94=_vtj9w@mail.gmail.com>
Date:   Fri, 25 Jun 2021 19:18:06 +0200
From:   Marcin Wojtas <mw@...ihalf.com>
To:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        devel@...ica.org
Cc:     Grzegorz Jaszczyk <jaz@...ihalf.com>,
        Grzegorz Bernacki <gjb@...ihalf.com>, upstream@...ihalf.com,
        Samer El-Haj-Mahmoud <Samer.El-Haj-Mahmoud@....com>,
        Jon Nettleton <jon@...id-run.com>,
        Tomasz Nowicki <tn@...ihalf.com>, rjw@...ysocki.net,
        lenb@...nel.org, erik.kaneda@...el.com, robert.moore@...el.com,
        Marcin Wojtas <mw@...ihalf.com>
Subject: Re: [PATCH] ACPI: SPCR: Add new 16550-compatible Serial Port Subtype

Hi,

pon., 21 cze 2021 o 22:06 Marcin Wojtas <mw@...ihalf.com> napisał(a):
>
> Apologies for the patch prefix, of course it's a first version and
> unrelated to the networking subsystem.
>
> Best regards,
> Marcin
>
>
> pon., 21 cze 2021 o 22:05 Marcin Wojtas <mw@...ihalf.com> napisał(a):
> >
> > The Microsoft Debug Port Table 2 (DBG2) specification revision
> > May 31, 2017 adds support for 16550-compatible Serial Port
> > Subtype with parameters defined in Generic Address Structure (GAS) [1]
> >
> > Add its support in SPCR parsing routine.
> >
> > [1] https://docs.microsoft.com/en-us/windows-hardware/drivers/bringup/acpi-debug-port-table
> >
> > Signed-off-by: Marcin Wojtas <mw@...ihalf.com>
> > ---
> >  include/acpi/actbl1.h | 1 +
> >  drivers/acpi/spcr.c   | 1 +
> >  2 files changed, 2 insertions(+)
> >
> > diff --git a/include/acpi/actbl1.h b/include/acpi/actbl1.h
> > index ce59903c2695..f746012eba8d 100644
> > --- a/include/acpi/actbl1.h
> > +++ b/include/acpi/actbl1.h
> > @@ -498,6 +498,7 @@ struct acpi_dbg2_device {
> >  #define ACPI_DBG2_ARM_SBSA_GENERIC  0x000E
> >  #define ACPI_DBG2_ARM_DCC           0x000F
> >  #define ACPI_DBG2_BCM2835           0x0010
> > +#define ACPI_DBG2_16550_WITH_GAS    0x0012
> >
> >  #define ACPI_DBG2_1394_STANDARD     0x0000
> >
> > diff --git a/drivers/acpi/spcr.c b/drivers/acpi/spcr.c
> > index 88460bacd5ae..25c2d0be953e 100644
> > --- a/drivers/acpi/spcr.c
> > +++ b/drivers/acpi/spcr.c
> > @@ -136,6 +136,7 @@ int __init acpi_parse_spcr(bool enable_earlycon, bool enable_console)
> >                 break;
> >         case ACPI_DBG2_16550_COMPATIBLE:
> >         case ACPI_DBG2_16550_SUBSET:
> > +       case ACPI_DBG2_16550_WITH_GAS:
> >                 uart = "uart";
> >                 break;
> >         default:
> > --

Do you have any comments / remarks to the patch?

Best regards,
Marcin