Re: [PATCH v4 12/13] acpi: drop serial/parallel enable bits from dsdt

[Igor Mammedov <imammedo@redhat.com>]

On Tue,  5 May 2020 13:38:42 +0200
Gerd Hoffmann <kraxel@redhat.com> wrote:

> The _STA methods for COM+LPT used to reference them,
> but that isn't the case any more.
> 
> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> ---
>  hw/i386/acpi-build.c | 23 -----------------------
>  1 file changed, 23 deletions(-)
> 
> diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> index 1922868f3401..765409a90eb6 100644
> --- a/hw/i386/acpi-build.c
> +++ b/hw/i386/acpi-build.c
> @@ -1437,15 +1437,6 @@ static void build_q35_isa_bridge(Aml *table)
>      aml_append(field, aml_named_field("LPTD", 2));
                                          ^^^^
not related to this patch but it seems that above&co are also unused fields.
it was this way in Seabios and probably even earlier wherever it was copied from.

>      aml_append(dev, field);
>  
> -    aml_append(dev, aml_operation_region("LPCE", AML_PCI_CONFIG,
> -                                         aml_int(0x82), 0x02));
> -    /* enable bits */
> -    field = aml_field("LPCE", AML_ANY_ACC, AML_NOLOCK, AML_PRESERVE);
> -    aml_append(field, aml_named_field("CAEN", 1));
> -    aml_append(field, aml_named_field("CBEN", 1));
> -    aml_append(field, aml_named_field("LPEN", 1));
> -    aml_append(dev, field);
> -
>      aml_append(scope, dev);
>      aml_append(table, scope);
>  }
> @@ -1469,7 +1460,6 @@ static void build_piix4_isa_bridge(Aml *table)
>  {
>      Aml *dev;
>      Aml *scope;
> -    Aml *field;
>  
>      scope =  aml_scope("_SB.PCI0");
>      dev = aml_device("ISA");
> @@ -1478,19 +1468,6 @@ static void build_piix4_isa_bridge(Aml *table)
>      /* PIIX PCI to ISA irq remapping */
>      aml_append(dev, aml_operation_region("P40C", AML_PCI_CONFIG,
>                                           aml_int(0x60), 0x04));
> -    /* enable bits */
> -    field = aml_field("^PX13.P13C", AML_ANY_ACC, AML_NOLOCK, AML_PRESERVE);
                                ^^^ should we drop this as well as it becomes unused?

> -    /* Offset(0x5f),, 7, */
> -    aml_append(field, aml_reserved_field(0x2f8));
> -    aml_append(field, aml_reserved_field(7));
> -    aml_append(field, aml_named_field("LPEN", 1));
> -    /* Offset(0x67),, 3, */
> -    aml_append(field, aml_reserved_field(0x38));
> -    aml_append(field, aml_reserved_field(3));
> -    aml_append(field, aml_named_field("CAEN", 1));
> -    aml_append(field, aml_reserved_field(3));
> -    aml_append(field, aml_named_field("CBEN", 1));
> -    aml_append(dev, field);
>  
>      aml_append(scope, dev);
>      aml_append(table, scope);