Re: [Qemu-devel] [PATCH v3 3/8] hw/arm/virt-acpi-build: Add power button device in ACPI DSDT table

[Shannon Zhao]

Hi Igor,

On 2015/12/1 19:41, Igor Mammedov wrote:
> On Mon, 16 Nov 2015 21:23:04 +0800
> address@hidden wrote:
> 
>> > From: Shannon Zhao <address@hidden>
>> > 
>> > Add power button device in ACPI DSDT table.
>> > 
>> > Signed-off-by: Shannon Zhao <address@hidden>
>> > Signed-off-by: Shannon Zhao <address@hidden>
>> > Reviewed-by: Wei Huang <address@hidden>
>> > Tested-by: Wei Huang <address@hidden>
>> > ---
>> >  hw/arm/virt-acpi-build.c | 13 +++++++++++++
>> >  1 file changed, 13 insertions(+)
>> > 
>> > diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
>> > index bf6b934..b25c90b 100644
>> > --- a/hw/arm/virt-acpi-build.c
>> > +++ b/hw/arm/virt-acpi-build.c
>> > @@ -340,6 +340,18 @@ static void acpi_dsdt_add_gpio(Aml *scope, const 
>> > MemMapEntry *gpio_memmap,
>> >      aml_append(scope, dev);
>> >  }
>> >  
>> > +static void acpi_dsdt_add_power_button(Aml *scope)
>> > +{
>> > +    Aml *dev = aml_device("PWRB");
>> > +    aml_append(dev, aml_name_decl("_HID", aml_string("PNP0C0C")));
>> > +    aml_append(dev, aml_name_decl("_ADR", aml_int(0)));
>> > +    aml_append(dev, aml_name_decl("_UID", aml_int(0)));
>> > +    Aml *method = aml_method("_STA", 0);
>> > +    aml_append(method, aml_return(aml_int(0x0F)));
>> > +    aml_append(dev, method);
> since _STA always returns 0xF you can just drop it altogether,
> as _STA == 0xF is implied if it's not present.
> 

Yes, but I think adding this is harmless and make the return value explicit.

Thanks,
-- 
Shannon