Re: [PATCH] i386:acpi: Remove _HID from the SMBus ACPI entry

["Michael S. Tsirkin" <mst@redhat.com>]

On Tue, Jan 07, 2020 at 02:11:06PM -0600, Corey Minyard wrote:
> On Tue, Jan 07, 2020 at 05:58:21PM +0100, Igor Mammedov wrote:
> > On Mon,  6 Jan 2020 09:27:05 -0600
> > minyard@acm.org wrote:
> > 
> > > From: Corey Minyard <cminyard@mvista.com>
> > > 
> > > Per the ACPI spec (version 6.1, section 6.1.5 _HID) it is not required
> > > on enumerated buses (like PCI in this case), _ADR is required (and is
> > > already there).  And the _HID value is wrong.  Linux appears to ignore
> > > the _HID entry, but it confuses Windows.
> > 
> > Corey,
> > 
> > Could you clarify as what "confuses Windows" means?
> > s/confuses Windows/description of the observed problem and on what windows version/
> 
> Yeah, I should have done that.  The error is not given, but the report
> says" "It is detected by Windows 10 as 'Unknown Device' and there is no
> driver available."  Link is https://bugs.launchpad.net/qemu/+bug/1856724
> 
> I'll add that to the text, along with the link.
> 
> -corey


ok so you will repost with igor's ack and tweaked commit log?

> > 
> > > 
> > > Signed-off-by: Corey Minyard <cminyard@mvista.com>
> > > Cc: Michael S. Tsirkin <mst@redhat.com>
> > > Cc: Igor Mammedov <imammedo@redhat.com>
> > > ---
> > >  hw/i386/acpi-build.c | 1 -
> > >  1 file changed, 1 deletion(-)
> > > 
> > > diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> > > index 7b8da62d41..ab73a8f4c8 100644
> > > --- a/hw/i386/acpi-build.c
> > > +++ b/hw/i386/acpi-build.c
> > > @@ -1815,7 +1815,6 @@ static void build_smb0(Aml *table, I2CBus *smbus, int devnr, int func)
> > >      Aml *scope = aml_scope("_SB.PCI0");
> > >      Aml *dev = aml_device("SMB0");
> > >  
> > > -    aml_append(dev, aml_name_decl("_HID", aml_eisaid("APP0005")));
> > >      aml_append(dev, aml_name_decl("_ADR", aml_int(devnr << 16 | func)));
> > >      build_acpi_ipmi_devices(dev, BUS(smbus), "\\_SB.PCI0.SMB0");
> > >      aml_append(scope, dev);
> >