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SubjectRe: [PATCH v2 3/3] i2c / ACPI: add ACPI enumeration support
On Fri, 16 Nov 2012 14:21:54 +0100, Rafael J. Wysocki wrote:
> On Friday, November 16, 2012 02:03:57 PM Jean Delvare wrote:
> > Hi Rafael,
> >
> > On Fri, 16 Nov 2012 11:09:03 +0100, Rafael J. Wysocki wrote:
> > > On Thursday, November 15, 2012 01:03:17 PM Mika Westerberg wrote:
> > > > ACPI 5 introduced I2cSerialBus resource that makes it possible to enumerate
> > > > and configure the I2C slave devices behind the I2C controller. This patch
> > > > adds helper functions to support I2C slave enumeration.
> > > >
> > > > An ACPI enabled I2C controller driver only needs to call acpi_i2c_register_devices()
> > > > in order to get its slave devices enumerated, created and bound to the
> > > > corresponding ACPI handle.
> > > >
> > > > Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
> > >
> > > Are there any objections against this patch or comments?
> > >
> > > Worfram? Jean? Ben?
> >
> > I am no longer maintaining the i2c subsystem and will not have the time
> > to look deeply into this. All I can say is that I very happy to see
> > this finally happen. Maybe with ACPI 5.0 we will finally be done with
> > resource conflicts plaguing many systems for several years now.
> >
> > I took a quick look, and the only thing which seems suspicious is this
> > function:
> >
> > > +static int acpi_i2c_find_child_address(struct acpi_resource *ares, void *data)
> > > +{
> > > + struct acpi_resource_i2c_serialbus *sb;
> > > + struct acpi_i2c_find *i2c_find = data;
> > > +
> > > + if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
> > > + return 1;
> > > +
> > > + sb = &ares->data.i2c_serial_bus;
> > > + if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_I2C)
> > > + return 1;
> > > +
> > > + if (sb->slave_address == i2c_find->addr)
> >
> > The 7-bit and 10-bit address maps overlap, so the above isn't enough.
> > You must compare the addresses _and_ sb->access_mode with
> > i2c_find->access_mode (which needs to be added and filled properly.)
> >
> > > + i2c_find->found = true;
> > > +
> > > + return 1;
> > > +}
> >
> > Plus, it seems odd that this function always returns 1.
>
> Yes, this is a bug I think. Mika?

The equivalent function for SPI devices does the same, so if this is a
bug, it must be fixed there too. If this is not a bug then it is
questionable why these functions return something in the first place.

But then again I didn't look into the design, so I may be missing
something.

--
Jean Delvare


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