Re: [PATCHv2 3/3] serial: 8250_dw: Add quirk for APM X-Gene SoC (was: BT / serial regression introduced during the recent 4.9-rc1 merge?)

[Heikki Krogerus <heikki.krogerus@linux.intel.com>]

On Wed, Nov 02, 2016 at 02:52:12PM +0100, Jérôme de Bretagne wrote:
> Hi again,
> 
> > > Heikki, I don't think anything depends on this commit, is that correct?
> > 
> > Unfortunately we can't fix the values for every UART that has ACPI
> > companion like we did before anymore.
> > 
> > There is at least one new platform, that the driver supports, which
> > does not have the Designware UART in this "16550 compatible" mode, and
> > I guess it's possible that there are others as well. And I guess the
> > other values can also be what ever on those platforms.
> > 
> > Jérôme, can you test if using the quirk on Baytrails works:
> > 
> > @@ -302,7 +302,8 @@ static void dw8250_quirks(struct uart_port *p, struct
> > dw8250_data *data)
> >  
> >                 id = acpi_match_device(p->dev->driver->acpi_match_table,
> >                                        p->dev);
> > -               if (id && !strcmp(id->id, "APMC0D08")) {
> > +               if (id && (!strcmp(id->id, "APMC0D08") ||
> > +                   !strcmp(id->id, "80860F0A"))) {
> >                         p->iotype = UPIO_MEM32;
> >                         p->regshift = 2;
> >                         p->serial_in = dw8250_serial_in32;
> 
> Compilation finished with that small modification applied: Bluetooth works
> indeed in that case and I don't have the error messages in dmesg anymore.
> 
> > 
> > Please note that this really is not a fix, not even a temporary one
> > for this issue. There are a lot of Baytrails on the market. I just
> > want to make sure there really is a problem delivering those values as
> > device properties with your board.
> 
> I guess this confirms there is indeed a problem delivering those values as
> devices properties on that specific Baytrail device at least.

I can reproduce this now with a Thinkpad10 we have.


Cheers,

-- 
heikki