Re: Diagnosing ACPI trouble related to pinctr_cherryview on 4.4.x

[Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>]

On Tue, Mar 22, 2016 at 05:49:50PM +0200, Mika Westerberg wrote:
> On Tue, Mar 22, 2016 at 11:41:38AM -0400, Martin Langhoff wrote:
> > On Tue, Mar 22, 2016 at 11:22 AM, Mika Westerberg
> > <mika.westerberg@xxxxxxxxxxxxxxx> wrote:
> > > I think this is a known issue.
> > >
> > > Please disable dw_dmac from your .config (or blacklist the module):
> > >
> > >   CONFIG_DW_DMAC_CORE=n
> > >   CONFIG_DW_DMAC=n
> > >
> > > You can also enable pinctrl-cherryview.c.
> > 
> > Thanks for the suggestion. Did not complete boot however, got a
> > slightly different call trace, but still no go. As that trace crossed
> > _prepare_cpus I tried adding nosmp, but we still crash in
> > acpi_init->acpi_scan_init->acpi_bus_scan->acpi_bus_attach
> > 
> > Any other suggestion? lspci normal and verbose follow...
> 
> Do you have anything special on the kernel command line? You should not
> do anything else than disable DW_DMAC. That is enough to prevent the
> DMA hang if that's the issue.
> 
> Are you able to get dmesg of the crash?

Also I can see that the LPSS devices are in PCI mode for some reason.
BTW, what laptop this is?
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