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

[Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>]

On Tue, 2016-03-22 at 17:22 +0200, Mika Westerberg wrote:
> On Tue, Mar 22, 2016 at 11:09:51AM -0400, Martin Langhoff wrote:
> > 
> >    Hi pinctrl_cherryview maintainers.
> >    I unsuspectingly bought a laptop for a family member which hits
> > trouble
> >    with pinctrl_cherryview; it only boots with the module
> > blacklisted or
> >    acpi=off .
> >    System is (trying) to run Fedora 23 -- made more difficult by
> > recent
> >    Fedora kernels having the module built-in.
> >    Are there any useful debugging steps I can follow to narrow this
> > down?
> >    Already tried the acpi diagnostics steps (acpi=ht, etc) to no
> > avail.
> >    thank you!
> 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.
> 
> Andy (Cc'd) is working a fix for this DMA hang issue.

The issue Mika pointed out is described in the kernel bugzilla:

https://bugzilla.kernel.org/show_bug.cgi?id=101271

However it might be not the same issue.


-- 
Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Intel Finland Oy

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