Re: [REGRESSION] PCI v5.5-rc1 breaks google kevin

[Andrew Murray]

On Thu, Dec 12, 2019 at 12:12:56AM +0000, Robin Murphy wrote:
> Hi Vicente,
> 
> On 2019-12-11 11:38 pm, Vicente Bergas wrote:
> > Hi,
> > since v5.5-rc1 the google kevin chromebook does not boot.
> > Git bisect reports 5e0c21c75e8c PCI/ASPM: Remove pcie_aspm_enabled()
> > unnecessary locking
> > as the first bad commit.
> > 
> > In order to revert it from v5.5-rc1 i had to also revert some dependencies:
> > 5e0c21c75e8c08375a69710527e4a921b897cb7e
> > aff5d0552da4055da3faa27ee4252e48bb1f5821
> > 35efea32b26f9aacc99bf07e0d2cdfba2028b099
> > 687aaf386aeb551130f31705ce40d1341047a936
> > 72ea91afbfb08619696ccde610ee4d0d29cf4a1d
> > 87e90283c94c76ee11d379ab5a0973382bbd0baf
> > After reverting all of this, still no luck.
> > So, either the results of git bisect are not to be trusted, or
> > there are more bad commits.
> > 
> > By "does not boot" i mean that the display fails to start and
> > the display is the only output device, so debugging is quite difficult.
> 
> Assuming it's a manifestation of the same PCI breakage that Enric and
> Lorenzo figured out, there's a proposed fix here:
> https://lkml.org/lkml/2019/12/11/199

It's likely that any PCI driver that uses PCI IO with that controller will
suffer the same fate.

Vicente - can you try the patch that has been proposed and verify it fixes
the issue for you?

Thanks,

Andrew Murray

> 
> Robin.
> 
> > v5.5-rc1 as is (reverting no commits at all) works fine when disabling PCI:
> > # CONFIG_PCI is not set
> > 
> > Regards,
> >   Vicente.
> > 
> > 
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