On Wed, Mar 11, 2015 at 04:05:31PM +0100, Bas Vermeulen wrote:
>
> On Wed, March 11, 2015 4:01 pm, Sascha Hauer wrote:
> > On Wed, Mar 11, 2015 at 03:52:53PM +0100, Bas Vermeulen wrote:
> >> Hello,
> >>
> >> On Wed, March 11, 2015 2:51 pm, Sascha Hauer wrote:
> >> > This driver normally is not used with device tree. Without additional
> >> > kernel changes the chipidea driver is used instead.
> >>
> >> I'm just forward-porting a patch I made for 2.6.31.14 to workaround
> >> an issue we found. I'm unsure where to fit this in in the chipidea
> >> driver.
> >>
> >> However, if you read the errata for the i.mx35, you will see the problem
> >> and the fix proposed. I have been unable to find that errata for other
> >> soc's in the family (but some google fu found somewhat similar issues
> >> for
> >> i.mx25 and i.mx51).
> >>
> >> I would still like to get this patch incorporated into the ehci-mxc
> >> driver, as it might make it easier to find for people with the same
> >> problem.
> >
> > If you start your board with device tree the ehci-mxc driver will never
> > be started, because noone ever registers the device. When you start
> > without device tree (but instead with board file)
> > of_machine_is_compatible("fsl,imx35") will always return false because
> > there is no device tree. To trigger your fixup one would have to start
> > the kernel via device tree and additionally create a board file which
> > registers the ehci-mxc device. A rather unusual case.
>
> What should I use instead? I'm fine changing the patch, I'm just not sure
> what to use to make it conditional.
A question is whether it should be conditional at all. We are currently
hunting a very hard to trigger bug on the i.MX53 which could be this
one. We are testing it and Michael will can send a (tested) patch later.
However, this will probably take some weeks because as said the bugs
takes very long to trigger.
Sascha
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