[PATCH] ARM: dts: imx6qdl-hummingboard: Add PCIe support

Jon Nettleton jon.nettleton at gmail.com
Wed May 6 04:04:59 PDT 2015

On Wed, May 6, 2015 at 12:35 PM, Russell King - ARM Linux
<linux at arm.linux.org.uk> wrote:
> On Mon, Apr 27, 2015 at 04:51:57PM +0800, Shawn Guo wrote:
> > On Wed, Apr 08, 2015 at 09:41:53PM -0300, Fabio Estevam wrote:
> > > From: Fabio Estevam <fabio.estevam at freescale.com>
> > >
> > > Add PCIe support. Based on a patch from Rabeeh Khoury from the solid-run
> > > tree.
> > >
> > > Signed-off-by: Fabio Estevam <fabio.estevam at freescale.com>
> >
> > Russell,
> >
> > Are you fine with this patch?
> I don't have a view on this because I don't have any experience of PCIe.
> However, I don't see anything obviously wrong with the patch.

That patch is fine.  In the SolidRun kernel we are actually using
0x80000000 as our pin strength to accept the default value, but I have
previously tested with 0x1b0b1 and it works as expected.

I have not tested this with the upstream kernel but previously MSI was
not working properly on the iMX6 pcie implementation.  This was worked
around by either disabling the kernel config option, or add pci=nomsi
to the kernel commandline.  I currently have a patch that takes a
nomsi device-tree option to workaround this bug.

Is pcie working with MSI now on the iMX6 hardware?


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