[Macchiato] PCIe graphics card not detected

[Baruch Siach]

Hi Sumit,

Sumit Semwal writes:
> On Mon, 19 Nov 2018 at 19:26, Baruch Siach <baruch at tkos.co.il> wrote:
>> On Mon, Nov 12, 2018 at 09:07:04PM +0530, Sumit Semwal wrote:
>> > On Fri, 5 Oct 2018 at 12:41, Sumit Semwal <sumit.semwal at linaro.org> wrote:
>> > > I am running the mcbin single shot with latest debian and 4.19-rc7; my
>> > > problem is that the zotac gt710 graphics card seems to refuse to start
>> > > up - at boot, I get this:
>> > >
>> > > [    2.727091] armada8k-pcie f2600000.pcie: Phy link never came up
>> > > [    2.733053] armada8k-pcie f2600000.pcie: Link not up after reconfiguration
>> > >
>> > > and lspci only shows the marvell controller, nothing else.
>> > >
>> > > Any help is highly appreciated!
>>
>> Please try the patch linked below:
>>
>>   http://patchwork.ozlabs.org/patch/978285/
>>
>> This should release the reset signal, unless your bootloader did that already.
>
> Thanks for the pointer; with this patch, the above warnings are gone.
> But lspci shows nothing at all now. I think the zotac is working ok,
> but I will probably have to find another CPU to put in there and test.
>
> Any other leads will be super appreciated!

It turns out that this patch actually kills the PCIe host driver on
Macchiatobin entirely. That's why the warnings were gone. The reason is
that the reset gpio in the DT is wrong. This patch should fix it:

  https://patchwork.kernel.org/patch/10721129/

But I still could not get a Mellanox Ethernet PCIe card to work on the
Macchiatobin with the latest kernel. The dw_pcie_read() routine in the
PCIe driver hangs after a few successful reads. The same hardware works
with kernel v4.18 though. So you can try going back to that version.

I'll try to bisect this issue later.

baruch

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