On Thu, Jan 10, 2019 at 02:26:22PM +0200, Baruch Siach wrote:
> Commit 3d71746c42 ("PCI: armada8k: Add support for gpio controlled reset
> signal") added reset signal support. Reset is unconditionally asserted
> and deasserted.
>
> Unfortunately, that commit breaks boot on Macchiatobin when a Mellanox
> NIC is in the PCIe slot.
>
> It turns out that you can toggle the reset signal only once. Another
> reset signal toggle makes access to PCI configuration registers stall
> indefinitely. U-Boot toggles the Macchiatobin PCIe reset line already at
> boot.
Hi Baruch
Is this double reset issue limited to just Mellanox NICs, or any
device in the PCIe slot?
This sounds more like a workaround than a fix. It would be good to
investigate further and determine which end of the PCIe link has the
problem.
Thanks
Andrew
