pcie-aardvark GEN2 link speed 2.5 GT/s instead of 5.0 GT/s

pcie-aardvark GEN2 link speed 2.5 GT/s instead of 5.0 GT/s

[Marek Behún]

Hello,
for our testing purposes we are trying various PCIe cards on our Armada
3720 board, but for some reason we cannot link the device at 5.0 GT/s.
The board should support PCIe GEN 2, and when given an ASM1062 MiniPCIe
SATA card, lspci -vvv prints:
   LnkCap:	Port #1, Speed 5GT/s, Width x1, ...
but
   LnkSta:	Speed 2.5GT/s, Width x1, ...

Is it possible to train the link with pcie-aardvark to 5.0GT/s?
Thank you.

Marek Behun

Re: pcie-aardvark GEN2 link speed 2.5 GT/s instead of 5.0 GT/s

[Thomas Petazzoni]

Hello,

+Victor Gu in Cc.

On Tue, 3 Jul 2018 17:00:59 +0200, Marek Beh=C3=BAn wrote:

> for our testing purposes we are trying various PCIe cards on our Armada
> 3720 board, but for some reason we cannot link the device at 5.0 GT/s.
> The board should support PCIe GEN 2, and when given an ASM1062 MiniPCIe
> SATA card, lspci -vvv prints:
>    LnkCap:	Port #1, Speed 5GT/s, Width x1, ...
> but
>    LnkSta:	Speed 2.5GT/s, Width x1, ...
>=20
> Is it possible to train the link with pcie-aardvark to 5.0GT/s?

I would need to do some research to be able to answer, but as a quick
reply, I would like to suggest to try the following patch series:

  https://patchwork.ozlabs.org/project/linux-pci/list/?series=3D52819

Could you let us know if it helps or not ?

Best regards,

Thomas
--=20
Thomas Petazzoni, CTO, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com