RE: iMX6 PCIe gen 2 card compatibility

RE: iMX6 PCIe gen 2 card compatibility

[Richard.Zhu]

No, it's not common for all gen2 cards.
I used the xhci(one, pcie2usb3.0) ep device, this device works well on gen2 speed.

Best Regards
Richard Zhu
Linux BSP team

> -----Original Message-----
> From: Tord Andersson [mailto:tord.andersson@endian.se]
> Sent: Tuesday, March 10, 2015 12:25 AM
> To: linux-pci@vger.kernel.org
> Cc: Zhu Richard-R65037; l.stach@pengutronix.de; bhelgaas@google.com;
> Estevam Fabio-R49496
> Subject: iMX6 PCIe gen 2 card compatibility
> 
> I have done some tests on a PCIe gen 2 based USB3380 card on an IMX6Q-
> based reference board using the latest mainline kernel with the
> associated net2280 driver.
> The only way, at the moment to make it work is to force gen 1 link
> speed.
> Is this common for all gen 2 cards?
> Are there fixes or patches available that will make it possible to
> reenable gen 2?
> I wonder if this problem might be caused by iMX6 errata ERR005184 -
> "PCIe: Clock pointers can lose sync during clock rate changes"?
> 
> BR,
> 
> Tord