[U-Boot] Regarding patch: http://patchwork.ozlabs.org/patch/373593/

[Marek Vasut]

On Tuesday, April 07, 2015 at 08:18:03 AM, Ramneek Mehresh wrote:

[...]

> > Hi,
> > 
> > Is this similar hardware bug to the one which MX6 PCIe is suffering ? On
> > MX6, the bug is that you cannot reset the PCIe and PCIe PHY from
> > software, which means that if you start PCIe in U-Boot, you cannot
> > reliably use it in Linux. Furthermore, if you reset the MX6 via WDT, you
> > cannot start PCIe reliably in Linux even if PCIe is not used in U-Boot
> > at all.
> > 
> > Is this the same type of hardware screwup where the design team didn't
> > think reset was necessary?
> 
> I have raised request for this feature in up-coming socs, and they have
> agreed to provide phy shut-down in future revs. However, this support is
> not available in current revs for which the code is sent. What do you
> suggest we should do for current socs?

Hi,

I don't know, but doesn't leaving the USB running cause trouble to Linux?
I think you should at least document the reasoning why the USB stop is not
implemented for this broken hardware.

Best regards,
Marek Vasut