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

[Ramneek Mehresh]

> -----Original Message-----
> From: Marek Vasut [mailto:marex at denx.de]
> Sent: Tuesday, April 07, 2015 7:22 PM
> To: Mehresh Ramneek-B31383
> Cc: u-boot; sr at denx.de
> Subject: Re: Regarding patch: http://patchwork.ozlabs.org/patch/373593/
> 
> 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.
> 
Hi Marek, it's not USB controller stop, it's Phy stop which is not supported.
Controller stopping is supported. 

> Best regards,
> Marek Vasut