From mboxrd@z Thu Jan  1 00:00:00 1970
From: jbe@pengutronix.de (Juergen Borleis)
Date: Thu, 26 Jun 2014 11:26:09 +0200
Subject: [RFC] PCI: pci-imx6: Add delay to workaround kernel hang
In-Reply-To: <201406261117.12542.marex@denx.de>
References: <1403637507-9424-1-git-send-email-festevam@gmail.com>
 <201406260932.30524.jbe@pengutronix.de> <201406261117.12542.marex@denx.de>
Message-ID: <201406261126.09235.jbe@pengutronix.de>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

Hi Marek,

On Thursday 26 June 2014 11:17:12 Marek Vasut wrote:
> On Thursday, June 26, 2014 at 09:32:30 AM, Juergen Borleis wrote:
> > On Thursday 26 June 2014 05:43:19 Fabio Estevam wrote:
> > > [...]
> > >
> > > Below is the log with linux-next kernel and earlyprintk enabled:
> >
> > Does it also hang when you disable "earlyprintk"? A few weeks ago we had
> > a similar issue with i.MX6/PCI and "earlyprintk" (at the end it was
> > caused by a clock change for the UART when changing from the early to the
> > regular console).
>
> How can the UART clock have impact on the PCIe please ?

Not to the PCIe hardware, it just hanged the kernel when the PCIe driver came 
up (due to some of its messages it tries to output at this moment).

jbe

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