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From: Marek Vasut <marex@denx.de>
To: Juergen Borleis <jbe@pengutronix.de>
Subject: Re: [RFC] PCI: pci-imx6: Add delay to workaround kernel hang
Date: Thu, 26 Jun 2014 11:17:12 +0200
Cc: Fabio Estevam <festevam@gmail.com>,
	Shawn Guo <shawn.guo@freescale.com>,
	Bjorn Helgaas <bhelgaas@google.com>,
	Richard Zhu <r65037@freescale.com>,
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	Tim Harvey <tharvey@gateworks.com>,
	Fabio Estevam <fabio.estevam@freescale.com>
References: <1403637507-9424-1-git-send-email-festevam@gmail.com> <CAOMZO5A0pQfJRwb41046UpkbG6xH7c+EVu+YuY71Zuyq5gHaDA@mail.gmail.com> <201406260932.30524.jbe@pengutronix.de>
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On Thursday, June 26, 2014 at 09:32:30 AM, Juergen Borleis wrote:
> Hi Fabio,
> 
> 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 ?

Best regards,
Marek Vasut

From mboxrd@z Thu Jan  1 00:00:00 1970
From: marex@denx.de (Marek Vasut)
Date: Thu, 26 Jun 2014 11:17:12 +0200
Subject: [RFC] PCI: pci-imx6: Add delay to workaround kernel hang
In-Reply-To: <201406260932.30524.jbe@pengutronix.de>
References: <1403637507-9424-1-git-send-email-festevam@gmail.com>
 <CAOMZO5A0pQfJRwb41046UpkbG6xH7c+EVu+YuY71Zuyq5gHaDA@mail.gmail.com>
 <201406260932.30524.jbe@pengutronix.de>
Message-ID: <201406261117.12542.marex@denx.de>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Thursday, June 26, 2014 at 09:32:30 AM, Juergen Borleis wrote:
> Hi Fabio,
> 
> 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 ?

Best regards,
Marek Vasut