linux-kernel - Re: [PATCH] i2c: designware: use enable on resume instead initialization

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Date:	Wed, 24 Jun 2015 09:36:43 +0200
From:	christian.ruppert@...tech.com
To:	Lucas De Marchi <lucas.de.marchi@...il.com>
Cc:	Christian Ruppert <christian.ruppert@...lis.com>,
	Fabio Mello <fabio.mello@...el.com>,
	Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
	linux-i2c@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>,
	Lucas De Marchi <lucas.demarchi@...el.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Wolfram Sang <wsa@...-dreams.de>
Subject: Re: [PATCH] i2c: designware: use enable on resume instead initialization

Dear Lucas,

Lucas De Marchi <lucas.de.marchi@...il.com> wrote on 23.06.2015 19:02:03:
> On Tue, Jun 23, 2015 at 1:45 PM,  <christian.ruppert@...tech.com> wrote:
> > Hello,
> >
> > Christian Ruppert/ALi_GVA/ALi wrote on 10.06.2015 17:05:16:
> [...]
> > The result is not very encouraging: Out of five (identical) designware 
i2c
> > controllers we have on my test SOC, the first one initialises properly 
but
> > the second one gets stuck in the famous irq loop right away when the
> > module is enabled in i2c_dw_init. The system never gets around to try
> 
> Are you using the pci or platform driver?  I noticed yesterday the pci
> version is failing here with a NULL pointer dereference.

The test was performed with the platform driver (instantiated through 
device tree).
I just re-checked and the ultimate problem which hangs/kills the system in 
my case is the IRQ loop.
I haven't observed any NULL pointer dereferences on the road.

Greetings,
  Christian

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