linux-kernel - Re: [PATCH v2] mtd: nand: pxa3xx-nand: prevent DFI bus lockup on removal

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Message-ID: <20150928000515.GA34421@google.com>
Date:	Sun, 27 Sep 2015 17:05:15 -0700
From:	Brian Norris <computersforpeace@...il.com>
To:	Robert Jarzmik <robert.jarzmik@...e.fr>
Cc:	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	David Woodhouse <dwmw2@...radead.org>,
	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] mtd: nand: pxa3xx-nand: prevent DFI bus lockup on
 removal

On Sat, Sep 26, 2015 at 10:19:07PM +0200, Robert Jarzmik wrote:
> Robert Jarzmik <robert.jarzmik@...e.fr> writes:
> 
> > After the conversion of pxa architecture to common clock framework, the
> > NAND clock can be disabled on driver exit.
> >
> > In this case, it happens that if the driver used the NAND and set the
> > DFI arbitration bit, the next access to a static memory controller area,
> > such as an ethernet card, will stall the system bus, and the core will
> > be stalled forever.
> >
> > This is especially true on pxa31x SoCs, where the NDCR was augmented
> > with a new bit to prevent this lockups by giving full ownership of the
> > DFI arbiter to the SMC, in change SCr#6.
> >
> > Fix this by clearing the DFI arbritration bit in driver exit. This
> > effectively prevents a lockup on zylonite when removing pxa3xx-nand
> > module, and using ethernet afterwards.
> >
> > Signed-off-by: Robert Jarzmik <robert.jarzmik@...e.fr>
> Hi Brian,
> 
> Are you happy with this patch, and if so could you queue it please ?

It looks OK to me, but it doesn't apply to the latest l2-mtd.git. Am I
missing something? I didn't try too hard to work out the conflict
myself.

Brian
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