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

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Message-ID: <87a8s9exxg.fsf@belgarion.home>
Date:	Sat, 26 Sep 2015 22:19:07 +0200
From:	Robert Jarzmik <robert.jarzmik@...e.fr>
To:	Brian Norris <computersforpeace@...il.com>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>
Cc:	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

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 ?

Cheers.

--
Robert
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