Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1234599

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

Show all headers | View raw

On Mon, Sep 28, 2015 at 10:56:51PM +0200, Robert Jarzmik wrote:
> 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@free.fr>
> 
> ---
> Since v1: add comment, switch to NFCV1/NCFV2 registers naming
> Since v2: rebase on top of Brian's tree

Applied to l2-mtd.git. Thanks.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Previous in thread | Find similar | Unroll thread

Thread

[PATCH v2 REBASED] mtd: nand: pxa3xx-nand: prevent DFI bus lockup on removal Robert Jarzmik <robert.jarzmik@free.fr> - 2015-09-28 23:10 +0200
  Re: [PATCH v2 REBASED] mtd: nand: pxa3xx-nand: prevent DFI bus  lockup on removal Brian Norris <computersforpeace@gmail.com> - 2015-09-29 02:40 +0200

csiph-web