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

Robert Jarzmik
2015-09-26T20:24:13Z

Robert Jarzmik <robert.jarzmik@free.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@free.fr>
Hi Brian,

Are you happy with this patch, and if so could you queue it please ?

Cheers.

--
Robert