Messages in this thread | | | Date | Mon, 28 Sep 2015 17:34:44 -0700 | From | Brian Norris <> | Subject | Re: [PATCH v2 REBASED] mtd: nand: pxa3xx-nand: prevent DFI bus lockup on removal |
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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.
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