Re: pxa3xx-nand failing to find device on linux-next

[Boris Brezillon]

Le Wed, 24 May 2017 22:58:53 +0000,
Chris Packham <Chris.Packham@xxxxxxxxxxxxxxxxxxx> a Ãcrit :

> On 25/05/17 10:36, Boris Brezillon wrote:
> > Le Wed, 24 May 2017 22:03:52 +0000,
> > Chris Packham <Chris.Packham@xxxxxxxxxxxxxxxxxxx> a Ãcrit :
> >   
> >> On 24/05/17 23:25, Boris Brezillon wrote:  
> >>> On Wed, 24 May 2017 13:23:01 +0200
> >>> Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx> wrote:
> >>>      
> >>>> Hi Chris,
> >>>>
> >>>> On Wed, 24 May 2017 09:36:56 +0000
> >>>> Chris Packham <Chris.Packham@xxxxxxxxxxxxxxxxxxx> wrote:
> >>>>     
> >>>>> On 23/05/17 17:27, Chris Packham wrote:  
> >>>>>> Hi,
> >>>>>>
> >>>>>> I'm doing some testing on linux-next and I'm finding that my nand flash
> >>>>>> has disappeared.
> >>>>>>
> >>>>>> pxa3xx-nand f10d0000.flash: This platform can't do DMA on this device
> >>>>>> pxa3xx-nand f10d0000.flash: non-supported command ef
> >>>>>> pxa3xx-nand f10d0000.flash: non-supported command ee
> >>>>>> pxa3xx-nand f10d0000.flash: non-supported command ef
> >>>>>> pxa3xx-nand f10d0000.flash: non-supported command ee
> >>>>>> On-die ECC forcefully enabled, not supported
> >>>>>> nand: No NAND device found
> >>>>>> pxa3xx-nand f10d0000.flash: failed to scan nand at cs 0
> >>>>>>
> >>>>>> This was working around 4.11. I'll try to do some more digging tomorrow
> >>>>>> to narrow down a failure point but I thought I'd send this out now just
> >>>>>> in case it rings any bells.
> >>>>>>
> >>>>>> The board I'm using (DB-88F6820-AMC) is unfortunately out-of tree but it
> >>>>>> should be pretty close to the armada-388-db. I can make my dts available
> >>>>>> if it's helpful.  
> >>>>>
> >>>>> Still works on 4.12-rc2. Fails on next-20170524.
> >>>>>
> >>>>> This appears to be due to commit b566d9c055de ("mtd: nand: add support
> >>>>> for Micron on-die ECC"). Which based on the description seems intentional.
> >>>>>
> >>>>> Since I have access to a hardware platform that has a micron flash with
> >>>>> ECC forcefully enabled how can I help to get this implemented.  
> >>>>
> >>>> Can you try with this patch applied [1]?  
> >>>
> >>> Sorry, wrong patch. Can you try this one [1] instead?
> >>>
> >>> [1]http://code.bulix.org/pkfhmi-135875
> >>>      
> >>
> >> With the patch above the chip is detected but ubifs is unhappy  
> > 
> > Hm, weird. And if you revert my both Thomas patch and mine, what do you
> > get?  
> 
> Seems to work just fine.

Okay. Let's try with something simpler then. Can you test the following
patch?

--->8---