Re: [PATCH v2] mtd: rawnand: marvell: check for RDY bits after enabling the IRQ

[Boris Brezillon <boris.brezillon@xxxxxxxxxxx>]

On Mon, 1 Oct 2018 22:34:38 +0200
Boris Brezillon <boris.brezillon@xxxxxxxxxxx> wrote:
  
> > 
> > I'd previously tried readl() based on the same hunch. No change.
> > 
> > I think my snippet above might be misleading. While a delay between 
> > readl_relaxed() and the if should not change the outcome, this is also a 
> > delay between marvell_nfc_enable_int() and marvell_nfc_disable_int() 
> > which is probably more significant. Sure enough if I move the delay to 
> > just before the marvell_nfc_disable_int() the error is not seen.  
> 
> AFAICT, your timeout always happens when waiting for RDREQ, not RDYM.
> So maybe disabling MRDY too early has a side-effect on the RDREQ event.

Can you try with this patch [1]? It should ensure that NDSR_RDY bits
are cleared before starting an operation.

[1]http://code.bulix.org/lgs30c-468205

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