Re: [PATCH 16/17] mtd: rawnand: cafe: Handle non-32bit aligned reads/writes

[Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>]

On Mon, 27 Apr 2020 22:04:59 +0200
Miquel Raynal <miquel.raynal@xxxxxxxxxxx> wrote:

> Hi Boris,
> 
> Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx> wrote on Mon, 27 Apr
> 2020 10:20:26 +0200:
> 
> > The spec says the write/read buffers should be filled/read 32bits at a
> > time. While most of the time the reads/writes are aligned on 4 bytes,
> > we should make the implementation more robust to non-usual NAND
> > operations.  
> 
> Well, if I didn't get confused by the previous changes, I think these
> are used by ->exec_op() and at boot time there are 2B (ID), 3B (I
> don't remember) and 5B (full ID) accesses that are performed. These are
> not 32-bit aligned.

Oh, you're right. Looks like read_byte() does single byte accesses
already, meaning that readb is allowed on the MMIO region. I'll just
drop this patch then.

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