[PATCH v2] mtd: rawnand: add default values for dynamic timings

[miquel.raynal@xxxxxxxxxxx (Miquel Raynal)]

> On Sat, 14 Jul 2018 12:23:54 +0200
> Miquel Raynal <miquel.raynal at bootlin.com> wrote:
> 
> > Some timings like tBERS (block erase time), tCCs (change column setup
> > time), tPROG (page program time) and tR (page read time) are derived
> > from the ONFI parameter page. They are set in the SDR interface only
> > if the chip is ONFI compliant.
> > 
> > It makes these timings unreliable and prevent the driver to use one of
> > these four values with a non-ONFI chip.
> > 
> > Fix this situation by taking the highest possible value (or a default
> > one) value for each missing timing (stored as unsigned 16-bit entries in
> > the parameter page).
> > 
> > This makes tBERS and tPROG being ~65ms while typical values are at most
> > a few milliseconds. As these are timeouts, it is not impacting at all
> > the performances in nominal use.
> > 
> > tR maximum time and tCCS minimum time (delay to wait after a change
> > column) are set, according to the ONFI specification, to default 'slow'
> > values; respectively 200us and 500ns.
> > 
> > Signed-off-by: Miquel Raynal <miquel.raynal at bootlin.com>  
> 
> Reviewed-by: Boris Brezillon <boris.brezillon at bootlin.com>
> 

Applied to nand/next.

Miqu?l