[PATCH u-boot-marvell] PLEASE TEST ddr: marvell: a38x: fix SPLIT_OUT_MIX state decision

[Marek Behun]

On Mon, 8 Feb 2021 20:14:26 +0000
Chris Packham <Chris.Packham at alliedtelesis.co.nz> wrote:

> On 9/02/21 8:15 am, Marek Behun wrote:
> > This patch is needed on some Turris Omnia boards with Samsung DDR chips,
> > otherwise DDR training fails in ~60% of cases.
> >
> > Marvell send us this patch for testing, I have updated it a little.
> >
> > Please test this on other A38x boards.
> >
> > If it doesn't break anything on other boards, we can apply it and send
> > it to mv-ddr-marvell upstream.  
> They gave us the same patch. I was hoping their SoC team would get it 
> into mv-ddr-marvell (or even their vendor USP) but obviously they're 
> still sitting on it. I know it improved matters for some of our boards 
> but it didn't totally fix them we still had yield problems when we 
> ramped up production.

There is a bug in the version they sent us:

in file ddr3_training_ip_engine.c there is a line added:
   if ((bit_bit_mask[sybphy_id] & (1 << bit_id)) == 1)

try chaning it to
   if (bit_bit_mask[sybphy_id] & (1 << bit_id))

This is fixed in the version I sent to mailing list