Re: [RFC/RFT PATCH] mmc: renesas_sdhi: add delay between tuning cmds

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On Fri, Jun 16, 2023 at 9:39 AM Biju Das <biju.das.jz@xxxxxxxxxxxxxx> wrote:
>
> Hi Adam,
>
> > -----Original Message-----
> > From: Adam Ford <aford173@xxxxxxxxx>
> > Sent: Friday, June 16, 2023 3:35 PM
> > To: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>; Adam Ford
> > <aford173@xxxxxxxxx>; linux-mmc@xxxxxxxxxxxxxxx; linux-renesas-
> > soc@xxxxxxxxxxxxxxx; Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
> > Subject: Re: [RFC/RFT PATCH] mmc: renesas_sdhi: add delay between tuning
> > cmds
> >
> > On Wed, May 31, 2023 at 12:45 PM Wolfram Sang <wsa+renesas@sang-
> > engineering.com> wrote:
> > >
> > >
> > > > I am testing this on a 5.10 kernel based on the Renesas RZ linux
> > > > kernel branch.  The good news is that the card doesn't hang like it
> > > > used to on the older 4.19 kernel, but it still does not enumerate to
> > > > SDR104 speeds.
> > >
> > > U-Boot has a 1ms delay. Could you increase the delay to 1ms, please?
> >
> > Sorry for the delay, but I increased this to  usleep_range(1000, 2500) and
> > it still hangs.
> >
> > I don't know if the issue is dependent on the variant.  For what it's
> > worth, I am testing an RZ/G2M, but I can do the same thing on an RZ/G2N or
> > RZ/G2H if you want.
>
> I am doing 6.1.y testing[1] with all RZ board variants,
> [1] https://git.kernel.org/pub/scm/linux/kernel/git/cip/linux-cip.git/log/?h=linux-6.1.y-cip
>
> I have done SDHI testing with RZ/G2M 1.3 HiHope board and I didn't face this issue.
>
> Can you please let me know how to reproduce this issue?

It's not easy to reproduce, and it only happens on a small subset of
cards.  I sent one to Wolfram sometime last year.  I can also  take
these same cards that hang when booting Linux, and they enumerate just
fine in U-Boot at SRD104 speeds.  I can use the same RZ/G2 board with
other cards, and other cards work fine.  I then tested these same
'failing' cards on other platforms and they work fine, so it seems
like there is a tuning combination in Linux that is different from
U-Boot that is unique to these certain cards which prevents them from
working.

adam


>
> Cheers,
> Biju




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